Detect if an instance is running with kernel32::CreateMutexA
- by moz
Hello.
I'm working on an NSIS installer, and trying to check if a certain application is running before uninstalling. So, I use kernel32::CreateMutexA call. Here is the chunk:
System::Call 'kernel32::CreateMutexA(i 0, i 0, t "cmd.exe") i .r1 ?e'
Pop $R0
StrCmp $R0 0 +3
MessageBox MB_USERICON "The application is already running."
Abort
I put it into un.onInit. Trouble is, the process (cmd.exe here) is never detected.
Did I miss something?
Tx.