memortstream Base64编码和filestream base64编码不同

memorystream base64

function BaseImage(fn: string): string;

var

  m1: TMemoryStream;

  m2: TStringStream;

  str: string;

begin

  m1 := TMemoryStream.Create;

  m2 := TStringStream.Create;

  m1.LoadFromFile(fn);

  EncdDecd.EncodeStream(m1, m2);                       // 将m1的内容Base64到m2中

  str := m2.DataString;

  str := StringReplace(str, #13, '', [rfReplaceAll]);  // 这里m2中数据会自动添加回车换行，所以需要将回车换行替换成空字符

  str := StringReplace(str, #10, '', [rfReplaceAll]);

  result := str;                                       // 返回值为Base64的Stream

  m1.Free;

  m2.Free;

end;

 

filestream base64

需要uses IdCoderMIME；

function TForm1.Base64E(Path: string): string;
var
filepath: string;
filestream: TFileStream;
EncoderMIME: TIdEncoderMIME;
encode_result: string;
begin
EncoderMIME := TIdEncoderMIME.Create(self);
filestream := TFileStream.Create(Path, fmOpenRead);
result := EncoderMIME.Encode(filestream);
filestream.Free;
end;