我的第一个VC++程序

#include <windows.h>
#include <stdio.h>

LRESULT CALLBACK WinSunProc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
);

int WINAPI WinMain(
  HINSTANCE hInstance,  // handle to current instance
  HINSTANCE hPrevInstance,  // handle to previous instance
  LPSTR lpCmdLine,      // pointer to command line
  int nCmdShow          // show state of window
)
{
	WNDCLASS wndcls;  //设计一个窗口类；

	wndcls.cbClsExtra = 0;
	wndcls.cbWndExtra = 0;
	wndcls.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
	wndcls.hIcon = LoadIcon(NULL,IDI_ERROR);
	wndcls.hCursor = LoadCursor(NULL,IDC_CROSS);
	wndcls.hInstance = hInstance;
	wndcls.lpfnWndProc = WinSunProc;
	wndcls.lpszClassName = "APPLICATION";
	wndcls.lpszMenuName =NULL;
	wndcls.style = CS_HREDRAW | CS_VREDRAW;

//////////////////////////////////////////////////////////////////////////
	RegisterClass(&wndcls);   //注册窗口；

//////////////////////////////////////////////////////////////////////////
HWND hwnd;
hwnd = CreateWindow("APPLICATION","http://http://www.baidu.com",  //创建一个窗口；
					WS_OVERLAPPEDWINDOW, 0, 0, 600,400,NULL,
					NULL,hInstance, NULL);
	
ShowWindow(hwnd, SW_SHOWNORMAL);
UpdateWindow(hwnd);
//////////////////////////////////////////////////////////////////////////
MSG msg;

while(GetMessage(&msg, NULL, 0,0))   //消息循环
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
return msg.wParam;
}

LRESULT CALLBACK WinSunProc(
  HWND hwnd,      // handle to window
  UINT uMsg,      // message identifier
  WPARAM wParam,  // first message parameter
  LPARAM lParam   // second message parameter
)
{
	switch(uMsg)
	{
	case WM_CHAR:
		char szChar[20];
		sprintf(szChar, "char code is %d ",wParam);
		MessageBox(hwnd, szChar, "char", 0);
		break;
	case WM_LBUTTONDOWN:
		MessageBox(hwnd, "mouse clicked", "message", 0);
		HDC hdc;
		hdc = GetDC(hwnd);
		TextOut(hdc, 0, 50, "博客园", strlen("博客园"));
		break;
	case WM_PAINT:
		HDC hDC;
		PAINTSTRUCT ps;
		hDC = BeginPaint(hwnd, &ps);
		TextOut(hDC, 0, 0, "http://www.baidu.com", strlen("http://www.baidu.com"));
		EndPaint(hwnd, &ps);
		break;
	case WM_CLOSE:
		if(IDYES == MessageBox(hwnd, "真的要退出吗？", "message", MB_YESNO))
		{
			DestroyWindow(hwnd);
		}
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return DefWindowProc(hwnd, uMsg, wParam, lParam);
	}
return 0;
	
}