Windoows窗口程序三

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <windows.h>

HINSTANCE g_hInstance=;

//主窗口处理函数
LRESULT WndProc(HWND hWnd,UINT nMsg,WPARAM wParam,LPARAM lParam)
{
    switch(nMsg)
    {
        case WM_DESTROY:
            PostQuitMessage();
            break;
        default:
            break;
    }
    return DefWindowProc(hWnd,nMsg,wParam,lParam);
}

//注册窗口类
BOOL Register(LPSTR lpClassName,WNDPROC wndproc)
{
    WNDCLASSEX wce={};
    wce.cbSize=sizeof(wce);
    wce.cbClsExtra=;
    wce.cbWndExtra=;
    wce.hbrBackground=(HBRUSH)(COLOR_WINDOW+);
    wce.hCursor=NULL;
    wce.hIcon=NULL;
    wce.hIconSm=NULL;
    wce.hInstance=g_hInstance;
    wce.lpfnWndProc=wndproc;
    wce.lpszClassName=lpClassName;
    wce.lpszMenuName=NULL;
    wce.style=CS_HREDRAW|CS_VREDRAW;
    ATOM nAtom=RegisterClassEx(&wce);
    if(nAtom==)
    {
        return FALSE;
    }
    return TRUE;
}

//创建主窗口
HWND CreateMain(LPSTR lpClassName,LPSTR lpWndName)
{
    HWND hWnd=CreateWindowEx(,lpClassName,lpWndName,WS_OVERLAPPEDWINDOW,
    CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,g_hInstance,NULL);
    return hWnd;
}

//显示窗口
void Display(HWND hWnd)
{
    ShowWindow(hWnd,SW_SHOW);
    UpdateWindow(hWnd);
}

//消息循环
void Message()
{
    MSG nMsg={};
    while(GetMessage(&nMsg,NULL,,))
    {
        TranslateMessage(&nMsg);
        DispatchMessage(&nMsg);
    }
}

int WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{
    g_hInstance=hInstance;
    if(!Register("Main",(WNDPROC)WndProc))
    {
        MessageBox(NULL,"注册失败","error",MB_OK);
        return -;
    }
    HWND hWnd=CreateMain("Main","window");
    Display(hWnd);
    Message();
    return ;
}