AV: when selecting a field

manny2463 · October 2003

I installed OQB on delphi6. I compiled the bde demo and run it.
When I try to select a field from a table to be include in the sql statement
I get an AV at the line below. ( see ***** AV: HERE *******)

procedure TOQBLbx.ClickCheck;
var
iCol: Integer;
begin
inherited;
if FLoading then
Exit;

if Checked[ItemIndex] then
begin
TOQBForm(GetParentForm(Self)).QBGrid.Insert( // ***** AV: HERE *******
TOQBForm(GetParentForm(Self)).QBGrid.ColCount,
Items[ItemIndex], TOQBTable(Parent).FTableName);
end

Samuray · October 2003

Thank you for bug report.
This error present constantly?

manny2463 · October 2003

Yes, all the time I try to add a field

martinB · November 2003

Hi, I have found the same error with OQB in Delphi 6. The problem seems to be that the parent of the stringGrid (TOQBGrid) is being set as nil. For some reason the parent property of (tabColumn - TOQBgrids parent) is being set as nil in delphi 6. The same code recompiles and runs ok in delphi 5.

anyone got any ideas ?

Thankx in advance.

finalfiler · November 2003

martinB wrote:

TOQBgrids parent) is being set as nil in delphi 6. The same code recompiles and runs ok in delphi 5.

Just want to confirm the I'm having the same problem in D6. D7 is OK.

Anyone working on a fix?

I notice that after dropping in my much hacked Qbuilder.pas, which dates back to the days of Delphi 4, no such problem.

I've just placed an update at http://groups.yahoo.com/group/fastreport/f...51_MSAccess.zip

Be warned that this thing is very muched geared towards MS-Access, ie unsual table and field name delimiters, although you can easily change that be searching for

FmsAccess := True;
and changing it to

FmsAccess := False;

TIA

rodries · August 2004

A very simple fix is add this line:

QBGrid.Parent := TabColumns;

in the event OnCreate of OQBForm

The problem is that TOQBForm.CreateParams if called before TabColumns is loaded. A professional fix is create a procedure Loaded in TOQBForm class which is called automatically after OQBForm is fully created. But is similar to my first fix.

erp2 · June 2005

rodries wrote:

A very simple fix is add this line:

QBGrid.Parent := TabColumns;

in the event OnCreate of OQBForm

The problem is that TOQBForm.CreateParams if called before TabColumns is loaded. A professional fix is create a procedure Loaded in TOQBForm class which is called automatically after OQBForm is fully created. But is similar to my first fix.

Thanks

huang zhi

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AV: when selecting a field

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