一个简单的Windows下 HelloWorld 出错

开始学习Windows API编程第一个程序出错 情赐教！

#include <windows.h>



long FAR PASCAL MainWndProc(HWND , unsigned, WORD, LONG);



HWND hWnd;



HBRUSH hBrush;



int  PASCAL WinMain(HANDLE hInstance, HANDLE hPreInstance,

		LPSTR lpCmdLine, int nCmdShow)

{

	MSG Message;

	if(!hPreInstance)

		if(!initApplication(hPreInstance))

			return FALSE;

	

	if(!initInstance(hInstance, nCmdShow))

		return FALSE;

	

	while(GetMessage(&Message, NULL, NULL, NULL))

	{

		TranslateMessage(&Message);

		DispatchMessageA(&Message);

	}



	return (Message.wParam);

}



BOOL initApplication(HANDLE hInstance)

{

	WNDCLASS WndClass;

	

	WndClass.style = CS_HREDRAW; //| CS_VERDRAW;

	WndClass.lpfnWndProc = MainWndProc;

	WndClass.cbClsExtra = 0;

	WndClass.cbWndExtra = 0;

	WndClass.hInstance = hInstance;

	WndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);

	WndClass.hCursor = LoadCursor(NULL, IDC_ARROW);

	WndClass.hbrBackground = GetStockObject(WHITE_BRUSH);

	WndClass.lpszMenuName = NULL;

	WndClass.lpszClassName = "Simple App";

	

	return RegisterClass(&WndClass);

}



BOOL initInstance(HANDLE hInstance, int nCmdShow)

{

	hWnd = CreateWindow(

			"Simple App",

			"Simple Application",

			WS_OVERLAPPEDWINDOW,

			CW_USEDEFAULT,

			CW_USEDEFAULT,

			CW_USEDEFAULT,

			CW_USEDEFAULT,

			NULL,

			NULL,

			hInstance,

			NULL

			);

	if(!hWnd)

		return FALSE;

	ShowWindow(hWnd, nCmdShow);

	UpdateWindow(hWnd);

	return TRUE;

}



long FAR PASCAL MainWndProc(HWND hWnd, unsigned message, WORD wParam, LONG lParam)

{

	HDC hDC;

	PAINTSTRUCT ps;

	

	switch(message)

	{

	case WM_CREATE:

		hBrush = CreateSolidBrush(RGB(255, 100, 0));

	break;

	

	case WM_PAINT:

		hDC = BeginPaint(hWnd, &ps);

		SelectObject(hDC, hBrush);

		Rectangle(hDC, 10, 20, 160, 180);

		TextOut(hDC, 30, 50, "Hello World", 13);

		EndPaint(hWnd, &ps);

	break;

	

	case WM_CLOSE:

		DestroyWindow(hWnd);

	break;

	

	case WM_DESTROY:

		DeleteObject(hBrush);

		PostQuitMessage(0);

	break;

	

	default:

		return (DefWindowProc(hWnd, message, wParam, lParam));

	}

	return (NULL);

}

===============================================================
error: conflicting types for 'WinMain'
C:/MinGW/bin/../lib/gcc/mingw32/3.4.5/../../../../include/winbase.h:1096: error: previous declaration of 'WinMain' was here
..\WndC.c:11: error: conflicting types for 'WinMain'
C:/MinGW/bin/../lib/gcc/mingw32/3.4.5/../../../../include/winbase.h:1096: error: previous declaration of 'WinMain' was here