//问题，关于win32 application。程序退出以后，任务管理器中仍然有该程序进程。
//如何改进？
#include <windows.h>
#include <stdio.h>

LRESULT CALLBACK WinXuProc(
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;
wndcls.cbClsExtra=0;
wndcls.cbWndExtra=0;
wndcls.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);
wndcls.hCursor=LoadCursor(NULL,IDC_CROSS);
wndcls.hIcon=LoadIcon(NULL,IDI_ERROR);
wndcls.hInstance=hInstance;
wndcls.lpfnWndProc=WinXuProc;
wndcls.lpszClassName="WinXu";
wndcls.lpszMenuName=NULL;
wndcls.style=CS_HREDRAW | CS_VREDRAW;
RegisterClass(&wndcls);

HWND hwnd;
hwnd=CreateWindow("WinXu","中华人民共和国",WS_OVERLAPPEDWINDOW,0,0,800,600,NULL,NULL,hInstance,NULL);
ShowWindow(hwnd,SW_SHOWNORMAL);
UpdateWindow(hwnd);

MSG msg;
while(GetMessage(&msg,hwnd,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}

LRESULT CALLBACK WinXuProc(
HWND hwnd, // handle to window
UINT uMsg, // message identifier
WPARAM wParam, // first message parameter
LPARAM lParam // second message parameter
)
{
switch(uMsg)
{
case WM_PAINT:
HDC hdc;
PAINTSTRUCT ps;
hdc=BeginPaint(hwnd,&ps);
TextOut(hdc,0,0,"中华人民共和国",strlen("中华人民共和国"));
EndPaint(hwnd,&ps);
break;
case WM_LBUTTONDOWN:
MessageBox(hwnd,"mouse clicked","中华人民共和国",MB_OK);
HDC hdc2;
hdc2=GetDC(hwnd);
TextOut(hdc2,0,50,"中华人民共和国",strlen("中华人民共和国"));
ReleaseDC(hwnd,hdc2);
break;
case WM_CHAR:
char szChar[20];
sprintf(szChar,"char is %d",wParam);
MessageBox(hwnd,szChar,"中华人民共和国",MB_OK);
break;
case WM_CLOSE:
if(IDYES==MessageBox(hwnd,"really want to quit?","中华人民共和国",MB_YESNO))
{
DestroyWindow(hwnd);
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd,uMsg,wParam,lParam);
}
return 0;
}