不好意思，这个也不能执行，差在哪？
#include <windows.h>
#include <stdlib.h>
#include <string.h>
long WINAPI WndProc(HWND,UINT,UINT,LONG);
BOOL InitWindowsClass(HINSTANCE);
BOOL InitWindows(HINSTANCE,int);
HWND hwndmain;
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{
MSG message;
if(!InitWindowsClass(hInstance))
return FALSE;
if(!InitWindows(hInstance,nCmdShow))
return FALSE;
while(GetMessage(&message,0,0,0))
{
TranslateMessage(&message);
DispatchMessage(&message);
}
return message.wParam;
}

long WINAPI WndProc(HWND hwnd,UINT iMessage,UINT wParam,LONG lParam)
{
HDC hDC;
HBRUSH hBrush;
HPEN hPen;
PAINTSTRUCT PtStr;
POINT points[6]={{100,212},{70,222},{70,250},{130,250},{130,227},{100,212}};

switch(iMessage)
{
case WM_PAINT:
hDC=BeginPaint(hwnd,&PtStr);
hPen=(HPEN)GetStockObject(NULL_PEN);
SelectObject(hDC,hPen);
hBrush=(HBRUSH)GetStockObject(BLACK_BRUSH);
SelectObject(hDC,hBrush);
LineTo(hDC,50,50);
DeleteObject(hPen);
hPen=CreatePen(PS_SOLID,2,RGB(255,0,0));
SelectObject(hDC,hPen);
LineTo(hDC,150,50);
LineTo(hDC,100,137);
LineTo(hDC,50,50);

Polyline(hDC,points,6);
Arc(hDC,63,137,138,212,100,137,100,137);
Pie(hDC,213,137,288,212,240,137,260,137);
Rectangle(hDC,213,212,287,250);
RoundRect(hDC,213,100,287,137,20,20);
DeleteObject(hPen);
DeleteObject(hBrush);
EndPaint(hwnd,&PtStr);
return 0;

case WM_DESTROY:
PostQuitMessage(0);
return 0;
default:
return DefWindowProc(hwnd,iMessage,wParam,lParam);
}
}

BOOL InitWindows(HINSTANCE hInstance,int nCmdShow)
{
HWND hwnd;
hwnd=CreateWindow("WinFill","填充示例程序",WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,0,CW_USEDEFAULT,0,NULL,NULL,hInstance,NULL);
if(!hwnd)
return FALSE;
hwndmain=hwnd;
ShowWindow(hwnd,nCmdShow);
UpdateWindow(hwnd);
return TRUE;
}

BOOL InitWindowsClass(HINSTANCE hInstance)
{
WNDCLASS wndclass;
wndclass.cbClsExtra=0;
wndclass.cbWndExtra=0;
wndclass.hbrBackground=(HBRUSH)(GetStockObject(WHITE_BRUSH));
wndclass.hCursor=LoadIcon(NULL,"END");
wndclass.hInstance=hInstance;
wndclass.lpfnWndProc=WndProc;
wndclass.lpszClassName="WinFill";
wndclass.lpszMenuName=NULL;
wndclass.style=CS_HREDRAW|CS_VREDRAW;
return RegisterClass(&wndclass);
}