rest api上传和下载文件

rest api上传和下载文件

function FileToString(AFileName: string): string;
var
  LMemoryStream: TMemoryStream;
  LStringStream: TStringStream;
  LDstStream: TMemoryStream;
begin
  Result := '';
  if not FileExists(AFileName) then
    Exit;
  LMemoryStream := TMemoryStream.Create;
  LStringStream := TStringStream.Create;
  LDstStream := TMemoryStream.Create;
  try
    LMemoryStream.LoadFromFile(ExtractFilePath(ParamStr(0)) + AFileName);
    LMemoryStream.Position := 0;
    ZCompressStream(LMemoryStream, LDstStream);
    LDstStream.Position := 0;
    TNetEncoding.Base64.Encode(LDstStream, LStringStream);
    Result := LStringStream.DataString;
  finally
    LMemoryStream.Free;
    LStringStream.Free;
    LDstStream.Free;
  end;
end;

　　

procedure FileFromString(AFileName, AFileContent: string);
var
  LStringStream: TStringStream;
  LMemoryStream: TMemoryStream;
  LOrgStream: TMemoryStream;
begin
  if AFileName = '' then
    Exit;
  LStringStream := TStringStream.Create(AFileContent);
  LMemoryStream := TMemoryStream.Create;
  LOrgStream := TMemoryStream.Create;
  try
    LStringStream.Position := 0;
    TNetEncoding.Base64.Decode(LStringStream, LOrgStream);
    LOrgStream.Position := 0;
    ZDecompressStream(LOrgStream, LMemoryStream);
    LMemoryStream.Position := 0;
    LMemoryStream.SaveToFile(ExtractFileName(AFileName));
  finally
    LStringStream.Free;
    LMemoryStream.Free;
    LOrgStream.Free;
  end;
end;