How to Get Active Process Name in C#? -

how active process name in c#?

i know must use code:

[dllimport("user32.dll")] private static extern intptr getforegroundwindow(); 

but don't know how use it.

as mentioned in this answer, have use getwindowthreadprocessid() process id window , can use process:

[dllimport("user32.dll")] public static extern intptr getwindowthreadprocessid(intptr hwnd, out uint processid);  [dllimport("user32.dll")] private static extern intptr getforegroundwindow();  string getactiveprocessfilename() {     intptr hwnd = getforegroundwindow();     uint pid;     getwindowthreadprocessid(hwnd, out pid);     process p = process.getprocessbyid((int)pid);     p.mainmodule.filename.dump(); } 

be aware seems throw exception (“a 32 bit processes cannot access modules of 64 bit process”) when run 32-bit application when active process 64-bit.

edit: damien pointed out, code prone race conditions, because process had active window @ time when getforegroundwindow() called might not exist anymore when getwindowthreadprocessid() called. worse situation if same hwnd assigned window @ time, guess should rare.