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pool

Joined: 08 Jan 2007
Posts: 97

pool 28 Aug 2012, 23:20

Last edited by pool on 17 Mar 2013, 12:11; edited 1 time in total

28 Aug 2012, 23:20

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20303
Location: In your JS exploiting you and your system

revolution 29 Aug 2012, 00:19

You could use a mutex in your program to detect if an instance is already in use.

BTW: What do you mean by "fastest"?

29 Aug 2012, 00:19

f0dder

Joined: 19 Feb 2004
Posts: 3175
Location: Denmark

f0dder 29 Aug 2012, 07:20

What to do really depends on your needs.

Are you trying to be sneaky, or do you just want the best non-sneaky way to do it? You'll also have to consider if you want to allow one instance per *machine*, or per *user* - keep in mind that there's something called Terminal Services Smile

29 Aug 2012, 07:20

pool

Joined: 08 Jan 2007
Posts: 97

pool 29 Aug 2012, 08:27

Last edited by pool on 17 Mar 2013, 12:11; edited 1 time in total

29 Aug 2012, 08:27

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20303
Location: In your JS exploiting you and your system

revolution 29 Aug 2012, 08:32

pool wrote:

Fastest. I mean I don't need functions that uses search methods.

We don't really have any reliable way to determine which OS functions use search and which don't. It could be that a mutex call does more searching than your Process32Next calls. And different versions of the OS might use different methods. My suggestion is that if your program is so fragile that the time taken to find another running exe could make or break it then you are doing something very wrong.

29 Aug 2012, 08:32

pool

Joined: 08 Jan 2007
Posts: 97

pool 29 Aug 2012, 08:42

Last edited by pool on 17 Mar 2013, 12:11; edited 1 time in total

29 Aug 2012, 08:42

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20303
Location: In your JS exploiting you and your system

revolution 29 Aug 2012, 08:44

pool wrote:

I'm actually using a named file mapping object on each exe. If happen when the other exe fail then it's named file mapping object is also invalid and its memory pointer. So to access it again I'm gonna execute that exe again to have the file mapped object again.

Perhaps WaitForMultipleObjects will suit your purpose. You can wait on multiple process handles and detect when one closes.

29 Aug 2012, 08:44

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