我有一个应用程序,我想在Windows关闭(或用户注销)时正常关闭。这曾经工作过(在xp中),但在去年的某个时候它没有人注意到。在Windows 7下它也破坏了(但不同)。
我们的产品有一个主进程(server.exe),可启动许多其他进程。正常关闭会让server.exe询问它开始关闭的所有进程。但是,当我调试此代码时,似乎其他进程已经终止。我们的主进程(server.exe)是处理WM_QUERYENDSESSION和WM_ENDSESSION消息的唯一进程。下面的代码(这曾经在XP下工作但不再有):
LRESULT CALLBACK master_wnd_proc
(
HWND hwnd, /* (in) handle to window */
UINT uMsg, /* (in) message identifier */
WPARAM wParam, /* (in) first message parameter */
LPARAM lParam /* (in) second message parameter */
)
{
LRESULT result; /* return value */
long msg_code;
switch (uMsg)
{
case WM_ENDSESSION:
if (wParam)
{
msg_code = PCS_WINDOWS_SHUTDOWN;
if( lParam & 0x01L )
msg_code = WINDOWS_SHUT_CLOSE;
if( lParam & 0x40000000L )
msg_code = WINDOWS_SHUT_CRIT;
if( (unsigned long)lParam & 0x80000000 )
msg_code = WINDOWS_SHUT_LOGOFF;
MsgGenerate(msg_code, MSG_SEVERE, MSG_LOG, "");
ipc_declare_shutdown( msg_code );
//We need one more message in the message queue
//to force the message loop, below, to exit.
PostQuitMessage(EXIT_SUCCESS);
/* WARNING: Don't call MsgGenerate() after this point! */
}
result = 0;
break;
case WM_QUERYENDSESSION:
/* return TRUE to say "okay to shutdown"
* If FALSE is returned, then other processes are not stopped
* and the session isn't ended.
*/
result = TRUE;
break;
/* for a Windows TIMER or for an IPC prompt, handle
* the old server code and tcall messages and
* once-per-second work. Notice that the
* once-per-second work could just be done on the WM_TIMER
* and the tcall work could just be done on the WM_APP_IPC_POSTED
* but I've merged them together here. The merge isn't
* necessary to fix a bug or anything, but rather to
* make the code more robust in the face of unexpected
* conditions.
*/
case WM_TIMER:
case WM_APP_IPC_POSTED:
/* now handle tcall messages */
(void) server();
result = FALSE;
break;
default:
result = DefWindowProc (hwnd, uMsg, wParam, lParam);
break;
}
return result;
}
似乎我们在去年改变了一些东西,需要所有子进程来处理WM_QUERYENDSESSION消息(我真的想避免这种情况)。我似乎无法找到任何关于进程何时收到或未收到此消息的信息。
我已经使用新的API在Windows 7下工作,但是想知道为什么它在XP下崩溃所以我可以找到一个适用于这两种操作系统的解决方案。
任何帮助?
答案 0 :(得分:3)
在Vista时代发生了变化,不太确定这会对你的代码产生什么影响。最好的办法是不要将它留给Windows来确定关机顺序。只需要让它让您的服务器在帮助程序进程之前获得关闭通知:
DWORD dwLevel, dwFlags;
BOOL fOkay = GetProcessShutdownParameters(&dwLevel, &dwFlags);
ASSERT(fOkay);
if (fOkay && dwLevel > 0x100) {
fOkay = SetProcessShutdownParameters(dwLevel + 1, SHUTDOWN_NORETRY);
ASSERT(fOkay);
}