Sets the active layer in the class object's associated vector. This function is available in the LEADTOOLS Vector Imaging Toolkit.
#include "ltwrappr.h"
virtual L_INT LVectorBase::SetActiveLayer(pVectorLayer);
Pointer to the LVectorLayer object that references the layer to set as the active layer.
Value | Meaning |
---|---|
SUCCESS | The function was successful. |
< 1 | An error occurred. Refer to Return Codes. |
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.
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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