Create virtual keyboard using C# Winform Application

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Diagnostics; using System.Runtime.InteropServices;   namespace VirtualKeyboardDemo {     /// <summary>     /// Geovin Du 涂聚文     /// http://www.codeproject.com/KB/miscctrl/touchscreenkeyboard.aspx     /// http://blogs.microsoft.co.il/blogs/tamir/archive/2008/02/13/custom-editors-accessibility-and-attached-properties.aspx     /// http://www.codeproject.com/KB/scripting/jvk.aspx     /// http://www.dreamincode.net/forums/topic/107179-virtual-keyboard/     ///     /// </summary>     public partial class Form2 : Form     {           private const uint SWP_NOSIZE = 0x0001;         private const uint SWP_NOMOVE = 0x0002;         private const uint SWP_NOZORDER = 0x0004;         private const uint SWP_NOREDRAW = 0x0008;         private const uint SWP_NOACTIVATE = 0x0010;         private const uint SWP_FRAMECHANGED = 0x0020;         private const uint SWP_SHOWWINDOW = 0x0040;         private const uint SWP_HIDEWINDOW = 0x0080;         private const uint SWP_NOCOPYBITS = 0x0100;         private const uint SWP_NOOWNERZORDER = 0x0200;         private const uint SWP_NOSENDCHANGING = 0x0400;         private int handle;         #region SendMessage Constants           private const int WM_LBUTTONDOWN = 0x0201;         private const int WM_LBUTTONUP = 0x0202;         private const int WM_LBUTTONDBLCLK = 0x0203;         private const int WM_RBUTTONDOWN = 0x0204;         private const int WM_RBUTTONUP = 0x0205;         private const int WM_RBUTTONDBLCLK = 0x0206;         private const int WM_MOUSEMOVE = 0x0200;         private const int WM_KEYDOWN = 0x100;         private const int WM_KEYUP = 0x0101;         private const int WM_CHAR = 0x0102;         #endregion SendMessage Constants         #region API fonction         //Public Declare Function GetActiveWindow Lib "user32" Alias "GetActiveWindow" () As Long          //this function gets active window identify number == (8975651603260375040)          [System.Runtime.InteropServices.DllImport("user32", EntryPoint = "SetActiveWindow", ExactSpelling = true, CharSet = System.Runtime.InteropServices.CharSet.Ansi, SetLastError = true)]           public static extern long SetActiveWindow(long hwnd);         [System.Runtime.InteropServices.DllImport("user32", EntryPoint = "keybd_event", ExactSpelling = true, CharSet = System.Runtime.InteropServices.CharSet.Ansi, SetLastError = true)]         public static extern long keybd_event(byte bVk, byte bScan, long dwFlags, long dwExtraInfo);           #endregion         static readonly IntPtr HWND_TOPMOST = new IntPtr(-1);         static readonly IntPtr HWND_NOTOPMOST = new IntPtr(-2);         static readonly IntPtr HWND_TOP = new IntPtr(0);         const UInt32 TOPMOST_FLAGS = SWP_NOMOVE | SWP_NOSIZE;         #region Virtual Keys Constants         private const int VK_LBUTTON = 0X1; //Left mouse button.          private const int VK_RBUTTON = 0X2; //Right mouse button.          private const int VK_CANCEL = 0X3; //Used for control-break processing.          private const int VK_MBUTTON = 0X4; //''Middle mouse button (3-button mouse).          private const int KEYEVENTF_KEYUP = 0X2; // Release key          private const int VK_OEM_PERIOD = 0XBE; //.         private const int KEYEVENTF_EXTENDEDKEY = 0X1;         private const int VK_STARTKEY = 0X5B; //Start Menu key          private bool lockbool;         private bool numlockbool;         private bool ctrlbool;         private bool onoff;         private const int VK_OEM_COMMA = 0XBC; //, comma          public const int VK_0 = 0x30;         public const int VK_1 = 0x31;         public const int VK_2 = 0x32;         public const int VK_3 = 0x33;         public const int VK_4 = 0x34;         public const int VK_5 = 0x35;         public const int VK_6 = 0x36;         public const int VK_7 = 0x37;         public const int VK_8 = 0x38;         public const int VK_9 = 0x39;         public const int VK_A = 0x41;         public const int VK_B = 0x42;         public const int VK_C = 0x43;         public const int VK_D = 0x44;         public const int VK_E = 0x45;         public const int VK_F = 0x46;         public const int VK_G = 0x47;         public const int VK_H = 0x48;         public const int VK_I = 0x49;         public const int VK_J = 0x4A;         public const int VK_K = 0x4B;         public const int VK_L = 0x4C;         public const int VK_M = 0x4D;         public const int VK_N = 0x4E;         public const int VK_O = 0x4F;         public const int VK_P = 0x50;         public const int VK_Q = 0x51;         public const int VK_R = 0x52;         public const int VK_S = 0x53;         public const int VK_T = 0x54;         public const int VK_U = 0x55;         public const int VK_V = 0x56;         public const int VK_W = 0x57;         public const int VK_X = 0x58;         public const int VK_Y = 0x59;         public const int VK_Z = 0x5A;         public const int VK_BACK = 0x08;         public const int VK_TAB = 0x09;         public const int VK_CLEAR = 0x0C;         public const int VK_RETURN = 0x0D;         public const int VK_SHIFT = 0x10;         public const int VK_CONTROL = 0x11;         public const int VK_MENU = 0x12;         public const int VK_PAUSE = 0x13;         public const int VK_CAPITAL = 0x14;         public const int VK_KANA = 0x15;         public const int VK_HANGEUL = 0x15;         public const int VK_HANGUL = 0x15;         public const int VK_JUNJA = 0x17;         public const int VK_FINAL = 0x18;         public const int VK_HANJA = 0x19;         public const int VK_KANJI = 0x19;         public const int VK_ESCAPE = 0x1B;         public const int VK_CONVERT = 0x1C;         public const int VK_NONCONVERT = 0x1D;         public const int VK_ACCEPT = 0x1E;         public const int VK_MODECHANGE = 0x1F;         public const int VK_SPACE = 0x20;         public const int VK_PRIOR = 0x21;         public const int VK_NEXT = 0x22;         public const int VK_END = 0x23;         public const int VK_HOME = 0x24;         public const int VK_LEFT = 0x25;         public const int VK_UP = 0x26;         public const int VK_RIGHT = 0x27;         public const int VK_DOWN = 0x28;         public const int VK_SELECT = 0x29;         public const int VK_PRINT = 0x2A;         public const int VK_EXECUTE = 0x2B;         public const int VK_SNAPSHOT = 0x2C;         public const int VK_INSERT = 0x2D;         public const int VK_DELETE = 0x2E;         public const int VK_HELP = 0x2F;         public const int VK_LWIN = 0x5B;         public const int VK_RWIN = 0x5C;         public const int VK_APPS = 0x5D;         public const int VK_SLEEP = 0x5F;         public const int VK_NUMPAD0 = 0x60;         public const int VK_NUMPAD1 = 0x61;         public const int VK_NUMPAD2 = 0x62;         public const int VK_NUMPAD3 = 0x63;         public const int VK_NUMPAD4 = 0x64;         public const int VK_NUMPAD5 = 0x65;         public const int VK_NUMPAD6 = 0x66;         public const int VK_NUMPAD7 = 0x67;         public const int VK_NUMPAD8 = 0x68;         public const int VK_NUMPAD9 = 0x69;         public const int VK_MULTIPLY = 0x6A;         public const int VK_ADD = 0x6B;         public const int VK_SEPARATOR = 0x6C;         public const int VK_SUBTRACT = 0x6D;         public const int VK_DECIMAL = 0x6E;         public const int VK_DIVIDE = 0x6F;         public const int VK_F1 = 0x70;         public const int VK_F2 = 0x71;         public const int VK_F3 = 0x72;         public const int VK_F4 = 0x73;         public const int VK_F5 = 0x74;         public const int VK_F6 = 0x75;         public const int VK_F7 = 0x76;         public const int VK_F8 = 0x77;         public const int VK_F9 = 0x78;         public const int VK_F10 = 0x79;         public const int VK_F11 = 0x7A;         public const int VK_F12 = 0x7B;         public const int VK_F13 = 0x7C;         public const int VK_F14 = 0x7D;         public const int VK_F15 = 0x7E;         public const int VK_F16 = 0x7F;         public const int VK_F17 = 0x80;         public const int VK_F18 = 0x81;         public const int VK_F19 = 0x82;         public const int VK_F20 = 0x83;         public const int VK_F21 = 0x84;         public const int VK_F22 = 0x85;         public const int VK_F23 = 0x86;         public const int VK_F24 = 0x87;         public const int VK_NUMLOCK = 0x90;         public const int VK_SCROLL = 0x91;         #endregion Virtual Keys Constants           [DllImport("user32.dll")]         public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);         [DllImport("user32.dll")]         static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X,int Y, int cx, int cy, uint uFlags);         [DllImport("user32.dll")]         static extern bool SetForegroundWindow(IntPtr hWnd);         [DllImport("user32.dll", CharSet = CharSet.Auto)]         private static extern int SendMessage(int hWnd, int msg, int wParam, IntPtr lParam);         [DllImport("user32.dll", CharSet = CharSet.Auto)] // used for button-down & button-up          private static extern int PostMessage(int hWnd, int msg, int wParam, IntPtr lParam);         [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]         public static extern IntPtr SetFocus(IntPtr hWnd);              public Form2()         {             InitializeComponent();         }         private void Form2_Load(object sender, EventArgs e)         {           }         private void button1_Click(object sender, EventArgs e)         {             //Cursor.Position = new Point(5,763);             try             {                 Button key = (Button)sender;                 whichbuttonpushed(key.Name);                 SetActiveWindow(8975651603260375040); //This Line Very Impportant              }             catch (Exception ex)             {                 MessageBox.Show(ex.Message, "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1);                 return;             }             finally             {                 SetActiveWindow(8975651603260375040);             }          }            public void SetFocus()          {                SetForegroundWindow(new IntPtr(this.handle));            }          public void SendLeftButtonDown(int x, int y)      {            PostMessage(handle, WM_LBUTTONDOWN, 0, new IntPtr(y * 0x10000 + x));        }         public void SendLeftButtonUp(int x, int y)      {          PostMessage(handle, WM_LBUTTONUP, 0, new IntPtr(y * 0x10000 + x));        }       public void SendLeftButtondblclick(int x, int y)      {          PostMessage(handle, WM_LBUTTONDBLCLK, 0, new IntPtr(y * 0x10000 + x));       }          public void SendRightButtonDown(int x, int y)      {            PostMessage(handle, WM_RBUTTONDOWN, 0, new IntPtr(y * 0x10000 + x));        }      public void SendRightButtonUp(int x, int y)      {          PostMessage(handle, WM_RBUTTONUP, 0, new IntPtr(y * 0x10000 + x));        }      public void SendRightButtondblclick(int x, int y)      {           PostMessage(handle, WM_RBUTTONDBLCLK, 0, new IntPtr(y * 0x10000 + x));        }      public void SendMouseMove(int x, int y)      {          PostMessage(handle, WM_MOUSEMOVE, 0, new IntPtr(y * 0x10000 + x));        }     public void SendKeyDown(int key)      {          PostMessage(handle, WM_KEYDOWN, key, IntPtr.Zero);      }     public void SendKeyUp(int key)      {            PostMessage(handle, WM_KEYUP, key, new IntPtr(1));        }      public void SendChar(char c)      {            SendMessage(handle, WM_CHAR, c, IntPtr.Zero);      }         public void SendString(string s)      {            foreach (char c in s) SendChar(c);      }               // forcus          public void MouseMoved(object sender, MouseEventArgs e)         {              label1.Text = String.Format("x={0} y={1}", e.X, e.Y);                     }           private void pictureBox1_Click(object sender, EventArgs e)         {             label1.Text = "You Clicked on this button";             SendKeys.Send("{CAPSLOCK}");           }         private void Form1_Activated(object sender, EventArgs e)         {               SendKeys.Send("{CAPSLOCK}");         }         // end          // function key          #region which button pushed function         //INSTANT C# NOTE: These were formerly VB static local variables:         private int screenshot_i;         public string whichbuttonpushed(string _sender)         {             try             {                 SetActiveWindow(8975651603260375040); //Set focus Active window                  //I found this number("8975651603260375040") via getactivewindow method.                  switch (_sender)                 {                     case "btna":                         keybd_event(VK_A, 0, 0, 0);                         keybd_event(VK_A, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnb":                         keybd_event(VK_B, 0, 0, 0);                         keybd_event(VK_B, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnc":                         keybd_event(VK_C, 0, 0, 0);                         keybd_event(VK_C, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btn_c":                         keybd_event(VK_C, 0, 0, 0);                         keybd_event(VK_C, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnd":                         keybd_event(VK_D, 0, 0, 0);                         keybd_event(VK_D, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btne":                         keybd_event(VK_E, 0, 0, 0);                         keybd_event(VK_E, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnf":                         keybd_event(VK_F, 0, 0, 0);                         keybd_event(VK_F, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btng":                         keybd_event(VK_G, 0, 0, 0);                         keybd_event(VK_G, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btn_g":                         keybd_event(VK_G, 0, 0, 0);                         keybd_event(VK_G, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnh":                         keybd_event(VK_H, 0, 0, 0);                         keybd_event(VK_H, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btn_i":                         keybd_event(VK_I, 0, 0, 0);                         keybd_event(VK_I, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btni":                         keybd_event(VK_I, 0, 0, 0);                         keybd_event(VK_I, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnj":                         keybd_event(VK_J, 0, 0, 0);                         keybd_event(VK_J, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnk":                         keybd_event(VK_K, 0, 0, 0);                         keybd_event(VK_K, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnl":                         keybd_event(VK_L, 0, 0, 0);                         keybd_event(VK_L, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnm":                         keybd_event(VK_M, 0, 0, 0);                         keybd_event(VK_M, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnn":                         keybd_event(VK_N, 0, 0, 0);                         keybd_event(VK_N, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btno":                         keybd_event(VK_O, 0, 0, 0);                         keybd_event(VK_O, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btn_o":                         keybd_event(VK_O, 0, 0, 0);                         keybd_event(VK_O, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnp":                         keybd_event(VK_P, 0, 0, 0);                         keybd_event(VK_P, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnr":                         keybd_event(VK_R, 0, 0, 0);                         keybd_event(VK_R, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btns":                         keybd_event(VK_S, 0, 0, 0);                         keybd_event(VK_S, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btn_s":                         keybd_event(VK_S, 0, 0, 0);                         keybd_event(VK_S, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnt":                         keybd_event(VK_T, 0, 0, 0);                         keybd_event(VK_T, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnu":                         keybd_event(VK_U, 0, 0, 0);                         keybd_event(VK_U, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btn_u":                         keybd_event(VK_U, 0, 0, 0);                         keybd_event(VK_U, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnv":                         keybd_event(VK_V, 0, 0, 0);                         keybd_event(VK_V, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btny":                         keybd_event(VK_Y, 0, 0, 0);                         keybd_event(VK_Y, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnz":                         keybd_event(VK_Z, 0, 0, 0);                         keybd_event(VK_Z, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnw":                         keybd_event(VK_W, 0, 0, 0);                         keybd_event(VK_W, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnq":                         keybd_event(VK_Q, 0, 0, 0);                         keybd_event(VK_Q, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnx":                         keybd_event(VK_X, 0, 0, 0);                         keybd_event(VK_X, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         //***************************************************************************************                          break;                     case "btnnokta": //"."                          keybd_event(VK_OEM_PERIOD, 0, 0, 0);                         keybd_event(VK_OEM_PERIOD, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnesc":                         keybd_event(VK_ESCAPE, 0, 0, 0);                         keybd_event(VK_ESCAPE, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnf1":                         keybd_event(VK_F1, 0, 0, 0);                         keybd_event(VK_F1, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnf2":                         keybd_event(VK_F2, 0, 0, 0);                         keybd_event(VK_F2, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnf3":                         keybd_event(VK_F3, 0, 0, 0);                         keybd_event(VK_F3, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                                                break;                     case "btnf4":                         keybd_event(VK_F4, 0, 0, 0);                         keybd_event(VK_F4, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnf5":                         keybd_event(VK_F5, 0, 0, 0);                         keybd_event(VK_F5, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnf6":                         keybd_event(VK_F6, 0, 0, 0);                         keybd_event(VK_F6, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnf7":                         keybd_event(VK_F7, 0, 0, 0);                         keybd_event(VK_F7, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btnf8":                         keybd_event(VK_F8, 0, 0, 0);                         keybd_event(VK_F8, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                     case "btn9":                         keybd_event(VK_9, 0, 0, 0);                         keybd_event(VK_9, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btncarpi": // *                //                           keybd_event(VK_MULTIPLY, 0, 0, 0);                         keybd_event(VK_MULTIPLY, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                     case "btneksi": // -                          keybd_event(VK_SUBTRACT, 0, 0, 0);                         keybd_event(VK_SUBTRACT, 0, KEYEVENTF_KEYUP, 0);                         shiftrelease();                         altrelease();                         leftaltrelease();                         break;                   }                 return null;             }             catch (Exception ex)             {                 return null;             }             //INSTANT C# NOTE: Inserted the following 'return' since all code paths must return a value in C#:             return null;         }           #endregion         // alt                   #region shift ,altgr and alt release sub         public void shiftrelease()         {             btnsolshift.BackColor = Color.FromArgb(224, 224, 224);             btnsagshift.BackColor = Color.FromArgb(224, 224, 224);             keybd_event(VK_SHIFT, 0, 2, 0);         }         public void altrelease()         {             keybd_event(VK_MENU, 0, KEYEVENTF_EXTENDEDKEY | 2, 0);             btnsagaltgr.BackColor = Color.FromArgb(224, 224, 224);         }         public void leftaltrelease()         {             keybd_event(VK_MENU, 0, KEYEVENTF_KEYUP, 0);             btnsolalt.BackColor = Color.FromArgb(224, 224, 224);         }         #endregion         // numlock         #region numlock function         public string numlockfunc(string numlock_tus, bool open_close)         {             try             {                 if (open_close == false) //numlock opened                  {                     switch (numlock_tus)                     {                         case "btnnumlockbolu":                             keybd_event(VK_DIVIDE, 0, 0, 0);                             keybd_event(VK_DIVIDE, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlockcarpi":                             keybd_event(VK_MULTIPLY, 0, 0, 0);                             keybd_event(VK_MULTIPLY, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlockeksi":                             keybd_event(VK_SUBTRACT, 0, 0, 0);                             keybd_event(VK_SUBTRACT, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlockarti":                             keybd_event(VK_ADD, 0, 0, 0);                             keybd_event(VK_ADD, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlockenter":                             keybd_event(VK_RETURN, 0, 0, 0);                             keybd_event(VK_RETURN, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlocknokta":                             keybd_event(VK_DECIMAL, 0, 0, 0);                             keybd_event(VK_DECIMAL, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlock0":                             keybd_event(VK_NUMPAD0, 0, 0, 0);                             keybd_event(VK_NUMPAD0, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlock1":                             keybd_event(VK_NUMPAD1, 0, 0, 0);                             keybd_event(VK_NUMPAD1, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlock2":                             keybd_event(VK_NUMPAD2, 0, 0, 0);                             keybd_event(VK_NUMPAD2, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlock3":                             keybd_event(VK_NUMPAD3, 0, 0, 0);                             keybd_event(VK_NUMPAD3, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlock4":                             keybd_event(VK_NUMPAD4, 0, 0, 0);                             keybd_event(VK_NUMPAD4, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlock5":                             keybd_event(VK_NUMPAD5, 0, 0, 0);                             keybd_event(VK_NUMPAD5, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlock6":                             keybd_event(VK_NUMPAD6, 0, 0, 0);                             keybd_event(VK_NUMPAD6, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlock7":                             keybd_event(VK_NUMPAD7, 0, 0, 0);                             keybd_event(VK_NUMPAD7, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlock8":                             keybd_event(VK_NUMPAD8, 0, 0, 0);                             keybd_event(VK_NUMPAD8, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlock9":                             keybd_event(VK_NUMPAD9, 0, 0, 0);                             keybd_event(VK_NUMPAD9, 0, KEYEVENTF_KEYUP, 0);                             break;                     }                 }                 else //numlock closed                  {                     switch (numlock_tus)                     {                         case "btnnumlockbolu":                             keybd_event(VK_DIVIDE, 0, 0, 0);                             keybd_event(VK_DIVIDE, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlockcarpi":                             keybd_event(VK_MULTIPLY, 0, 0, 0);                             keybd_event(VK_MULTIPLY, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlockeksi":                             keybd_event(VK_SUBTRACT, 0, 0, 0);                             keybd_event(VK_SUBTRACT, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlockarti":                             keybd_event(VK_ADD, 0, 0, 0);                             keybd_event(VK_ADD, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlockenter":                             keybd_event(VK_RETURN, 0, 0, 0);                             keybd_event(VK_RETURN, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlocknokta":                             keybd_event(VK_DELETE, 0, 0, 0);                             keybd_event(VK_DELETE, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlock0":                             keybd_event(VK_INSERT, 0, 0, 0);                             keybd_event(VK_INSERT, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlock1":                             keybd_event(VK_END, 0, 0, 0);                             keybd_event(VK_END, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlock2":                             keybd_event(VK_DOWN, 0, 0, 0);                             keybd_event(VK_DOWN, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlock3":                             keybd_event(VK_NEXT, 0, 0, 0);                             keybd_event(VK_NEXT, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlock4":                             keybd_event(VK_LEFT, 0, 0, 0);                             keybd_event(VK_LEFT, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlock5":                             break;                         case "btnnumlock6":                             keybd_event(VK_RIGHT, 0, 0, 0);                             keybd_event(VK_RIGHT, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlock7":                             keybd_event(VK_HOME, 0, 0, 0);                             keybd_event(VK_HOME, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlock8":                             keybd_event(VK_UP, 0, 0, 0);                             keybd_event(VK_UP, 0, KEYEVENTF_KEYUP, 0);                             break;                         case "btnnumlock9":                             keybd_event(VK_PRIOR, 0, 0, 0);                             keybd_event(VK_PRIOR, 0, KEYEVENTF_KEYUP, 0);                             break;                     }                 }             }             catch (Exception ex)             {                 return null;             }               //INSTANT C# NOTE: Inserted the following 'return' since all code paths must return a value in C#:             return null;           }           #endregion         private void btn1_Click(object sender, EventArgs e)         {               try             {                                Button key = (Button)sender;                 whichbuttonpushed(key.Name);                 SetActiveWindow(8975651603260375040); //This Line Very Impportant             }             catch (Exception ex)             {                   MessageBox.Show(ex.Message, "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1);                 return;               }             finally             {                 SetActiveWindow(8975651603260375040);             }           }         private void btnlock_Click(object sender, EventArgs e)         {             try             {                 Button key = (Button)sender;                 whichbuttonpushed(key.Name);                 SetActiveWindow(8975651603260375040); //This Line Very Impportant              }             catch (Exception ex)             {                 MessageBox.Show(ex.Message, "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1);                 return;             }             finally             {                   SetActiveWindow(8975651603260375040);             }         }         private void btnsolwindows_Click(object sender, EventArgs e)         {             try             {                 Button key = (Button)sender;                 whichbuttonpushed(key.Name);                 SetActiveWindow(8975651603260375040); //This Line Very Impportant              }             catch (Exception ex)             {                 MessageBox.Show(ex.Message, "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1);                 return;             }               finally             {                 SetActiveWindow(8975651603260375040);             }           }         private void btnsolshift_Click(object sender, EventArgs e)         {               try             {                 Button key = (Button)sender;                 whichbuttonpushed(key.Name);                 SetActiveWindow(8975651603260375040); //This Line Very Impportant              }             catch (Exception ex)             {                 MessageBox.Show(ex.Message, "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1);                 return;             }             finally             {                 SetActiveWindow(8975651603260375040);             }         }         private void btn2_Click(object sender, EventArgs e)         {             try             {                 Button key = (Button)sender;                 whichbuttonpushed(key.Name);                 SetActiveWindow(8975651603260375040); //This Line Very Impportant                }             catch (Exception ex)             {                   MessageBox.Show(ex.Message, "ERROR", MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1);                 return;             }             finally             {                 SetActiveWindow(8975651603260375040);             }           }        } }