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I am using a CExtReportGridWnd in my project. So far I create the the CExtReportGridWnd and add columns and that’s all it displays for now. When I change context within my program I want to clear out the ReportGrid and fill it with new Rows, Columns and data. A while back I asked about this and you suggested the following to clear the ReportGrid:

LONG nColCount = wndGrid.ColumnCountGet(), nRowCount = wndGrid.RowCountGet();
if( nRowCount > 0 )
{
wndGrid.SelectionUnset( false, false );
wndGrid.ReportItemUnRegisterSelection( false );
}
wndGrid.SelectionUnset( false, false );
wndGrid.FocusUnset( false );
wndGrid.ReportColumnUnRegister( NULL, NULL, false );

ReportColumnUnRegister( NULL, NULL, true ) is not deleting the columns! They remain in the display when I add the new columns!!

=============================
ALSO, Regarding Adding Rows:
=============================

Your ReportGrid sample uses the following:
CTypedPtrArray < CPtrArray, CExtReportGridItem * > arrRegisteredItems;
arrRegisteredItems.SetSize( nRowCount );

I assume this creates nRowCount instances of CExtReportGridItem.

I tried the following (simplified):

CExtReportGridColumn *pRGC =    ReportColumnRegister(
        _T("Preset"),
        _T("Presets"),
        true,
        false
        );

CExtReportGridItem *pRGI = new CExtReportGridItem();

pCell = ReportItemGetCell( pRGC, pRGI, RUNTIME_CLASS(CExtGridCellStringDM) );

It fails.

My report is populated with rows from an outside slow data source over a wire. I don’t know how many rows beforehand. If you could provide a simple example I would apreciate it.

One other thing. When oh when will updated help be ready. Reading headers and source to use all the stuff added since help was last updated is a pain!! Last I heard something new was supposed to be added in July then final in August.

I missed the code in the ASSERT following the CTypedPtrArray array code. I see that I should have used:

CExtReportGridItem *pRGI = ReportItemRegister();

It didn’t seem like SetSize was going going to do anything other than create an array of ptrs.

As for deletion, I use the following code for removing all rows:

LONG nColCount = ColumnCountGet();
LONG nRowCount = RowCountGet();
	if( nRowCount != 0 && nColCount != 0 ) {
		SelectionUnset( false, false );
		SelectionInsertAt( 0, CRect( 0, 0, nColCount - 1, nRowCount - 1 ), false );
		ReportItemUnRegisterSelection(false);
	}

As for deleting columns, I’d try this one: when registering all the columns, save them in a class variable CTypedPtrList < CPtrList, CExtReportGridColumn * > m_listColumns. Similar is done in ReportGrid sample. Then this code should work:

POSITION pos = m_listColumns.GetHeadPosition();
CExtReportGridColumn * pRGC = NULL;
	while( pos ) {
		pRGC = m_listColumns.GetNext( pos );
		ReportColumnUnRegister( pRGC, false );
	}
	m_listColumns.RemoveAll();

As for adding rows one by one, I use this code (simplified):

CExtReportGridColumn * pRGC = NULL;
CExtReportGridItem * pRGI = NULL;
POSITION pos = NULL;
CExtGridCell * pCell = NULL;
bool bRowAvailable = ...;
	
	while( bRowAvailable ) {
		pRGI = ReportItemRegister();
		ASSERT_VALID(pRGI);
		
		pos = m_listColumns.GetHeadPosition();
		// filling row’s first cell
		pRGC = m_listColumns.GetNext( pos );
		pCell = ReportItemGetCell( pRGC, pRGI, RUNTIME_CLASS(CExtGridCellNumber) );
		ASSERT_VALID( pCell );
		((CExtGridCellNumber*)pCell)->_VariantAssign( iSomeNumber, VT_UI4 );
		...
		
		// filling row’s second cell
		pRGC = m_listColumns.GetNext( pos );
		pCell = ReportItemGetCell( pRGC, pRGI, RUNTIME_CLASS(CExtGridCellStringDM) );
		ASSERT_VALID( pCell );
		...
	}

Thank you for your suggestions however I have found that the library function ReportColumnUnRegister( pRGC )
does not work. Neither does ReportColumnUnRegisterCategory( __EXT_MFC_SAFE_LPCTSTR strCategoryName,
bool bRedraw = true ); The latter even returns the correct amount of columns that it supposedly unregistered
but they still display.

We cannot confirm this problem. You can modify the CChildView::OnEditClear() method the ReportGrid sample, then compile and run it and hit Delete key in the report grid window:

void CChildView::OnEditClear() 
{
    ReportColumnUnRegister(
        _T("Name"),
        _T("Main Information"),
        true
        );
    return;

You will see that the Name column is deleted correctly. Would you perform any similar modification of our sample to demostrate the problem?

I placed the following in CChildView::OnEditClear as you suggested:

void CChildView::OnEditClear()
{
    if( RowCountGet() == 0 || ColumnCountGet() == 0 )
        return;

LONG nColumns = ColumnCountGet();

ReportColumnUnRegister(
_T("Name"),
_T("Main Information"),
true
);

nColumns = ColumnCountGet();

return;

I deleted the registry entry for ReportGrids in order to start from scratch as I played with the sample alot and the column layout was not default. I run the sample, select an item, press DEL and the "Name" column remains!! Furthermore if I break and check nColumns it is the same number before and after ReportColumnUnRegister. From there the app is unstable, for instance if I try to drag "Name" column it asserts. It also asserts on close. This is the same way my own app behaves when deleting columns.

I use v2.54, VS2005, MBCS Debug. I did not edit any library code in any way.

Thank you for reporting the bug. Please contact us via e-mail at support@prof-uis.com to get the fixed code.