求帮忙，为下面的简单程序贴一个图

#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<Windows.h>
#include<stdio.h>
using namespace std;

LRESULT CALLBACK WinProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrewInstance, LPSTR lpCmdLine, int nCmdShow)
{
    WNDCLASS wndclass;//定义窗口类对象
    //WNDPROC
    static LPCTSTR szAppName = (LPCTSTR)"weixin";   
    wndclass.hbrBackground
        = (HBRUSH)GetStockObject(DKGRAY_BRUSH);
    wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
    wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wndclass.hInstance = hInstance;      
    wndclass.lpfnWndProc = WinProc;
    wndclass.lpszClassName = szAppName;
    wndclass.lpszMenuName = NULL;
    wndclass.style = CS_HREDRAW | CS_VREDRAW;
    wndclass.cbClsExtra = 0;
    wndclass.cbWndExtra = 0;
    RegisterClass(&wndclass);

    HWND hwnd;
    hwnd = CreateWindow(szAppName,
        L"窗口标题",    WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT, CW_USEDEFAULT, NULL,    NULL,
        hInstance,
        NULL);
   
    ShowWindow(hwnd, SW_SHOWNORMAL        );
    UpdateWindow(hwnd);      

    //消息循环
    MSG msg;
    while (GetMessage(&msg,NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);   
    }
    return static_cast<int>(msg.wParam);
}

//消息处理函数，窗口过程函数
LRESULT CALLBACK WinProc(HWND hwnd,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
    HDC hdc;
    PAINTSTRUCT ps;
    switch(uMsg)
    {
    case WM_PAINT:
        hdc = BeginPaint(hwnd, &ps);
        EndPaint(hwnd, &ps);
        break;
    case WM_CLOSE:
        if(IDYES == MessageBox(hwnd, L"你是否退出程序?", L"winxin", MB_YESNO))
        {
            DestroyWindow(hwnd);
        }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd, uMsg, wParam, lParam);
    }
    return 0;
}

[此贴子已经被作者于2017-6-1 15:44编辑过]