wglMakeCurrent - The handle is invalid

Graphics and GPU Programming Programming OpenGL

Started by scarecr0w132 December 30, 2013 02:12 AM

2 comments, last by wintertime 10 years, 3 months ago

scarecr0w132

105

Author

December 30, 2013 02:12 AM

Hello,

I am fairly new to OpenGL, I don't fully understand everything yet :)
I have a viewer with a context. It is being drawn on the UI which has another separate context. (I am using QT for UI, and trying to draw widgets ontop of viewer.)
wglMakeCurrent() which gets called in the viewer code, fails and says from GetLastError(): wglMakeCurrent() failed. The handle is invalid.
This is how it is called:


...
if (wglMakeCurrent ((HDC )myWindowDC, (HGLRC )myGContext) != TRUE)
...

I uploaded the project if anyone wants to take a look.
What is a likely cause of this?

Vortez

2,714

December 30, 2013 03:05 AM

You could try calling GetLastError() to get a better idea of what is causing the error.

My Projects

scarecr0w132

105

Author

December 30, 2013 03:46 AM

You could try calling GetLastError() to get a better idea of what is causing the error.

Hi Vortez, as I said in my post GetLastError() code returned is : The handle is invalid.

Thanks

wintertime

4,154

December 30, 2013 12:14 PM

As you did not show how you defined myWindowDC and myGContext, and maybe they are classes only containing those handles as member, you may want to remove the typecasts inside the call to avoid hiding an error there. Then you should get a compiler error if that is the problem.

Otherwise look if the context got destroyed somewhere.

wglMakeCurrent - The handle is invalid

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wglMakeCurrent - The handle is invalid

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