LVectorBase::GetActiveLayer

#include "ltwrappr.h"

virtual L_INT LVectorBase::GetActiveLayer(pVectorLayer);

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

Parameters

LVectorLayer * pVectorLayer

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

Returns

Value Meaning
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

See Also

Functions

Topics

Example

// This example copies all objects from the active layer of the vector source 
// to the destination vector (active layer) 
class LMyVectorLayer1: public LVectorLayer 
{ 
public: 
   LVectorBase *m_pVectorDst; 
 
public: 
   LMyVectorLayer1() {}; 
   virtual ~LMyVectorLayer1(){}; 
   virtual L_INT EnumObjectsCallBackGAL(pVECTORHANDLE pVector, pVECTOROBJECT pObject); 
}; 
 
 
L_INT LMyVectorLayer1::EnumObjectsCallBackGAL(pVECTORHANDLE pVector, pVECTOROBJECT pObject) 
{ 
   LVectorBase   VectorBase(pVector); 
   LVectorObject VectorObject(pObject, &VectorBase); 
 
   m_pVectorDst->CopyObject(&VectorObject); 
 
   VectorBase.SetHandle(NULL, FALSE); 
 
   return SUCCESS ; 
} 
 
L_INT LVectorBase__GetActiveLayerExample(HWND hWnd, LVectorBase *pVectorDst) 
{ 
   UNREFERENCED_PARAMETER(hWnd); 
 
   //Load a source vector 
   L_INT       nRet; 
   LVectorBase VectorSrc; 
 
   nRet = VectorSrc.Load(MAKE_IMAGE_PATH(TEXT("random.dxf"))); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   //Get the active layer of source 
   LMyVectorLayer1  VectorLayer; 
   nRet = VectorSrc.GetActiveLayer(&VectorLayer); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   //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) 
   nRet = VectorLayer.EnumObjects(); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   return SUCCESS; 
} 
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