topic Re: EnableExtendedMouseEvents disabled by SuspendTimerCallbacks in LabWindows/CVI

EnableExtendedMouseEvents disabled by SuspendTimerCallbacks

cpoore — Thu, 20 Oct 2005 21:42:56 GMT

Using CVI 7.1.1, the EnableExtendedMouseEvents is disabled whenever I call the SuspendTimerCallbacks function.

i.e.

int CVICALLBACK PlotEvent (int panel, int control, int event, void *callbackData, int eventData1, int eventData2)
{
      if (event == EVENT_LEFT_MOUSE_UP)
    {
  // wait for UIF to update
  PostDeferredCall (GetCursorData, 0);

}// end if (event)

return 0;

}// end PlotEvent

Re: EnableExtendedMouseEvents disabled by SuspendTimerCallbacks

LuisG — Fri, 21 Oct 2005 15:15:09 GMT

The implementation of extended mouse events relies on timer controls to work. If you are curious, you can verify this in <CVI71>\toolslib\toolbox\toolbox.c.

Instead of suspending all timers, could you accomplish the same goal by setting some flag that causes your own timer callbacks to not do anything?

Luis
NI

Re: EnableExtendedMouseEvents disabled by SuspendTimerCallbacks

cpoore — Fri, 21 Oct 2005 21:50:15 GMT

I thought that might be the problem, but wasn't sure if this was a bug or intentional.

My original assumption with the SuspendTimerCallbacks function only affected timers controls in the user interface. The documentation for that function is vague concerning this. I was able to get around this by setting the enable attribute of the timer control.

Thanks for your reply.

Re: EnableExtendedMouseEvents disabled by SuspendTimerCallbacks

LuisG — Sat, 22 Oct 2005 20:14:24 GMT

It is true SuspendTimerCallbacks only affects timer controls in the User Interface library. What might not be very clear, however, is that much of the Programmer's Toolbox is implemented on top of the User Interface library, so it too is affected by any global settings of the library. You're correct in that we should probably make this a bit more clear.

Thanks,
Luis