如何将Delphi Stream传递给c / c ++ DLL [英] How to pass a Delphi Stream to a c/c++ DLL

问题描述

可以将Delphi流（TStream descendant）传递给用c / c ++编写的DLL吗？ DLL将以Microsoft c / c ++编写。如果这是不可能的，我们如何使用C ++ Builder来创建DLL？或者，有没有可以在Microsoft C / C ++和Delphi之间共享的Stream（FIFO）类？

Is it possible to pass a Delphi stream (TStream descendant) to a DLL written in c/c++? DLL will be written in Microsoft c/c++. If that is not possible, how about if we use C++ Builder to create the DLL? Alternatively, are there any Stream (FIFO) classes which can be shared between Microsoft C/C++ and Delphi?

谢谢！

推荐答案

您可以使用 IStream 和 TStreamAdapter 。这是一个快速的例子（在D2007和XE2中测试）：

You can do this using IStream and TStreamAdapter. Here's a quick example (tested in D2007 and XE2):

uses
  ActiveX;

procedure TForm1.DoSomething;
var
  MemStream: TMemoryStream;
  ExchangeStream: IStream;
begin
  MemStream := TMemoryFile.Create;
  try
    MemStream.LoadFromFile('C:\Test\SomeFile.txt');
    MemStream.Position := 0;
    ExchangeStream := TStreamAdapter.Create(MemStream) as IStream;
    // Pass ExchangeStream to C++ DLL here, and do whatever else
  finally
    MemStream.Free;
  end;
end;

以防万一，如果你需要去另一种方式（收到一个来自C / C ++的IStream ），您可以使用 TOleStream 从 IStream 获取到Delphi TStream 。

Just in case, if you need to go the other way (receiving an IStream from C/C++), you can use TOleStream to get from that IStream to a Delphi TStream.

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