LVectorBase::GetActiveLayer

#include "ltwrappr.h"

virtual L_INT LVectorBase::GetActiveLayer(pVectorLayer);

LVectorLayer * pVectorLayer;

/* pointer to vector layer object */

Gets the active layer inside the class object's vector.

Parameter	Description
pVectorLayer	Pointer to an LVectorLayer object to be updated with the active layer.

Returns

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

Comments

Some functions will 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

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:	LVectorBase::SetActiveLayer.
Topics:	Working with Vector Layers

Example

// This example copies all objects from the active layer of the vector source
// to the destination vector (active layer)
class LMyVectorLayer: public LVectorLayer
{
public:
   LVectorBase *m_pVectorDst;

public:
   LMyVectorLayer() {};
   virtual ~LMyVectorLayer(){};
   virtual L_INT EnumObjectsCallBack(pVECTORHANDLE pVector, pVECTOROBJECT pObject);
};

L_INT LMyVectorLayer::EnumObjectsCallBack(pVECTORHANDLE pVector, pVECTOROBJECT pObject)
{
   LVectorBase   VectorBase(pVector);
   LVectorObject VectorObject(pObject, &VectorBase);
   m_pVectorDst->CopyObject(&VectorObject);
   VectorBase.SetHandle(NULL, FALSE);
   return SUCCESS ;
}

L_VOID Example76(HWND hWnd, LVectorBase *pVectorDst)
{
   //Load a source vector
   LVectorBase VectorSrc;
   VectorSrc.Load(TEXT("square3.dxf"));

   //Get the active layer of source
   LMyVectorLayer  VectorLayer;
   VectorSrc.GetActiveLayer(&VectorLayer);

   //Set the destination vector where objects from source will be copied
   VectorLayer.m_pVectorDst = pVectorDst;

   //Enumerate all objects in Active layer (and copy to destination vector)
   VectorLayer.EnumObjects();
}