Thank you for you help regarding nsAString.  Now I will have a program to generate a video stream from a camera and should be able to extract individual frame (using MS DirectShow SDK).  I want to ask a XUL element to play the video in real time as it is captured.  I don't want to write the image to a file on hard disk then set the src attribute to that file.  One of the ideas is to set scr=http://........../...exe or dll?, the EXE or DLL will send the image just generated to local web server who will forward it to the XUL element.  Is there any other way to do it?
 
Thank you,
 
Michael

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