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I need to draw a ROI by mouse click and mouse move using cpp in mfc

What I have tried:

i have gone through the mouse click. i am new to this so dont know much about this
Updated 7-Dec-22 23:31pm
11917640 Member 8-Dec-22 3:52am    
What is "free ROI"? Non-rectangle?
Member 15717738 13-Dec-22 0:10am    
can draw any shape
11917640 Member 8-Dec-22 3:54am    
For rectangle ROI. Fast solution: using DrawFocusRect API. For full solution, see DrawCli MFC code sample.

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