I am using Delphi XE7, Firemonkey Mobile. Tried both on W32 as well as my Nexus4 (Android 4.4.4).
Problem: when loading an image from the clientdataset I get the following errors 1. Remote error: [FireDAC]{Phys][fB]-306. Command text must not be empty. (Connection) 2. Socket Error, even though the CDS does already contain the data (No connection)
Firebird DB --> Firedac --> Datasnap [server] --> DBX connection --> DSProviderconnection --> Clientdatasets
The datasetprovider on the server has the following options set: - poFetchBlobsOnDemand - poAllowCommandText
The loaded field is indeed a blob field and does contain data.
if DM_OD.CDS_QEmballage.FieldByName('AFBEELDING').IsBlob then
begin
if DM_OD.CDS_QEmballage.FieldByName('AFBEELDING').IsNull then
begin
showmessage('Empty!'); //for testing puropses
end
else
begin
try
BF := DM_OD.CDS_QEmballage.FieldByName('AFBEELDING') as TBlobfield;
BS := DM_OD.CDS_QEmballage.CreateBlobStream(BF, bmRead); //error message
self.Items[i].EmbalPic.LoadFromStream(BS);
finally
BS.Free;
end;
end;
end;
Try this:
var
ms: TMemoryStream;
begin
ms := TMemoryStream.Create;
try
TBlobField( DM_OD.CDS_QEmballage.FieldByName('AFBEELDING') ).SaveToStream( ms );
self.Items[i].EmbalPic.LoadFromStream( ms );
finally
ms.Free;
end;
end;
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