Call back function

Posted on 2003-02-24
Medium Priority
Last Modified: 2010-04-17
what is a call back function when and where can we use it.
Question by:vijaka
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Accepted Solution

StonedRaider earned 100 total points
ID: 8006948
it is a normal funcion that windows will call for you.
you can use it for enumerations like:
EnumWindows() function or EnumChildWindows() function, etc

Assisted Solution

Shmarya earned 100 total points
ID: 8007053
Callback functions are fairly simple in concept:

When you issue an API command that needs to collect data, or do some process, before returning to you, you need some way for the API process to let you know when it is done. Enter Callback Functions!

Windows API callback functions allow you to issue Asynchronous API commands and receive notification in the form of a certain method (the address of which you pass in the original API call) being called when that process completes. This allows you to, for example, ask windows for an Enumeration of all windows (using EnumWindows) and return control to your UI until windows responds.

I hope this helped.

Expert Comment

ID: 9447554
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