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#1 Posted : Monday, October 27, 2008 10:35:46 AM(UTC)


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For this demo you will require Imaging Pro v16 toolkit and of the Multimedia v16 toolkit.  This demo shows you how to use the Video Callback filter and the Imaging Pro toolkit with COM Interop to take a still image and saving it out.  There are 2 reasons for using the Video Callback filter over the more simple GetStillDIB()/SaveStillDIB() method:

1.  If your card doesn't support GetStillDIB()/SaveStillDIB().
2.  You want to take a still while you are capturing the video.  (If you called StartCapture(ltmmCapture_Mode_Video) you cannot call GetStillDIB()/SaveStillDIB().)  With the Video Callback filter you can take a still while it's in video capture mode or if the capture has not been started.

This is a VB6 project, and you simply extract it and build the exe or run the project.  Once you have it running follow these steps:

1.  Select your video device and press the "Switch to Selected Device" button.
2.  Press the "Take Still" button.  You will be shown the still image to the right.
3.  Press the "Save Still Image" button to save it to file.  It will save it as a BMP, but you can modify the code to save it as any format supported.
File Attachment(s):
SimpleCallback.zip (4kb) downloaded 92 time(s).

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