DataSource through procedure's parameter

rbuser

Hi,
How can I pass TDataSource through procedure call.
I have DataSource1.DataSet1 created dynamically in the main application.
Now I need to print the result by calling ppReport1 in dll.
eg.
..after GetProcAddress...
PrintResult(DataSource1)

...in dll
procedure PrintResult(Data: TDataSource)
begin
{ With Data do
begin
While not Dataset.Eof do
begin
ShowMessage(DataSet.FieldByName('Field1').AsString);
Next;
end;
end; debug purposes }
ppPipeLine.DataSource:= Data;
ppReport1.PrintReport;
end;
the Preview shows halfway and my apps crash.
I have no problem showing message for all the records(comment off debug
mode)
Please advise, how can I achive this.

TIA.
Hott

rbuser

Hi Hott...

Yo can try two things to solve this problem: a) Add the Borland
Memory Manager to your DLL and host application (as very first
statement in the uses clause) and b) compile your application with
run-time packages.

You are passing a object into your DLL, this means that they are
not type compatible as the DLL uses different RTTI information
set as your host application. The compiler might not include some
methods of the object which are not used in your DLL by itself,
but might be used when you pass in the object. This might cause
your AV.

If you use run-time packages the TDataSource is in the package
and has only one set of RTTI information for both.

Hope that helps...
-------------------------------------------------------------------
Marco Heine
QUMAS
Enterprise Compliance Management
Visit our Website: www.qumas.com