确定一个应用程序是否没有响应

作者:陆麟
转载请征得作者同意.
1999.10.21



今天在MSN的核心讨论组上看到两篇文章.讨论的乃是应用程序是否没有响应.原文如下:
From: Tomas Restrepo <tomasr@mvps.org>
Subject: Re: Process Not Responding HELP!
Date: Wednesday, October 20, 1999 10:55 AM

Augusto,
> How is it possible to determine a process is "not responding" like NT Task
> Manager do?

The heuristic works only for GUI processes, and consists of calling
SendMessageTimeOut() with SMTO_ABORTIFHUNG.

From: Bob Moore <bobm@mvps.org>
Subject: Re: Process Not Responding HELP!
Date: Wednesday, October 20, 1999 11:27 AM

On Wed, 20 Oct 1999 16:44:39 +0200, Augusto Stefanelli wrote:

>There is any API call to do the job, or this status is simply a deduction
>based on process counters, like that returned from call to GetProcessTimes
>API function?

Use SendMessageTimeout with a value of WM_NULL. That's all Task
Manager does to determine this AFAIK.

--
有理有理.当然,我这里还有一个UNDOCUMENTED函数,乃是其他的解决方案,NT和9X有个USER32.DLL的函数,IsHungAppWindow(NT)和IsHungThread(9X).使用起来简便无比.下面给出原型.
BOOL IsHungAppWindow (
    HWND hWnd,    // handle to main app's window
);

BOOL IsHungThread (
     DWORD dwThreadId, // The thread's identifier of the  main app's window
);
有了原型,连解释都不需要,好得不的了.:)不过调用时需要GetProcAddress.库里没有该函数.