How to detect invalid drawable?

Hi
working on a cross platform application that is over a decade old. The UI is by Qt and backend rendering is done with OpenGL. OpenGL contexts are managed in the back end, not by Qt. I have recently added error checking and reporting for all OpenGL code in our app. occasionally  a situation arises where the first render initiated by Qt causes and "invalid drawable" error , then all OpenGl calls fail with "invalid framebuffer" error reported. These invalid drawable error messages have been treated as inocuous in the past since before the user sees it eventually the drawable becomes valid and the scene is rendered correctly. However, with the new OpenGL error check/report it's not possible since there are large numbers of errors reported.
I would like to test if the drawable is valid, if not return before the render starts. How can I verify that the drawable is valid?
Thanks

Use one of the PBE encryption algorithms to encrypt data based on a password. It is simpler and more secure than your example. You can append a PBE-based MAC to the encrypted message to verify the correctness of your decryption. See http://java.sun.com/j2se/1.5.0/docs/guide/security/jce/JCERefGuide.html for more details.

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