C调用WindowApi实现计算器
#include <windows.h> #include <stdlib.h> #include <stdio.h> #include <string.h> LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); void OperationClear(char* ); void SetNumber(char*); void SetOp(char*); void SetDot(char); void Round(char*); LPCTSTR calcNumber(double,double,char); char resultNumber[30]; HMENU hMenu[18]; HWND hFormula[2]; HINSTANCE hInst; HFONT hFont; double number1 ; double number2 ; char labelBuf[20]; char beforeOp; char buf[20]; char oper[10] = {0}; int nBtnHeight = 200; int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow ){ static TCHAR szClassName[] = TEXT("计算器"); //窗口类名 HWND hwnd; //窗口句柄 MSG msg; //消息 WNDCLASS wndclass; //窗口类 static HWND hBtn[18]; HDC hdc; int wmId, wmEvent; PAINTSTRUCT ps; /**********第①步：注册窗口类**********/ //为窗口类的各个字段赋值 wndclass.style = CS_HREDRAW | CS_VREDRAW; //窗口风格 wndclass.lpfnWndProc = WndProc; //窗口过程 wndclass.cbClsExtra = 0; //暂时不需要理解 wndclass.cbWndExtra = 0; //暂时不需要理解 wndclass.hInstance = hInstance; //当前窗口句柄 wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION); //窗口图标 wndclass.hCursor = LoadCursor (NULL, IDC_ARROW); //鼠标样式 wndclass.hbrBackground= (HBRUSH) GetStockObject (WHITE_BRUSH); //窗口背景画刷 wndclass.lpszMenuName = NULL ; //窗口菜单 wndclass.lpszClassName= szClassName; //窗口类名 //注册窗口 RegisterClass(&wndclass); /*****第②步：创建窗口(并让窗口显示出来)*****/ hwnd = CreateWindow( szClassName, //窗口类的名字 TEXT("编写一个计算器"), //窗口标题（出现在标题栏） WS_OVERLAPPEDWINDOW, //窗口风格 CW_USEDEFAULT, //初始化时x轴的位置 CW_USEDEFAULT, //初始化时y轴的位置 800, //窗口宽度 600, //窗口高度 NULL, //父窗口句柄 NULL, //窗口菜单句柄 hInstance, //当前窗口的句柄 NULL //不使用该值 ); hFont = CreateFont( -15/*高度*/, -7.5/*宽度*/, 0, 0, 400 /*一般这个值设为400*/, FALSE/*不带斜体*/, FALSE/*不带下划线*/, FALSE/*不带删除线*/, DEFAULT_CHARSET, //使用默认字符集 OUT_CHARACTER_PRECIS, CLIP_CHARACTER_PRECIS, //这行参数不用管 DEFAULT_QUALITY, //默认输出质量 FF_DONTCARE, //不指定字体族*/ TEXT("微软雅黑") //字体名 ); int t = 0; for(int i=0;i<18;i++){ hMenu[i] = (i+10); t++; char string[6] = {0}; itoa(i,string,10); int x = 30 + (150*t); if((i+1)%3==0){ t = 0; } int y = nBtnHeight + (i/3)*50; //创建按钮控件 if(i==10){ hBtn[i] = CreateWindow( TEXT("button"), //按钮控件的类名 TEXT("+/-"), WS_CHILD | WS_VISIBLE | WS_BORDER | BS_FLAT/*扁平样式*/, x /*X坐标*/, y /*Y坐标*/, 150 /*宽度*/, 50/*高度*/, hwnd, (HMENU)(hMenu[i]) /*控件唯一标识符*/, hInstance, NULL ); SendMessage(hBtn[i], WM_SETFONT, (WPARAM)hFont, NULL);//设置按钮字体 }else if(i==11){ hBtn[i] = CreateWindow( TEXT("button"), //按钮控件的类名 TEXT("."), WS_CHILD | WS_VISIBLE | WS_BORDER | BS_FLAT/*扁平样式*/, x /*X坐标*/, y /*Y坐标*/, 150 /*宽度*/, 50/*高度*/, hwnd, (HMENU)(hMenu[i]) /*控件唯一标识符*/, hInstance, NULL ); SendMessage(hBtn[i], WM_SETFONT, (WPARAM)hFont, NULL);//设置按钮字体 }else if(i==12){//+ hBtn[i] = CreateWindow( TEXT("button"), //按钮控件的类名 TEXT("+"), WS_CHILD | WS_VISIBLE | WS_BORDER | BS_FLAT/*扁平样式*/, x /*X坐标*/, y /*Y坐标*/, 150 /*宽度*/, 50/*高度*/, hwnd, (HMENU)(hMenu[i]) /*控件唯一标识符*/, hInstance, NULL ); SendMessage(hBtn[i], WM_SETFONT, (WPARAM)hFont, NULL);//设置按钮字体 }else if(i==13){//- hBtn[i] = CreateWindow( TEXT("button"), //按钮控件的类名 TEXT("-"), WS_CHILD | WS_VISIBLE | WS_BORDER | BS_FLAT/*扁平样式*/, x /*X坐标*/, y /*Y坐标*/, 150 /*宽度*/, 50/*高度*/, hwnd, (HMENU)(hMenu[i]) /*控件唯一标识符*/, hInstance, NULL ); SendMessage(hBtn[i], WM_SETFONT, (WPARAM)hFont, NULL);//设置按钮字体 }else if(i==14){//* hBtn[i] = CreateWindow( TEXT("button"), //按钮控件的类名 TEXT("X"), WS_CHILD | WS_VISIBLE | WS_BORDER | BS_FLAT/*扁平样式*/, x /*X坐标*/, y /*Y坐标*/, 150 /*宽度*/, 50/*高度*/, hwnd, (HMENU)(hMenu[i]) /*控件唯一标识符*/, hInstance, NULL ); SendMessage(hBtn[i], WM_SETFONT, (WPARAM)hFont, NULL);//设置按钮字体 }else if(i==15){//* hBtn[i] = CreateWindow( TEXT("button"), //按钮控件的类名 TEXT("/"), WS_CHILD | WS_VISIBLE | WS_BORDER | BS_FLAT/*扁平样式*/, x /*X坐标*/, y /*Y坐标*/, 150 /*宽度*/, 50/*高度*/, hwnd, (HMENU)(hMenu[i]) /*控件唯一标识符*/, hInstance, NULL ); SendMessage(hBtn[i], WM_SETFONT, (WPARAM)hFont, NULL);//设置按钮字体 }else if(i==16){//* hBtn[i] = CreateWindow( TEXT("button"), //按钮控件的类名 TEXT("C"), WS_CHILD | WS_VISIBLE | WS_BORDER | BS_FLAT/*扁平样式*/, x /*X坐标*/, y /*Y坐标*/, 150 /*宽度*/, 50/*高度*/, hwnd, (HMENU)(hMenu[i]) /*控件唯一标识符*/, hInstance, NULL ); SendMessage(hBtn[i], WM_SETFONT, (WPARAM)hFont, NULL);//设置按钮字体 }else if(i==17){//* hBtn[i] = CreateWindow( TEXT("button"), //按钮控件的类名 TEXT("="), WS_CHILD | WS_VISIBLE | WS_BORDER | BS_FLAT/*扁平样式*/, x /*X坐标*/, y /*Y坐标*/, 150 /*宽度*/, 50/*高度*/, hwnd, (HMENU)(hMenu[i]) /*控件唯一标识符*/, hInstance, NULL ); SendMessage(hBtn[i], WM_SETFONT, (WPARAM)hFont, NULL);//设置按钮字体 }else{ hBtn[i] = CreateWindow( TEXT("button"), //按钮控件的类名 TEXT(string), WS_CHILD | WS_VISIBLE | WS_BORDER | BS_FLAT/*扁平样式*/, x /*X坐标*/, y /*Y坐标*/, 150 /*宽度*/, 50/*高度*/, hwnd, (HMENU)(hMenu[i]) /*控件唯一标识符*/, hInstance, NULL ); SendMessage(hBtn[i], WM_SETFONT, (WPARAM)hFont, NULL);//设置按钮字体 } } //显示窗口 ShowWindow (hwnd, iCmdShow); //更新（绘制）窗口 UpdateWindow (hwnd); /**********第③步：消息循环**********/ while( GetMessage(&msg, NULL, 0, 0) ){ TranslateMessage(&msg); //翻译消息 DispatchMessage (&msg); //分派消息 } return msg.wParam; } /**********第④步：窗口过程**********/ LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam){ HDC hdc; //设备环境句柄 PAINTSTRUCT ps; RECT rect; static HFONT hFont2; //逻辑字体 static HFONT hFont3; //逻辑字体 int wmId, wmEvent; switch (message){ case WM_CREATE: hFont2 = CreateFont(-20/*高*/, -10/*宽*/, 0, 0, 400 /*一般这个值设为400*/, FALSE/*斜体?*/, FALSE/*下划线?*/, FALSE/*删除线?*/,DEFAULT_CHARSET, OUT_CHARACTER_PRECIS, CLIP_CHARACTER_PRECIS, DEFAULT_QUALITY, FF_DONTCARE, TEXT("微软雅黑") ); hFont3 = CreateFont(-30/*高*/, -20/*宽*/, 0, 0, 400 /*一般这个值设为400*/, FALSE/*斜体?*/, FALSE/*下划线?*/, FALSE/*删除线?*/,DEFAULT_CHARSET, OUT_CHARACTER_PRECIS, CLIP_CHARACTER_PRECIS, DEFAULT_QUALITY, FF_DONTCARE, TEXT("微软雅黑") ); /**创建算式显示框*/ hFormula[0] = CreateWindow(TEXT("static"), TEXT(""), WS_CHILD | WS_VISIBLE /*边框| WS_BORDER*/ | ES_AUTOHSCROLL /*水平滚动*/ | ES_RIGHT /*文本右对齐*/, 180 /*x坐标*/, (nBtnHeight-100) /*y坐标*/, 450 /*宽度*/, 30 /*高度*/, hwnd /*父窗口句柄*/, (HMENU)2 /*控件ID*/, hInst /*当前程序实例句柄*/, NULL ); SendMessage(hFormula[0], WM_SETFONT, (WPARAM)hFont2, NULL); /**创建结果显示框*/ hFormula[1] = CreateWindow(TEXT("static"), TEXT(""), WS_CHILD | WS_VISIBLE /*边框| WS_BORDER */ | ES_AUTOHSCROLL /*水平滚动*/ | ES_RIGHT /*文本右对齐*/, 180 /*x坐标*/, (nBtnHeight-70) /*y坐标*/, 450 /*宽度*/, 70 /*高度*/, hwnd /*父窗口句柄*/, (HMENU)3 /*控件ID*/, hInst /*当前程序实例句柄*/, NULL ); SendMessage(hFormula[1], WM_SETFONT, (WPARAM)hFont3, NULL); break; //窗口绘制消息 case WM_PAINT: hdc = BeginPaint (hwnd, &ps) ; EndPaint (hwnd, &ps) ; break; case WM_COMMAND: wmId = LOWORD(wParam); wmEvent = HIWORD(wParam); char btnText[2] = {0}; switch (wmId){ case 10: //按下按钮0 itoa(0,btnText,10); //MessageBox(NULL, TEXT(btnText), TEXT("提示"), MB_OK); SetNumber(btnText); break; case 11: //按下按钮1 itoa(1,btnText,10); SetNumber(btnText); //MessageBox(NULL, TEXT(btnText), TEXT("提示"), MB_OK); break; case 12: //按下按钮2 itoa(2,btnText,10); //MessageBox(NULL, TEXT(btnText), TEXT("提示"), MB_OK); SetNumber(btnText); break; case 13: //按下按钮3 itoa(3,btnText,10); //MessageBox(NULL, TEXT(btnText), TEXT("提示"), MB_OK); SetNumber(btnText); break; case 14: //按下按钮4 itoa(4,btnText,10); //MessageBox(NULL, TEXT(btnText), TEXT("提示"), MB_OK); SetNumber(btnText); break; case 15: //按下按钮5 itoa(5,btnText,10); //MessageBox(NULL, TEXT(btnText), TEXT("提示"), MB_OK); SetNumber(btnText); break; case 16: //按下按钮6 itoa(6,btnText,10); //MessageBox(NULL, TEXT(btnText), TEXT("提示"), MB_OK); SetNumber(btnText); break; case 17: //按下按钮7 itoa(7,btnText,10); //MessageBox(NULL, TEXT(btnText), TEXT("提示"), MB_OK); SetNumber(btnText); break; case 18: //按下按钮8 itoa(8,btnText,10); //MessageBox(NULL, TEXT(btnText), TEXT("提示"), MB_OK); SetNumber(btnText); break; case 19: //按下按钮9 itoa(9,btnText,10); //MessageBox(NULL, TEXT(btnText), TEXT("提示"), MB_OK); SetNumber(btnText); break; case 20: //按下按钮+/- //MessageBox(NULL, TEXT("+/-"), TEXT("提示"), MB_OK); break; case 21: //按下按钮 SetDot('.'); //MessageBox(NULL, TEXT("."), TEXT("提示"), MB_OK); break; case 22: //按下按钮 + oper[0] = '+'; SetOp(&oper); break; case 23: //按下按钮 - oper[0] = '-'; SetOp(&oper); break; case 24: //按下按钮 X oper[0] = 'x'; SetOp(&oper); break; case 25: //按下按钮 / oper[0] = '/'; SetOp(&oper); break; case 26: //按下按钮 C oper[0] = 'C'; OperationClear(&oper); break; case 27: //按下按钮 = oper[0] = '='; SetOp(&oper); break; default: //不处理的消息一定要交给 DefWindowProc 处理。 return DefWindowProc(hwnd, message, wParam, lParam); } break; //窗口销毁消息 case WM_DESTROY: DeleteObject(hFont); PostQuitMessage(0) ; return 0 ; } return DefWindowProc(hwnd, message, wParam, lParam) ; } void OperationClear(char* op ){ if(op[0] == 'C'){ //MessageBox(NULL, TEXT(op), TEXT("提示"), MB_OK); number1 = 0.0d; number2 = 0.0d; char result[2] = {0}; result[0] = ' '; SetWindowText(hFormula[0],(LPCTSTR)result); SetWindowText(hFormula[1],(LPCTSTR)result); memset(buf,0,19); memset(labelBuf,0,19); memset(resultNumber,0,sizeof(resultNumber)); } return TEXT("Operation"); } void SetDot(char dot){ int len = strlen(&buf); if(len>0){ char c = buf[len-1]; if(c == '.'){ return ; } } char* p = strchr(&buf,'.'); if(p!=NULL){ return ; } double bufNum = atof(&buf); if(bufNum > 9999999999.9d){ return ; } strncat(&buf,&dot,1); strncat(&labelBuf,&dot,1); SetWindowText(hFormula[0],(LPCTSTR)labelBuf); } void SetNumber(char* num){ //10000000000 double bufNum = atof(&buf); if(bufNum > 9999999999.9d){ return ; } strncat(&buf,num,1); strncat(&labelBuf,num,1); SetWindowText(hFormula[0],(LPCTSTR)labelBuf); } void SetOp(char* op){ int len = strlen(&labelBuf); if(len==0){ return ; } if(len>0){ char c = labelBuf[len-1]; if(c == '+' || c=='-' || c=='x' || c=='/' || c == '='){ return ; } } if(op[0] == '+' || op[0]=='-' || op[0]=='x' || op[0]=='/' ){ number1 = atof(&buf); beforeOp = op[0]; memset(buf,0,sizeof(buf)); } if(op[0] == '='){ number2 = atof(&buf); LPCTSTR ret = calcNumber(number1,number2,beforeOp); SetWindowText(hFormula[1],ret); memset(resultNumber,0,sizeof(resultNumber)); } strncat(&labelBuf,op,1); SetWindowText(hFormula[0],(LPCTSTR)labelBuf); if(op[0] == '='){ number1 = 0.0d; number2 = 0.0d; memset(buf,0,sizeof(buf)); memset(labelBuf,0,sizeof(labelBuf)); SetWindowText(hFormula[0],(LPCTSTR)labelBuf); } // char lenStr[5] = {0}; //itoa(len,lenStr,10); //MessageBox(NULL, TEXT(lenStr), TEXT("提示"), MB_OK); } LPCTSTR calcNumber(double n1,double n2,char op){ //MessageBox(NULL, TEXT("2222"), TEXT("提示"), MB_OK); if(op == '+'){ double n = n1 + n2; memset(resultNumber,0,sizeof(resultNumber)); snprintf(resultNumber,11,"%.12f",n); Round(resultNumber) ; return (LPCTSTR)resultNumber; } if(op == '-'){ double n = n1 - n2; memset(resultNumber,0,sizeof(resultNumber)); snprintf(resultNumber,11,"%.12f",n); Round(resultNumber) ; return (LPCTSTR)resultNumber; } if(op == 'x'){ double n = n1 * n2; memset(resultNumber,0,sizeof(resultNumber)); snprintf(resultNumber,11,"%.12f",n); Round(resultNumber) ; return (LPCTSTR)resultNumber; } if(op == '/'){ double n; if(n2==0){ n = 0; }else{ n = n1 / n2; } memset(resultNumber,0,sizeof(resultNumber)); snprintf(resultNumber,11,"%.12f",n); Round(resultNumber) ; return (LPCTSTR)resultNumber; } return (LPCTSTR)resultNumber; } void Round(char* resultStr){ int length = strlen(resultStr); int m = length -1; int k = 0; do{ if(resultStr[m]=='.'){ k = m; break; } if(resultStr[m]!='0'){ break; } if(resultStr[m]=='0'){ resultStr[m] = '\0'; } m--; }while(m>0); if(k == strlen(resultStr)-1){ resultStr[k] = '\0'; } }
编译环境codeblocks winodws10;
效果如下：
