win32api添加按钮与响应

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#if defined(UNICODE) && !defined(_UNICODE)     #define _UNICODE #elif defined(_UNICODE) && !defined(UNICODE)     #define UNICODE #endif   #include <tchar.h> #include <windows.h>     #define IDB_ONE     3301  #define IDB_TWO     3302  #define IDB_THREE   3303     /*  Declare Windows procedure  */ LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);   /*  Make the class name into a global variable  */ TCHAR szClassName[ ] = _T("firstapp");   int WINAPI WinMain (HINSTANCE hThisInstance,                      HINSTANCE hPrevInstance,                      LPSTR lpszArgument,                      int nCmdShow) {     HWND hwnd;               /* This is the handle for our window */     MSG messages;            /* Here messages to the application are saved */     WNDCLASSEX wincl;        /* Data structure for the windowclass */       /* The Window structure */     wincl.hInstance = hThisInstance;     wincl.lpszClassName = szClassName;     wincl.lpfnWndProc = WindowProcedure;      /* This function is called by windows */     wincl.style = CS_DBLCLKS;                 /* Catch double-clicks */     wincl.cbSize = sizeof (WNDCLASSEX);       /* Use default icon and mouse-pointer */     wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);     wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);     wincl.hCursor = LoadCursor (NULL, IDC_ARROW);     wincl.lpszMenuName = NULL;                 /* No menu */     wincl.cbClsExtra = 0;                      /* No extra bytes after the window class */     wincl.cbWndExtra = 0;                      /* structure or the window instance */     /* Use Windows's default colour as the background of the window */     wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;       /* Register the window class, and if it fails quit the program */     if (!RegisterClassEx (&wincl))         return 0;       /* The class is registered, let's create the program*/     hwnd = CreateWindowEx (            0,                   /* Extended possibilites for variation */            szClassName,         /* Classname */            _T("firstapp"),       /* Title Text */            WS_OVERLAPPEDWINDOW, /* default window */            CW_USEDEFAULT,       /* Windows decides the position */            CW_USEDEFAULT,       /* where the window ends up on the screen */            544,                 /* The programs width */            375,                 /* and height in pixels */            HWND_DESKTOP,        /* The window is a child-window to desktop */            NULL,                /* No menu */            hThisInstance,       /* Program Instance handler */            NULL                 /* No Window Creation data */            );       /* Make the window visible on the screen */     ShowWindow (hwnd, nCmdShow);       /* Run the message loop. It will run until GetMessage() returns 0 */     while (GetMessage (&messages, NULL, 0, 0))     {         /* Translate virtual-key messages into character messages */         TranslateMessage(&messages);         /* Send message to WindowProcedure */         DispatchMessage(&messages);     }       /* The program return-value is 0 - The value that PostQuitMessage() gave */     return messages.wParam; }     /*  This function is called by the Windows function DispatchMessage()  */   LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {     switch (message)                  /* handle the messages */     {         case WM_DESTROY:             PostQuitMessage (0);       /* send a WM_QUIT to the message queue */             break;           case WM_CREATE:             //创建窗口时调用,我们也可以在这里面创建按钮             {                  //创建三个按钮                  CreateWindow(TEXT("Button"), TEXT("按钮一"), WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON,                              35, 10, 120, 60, hwnd, (HMENU)IDB_ONE, ((LPCREATESTRUCT)lParam)->hInstance, NULL);                  CreateWindow(TEXT("Button"), TEXT("按钮二"), WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON,                              35, 80, 120, 60, hwnd, (HMENU)IDB_TWO, ((LPCREATESTRUCT)lParam)->hInstance, NULL);                  CreateWindow(TEXT("Button"), TEXT("按钮三"), WS_VISIBLE | WS_CHILD | BS_PUSHBUTTON,                              35, 150, 120, 60, hwnd, (HMENU)IDB_THREE, ((LPCREATESTRUCT)lParam)->hInstance, NULL);              }             break;             case WM_COMMAND:          {              switch(LOWORD(wParam))              {                  case IDB_ONE:                      MessageBox(hwnd, TEXT("您点击了第一个按钮。"), TEXT("提示"), MB_OK | MB_ICONINFORMATION);                      SendMessage((HWND)lParam, WM_SETTEXT, (WPARAM)NULL, (LPARAM)TEXT("第一个按鈕已点击"));                      break;                  case IDB_TWO:                      MessageBox(hwnd, TEXT("您点击了第二个按钮。"), TEXT("提示"), MB_OK | MB_ICONINFORMATION);                      SendMessage((HWND)lParam, WM_SETTEXT, (WPARAM)NULL, (LPARAM)TEXT("第二个按鈕已点击"));                      break;                  case IDB_THREE:                      MessageBox(hwnd, TEXT("您点击了第三个按钮。"), TEXT("提示"), MB_OK | MB_ICONINFORMATION);                      SendMessage((HWND)lParam, WM_SETTEXT, (WPARAM)NULL, (LPARAM)TEXT("第三个按鈕已点击"));                      break;                  default:                      break;              }         }                   default:                      /* for messages that we don't deal with */             return DefWindowProc (hwnd, message, wParam, lParam);     }       return 0; }