调用WINAPI 创建一个窗口并显示一些东西（create a window and display something）

本文通过一个简单的Windows程序示例，介绍了如何使用Windows API创建窗口、显示文本，并处理基本的消息循环。文章详细展示了创建窗口的过程，包括注册窗口类、创建窗口实例、显示窗口以及处理窗口消息。

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#include <windows.h>
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
	static TCHAR szAppName[] = TEXT ("HelloWin") ;
	HWND hwnd ;					//窗口句柄
	MSG msg;							//消息结构
	WNDCLASS wndclass ;    //窗口类别结构

	wndclass.style = CS_HREDRAW | CS_VREDRAW ; //设置窗体风格
	wndclass.lpfnWndProc = WndProc ;                        //指定窗口消息处理程序
	wndclass.cbClsExtra = 0 ;										//
	wndclass.cbWndExtra = 0 ;									
	wndclass.hInstance = hInstance ;							//执行实体句柄
	wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;//加载图标
	wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;//加载鼠标图标
	wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;	//设置窗口背景（颜色）
	wndclass.lpszMenuName = NULL ;						//窗体菜单名
	wndclass.lpszClassName = szAppName ;			//窗体名

	if (!RegisterClass (&wndclass))					//登记窗体
	{
		MessageBox ( NULL, TEXT ("This program requires Windows NT!"),
			szAppName, MB_ICONERROR) ;
		return 0 ;
	}

	hwnd = CreateWindow( szAppName,//windows classname
		TEXT ("The Hello Progame"), //window caption
		WS_OVERLAPPEDWINDOW,		//window style
		CW_USEDEFAULT,				//inital x position
		CW_USEDEFAULT,				//inital y position
		CW_USEDEFAULT,				//inital x size
		CW_USEDEFAULT,				//inital y size
		NULL,						//parent windows hadle
		NULL,						//windows menu handle
		hInstance,					//program instance handle
		NULL) ;						//creation paramenters
	ShowWindow(hwnd, iCmdShow) ;						//show the window
	UpdateWindow(hwnd) ;										//Update window itself
	
	while (GetMessage (&msg, NULL, 0, 0))				//Get a Message from window's message manage
	{
		TranslateMessage (&msg) ;							//Translate some message from keyboard
		DispatchMessage (&msg) ;								//Send massage to massage process program
	}
	return msg.wParam;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	HDC hdc;							//device contest handle
	PAINTSTRUCT ps;			//print struct
	RECT rect ;						//rect struct
	switch(message)
	{
	case WM_CREATE:					//if the window create,this function will accept this massage
													//(WM_CREATE)
		//PlaySound (TEXT ("hellowin.wav"), NULL, SND_FILENAME | SND_ASYNC) ;
		return 0;
	case WM_PAINT:						//window redraw
		hdc = BeginPaint (hwnd, &ps) ;			//begin paint window
		GetClientRect (hwnd, &rect);				//get rect of client 
		DrawText (hdc, TEXT ("Hello, Windows XP!"), -1, &rect,
			DT_SINGLELINE | DT_CENTER | DT_VCENTER) ;
		EndPaint (hwnd, &ps);			//draw the text in centre of window
		return 0 ;
	case WM_DESTROY:				//when the window destroy ,this function will accept this massage,then process it:
		PostQuitMessage (0);			//Quit the program
		return 0 ;
	}
	return DefWindowProc (hwnd, message, wParam, lParam);
}