The Videowindow dspack control on how to obtain the dynamic video, in which the line drawing,
There is no can draw lines, while reading video but once read after the video camera image, can't draw lines, on which the so forget to recognize give guidance

CodePudding user response:

In the window when playing video, equivalent to above shows more Zhang Lianxu images, each show after a refresh display again after the next,
Refresh will lead to draw lines disappear, you can see if the control is an event, such as OnPaint, inside painting, if not,
The need to capture the WM_PAINT message, painting in processing function,