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;