win32 application 工程下的简单图形的程序执行不出来结果，编译已经通过，但运行的时候什么也没出来，另外在网上查了一下也没查到相关的问题解决，代码如下：
#include"windows.h"
#include"stdlib.h"
#include"string.h"

long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG lParam);

BOOL InitWindowsClass(HINSTANCE hInstance);

BOOL InitWindows(HINSTANCE hInstance,int nCmdShow);

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},{70,227},{70,250},{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,150,150);
        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);
}
    编译是可以通过的，平台是微软的那个VC++6.0，小弟刚刚开始学VC，请各位高手们指教啊.

sample中有示例代码啊

你还没有给窗口类一个图标呢

    WndClass.hIcon = LoadIcon (NULL, IDI_APPLICATION);

谢谢楼上的两位高手了啊

但我运行出来的时候，在多边形的一个端点多出来一条和原点相连的直线，考虑许久，始终想不明白是怎么回事儿，而这条直线并不是计划中要画进去的，请各位高手指教啊。