c++窗口创造了,窗口关闭,进程仍在

c++窗口创建了,窗口关闭,进程仍在!

为什么窗口关闭了,在进程里面关掉! 求解!大神help!

#include <windows.h>

#include <stdio.h>


LRESULT CALLBACK WinMyProc(

	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 wndclass;

	wndclass.cbClsExtra=0;

	wndclass.cbWndExtra=0;

	wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_PEN);//BLACK_BRUSH

	wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);//IDC_CROSS

	wndclass.hIcon=LoadIcon(NULL,IDI_INFORMATION);//IDI_ERROR 

	wndclass.hInstance=hInstance;//当前实例的句柄

	wndclass.lpfnWndProc=WinMyProc;//窗口过程函数

	wndclass.lpszClassName="MyWindow";

	wndclass.lpszMenuName=NULL;

	wndclass.style=CS_HREDRAW | CS_VREDRAW;


	RegisterClass(&wndclass);//注册窗口类


	HWND hwnd;

	hwnd=CreateWindow(//创建窗口

		"MyWindow",

		"win32窗口程序!",

		WS_OVERLAPPEDWINDOW,

		500,//水平位置 CW_USEDEFAULT

		300,//垂直位置

		400,//窗口宽度

		300,//窗口高度

		NULL,

		NULL,

		hInstance,

		NULL);

	ShowWindow(hwnd,SW_SHOWNORMAL);

	UpdateWindow(hwnd);


	MSG msg;

	while(GetMessage(&msg,hwnd,0,0))

	{

		TranslateMessage(&msg);

		DispatchMessage(&msg);

	}

	return 0;

}

LRESULT CALLBACK WinMyProc(

	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 is %d",wParam);

			MessageBox(hwnd,szchar,"MyWindow",0);

			break;

		case WM_LBUTTONDOWN:

			MessageBox(hwnd,"鼠标点击了","MyWindow",MB_OK);

			HDC hdc;

			hdc=GetDC(hwnd);

			TextOut(hdc,0,50,"...我的win32窗口程序!",strlen("...我的win32窗口程序!"));

			ReleaseDC(hwnd,hdc);

			break;

		case WM_PAINT:

			HDC hDC;

			PAINTSTRUCT ps;

			hDC=BeginPaint(hwnd,&ps);

			TextOut(hDC,0,0,"我的win32窗口程序!",strlen("我的win32窗口程序!"));

			EndPaint(hwnd,&ps);

			break;

		case WM_CLOSE:

			if(IDYES==MessageBox(hwnd,"是否关闭窗口?","MyWindow",MB_YESNO))

			{

				DestroyWindow(hwnd);

			}

			break;

		case WM_DESTROY:

			PostQuitMessage(0);

			break;

		default:

			return DefWindowProc(hwnd,uMsg,wParam,lParam);

	}

	return 0;

}

------解决方案--------------------
 while(GetMessage(&msg,hwnd,0,0))
-->
    while(GetMessage(&msg,NULL,0,0))