How to resolve NON-FATAL RUN-TIME ERROR in CVI/Labwindows

Question

It says "the call back function function specified in uir is not a known function. If you are using the external compiler,you must include all the uir callbacks objects or source file in the executable or DLL". Am getting this error,how to resolve this issue. Thankyou.

Answer 1

See how to use callback functions. Normally when you have defined a callback YOURCBK for a control in your YOURUIR.UIR, then the prototype of the callback should be automatically generated in a corresponding YOURUIR.h as follow:

/* Callback Prototypes: */ 
int  CVICALLBACK YOURCBK(int panel, int control, int event, void *callbackData, int eventData1, int eventData2);

Then all you have to do is to define the implementation of this callback in a c file and include it in the project:

int CVICALLBACK YOURCBK(int panel, int control, int event,
        void *callbackData, int eventData1, int eventData2)
{
    switch (event)
    {
        case EVENT_COMMIT:
            MessagePopup("Hooray", "You clicked me!");
            break;
    }
    return 0;
}