Delphi ActiveX

Send a 32-bit Integer over a Socket

Demonstrates Socket.SendInt32, which sends a value as a four-byte signed integer in the selected byte order.

Background. Fixed-size integers and length prefixes are common building blocks for application-defined binary protocols. Byte order is selectable, with big-endian being network byte order.

Chilkat Delphi ActiveX Downloads

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Delphi ActiveX

var
success: Integer;
socket: TChilkatSocket;
bTls: Integer;
maxWaitMs: Integer;
bBigEndian: Integer;

begin
success := 0;

socket := TChilkatSocket.Create(Self);

//  Connect to the server using TLS.
bTls := 1;
maxWaitMs := 5000;
success := socket.Connect('example.com',5000,bTls,maxWaitMs);
if (success = 0) then
  begin
    Memo1.Lines.Add(socket.LastErrorText);
    Exit;
  end;

//  Send the value as a four-byte signed integer.  Use 1 for network byte order (big-endian) or
//  0 for little-endian.
bBigEndian := 1;
success := socket.SendInt32(1000000,bBigEndian);
if (success = 0) then
  begin
    Memo1.Lines.Add(socket.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add('32-bit integer sent.');