Invalid Number of parameters in CreateMutex

[pix_programmer]

Hi! I'm trying to restrict my exe to only one at any time. I've used the following code:

var
Mutex : THandle;

Mutex := CreateMutex(nil,False,'MyMutexName');

I got the following error in CreateMutex: 'Invalid Number of Parameters". How to create a Mutex in Delphi?

[smags13]

What version of Delphi are you using? It looks fine to me. Try

Mutex:= Windows.CreateMutex(Nil, False, 'MyMutexName');

And see what happens