VECTORENUMLAYERSPROC Function
#include "lvkrn.h"
L_INT pEXT_CALLBACK YourFunction(pVector, pLayer, pUserData)
pVECTORHANDLE pVector; |
/* pointer to a vector handle */ |
pVECTORLAYER pLayer; |
/* pointer to a vector layer */ |
L_VOID *pUserData; |
/* pointer to additional parameters */ |
Processes each vector layer enumerated by the L_VecEnumLayers function.
Parameter |
Description |
pVector |
Pointer to the vector handle that contains the layers to enumerate. |
pLayer |
Pointer to the vector layer being processed. |
pUserData |
A void pointer that you can use to access a variable or structure containing data that your callback function needs. This gives you a way to receive data indirectly from the function that uses this callback function. (This is the same pointer that you pass in the pUserData parameter of the calling function.) |
|
Keep in mind that this is a void pointer, which must be cast to the appropriate data type within your callback function. |
Returns
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
Comments
The L_VecEnumLayers function calls the callback function as it gets the handle of each vector layer.
Required DLLs and Libraries
LVKRN For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application. |
See Also
Functions: |
Example
For an example, refer to L_VecEnumLayers.