Determine if an application is not responding

Today, I saw two articles on MSN's core discussion group. The question is whether the application is unresponsive. The original text is as follows:

> How are it possible to determine a process is ' not responding ' like NT Task

> Manager do?

The heuristic works is for GUI processes, and consists of calling

SendMessageTimeout () with Smto_abortifhung.

>there are any APIs call to doing job, or this status is simply a deduction

>based on process counters, like so 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.

--

There is a rational reason. Of course, I also have a undocumented function here, but other solutions, NT and 9X have a USER32.DLL function, Ishungappwindow (NT) and Ishungthread (9X). It's easy to use. The following is a prototype.

BOOL Ishungappwindow (

HWND hwnd,//Handle to main app ' s window

);

BOOL Ishungthread (

DWORD dwThreadID,//The thread ' s identifier of the main app ' s window

);

With the prototype, even the explanation is not necessary, good not.:) However, the call requires GetProcAddress. The function is not in the library.