Hi all,
How to make only one instance of a application? For example using createwindowex....

thanx

Marcelo Sabino

I know it's a cliche, but google IS your friend. This is a gesture of good faith.

Ehtyar.

in fasm?

you can manually check running processes. if you are really concerned then you could do an integrity check on the executable file.

but what if someone changed a byte? obviously this doesn't work. however you can enforce your app to run only from a specific folder then on startup check running processes if any of the said has the same path.

the mutex one looks easy and sufficient enough

@marcelo.sabino: use a named MUTEX, like Ehtyar mentioned.