L_VecGetLayerCount
#include "lvkrn.h"
L_LVKRN_API L_INT L_VecGetLayerCount(pVector)
const pVECTORHANDLE pVector; |
/* pointer to a vector handle */ |
Returns the number of layers inside a vector handle.
Parameter |
Description |
pVector |
Pointer to the vector handle. |
Returns
Number of layers.
Comments
After calling this function, L_VecGetLayerByIndex can be used to iterate through the layers in a vector handle.
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: |
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Topics: |
Example
This example will show the names of the all layers inside a vector handle, in a message box.
L_INT VecGetLayerCountExample(pVECTORHANDLE pVector) { L_INT nRet; L_INT nCount, i; VECTORLAYER Layer; VECTORLAYERDESC LayerDesc; /* Get number of layers inside the vector handle */ nCount = L_VecGetLayerCount( pVector ); nRet = SUCCESS; /* Iterate through the layers */ for( i = 0; i < nCount; i++ ) { /* Get layer and its descriptor */ nRet = L_VecGetLayerByIndex( pVector, i, &Layer ); if(nRet != SUCCESS) return nRet; nRet = L_VecGetLayer( pVector, &Layer, &LayerDesc ); if(nRet != SUCCESS) return nRet; /* Show name in a message box */ MessageBox( NULL, LayerDesc.szName, TEXT("Layer Name"), MB_OK ); /* Free the layer descriptor because it's no longer needed */ nRet = L_VecFreeLayer( &LayerDesc ); } return nRet; }