请问一下这段代码那里错了？
#include<windows.h>
#include<stdio.h>

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



int WINAPI WinMain
(
HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow
)
{
    WNDCLASS wndcls;
    wndcls.cbClsExtra=0;
    wndcls.cbWndExtra=0;
    wndcls.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);
    wndcls.hCursor=LoadCursor(NULL.IDC.CROSS);
    wndcls.hInstance=hInstance;
    wndcls.lpfnWndproc=WinSunproc;
    wndcls.lpszClassNane="weixin2003";
    wndcls.lpszMenuName=NULL;
    wndcls.style=CS_HREDRAW | cs_VREDRAW;
    RegisterClass(&wndcls);

    HWND hwnd;
    hwnd=CreateWindow("weixin2003","bei jing weixinkexue jishu pei xin zhongxin",WS_OVERLAPPEDWINDOW,
    0,0,600,400,NULL,hInstance,NULL);

    ShowWindow(hwnd,SW_SHOWNORMAL);
    UpdateWindow(hwnd);

    MSG msg;
    while(GetMessage(&msg,NULL,0,0))
    {
        translateMessage(&msg);
        DispatchMessage(&msg);

    }
    return 0;

}

LRESULT CALLBACK WinSunProc(
  HWND hwnd,
  UINT uMsg,
  WPARAM wParam,
  LPARAM lParam
);
{
    switch(uMsg);
    {
    case WM_CHAR:
        char szChar[20];
        sprintf(szChar,"char is %d",wParam);
        MessageBox(hwnd,szChar,"weixin",0);
        break;
    case WM_LBUTTONDOWN:
        MessageBox(hwnd,"mouse clicked","weixin",0);
        HDC hdc;
        hdc=GetDC(hwnd);
        TextOut(hdc,0,50,"ji suan ji yu yan pei xun",strlen("ji suan ji yu yan pei xun"));
        REleaseDC(hwnd,hdc);

        break;
    case WM_PAINT:
        HDC hDC;
        PAINTSTRUCT ps;
        hDC=BeginPaint(hwnd,&ps);
        TextOut(hDC,0,0,"wei xin pei xun",strlen("wei xin pei xun"));
        EndPaint(hwnd,&ps);
        break;
    case WM_CLOSE:
        if(IDYES==MessageBox(hwnd,"shi fou zhen de jie shu?","weixin",MB_YESNO))
        {
            Destroywindow(hwnd);
        }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd,uMsg,wParam,lParam);


    }
    return 0;

}

Winsunpron在入口过程那个p应该是大写
这种原始方法建立win32窗口你是不会喜欢的，message的句柄可以用null不然你程序假死你就被ko了

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

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



int WINAPI WinMain
(
HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow
)
{
    WNDCLASS wndcls;
    wndcls.cbClsExtra=0;
    wndcls.cbWndExtra=0;
    wndcls.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);
    wndcls.hCursor=LoadCursor(NULL, IDC_ARROW);//逗号啊～
    wndcls.hInstance=hInstance;
    wndcls.lpfnWndProc=WinSunProc;//成员大小写还有你的消息泵大小写
    wndcls.lpszClassName="weixin2003";//成员名字都打错了M打成N
    wndcls.lpszMenuName=NULL;
    wndcls.style=CS_HREDRAW | CS_VREDRAW;// 注册窗口样式是大写啊！！！
    RegisterClass(&wndcls);

    HWND hwnd;
    hwnd=CreateWindowEx(0,"weixin2003","bei jing weixinkexue jishu pei xin zhongxin",WS_OVERLAPPEDWINDOW,
    CW_USEDEFAULT,CW_USEDEFAULT,600,400,HWND_DESKTOP,NULL,hInstance,NULL);
    //我帮你换成Ex加强版了

    ShowWindow(hwnd,SW_SHOWNORMAL);
    UpdateWindow(hwnd);

    MSG msg;
    while(GetMessage(&msg,NULL,0,0))
    {
        TranslateMessage(&msg);//大小写！
        DispatchMessage(&msg);

    }
    return 0;

}

LRESULT CALLBACK WinSunProc(
  HWND hwnd,
  UINT uMsg,
  WPARAM wParam,
  LPARAM lParam
)//复制粘贴的？为嘛还要加冒号
{
    switch(uMsg)// 为嘛还要加冒号
    {
    case WM_CHAR:
        char szChar[20];
        sprintf(szChar,"char is %d",wParam);
        MessageBox(hwnd,szChar,"weixin",0);
        break;
    case WM_LBUTTONDOWN:
        MessageBox(hwnd,"mouse clicked","weixin",0);
        HDC hdc;
        hdc=GetDC(hwnd);
        TextOut(hdc,0,50,"ji suan ji yu yan pei xun",strlen("ji suan ji yu yan pei xun"));
        //REleaseDC(hwnd,hdc);

        break;
    case WM_PAINT:
        HDC hDC;
        PAINTSTRUCT ps;
        hDC=BeginPaint(hwnd,&ps);
        TextOut(hDC,0,0,"wei xin pei xun",strlen("wei xin pei xun"));
        EndPaint(hwnd,&ps);
        break;
    case WM_CLOSE:
        if(IDYES==MessageBox(hwnd,"shi fou zhen de jie shu?","weixin",MB_YESNO))
        {
            PostQuitMessage (0);//Destroywindow(hwnd);
        }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd,uMsg,wParam,lParam);


    }
    return 0;

}

你知道你有多少个错误吗？

不知道还请高手多多指教