求教，遇到问题，大神在哪里

#include <windows.h>
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrenInstance,LPSTR ipCmsLine,int nShowCmd)
{ HWND hwnd;
MSG msg;
WNDCLASS wndclass;
wndclass.style= CS_HREDRAW|CS_VREDRAW;
wndclass.lpfnWndProc=WndProc;
wndclass.cbClsExtra=0;
wndclass.cbWndExtra=0;
wndclass.hInstance=hInstance;
wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName=NULL;
wndclass.lpszClassName="HellowWin";
if(!RegisterClass(&wndclass)) return FALSE;
hwnd=CreateWindow("HelloWin",
"HelloWin",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL);
ShowWindow (hwnd, nShowCmd);
UpdateWindow(hwnd);
while(GetMessage(&msg,NULL,0,0))
{ TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM IParam)
{
switch (message)
{ case WM_PAINT:
HDC hdc;
PAINTSTRUCT ps;
hdc = BeginPaint(hwnd,&ps);
TextOut(hdc,10,20,"等我会写黑客了",28);
EndPaint(hwnd,&ps);
return 0 ;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd,message,wParam,IParam);
system("pause");
}

代码在上面。。。。

窗口类名写错了
hellowin自己看看用到了窗口类名的地方
至于有没有其他的就不知道了，手机无法调试