If you are using the main C++ distribution of wxWidgets, Feel free to ask any question related to wxWidgets development here. This means questions regarding to C++ and wxWidgets, not compile problems.
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moving from 2.8 to 3.0
I have a drag and drop object and this error is thrown.
..\..\src\msw\ole\droptgt.cpp(462): 'RevokeDragDrop' failed with error 0x80040100 (trying to revoke a drop target that has not been registered).
Exception thrown: read access violation.
this was 0x1.
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I presume this is a run-time exception?
In this case the message is pretty obvious - when you transition you code you did something.
Just look at what you changed and see what might be the issue.