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
                                }
                        }
                }
        }     
}