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[TrajanoCosta]

Hi all. I am new in OTL and multithreading.

I want to create a dll with a vcl component to capture frames from the webcam. In the dll I create the instance of visual component and assign a callback funtion for the event in frame captures.
Something like this:

type tframegrabberevent = procedure (bmp : Tbitmap); stdcall;

var FG : TFrameGrabber;
     Fframe : tframegrabberevent

...

FG := TFrameGrabber.create(nil);

FG.onframegrabber = Fframe.

When a call the dll from a application I assign the Fframe to a function in the application to receive the bitmap!

That's all

My question is: Can I use OTL to start the process in dll in a multitask way, in a thread different of application? and yet communicate a function address (callback) betwen app and dll?

I thank to all for any response.

[Primoz Gabrijelcic]

Sorry, you got me there - I've never used OTL in a DLL.

A short answer would be - if a TThread-based version would work in you scenario, OTL-based version should also work as they use identical mechanisms.

[TrajanoCosta]

I will try and post the results here.

Thank you!