Win32Project1.c
// Win32Project1.cpp : 定义应用程序的入口点。
//



#include"stdafx.h"
#include<windows.h>
#include<windowsx.h>
#include"Resource.h"
#include "Win32Project1.h"

#pragma comment(lib,"comctl32.lib")

BOOL   WINAPI  Main_Proc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg)
    {
        HANDLE_MSG(hwnd, WM_INITDIALOG, Main_onlnicDialog);
        HANDLE_MSG(hwnd, WM_COMMAND, Main_onCommand);
        HANDLE_MSG(hwnd, WM_CLOSE, Main_Close);

    }
    return FALSE;
}
BOOL Main_onlnicDialog(HWND hwnd, HWND hwndm, LPARAM lParam)
{
    return TRUE;
}
void Main_onCommand(HWND hwnd, int id, HWND hwndCTl, UINT codeNotify)
{
    switch (id)
    {
    case IDOK:
    {
        TCHAR ONE[256], TWO[256];
            GetDlgItemText(hwnd,IDC_EDIT1,ONE,sizeof(ONE));
            GetDlgItemText(hwnd,IDC_EDIT2,TWO,sizeof(TWO));
            int ao = atof(ONE);
            int at = atof(TWO);
            int atr = ao + at;
            TCHAR thr[256];
            wsprintf(thr,L"%d",atr);
            SetDlgItemText(hwnd, IDC_EDIT3,thr);
        break;
    }
    case IDC_OK:
    {
        TCHAR ONE2[256], TWO2[256];
            GetDlgItemText(hwnd,IDC_EDIT4,ONE2,sizeof(ONE2));
            GetDlgItemText(hwnd,IDC_EDIT5,TWO2,sizeof(TWO2));
            int ao2 = atoi(ONE2);
            int at2 = atoi(TWO2);
            int atr2 = ao2 - at2;
            TCHAR thr2[256];
            wsprintf(thr2,L"%d",atr2);
            SetDlgItemText(hwnd, IDC_EDIT6,thr2);
        break;
    }

    default:
        break;
    }
}
void Main_Close(HWND hwnd)
{
    EndDialog(hwnd, 0);
}
Main.c：
#include "stdafx.h"
#include "Win32Project1.h"
#include"Resource.h"
#include<COMMCTRL.H>
#pragma comment(lib,"comctl32.lib")

int APIENTRY _tWinMain(HINSTANCE hInstance,
    HINSTANCE hPrevInstance,
    LPWSTR    lpCmdLine,
    int       nCmdShow)
{
    InitCommonControls();
    DialogBox(hPrevInstance, MAKEINTRESOURCE(IDD_MAIN), NULL, Main_Proc);
    return 0;
}
Win32Project1.h:
#pragma once

#include "resource.h"
#ifndef __WIN32PROJECT_H__
#define __WIN32PROJECT_H__





BOOL WINAPI Main_Proc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
BOOL Main_onlnicDialog(HWND hwnd, HWND hwndm, LPARAM lParam);
void Main_onCommand(HWND hwnd, int id, HWND hwndCTl, UINT codeNotify);
void Main_Close(HWND hwnd);
#endif

如果使用itoa怎么解决乱码问题？

第三个参数进制写10，字串长度留够就行了

不行