LVectorBase::EnumLayers

#include "ltwrappr"

virtual L_INT LVectorBase::EnumLayers(L_VOID)

Enumerates all layers inside the class object's associated vector handle.

Returns

SUCCESS

The function was successful.

< 1

An error occurred. Refer to Return Codes.

Comments

The LVectorBase::EnumLayers function calls the LVectorBase::EnumLayersCallBack function as it gets a pointer to each vector layer.

To use the LVectorBase::EnumLayersCallBack, you must derive a class from LVectorBase and override the LVectorBase::EnumLayersCallBack member function.

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::EnumLayersCallBack, Class Members

Topics:

Working with Vector Layers

Example

This example enumerates through all layers in a vector.

#ifdef LMyVectorBase4 
class LMyVectorBase4: public LVectorBase 
{ 
public: 
   L_INT          m_nLayerCount ; 
public: 
   LMyVectorBase4() {m_nLayerCount=0;}; 
   virtual ~LMyVectorBase4(){}; 
   virtual L_INT EnumLayersCallBack(pVECTORHANDLE pVector, pVECTORLAYER pLayer); 
}; 
#endif // #ifdef LMyVectorBase4 
L_INT LMyVectorBase4::EnumLayersCallBack(pVECTORHANDLE pVector, pVECTORLAYER pLayer) 
{ 
   UNREFERENCED_PARAMETER(pVector); 
   LVectorLayer VectorLayer(pLayer, this); 
   L_TCHAR szMsg[100]; 
   m_nLayerCount++; 
   VECTORLAYERDESC LayerDesc; 
   VectorLayer.GetLayerDesc(&LayerDesc); 
   wsprintf(szMsg, TEXT("Layer\nName[%s]\nSize[%d]\nLocked[%d]\nVisible[%d]"), 
   LayerDesc.szName, 
   LayerDesc.nSize, 
   LayerDesc.bLocked, 
   LayerDesc.bVisible 
   ); 
   MessageBox(NULL, szMsg, TEXT(""), MB_OK); 
   return SUCCESS ; 
   //...LVectorLayer destructor called when VectorLayer goes out of scope 
} 
L_INT LVectorBase__EnumLayersExample(HWND hWnd, LMyVectorBase4 *pMyVector) 
{ 
   UNREFERENCED_PARAMETER(hWnd); 
   L_INT          nRet; 
   LMyVectorBase4 MyVector; 
   L_TCHAR        szMsg[100]; 
   pMyVector->m_nLayerCount=0; 
   pMyVector->EnableCallBack(TRUE); 
   nRet = pMyVector->EnumLayers(); 
   if(nRet != SUCCESS) 
      return nRet; 
   wsprintf(szMsg, TEXT("Total Layers[%d]"), pMyVector->m_nLayerCount); 
   MessageBox(NULL, szMsg, TEXT(""), MB_OK); 
   return SUCCESS; 
}

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