Retrieves the user data of the user control.
long GetData (
void * userData,
long offset,
long size
) const;
Parameters
- userData
-
A previously allocated memory block for the user data. This parameter can be NULL.
- offset
-
0-based offset in the user data block.
- size
-
Number of bytes to retrieve from the user data block, beginning at offset.
Return Value
The size of the whole item data field.
If the function parameters are incorrect or offset + size is larger than the size of the
item data field, zero is returned.
Description
Every user control can have a block of data describing the visual appearance and the behavior of the
item. Moreover, the application can store any other information in this block.
Use NULL for the userData parameter to determine the total size of the user data block.
