Example: TcxCustomDataController.SaveToStream, TcxCustomDataController.LoadFromStream

• Jul 29, 2021

The SaveToStream and LoadFromStream methods provided by a data controller enable you to save and restore data in unbound loading mode.

The following example shows how to save information and restore it from a file for the tvPlanets view in ExpressQuantumGrid.

Delphi

var
  AStream: TStream;
//...
//Saving data to a file
  AStream := TFileStream.Create('e:\stream.txt', fmCreate);
  try
    tvPlanets.DataController.SaveToStream(AStream);
  finally
    AStream.Free;
  end;
//...
//Loading data from the file
  AStream := TFileStream.Create('e:\stream.txt', fmOpenRead);
  try
    tvPlanets.DataController.LoadFromStream(AStream);
  finally
    AStream.Free;
  end;

C++

TStream * AStream = new TFileStream("e:\\stream.txt", fmCreate);
//Saving data to a file
  try {
    tvPlanets->DataController->SaveToStream(AStream);
  } __finally {
    delete AStream;
  }
//...
//Loading data from the file
  AStream = new TFileStream("e:\\stream.txt", fmOpenRead);
  try {
    tvPlanets->DataController->LoadFromStream(AStream);
  } __finally {
    delete AStream;
  }