mfc一个简单的计算器

vcxproj 文件是vc++的主项目文件
filters 是筛选器文件
项目名.h 是应用程序的主头文件
项目名.cpp是主应用程序的源文件
atlimage.h 是CImage类的头文件，用于文件的打开，显示，保存，最好包含在stdafx.h文件里面
Overridables 重写虚函数
2017-5-18：第一个windows程序：简单的计算器

#include "resource.h"
#include <Windows.h>

//资源总管

INT_PTR CALLBACK theProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
        switch (uMsg)
        {
        case WM_COMMAND:
               if (LOWORD(wParam) == IDOK)
               {
                       int left = GetDlgItemInt(hwndDlg, IDC_EDIT1, NULL, TRUE);
                       int right = GetDlgItemInt(hwndDlg, IDC_EDIT2, NULL, TRUE);
                       SetDlgItemInt(hwndDlg, IDC_EDIT3, left + right, TRUE);
                       MessageBox(hwndDlg, "你点击了ok", "瓜皮须知", 0);
               }
               if (LOWORD(wParam) == IDC_EXIT)
               {
                       EndDialog(hwndDlg, IDC_close);
               }
               if (LOWORD(wParam) == IDC_close)
               {
                       EndDialog(hwndDlg, IDC_close);
               }
               if (LOWORD(wParam) == IDCANCEL)
               {
                       MessageBox(hwndDlg, "你个瓜皮","linshi", 0);
                       EndDialog(hwndDlg, IDCANCEL);
               }
               break;

        }
        //消息回调函数Umsg是消息的种类,消息是事件回调的返回值,各种消息种类都在此汇总
        return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrev, LPSTR lpCmd, int nCmdShow)
{
        //messageBox FindWindow
        DialogBox(hInstance, (LPCTSTR)kele, NULL, theProc);
               return 0;
}

#resource.h里面包含的是所有资源的id，也控制许多常量的id,再是喊不支持输入

四则运算计算器，支持除数为0报错 #include "resource.h" #include <Windows.h> #include <stdio.h>

//资源总管
double GetDlgItemDouble(HWND hwnd, UINT nID)
{
        char s[256];
        GetDlgItemText(hwnd, nID, s, sizeof(s));
        return atof(s);
}
//atof atoi
//itoa   ftoa???
//sprintf 数字》》字符串   格式化函数
void SetDlgItemDouble(HWND hwnd, UINT nID, double db)
{
        char s[256];
        SetDlgItemText(hwnd, nID, s);
}
INT_PTR CALLBACK theProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
        switch (uMsg)
        {
        case WM_COMMAND:
               if (LOWORD(wParam) == IDOK)
               {
                       int left = GetDlgItemInt(hwndDlg, IDC_EDIT1, NULL, TRUE);
                       int right = GetDlgItemInt(hwndDlg, IDC_EDIT2, NULL, TRUE);
                       SetDlgItemInt(hwndDlg, IDC_EDIT3, left + right, TRUE);

                 left = GetDlgItemInt(hwndDlg, IDC_EDIT4, NULL, TRUE);
                 right = GetDlgItemInt(hwndDlg, IDC_EDIT5, NULL, TRUE);
               SetDlgItemInt(hwndDlg, IDC_EDIT6, left - right, TRUE);
                       MessageBox(hwndDlg, "你点击了ok", "瓜皮须知", 0);
                       left = GetDlgItemInt(hwndDlg, IDC_EDIT7, NULL, TRUE);
                       right = GetDlgItemInt(hwndDlg, IDC_EDIT8, NULL, TRUE);
                       SetDlgItemInt(hwndDlg, IDC_EDIT9, left * right, TRUE);
                       left = GetDlgItemInt(hwndDlg, IDC_EDIT10, NULL, TRUE);
                       right = GetDlgItemInt(hwndDlg, IDC_EDIT11, NULL, TRUE);
                       if (right == 0)
                       {
                              MessageBox(hwndDlg, "兄弟讲道理啊", "你是瓜皮", 0);
                              break;
                       }
                       SetDlgItemInt(hwndDlg, IDC_EDIT12, left/right, TRUE);
               }
               if (LOWORD(wParam) == IDC_EXIT)
               {
                       EndDialog(hwndDlg, IDC_close);
               }
               if (LOWORD(wParam) == IDC_close)
               {
                       MessageBox(hwndDlg, "gua", "hello", 0);
                       EndDialog(hwndDlg, IDC_close);
               }
               if (LOWORD(wParam) == IDCANCEL)
               {
                       MessageBox(hwndDlg, "你个瓜皮","linshi", 0);
                       EndDialog(hwndDlg, IDCANCEL);
               }
               if (LOWORD(wParam) == ID_EXIT)
               {
                       EndDialog(hwndDlg, ID_EXIT);
               }
               break;

        }
        //消息回调函数Umsg是消息的种类,消息是事件回调的返回值,各种消息种类都在此汇总
        return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrev, LPSTR lpCmd, int nCmdShow)
{
        //messageBox FindWindow
        DialogBox(hInstance, (LPCTSTR)kele, NULL, theProc);
               return 0;
}





//double版计算器
#include "resource.h"
#include <Windows.h>
#include <stdio.h>

//资源总管
double GetDlgItemDouble(HWND hwnd, UINT nID)
{
        char s[256];
        GetDlgItemText(hwnd, nID, s, sizeof(s));
        return atof(s);
}
//atof atoi
//itoa   ftoa???
//sprintf 数字》》字符串   格式化函数
void SetDlgItemDouble(HWND hwnd, UINT nID, double db)
{
        char s[256];
        sprintf(s, "%lf", db);
        SetDlgItemText(hwnd, nID, s);
}
INT_PTR CALLBACK theProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
        switch (uMsg)
        {
        case WM_COMMAND:
               if (LOWORD(wParam) == IDOK)
               {
                       double left = GetDlgItemDouble(hwndDlg, IDC_EDIT1);
                       double right = GetDlgItemDouble(hwndDlg, IDC_EDIT2);
                       SetDlgItemDouble(hwndDlg, IDC_EDIT3, left + right);

                       left = GetDlgItemDouble(hwndDlg, IDC_EDIT4);
                        right = GetDlgItemDouble(hwndDlg, IDC_EDIT5);
                       SetDlgItemDouble(hwndDlg, IDC_EDIT6, left - right);

                        left = GetDlgItemDouble(hwndDlg, IDC_EDIT7);
                        right = GetDlgItemDouble(hwndDlg, IDC_EDIT8);
                       SetDlgItemDouble(hwndDlg, IDC_EDIT9, left * right);

                        left = GetDlgItemDouble(hwndDlg, IDC_EDIT10);
                       right = GetDlgItemDouble(hwndDlg, IDC_EDIT11);
                       if (right == 0)
                       {
                              MessageBox(hwndDlg, "不要这样，先生", "给瓜皮的一份信", 0);
                                      break;
                       }
                       SetDlgItemDouble(hwndDlg, IDC_EDIT12, left / right);
               }
               if (LOWORD(wParam) == IDC_EXIT)
               {
                       EndDialog(hwndDlg, IDC_close);
               }
               if (LOWORD(wParam) == IDC_close)
               {
                       MessageBox(hwndDlg, "gua", "hello", 0);
                       EndDialog(hwndDlg, IDC_close);
               }
               if (LOWORD(wParam) == IDCANCEL)
               {
                       MessageBox(hwndDlg, "你个瓜皮","linshi", 0);
                       EndDialog(hwndDlg, IDCANCEL);
               }
               if (LOWORD(wParam) == ID_EXIT)
               {
                       EndDialog(hwndDlg, ID_EXIT);
               }
               break;

        }
        //消息回调函数Umsg是消息的种类,消息是事件回调的返回值,各种消息种类都在此汇总
        return 0;
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrev, LPSTR lpCmd, int nCmdShow)
{
        //messageBox FindWindow
        DialogBox(hInstance, (LPCTSTR)kele, NULL, theProc);
               return 0;
}