mfc实现计算器

#include <Windows.h> #include "resource.h" #include <math.h> #include <stdio.h> void OnAdd(HWND hwndDlg)//加法 { /*int nLeft=GetDlgItemInt(hwndDlg,IDC_LEFT,NULL,TRUE); //取hwndDlg窗口的控件IDC_LEFT的值，TRUE表示处理有符号数据 int nRight=GetDlgItemInt(hwndDlg,IDC_RIGHT,NULL,TRUE); SetDlgItemInt(hwndDlg,IDC_RESULT,nLeft+nRight,TRUE); //给hwndDlg窗口的控件IDC_LEFT的赋值，TRUE表示处理有符号数据*/ char sLeft[20],sRight[20],sResult[32]; GetDlgItemText(hwndDlg,IDC_LEFT,sLeft,sizeof(sLeft)); GetDlgItemText(hwndDlg,IDC_RIGHT,sRight,sizeof(sRight)); double fLeft=atof(sLeft); double fRight=atof(sRight); sprintf(sResult,"%lf",(fLeft+fRight)); SetDlgItemText(hwndDlg,IDC_RESULT,sResult); } void OnSub(HWND hwndDlg)//减法 { /*int nLeft=GetDlgItemInt(hwndDlg,IDC_LEFT,NULL,TRUE); int nRight=GetDlgItemInt(hwndDlg,IDC_RIGHT,NULL,TRUE); SetDlgItemInt(hwndDlg,IDC_RESULT,nLeft-nRight,TRUE);*/ char sLeft[20],sRight[20],sResult[32]; GetDlgItemText(hwndDlg,IDC_LEFT,sLeft,sizeof(sLeft)); GetDlgItemText(hwndDlg,IDC_RIGHT,sRight,sizeof(sRight)); double fLeft=atof(sLeft); double fRight=atof(sRight); sprintf(sResult,"%lf",(fLeft-fRight)); SetDlgItemText(hwndDlg,IDC_RESULT,sResult); } void OnMul(HWND hwndDlg)//乘法 { /*int nLeft=GetDlgItemInt(hwndDlg,IDC_LEFT,NULL,TRUE); int nRight=GetDlgItemInt(hwndDlg,IDC_RIGHT,NULL,TRUE); SetDlgItemInt(hwndDlg,IDC_RESULT,nLeft*nRight,TRUE);*/ char sLeft[20],sRight[20],sResult[32]; GetDlgItemText(hwndDlg,IDC_LEFT,sLeft,sizeof(sLeft)); GetDlgItemText(hwndDlg,IDC_RIGHT,sRight,sizeof(sRight)); double fLeft=atof(sLeft); double fRight=atof(sRight); sprintf(sResult,"%lf",(fLeft*fRight)); SetDlgItemText(hwndDlg,IDC_RESULT,sResult); } void OnDiv(HWND hwndDlg)//除法 { /*int nLeft=GetDlgItemInt(hwndDlg,IDC_LEFT,NULL,TRUE); int nRight=GetDlgItemInt(hwndDlg,IDC_RIGHT,NULL,TRUE);*/ char sLeft[20],sRight[20],sResult[32]; GetDlgItemText(hwndDlg,IDC_LEFT,sLeft,sizeof(sLeft)); GetDlgItemText(hwndDlg,IDC_RIGHT,sRight,sizeof(sRight)); double fLeft=atof(sLeft); double fRight=atof(sRight); if(fRight>-0.00000001&&fRight<0.00000001) { MessageBox(hwndDlg,"除数不能为0","Caption",MB_RETRYCANCEL | MB_ICONEXCLAMATION); return ; } sprintf(sResult,"%lf",(fLeft/fRight)); SetDlgItemText(hwndDlg,IDC_RESULT,sResult); } BOOL OnLogin(HWND hwndDlg) { char acc[20],pwd[20]; GetDlgItemText(hwndDlg,IDC_ACCOUNT,acc,sizeof(acc)); GetDlgItemText(hwndDlg,IDC_PWD,pwd,sizeof(pwd)); if(strcmp(acc,"admin")==0&&strcmp(pwd,"123456")==0) return TRUE; else return FALSE; } BOOL CALLBACK LoginProc(HWND hwndDlg,UINT uMsg,WPARAM wParam,LPARAM lParam) { switch(uMsg) { case WM_COMMAND: { UINT nId=LOWORD(wParam); switch(nId) { case IDCANCEL: EndDialog(hwndDlg,IDCANCEL); break; case IDOK: if(OnLogin(hwndDlg)) { EndDialog(hwndDlg,IDOK); } else { MessageBox(hwndDlg,"账号或密码错误!","提示",MB_RETRYCANCEL); } break; } } return TRUE; } return FALSE; } BOOL CALLBACK DialogProc(HWND hwndDlg,UINT uMsg,WPARAM wParam,LPARAM lParam)//与DialogBox配合使用的回调函数 { switch(uMsg) { case WM_COMMAND://包括菜单项、工具栏、控件按钮消息 { UINT nId=LOWORD(wParam);//区别不同按钮的id switch(nId) { case IDCANCEL: EndDialog(hwndDlg,0);//0表示从对话框返回到应用程序的值 break; case IDADD: OnAdd(hwndDlg); break; case IDSUB: OnSub(hwndDlg); break; case IDMUL: OnMul(hwndDlg); break; case IDDIV: OnDiv(hwndDlg); break; } } return TRUE; } return FALSE; } int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR IpCmdLine,int nShowCmd) { /*HWND hWnd=::FindWindow(NULL,"pt - 记事本"); MessageBox(hWnd,"hhhhh","Caption",MB_OK);*/ int m = DialogBox(hInstance,(LPCTSTR)IDD_LOGIN,NULL,LoginProc); if(m==IDCANCEL) return -1; int n = DialogBox(hInstance,(LPCTSTR)IDD_COMPUTER,NULL,DialogProc); return 0; }