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LVectorBase::SetActiveLayer

#include "ltwrappr.h"

virtual L_INT LVectorBase::SetActiveLayer(pVectorLayer);

Sets the active layer in the class object's associated vector. This function is available in the LEADTOOLS Vector Imaging Pro Toolkit.

Parameters

LVectorLayer * pVectorLayer

Pointer to the LVectorLayer object that references the layer to set as the active layer.

Returns

Value	Meaning
SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

Some functions use the active layer when NULL is passed for a pLVectorLayer parameter. This makes it easier to work with the toolkit when layers are not needed.

Required DLLs and Libraries

LTVKRN
For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Functions

LVectorBase::GetActiveLayer.

Topics

Working with Vector Layers

Example

This example adds a new layer, and makes it the active layer.

L_INT LVectorBase__SetActiveLayerExample(HWND hWnd, LVectorBase *pVector) 
{ 
   UNREFERENCED_PARAMETER(hWnd); 
 
   L_INT             nRet; 
   VECTORLAYERDESC   Desc; 
   LVectorLayer      Layer; 
 
   nRet = Layer.GetLayerDesc(&Desc); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   lstrcpy(Desc.szName, TEXT("Tom's new layer")); 
 
   nRet = Layer.SetLayerDesc(&Desc); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   nRet = pVector-> AddLayer(&Layer); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   nRet = pVector->SetActiveLayer(&Layer); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   return SUCCESS; 
}

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Help Version 21.0.2021.7.2

LEADTOOLS Vector C++ Class Library Help

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