Indy 9 TCP client text encoding

Indy 9 TCP client text encoding

By : Soeun Sokmeng
Date : November 16 2020, 06:23 AM
around this issue Indy 9 does not support encodings, and also does not support Delphi 2009+ for Unicode. Everything in Indy 9 assumes/is based on AnsiString only. Strings are transmitted as-is as if they were raw byte arrays.
So, don't send your AnsiString data over a connection using ANSI. You can send/receive it as UTF-8 instead. You just have to encode/decode the AnsiString data manually, that's all. Indy 9 will send a UTF-8 encoded AnsiString as-is, and read a UTF-8 encoded AnsiString as-is. You can then encode/decode the AnsiString data to/from UTF-8 as needed in your surrounding code.
code :
IdTCPClient1.WriteLn(UTF8Encode('Some Unicode String Here'));
S := UTF8Decode(IdTCPClient1.ReadLn);
AContext.Connection.IOHandler.DefStringEncoding := TIdTextEncoding.UTF8;
S := AContext.Connection.IOHandler.ReadLn;

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Freepascal, Indy SVN trunk version, nothing received by PHP client when transfering XML, until removing encoding convers

Freepascal, Indy SVN trunk version, nothing received by PHP client when transfering XML, until removing encoding convers

By : Sujitha Manivannanan
Date : March 29 2020, 07:55 AM
I wish this help you Indy calls TIdTextEncoding.Convert() when it thinks the two encodings are different so bytes can be converted from one charset to another. However, Indy does not yet detect when two TIdTextEncoding objects represent the same charset so the conversion can be skipped. That is mainly due to a limitation in Embarcadero's SysUtils.TEncoding class in Delphi 2009-XE, which does not expose that information (in Delphi XE2, TEncoding received new EncodingName and CodePage properties, but Indy has not been updated to utilize them yet). Indy's TIdTextEncoding class is an alias for TEncoding in Delphi 2009+, and is modeled after TEncoding in Delphi 5-2007 and FreePascal, in order to maintain a single API throughout Indy's codepage.
Indy currently just compares TIdTextEncoding object pointers to each other, which is fine when using the standard encodings from the TIdTextEncoding class properties, as they are implemented as singleton objects in memory. However, if you mix in TIdTextEncoding objects that are obtained by the TIdTextEncoding.GetEncoding() method, such as from Indy's CharsetToEncoding() function, then the object pointers will not match even if their charsets do. In ideal conditions, that would be a no-op conversion from charset to Unicode back to the same charset.
Indy 10 Encoding

Indy 10 Encoding

By : Thisara Ashan
Date : March 29 2020, 07:55 AM
like below fixes the issue DefStringEncoding is not a class property, which is why you cannot access it via the TIdIOHandler class type like you attempted to do. It is an instance property instead, so you need a pointer to an instance of a TIdIOHandler object.
In the OnCommand events, you can reach the TIdIOHandler object via the TIdCommand.Context.Connection.IOHandler property.
Encoding in Indy 10 and Delphi

Encoding in Indy 10 and Delphi

By : user2181976
Date : March 29 2020, 07:55 AM
should help you out I am using Indy 10 with Delphi. Following is my code which uses EncodeString method of Indy to encode a string. ,
What is the purpose of IndyTextEncoding_OSDefault?
code :
function IndyTextEncoding_OSDefault: IIdTextEncoding;
  if GIdOSDefaultEncoding = nil then begin
    LEncoding := TIdMBCSEncoding.Create;
    if InterlockedCompareExchangeIntf(IInterface(GIdOSDefaultEncoding), LEncoding, nil) <> nil then begin
      LEncoding := nil;
  Result := GIdOSDefaultEncoding;
constructor TIdMBCSEncoding.Create;
  Create(CP_ACP, 0, 0);
function IndyTextEncoding_Default: IIdTextEncoding;
  LType: IdTextEncodingType;
  LType := GIdDefaultTextEncoding;
  if LType = encIndyDefault then begin
    LType := encASCII;
  Result := IndyTextEncoding(LType);
How to send video converted to bitmap to Client using Indy TCPServer/Client?

How to send video converted to bitmap to Client using Indy TCPServer/Client?

By : Penelusuran Artikel
Date : March 29 2020, 07:55 AM
may help you . You have the bitmap in a TBitmap object. The simplest solution would be to save that to a TStream using TBitmap.SaveToStream(), then transmit it using Indy's TIdIOHandler.Write(TStream) and TIdIOHandler.ReadStream() methods.
Delphi Indy - How to get SSL certificates for a SSL-TCP Client/Server link with Indy 10

Delphi Indy - How to get SSL certificates for a SSL-TCP Client/Server link with Indy 10

By : AbeL
Date : March 29 2020, 07:55 AM
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