I’m using NetBeans IDE 8.0.2 on my Win7 machine to develop Raspberry Pi opencv C++ application. I’m building & debugging the application remotely on the Raspberry Pi from my Win7 machine.
At run time the application fails with “Gtk-WARNING **: cannot open display:” error when reaches the line:
imshow("source", src);
When I’m running the exact same application from the Raspberry Pi and not remotely via SSH everything works as expected.
Is there any way that I can configure NetBeans to open GTK windows at the Raspberry Pi?
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Answer
The solution is to add DISPLAY=:0 Environment variable.
At File menu select Project Properties (yourprojectname) to open Project Properties window. At Categories: click Run and then click Environment, add variable name DISPLAY with value :0
Good luck