Re: [Dev-C++] Detecting termination of a process

[<mr...@c2...>]

> We can run programs by using CreateProcess. I get the Process' handle
> from that call. And that handle I pass to GetExitCodeProcess. I then
> get the exit code of the Process. If the process has not yet
> terminated its termination status is STILL_ACTIVE. 
> 
> Question: If I was to run a process from my application and monitor
> it(detect if it is still running), how would I do it? 
> 
> Would it be that I'll have to create loop, checking the
> GetExitCodeProcess if ExitCode is STILL_ACTIVE or another value? Would
> this method imply performance issues (slower system run)? or is there
> another way to check if the process is still running? 

If you really need to know exactly when the process exits, you could 
set a hook to intercept the message queue of the process and look for 
the WM_DESTROY or WM_QUIT messages.

This requires that these messages are actually used in the process, 
though. If it's a process without a window proc it is not a good 
way...

If you take the hook route, it is also possible to send yourself a 
message when the hook DLL is detached from the process, but this is 
probably a bit cumbersome.

If your app will be doing nothing while the other process is running, 
I'd just sit in a loop, waiting for the process to exit.

If you are going to do other stuff concurrently, and need to know 
exactly when the process exits, I think maybe the hook route is the 
best way.

If you try any operations on the process handle, they will fail if 
the process has terminated, so that is also a way to test if the 
process is still running.


-=D8yvind

---------------------------------
mr...@c2... @ work