General Protection Fault caused by CVI ToolTip

[Wim S]

Hi folks,

When I quit my application in debug mode, I always get a General Protection Fault when the application's panel is discarded. After some research, I found out that the problem is caused by using the SetCtrlToolTip functions from the Programmer's Toolbox. When I put toolbox.c in my project, the debugger gives the GPF in the UnchainPanelCallback  function, which is called by SharedTipPanel_Dispose. The debugger stops at line 10528 of the toolbox.c file, which contains this code:

 while (!found && currLink && currLink->signature == CALLBACK_LINK_SIGNATURE)

Strange thing is that I use these ToolTips in all my applications, and this is the first time I experience this problem...

Anyone has a clue?

[Wim S]

OK, I solved the problem. All I had to do was initializing the panel's callback data to NULL. Actually I persumed that this is already set to NULL when no callbackdata has been specified...

[nqn827]

Could you please tell me how you "initialize the panel's callback data to NULL"?

[Wim S]

Here you go:

SetPanelAttribute (pnlHandle, ATTR_CALLBACK_DATA, NULL);