Eyedropper OS X, win

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Hi there! Does someone know how to implement EyeDropper without a transparent window?
Please suggest.
How to prevent losing window's focus? How to get pixel from Screen on OS X. For example, on WinAPI I can use GetPixel.

I am using c++, Qt.

Thank you, very match !!!!!

What I have tried:

On OS X I tried to use CGWindowListCreateImage, but it also grabs cursor.
I suppose on WinApi I should use SetHook.

Posted 23-Apr-18 3:37am

Member 13675690

Updated 24-Apr-18 1:01am

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KarstenK · Answer 1 · 2018-04-24T01:02:00

The coding should be similar than in that Q & A on Stackoverflow.

Access to the pixel you get with CGBitmapContextGetData. Read also for further information about the API.

For that you need to draw the image in an own context.

C++

UIGraphicsBeginImageContextWithOptions(rc.size, true, 1.0);
CGContextRef context = UIGraphicsGetCurrentContext();

CGContextSetFillColorWithColor(context, [[UIColor whiteColor] CGColor]);
CGContextFillRect(context, rc);

[image drawAtPoint:CGPointMake(-rc.origin.x, -rc.origin.y)];

// here you have pixel access
BYTE *data = CGBitmapContextGetData(context);/* 4 for A, R, G, B */
//clean up
UIGraphicsEndImageContext();