Mega Code Archive
Screencapture with animated gif support!
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Title: Screencapture with animated gif support!
Question: How to create a screenshot of the entire screen, a selection or a specific window to a bitmap, jpeg compressed or (animated) GIF file?
Answer:
In may last year i promised to create a component which could
take screenshots and save them in a gif image, and here it
FINALLY is. :)
This component can be used in ANY kind of application, royalty
free with only 1 demand: credits!
==============================================================
Description:
This component can create screenshots of the screen (or
portions of the screen).
You can set a region of what you want to "photograph" by
calling the function
= TtspScreenCapture.SetRegion(ARegion: TCaptureRegion)
After setting the region you must specify a capture mode.
there are 4 capturemodes:
- cmStillBitmap
- cmStillJPEG
- cmStillGIF
- cmMotionGIF
Now you can take a still image by calling the function
= TtspScreenCapture.GetStillImage: TCaptureResult;
According to the chosen capture mode you can access the
screenshot in the proper TGraphic object:
= TCaptureResult = record
VBitmap: TBitmap;
VJPEG: TJPEGImage;
VGIFImage: TGIFImage;
end;
With these objects you can save the images to wherever you want
them.
Motion gifs require a little different approach.
First you must set the capture mode to cmMotionGIF.
Accordingly you must set the interval in which a screenshot
should be taken by setting the property
= TtspScreenCapture.MotionGifInterval: integer
This property is in milliseconds. (1 second = 1000 millisecond)
Everything is now ready for capturing.
To activate the capturing set the property
= TtspScreenCapture.Active: boolean;
to true.
while capturing you can read the current GIFImage by calling the
function
= TtspScreenCapture.GetMotionGif: TGIFImage;
To stop capturing set the Active property back to false.
The final Gif image is again accesible by calling the function
GetMotionGIF.
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Benchmark:
The component also contains a function benchmark. this is a very simple
function which calculates how much frames can be captured in 10 seconds.
the result value is in captured frames per second (rounded).
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well, this wraps it up for now.
Good luck with using this component in your application!
Nevertheless i have 1 more thing to tell you:
1. DON'T forget to credit me in your application. You got this for free
so it would be quite fair to do this simple thing.
========================================================================
Have fun,
Christiaan ten Klooster
webmaster@tsp2000.tmfweb.nl
www.tsp2000.tmfweb.nl
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