使用 Delphi 2007 将 Base64 字符串作为二进制文件保存到磁盘 [英] Saving a Base64 string to disk as a binary using Delphi 2007

问题描述

我有一个 Base64 二进制字符串，它是由第 3 方供应商发送给我们的 XML 文档的一部分，我希望能够将其保存回原始文件格式 (jpg).

I have a Base64 binary string that is part of an XML document that is sent to us by a 3rd party supplier, I would like to be able to save it back to its original file format (jpg).

使用此问题的已接受答案 使用 php 将 base64 字符串作为二进制文件保存到磁盘" 我可以毫不费力地将字符串保存为 jpg，因此我知道该字符串的格式很好并且是 JPG 文件.

Using the accepted answer from this question "saving a base64 string to disk as a binary using php" I can save the string to a jpg with little effort, so I know the string is in good form and is a JPG file.

但是我如何在 Delphi 2007 中做到这一点?

But how do I do this in Delphi 2007?

在网上我找到了一个关于如何将 Base64 转换为 TByteDynArray 的教程，并保存它，但它不能正常工作.我也玩过 Indy 的 IdDecoderMIME，但没有成功.

Looking on the net I found a tutorial on how to convert the Base64 into a TByteDynArray, and save that, but it doesn't work right. I have also played about with Indy's IdDecoderMIME, but with with no success.

有谁知道怎么做，或者我应该去哪里找?

Does any one know how to do this, or where I should be looking?

推荐答案

来自 OmniXML 项目的 OmniXMLUtils.pas包含以下功能:

OmniXMLUtils.pas from the OmniXML project contains following functions:

function  Base64Decode(encoded, decoded: TStream): boolean; overload;
function  Base64Decode(const encoded: string; decoded: TStream): boolean; overload;
function  Base64Decode(const encoded: string; var decoded: string): boolean; overload;
function  Base64Decode(const encoded: string): string; overload;
procedure Base64Encode(decoded, encoded: TStream); overload;
procedure Base64Encode(decoded: TStream; var encoded: string); overload;
function  Base64Encode(decoded: TStream): string; overload;
function  Base64Encode(const decoded: string): string; overload;
procedure Base64Encode(const decoded: string; var encoded: string); overload;

Base64Decode(string, TStream) 应该可以解决问题.对于 TStream 参数，您可以像这样传递 TFileStream:

The Base64Decode(string, TStream) should do the trick. For the TStream parameter you can pass it TFileStream like this:

procedure SaveBase64ToFile(const encoded, fileName: string);
var
  fs: TFileStream;
begin
  fs := TFileStream.Create(fileName, fmCreate);
  try
    if not Base64Decode(encoded, fs) then
      raise Exception.Create('Invalid data!');
  finally FreeAndNil(fs); end;
end;

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