Question

I have a Delphi 6 application that works with the Skype API. I want to know when the Skype client has shut down even though my software did not launch it (so I don’t have a process handle for it). This way I can know if the user shut down the Skype client I can get the process ID for the Skype client fairly easily, so is there a Windows API call or other technique that accepts a process ID where I can get a notification when the process (Skype client) has terminated?

If not, is there a WinApi call that I can use to poll Windows to see if the process ID is still valid, or does Windows reuse process IDs so there’s a chance that I could end up with a process ID belonging to a recently launched process that is not the Skype client, which would invalidate my polling efforts?

Answer 1

Call OpenProcess to get a process handle. The SYNCHRONIZE access right will probably be enough. Then wait on the handle. Something like:

HANDLE hProcess = OpenProcess(SYNCHRONIZE, FALSE, pid);
WaitForSingleObject(hProcess, INFINITE);
CloseHandle(hProcess);