Queries with parameters fail in Delphi XE3

Hello Folks!

I have been attempting to move a Delphi XE2 DataSnap server & client project to Delphi XE3. I had to do some minor tweaks like adding the unit IPPeerServer.pas to the uses clause of the server container class but what has really caused me headaches are the parameterised queries. If I try to open a ClientDataSet on the client-side I run into a "Catastrophic failure". Here is the call stack on the client-side at the time:

System.Classes.MoveData((0, 0, 0, ...
System.Classes.TMemoryStream.Write((0, 0, 0, ...
Data.DSUtil.TVariantStreamer.WriteArray(Variant array of Variant,$3213A40)
Data.DSUtil.TVariantStreamer.WriteVariant(Variant array of Variant,$3213A40)
Data.DSUtil.TVariantStreamer.WriteArray(Variant array of Variant,$3213A40)
Data.DSUtil.TVariantStreamer.WriteVariant(Variant array of Variant,$3213A40)
Data.DSUtil.VariantToStream(Variant array of Variant,$3213A40)
Data.DBXCommon.TDBXStreamValue.SetAsVariant(Variant array of Variant)
Datasnap.DSConnect.TDSProviderConnection.AS_GetRecords('dspEmployee',-1,0,1,'',Variant array of Variant,Unassigned)
Datasnap.DBClient.TCustomClientDataSet.DoGetRecords(-1,0,1,'',Variant array of Variant)
Vcl.Forms.TApplication.CreateForm(???,(no value))
:76393677 kernel32.BaseThreadInitThunk + 0x12
:772c9d72 ntdll.RtlInitializeExceptionChain + 0x63
:772c9d45 ntdll.RtlInitializeExceptionChain + 0x36

This call stack is based on a sample DataSnap server connecting to Firebird's Employee DB and a client app that wants to open the employee query using two parameters: FirstName & LastName. The client request doesn't even reach the DataSnap server.

The sample project can be downloaded from here:

Is there anything wrong in my code?

10/3/2012 1:41:33 AM
embarcadero.datasnap 643 articles. 1 followers. Follow

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I just saw the Quality Central entry 108904 here:

This is pretty much what I experience too in VCL or FMX client-side applications. I have voted for it as it is a critical bug in moving my Delphi XE2 project to XE3.

10/3/2012 2:34:26 AM
Am 03.10.2012 04:34, schrieb Mathias Burbach:
> I have voted for it as it is a critical bug in moving my Delphi XE2 project to XE3.

I agree, this is a complete showstopper for datasnap applications under XE3.

Uwe Raabe
Embarcadero MVP
Uwe's Blog: The Art of Delphi Programming <http://www.uweraabe.de/>
10/3/2012 8:24:23 AM
Upboats on QC for this.
10/3/2012 8:32:06 AM
class procedure TVariantStreamer.WriteVariant(const Value: OleVariant; const Data: TStream);
  if VType and varArray <> 0 then
    WriteArray(Value, Data)
    case (VType and varTypeMask) of
      varEmpty, varNull:
          ByteArray := TEncoding.Unicode.GetBytes(Value);
          I := Length(ByteArray) div SizeOf(Char);
          Data.Write(VType, SizeOf(Integer));
          Data.Write(I, SizeOf(Integer));
          // Data.Write(ByteArray[0], I * SizeOf(Char));
          // Fix Range Error
          if I > 0 then
            Data.Write(ByteArray[0], I * SizeOf(Char));
      if VType and varByRef = varByRef then
        //Data.Write( TVarData(Value).VPointer, VariantSize[VType and varTypeMask]);
        //Change to
        Data.Write( PPointer(TVarData(Value).VPointer), VariantSize[VType and varTypeMask]);

Data.Write call TStream.Write(const Buffer: TBytes; Count: Longint)
*TVarData(Value).VPointer is TBytes?*

Data.Write( TVarData(Value).VPointer, VariantSize[VType and varTypeMask]);
Data.Write( PPointer(TVarData(Value).VPointer), VariantSize[VType and varTypeMask]);

That's call old Methd
function TMemoryStream.Write(const Buffer; Count: Longint): Longint;
10/6/2012 6:05:19 PM
Hello Jackie,

Thanks for posting this fix. I used it in my sample Firebird - DataSnap - Employee application and I can now open the +ClientDataSet+ at run-time. For the design-time to work I will need to wait until Embarcadero ships a new +dsnap170.bpl+ package as part of a Delphi XE3 update pack?!?


Edited by: Mathias Burbach on Oct 7, 2012 8:29 AM
10/6/2012 9:29:31 PM
You can waiting...
10/11/2012 2:16:16 PM

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