初学VC++ 写了一段代码，编译没问题，但不能显示窗休？

代码如下：
long WINAPI WndProc(HWND, UINT, WPARAM, LPARAM);
BOOL InitWindowsClass(HINSTANCE hInstance);
BOOL InitWindows(HINSTANCE hInstance, int nCmdShow);

HWND hWndMain;

int WINAPI WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
// TODO: Place code here.
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;
}

BOOL InitWindowsClass(HINSTANCE hInstance)
{
WNDCLASS WndClass;
WndClass.cbClsExtra = 0;
WndClass.cbWndExtra = 0;
WndClass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
WndClass.hCursor = LoadCursor(NULL, IDC

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

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

int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{
WNDCLASS WndClass;
WndClass.cbClsExtra = 0;
WndClass.cbWndExtra = 0;
WndClass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
WndClass.hCursor = LoadCursor(NULL,IDC_ARROW);
WndClass.hIcon = LoadIcon(NULL,IDI_APPLICATION); //出错,将END改为IDI_APPLICATION
WndClass.hInstance = hInstance;
WndClass.lpfnWndProc = WndProc;
WndClass.lpszClassName = "WinFill";
WndClass.lpszMenuName = NULL;
WndClass.style = CS_HREDRAW|CS_VREDRAW;
RegisterClass(&WndClass);

HWND hWnd;
hWnd = CreateWindow("WinFill", //将WndFill改为WinFill
"填充示例程序",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
0,