C语言调用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("Welcome"),  //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));

    }

     
}
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;
  }

}
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 ,windows10.

效果如下:

C语言调用WindowApi实现计算器

 

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