CtrlMenuCallbackPtr example using

[altronics]

I am trying to use add a menu item called "ADD TO WATCH" when I right click on a Table Cell.

I cannot figure out how to "pass'  the CtrlMenuCallbackPtr eventFunction parameter!

Here is the fuction prototype:

int NewCtrlMenuItem (int panelHandle, int controlID, char itemLabel[], int beforeMenuItemID, CtrlMenuCallbackPtr eventFunction, void *eventCallbackData);

Here is my call:

NewCtrlMenuItem (run_table_panel, RUNDATA_TABLE, "Add To Watch", -1, ***?****,0);  
   

Here is the callback fuction:

int CVICALLBACK Add_Run_To_Watch (int panelHandle, int controlID, int MenuItemID, void *callbackData);
{

  switch (event)
  {
  case EVENT_COMMIT:

   break;
  }
 return 0;
}

[LuisG]

The NewCtrlMenuItem function call should look like this:

NewCtrlMenuItem (run_table_panel, RUNDATA_TABLE, "Add To Watch", -1, Add_Run_To_Watch, 0);

You'll need to make sure that somewhere above the call, or in a header file, you have declared Add_Run_To_Watch like this:

int CVICALLBACK Add_Run_To_Watch (int panelHandle, int controlID, int MenuItemID, void *callbackData);

Meanwhile, in the function definition itself, you have a couple of things wrong: 1) you have a semic-colon at the end of the definition line, which the compiler will not accept, and 2) in the body of the function you are looking for an EVENT_COMMIT. Menu callbacks, unlike control callbacks, are not sent specific events, so there is no parameter for you to check.

Hope this helps.

Luis
NI





 

[altronics]

Luis,

At the top of the file I have this:

int CVICALLBACK Add_Run_To_Watch (int panelHandle, int controlID, int MenuItemID, void *callbackData); 

I corrected the semi colon in the function definition, but I get the same error:

NewCtrlMenuItem (run_table_panel, RUNDATA_TABLE, "Add To Watch", -1, Add_Run_To_Watch, 0); 

  123, 98   Type error in argument 5 to `NewCtrlMenuItem'; found 'pointer to __cdecl int function(int,int,int,pointer to void)' expected 'CtrlMenuCallbackPtr'.

Any suggestions?

Thanks for you help

Fred

[LuisG]

Fred,

In order to compile properly, the function prototype of your callback function needs to match exactly the function prototype used in the definition of the CtrlMenuCallbackPtr typedef, in userint.h. When I first looked at your prototype it looked right, but now that I look at it more carefully, I can see where it's different: the return type of the function should be void. Yours returns an integer. Change it to a void and see if it will compile.

Luis