Functions for Setting and Retrieving Values from Variant Safe Arrays

Here are two very easy-to-use functions for setting (FillVariant) and retrieving (GetVariant) values from a variant safe array. All of the instructions that you'll need to use these functions can be found in the comments below. Simply copy and paste the code from this article into your files and follow these instructions.


//////////////////////////////////////////////////////////////////////////
// Kishore:-
// include this pice of code in .h file.
// function for putting values to VARIANT->SAFEARRAY
// function for getting values from VARIANT->SAFEARRAY
// 
// @1 Type of Array 
// @2 Actual type contained in the variant
// @3 Variant to read or write 
// @4 Actual array to read or write
// @5 VT_BSTR or VT_DATE ...  (FillVariant)
// Usage:- 
// BSTRArray someThing; someThing.Add(bstr);
// FillVariant<BSTRArray,BSTR>(&toVariant,someThing,VT_BSTR);
//
// _BSTR_TArray someThing;
// GetVariant<_BSTR_TArray,BSTR>(fromVariant,someThing);
// _bstr_t _bstr=someThing.GetSize(),GetAt(),[n]
//
// GetVariant<DATEArray,DATE>(fromVariant,dt);
// GetVariant<OLEDATETIMEArray,DATE>(fromVariant,dt);
// OleDateTime x=dt.GetAt(n) ...GetSize(),[],.....
////////////////////////////////////////////////////////////////////////////

#include <afxtempl.h>

typedef CArray<BSTR,BSTR> BSTRArray;
typedef CArray<DATE,DATE> DATEArray;
typedef CArray<_bstr_t,_bstr_t> _BSTR_TArray;
typedef CArray<COleDateTime,COleDateTime> OLEDATETIMEArray;
typedef CArray<DWORD,DWORD> DWORDArray;

template <class T,class T1> 
void FillVariant(VARIANT* pVariant, T& arrySrc,int iType)
{
 ASSERT(NULL!=pVariant);
 VariantInit(pVariant);
 int iMax = arrySrc.GetSize();

 SAFEARRAY * pSafeArray; 
 SAFEARRAYBOUND aDim[1]; 
 aDim[0].lLbound = 0; 
 aDim[0].cElements = iMax;

 pVariant->vt = VT_ARRAY | iType;

 pSafeArray = SafeArrayCreate(iType, 1, aDim);

 T1* dwArray = NULL;
 SafeArrayAccessData(pSafeArray, (void**)&dwArray);

 for(int nCount = 0; nCount < iMax ; nCount++)
 {
  dwArray[nCount] = (T1)arrySrc[nCount];
 }
 SafeArrayUnaccessData(pSafeArray);
 pVariant->parray = pSafeArray;
} 

template <class T,class T1> 
void GetVariant(VARIANT variant, T& arrySrc)
{
 long lStartBound = 0;
 long lEndBound = 0;
 
 SAFEARRAY* pSafeArray  = variant.parray;
 ASSERT(NULL!=pSafeArray);
 SafeArrayGetLBound(pSafeArray, 1, &lStartBound);
 SafeArrayGetUBound(pSafeArray, 1, &lEndBound);

 T1* arrayAccess = NULL;
 SafeArrayAccessData(pSafeArray, (void**)&arrayAccess);
 
 for(int iIndex = lStartBound; iIndex <= lEndBound; iIndex ++)
 {
  arrySrc.Add((T1)arrayAccess[iIndex]);
 }
 SafeArrayDestroy(pSafeArray);
 SafeArrayUnaccessData(pSafeArray);
}


Comments

  • How to return CArray object from Function

    Posted by renugopal on 06/20/2005 01:48am

    How to pass & return CArray object with Function Thanks -Renugopal

    Reply
  • OMG, your a life saver

    Posted by Legacy on 02/09/2003 12:00am

    Originally posted by: Jeryl Cook

    EXCELLENT!!!

    Reply
  • anybody created 2 or 3 dimensional arrays with this code ?

    Posted by Legacy on 10/17/2002 12:00am

    Originally posted by: SAM

    Pls send or post the code with 2 or 3 dimensional arrays....

    Thank you in Advance

    Reply
  • why ?

    Posted by Legacy on 07/03/2002 12:00am

    Originally posted by: skizmo

    why did M$ build this ??? it is (!Excellent)

    Reply
  • Functions for Setting and Retrieving Values from Variant Safe Arrays

    Posted by Legacy on 01/16/2002 12:00am

    Originally posted by: binoo

    very good coding

    Reply
  • h file..

    Posted by Legacy on 01/04/2002 12:00am

    Originally posted by: mb

    what exactly do I need to have in my H file? I don't understand how to create it.


    Reply
  • dfkfdk

    Posted by Legacy on 09/06/2001 12:00am

    Originally posted by: ashish sambare

    bekkar project

    Reply
  • Mast !

    Posted by Legacy on 05/30/2000 12:00am

    Originally posted by: Vinod Mahajan

    Really helpful code...If One know SafeArray very well then he/she knows COM...VB programmer may find it difficult initially anyway thats the beauty of C++...Thank you...


    Reply
  • Great Piece of Work...Keep it up...

    Posted by Legacy on 05/25/2000 12:00am

    Originally posted by: Kapil

    Great Piece of Work...Keep it up...

    kapil

    Reply
  • Excellent

    Posted by Legacy on 05/01/2000 12:00am

    Originally posted by: Anil Kumar

    It is excellent and ready to use. It was very helpful to us

    Reply
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