data and callback routines

HI -.

Still very new to CVI here.

I'm designing a small application that accepts data from various sources (files, socket) and plot the data on a chart. I read in the online help how the variable

void *callbackdata

can be used to avoid global variables. But I don't understand this - given that the program is not directly call these callback routines, how he specify/access the location of data here?

Maybe if someone would be kind enough to give a quick example, the light would come on for me. Thank you.

I can think of a scenario in which the main reminder keeps a double table or another data, past to a callback function that reads a file and fills the table, and then displays the data on a chart. In this scenario, the pointer to the array could be installed as callbackData castant button to (void *). The recall button could then allocate the array and fill it with data from the file. As wolfgang has said, is to ensure that the called callback throws the pointer to the correct data type.

You have two problems in this scenario: first, you have to store somewhere the length of the array of data for the other routines to manipulate correctly. second problem, you need to create a way to inform the main routine that called it has terminated so that it can display data, because if it is a reminder to order it is not directly called from the main().

The second element may be solutioned by the presence of a routine separate to display data and call it as well in hand and the reminder button. The routine must receive at least the handful of the Panel, the pointer to the array of data and its length.

Tags: NI Software

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