java.lang.NullPointerException: Pointer address of argument 3 is NULL on org.bytedeco.opencv.global.opencv_imgproc.rectangle

[4714407]

The following code runs with an NullPointerException

rectangle(frame,
                                new Point(result.x, result.y),
                                new Point(result.x + result.width, result.y + result.height),
                                Scalar.MAGENTA, 2, LINE_8, 0);

java.lang.NullPointerException: Pointer address of argument 3 is NULL.
at org.bytedeco.opencv.global.opencv_imgproc.rectangle(Native Method) ~[opencv-4.4.0-1.5.4.jar:4.4.0-1.5.4]

argument 3 isScalar.MAGENTA，What did I write wrong?

[saudet]

That should be fixed with commit bytedeco/javacpp-presets@7f05222
Please give it a try with the snapshots: http://bytedeco.org/builds/
Thanks for reporting!

[4714407]

This is what I write now:

rectangle(frame,
                                new Point(result.x, result.y),
                                new Point(result.x + result.width, result.y + result.height),
                                new Scalar(255, 0, 255, 0), 2, LINE_8, 0);

It seems that there is no problem. Should I change it to:

rectangle(frame,
                                new Point(result.x, result.y),
                                new Point(result.x + result.width, result.y + result.height),
                                new Scalar(255, 0, 255, 0).retainReference(), 2, LINE_8, 0);

[saudet]

Since you're allocating a new object each time, it's not going to make any difference, no.

[4714407]

Thank you very much.

[saudet]

The fix has been released with version 1.5.5! Enjoy