L_VecEnumObjectsInGroup

#include "lvkrn.h"

L_LVKRN_API L_INT L_VecEnumObjectsInGroup(pVector, pGroup, pEnumProc, pUserData, dwFlags)

pVECTORHANDLE pVector;	pointer to a vector handle
const pVECTORGROUP pGroup;	pointer to a vector group
pVECTORENUMOBJECTSPROC pEnumProc;	pointer to a callback function
L_VOID * pUserData;	pointer to more parameters for the callback
L_UINT32 dwFlags;	flags

Enumerates all objects inside a vector group.

Parameter	Description
pVector	Pointer to a vector handle.
pGroup	Pointer to a vector group. The objects inside this group will be enumerated.
pEnumProc	Pointer to the callback function used to enumerate the objects within the vector group. The callback function must adhere to the function prototype described in VECTORENUMOBJECTSPROC.
pUserData	Void pointer that you can use to pass one or more additional parameters that the callback function needs.
	To use this feature, assign a value to a variable or create a structure that contains as many fields as you need. Then, in this parameter, pass the address of the variable or structure, casting it to L_VOID *. The callback function, which receives the address in its own pUserData parameter, can cast it to a pointer of the appropriate data type to access your variable or structure.
	If the additional parameters are not needed, you can pass NULL in this parameter.
dwFlags	Flag that indicates which objects to enumerate. Possible values are:
	Value	Meaning
	0	Enumerate all objects in the group.
	VECTOR_FLAGS_SELECTED_ONLY	Enumerate only selected objects in the group.

Returns

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

Comments

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.

Example

This example will count the objects inside a given group.

static L_INT EXT_CALLBACK EnumObjectsProc( 
pVECTORHANDLE pVector, 
pVECTOROBJECT pObject, 
L_VOID* pData) 
{ 
   L_INT nCount; 
   UNREFERENCED_PARAMETER( pVector ); 
   UNREFERENCED_PARAMETER( pObject ); 
   /* Increment count */ 
   nCount = *(L_INT*) pData; 
   nCount++; 
   /* Continue the enumeration */ 
   return( SUCCESS ); 
} 
L_INT VecEnumObjectsInGroupExample( 
pVECTORHANDLE pVector, 
const L_TCHAR* pszGroupName, 
L_INT* pnCount) 
{ 
   L_INT nRet; 
   VECTORGROUP Group; 
   /* Get the group handle */ 
   nRet = L_VecGetGroupByName( pVector, pszGroupName, &Group ); 
   if(nRet != SUCCESS) 
      return nRet; 
   /* Enum all objects inside this group */ 
   *pnCount = 0; 
   nRet = L_VecEnumObjectsInGroup( pVector, &Group, (pVECTORENUMOBJECTSPROC)EnumObjectsProc, pnCount, 0 ); 
   return nRet; 
}

Help Version 19.0.2017.10.27

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LEADTOOLS Vector C API Help

Introduction

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LEADTOOLS Vector Features

Redistributables/Files To Be Included With Your Application

Functions:	L_VecEnumObjects, L_VecEnumVertices, VECTORENUMOBJECTSPROC
Topics:	Working with Vector Groups