2.2.4.6.12 DataObject::ReleaseBuffer

ReleaseBuffer

1 Description
2 Syntax
3 Parameters
4 Return
5 Examples
6 Remark
7 See Also
8 Header to Include

Description

After call SetInternalDataType and use internal data buffer modify the obeject, must call this method to update the object.

Syntax

void ReleaseBuffer( )

Parameters

Return

Examples

EX1

void DataObject_ReleaseBuffer_Ex1()
{
	Worksheet wks = Project.ActiveLayer();
	if(wks)
	{
		Column col(wks, 0); // first column
 
		if( col )
		{			
			int nElementSize;
			uint nNum;
			LPVOID pData = col.GetInternalDataBuffer(&nElementSize, &nNum);				
			if(NULL == pData)
				out_str("return NULL if col is Text type or mixed type");
			else
			{
				if(0 != nNum)
				{
					double *pTemp = (double*)pData; // cast to double since cannot direclty access the value of void type pointer point to 
					*pTemp = 0.5; // change the value of first item 
					col.ReleaseBuffer(); // after call this, first row of first column will change to 0.5
				}
			}
		}
	}	
}