如何通过TIdHTTP下载大文件？

问题描述：

我使用此代码下载小文件：

I use this code to download small files:

Var
 ms:TMemoryStream;
begin
  ms:=TMemoryStream.Create;
  Idhttp1.get('http://mydomain.com/myfile.zip',ms);
  ms.SaveToFile('myfile.zip');
  ms.Free;
end;

但是文件在存储到磁盘之前已保存在RAM中，因此可能难以下载> 1Gb的文件，例如。有没有一种按部分下载文件的方法？还是我需要使用WinInet？

But file is saved in RAM before storing to disk, so it may be difficult to download files >1Gb, for example. Is there a way to download a file by its parts? Or do I need to use the WinInet? Thanks in advance!

答

TMemoryStream 提供了一个内存缓冲区，因此，如果您将其下载为一个，则需要有足够的内存来容纳收到的所有内容。不过，这不是唯一的流。您可以根据需要传递 Get 方法任何类型的流，包括将接收到的内容写到磁盘的流。例如，使用 TFileStream 。

TMemoryStream provides an in-memory buffer, so if you download into one, you need to have enough memory to hold everything you receive. It's not the only kind of stream, though. You can pass the Get method any kind of stream you want, including one that writes its contents to disk as it receives it. Use TFileStream, for example.

var
  s: TStream;

s := TFileStream.Create('myfile.zip', fmCreate);
try
  IdHttp1.Get(..., s);
finally
  s.Free;
end;

在任何地方调用 LoadFromFile 或 TMemoryStream 上的$ c> SaveToFile ， TFileStream 可能是一个更好的选择。

Anywhere you call LoadFromFile or SaveToFile on a TMemoryStream, it's possible that TFileStream is a better choice.

如何通过TIdHTTP下载大文件？

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