Delphi XE-7和Indy 10.6.0.5169的简单UDP示例/演示应用程序

Question

我正在寻找Delphi XE-7和Indy 10.6.0.5169的简单UDP示例/演示应用程序。

我已经寻找了一段时间，我发现的所有内容都是针对不再编译的Indy或Delphi的旧版本。

我需要实现UDP客户端才能处理WS-Discovery消息。

我尝试使用此处列出的应用程序：

http://delphi.about.com/library/weekly/code/src101105.zip

SendBuffer在这里给我一个错误：

procedure TUDPSearchForm.SearchPartner;
var
  x: Array[0..3] of Byte;
begin
  RadioGroup1.Items.Clear;
  RadioGroup1.ItemIndex := -1;
  Height := 50+13;
  Top := Top;
  Left := left;
  Show;
  IdUDPClient1.Host := '255.255.255.255';
  IdUDPClient1.Active := true;
  IdUDPClient1.BroadcastEnabled := True;
  x[0] := $00; // Search Receivers
  x[1] := $00; // Search
  x[2] := MessageCount div $100;
  x[3] := MessageCount mod $100;
  inc(MessageCount);
  IdUDPClient1.Port := UDPDefaultPort;
  IdUDPClient1.SendBuffer(x, 4);
  IdUDPClient1.BroadcastEnabled := False;
end;

Answer 1

该示例适用于TIdBytes 。对于Indy 10，您必须使用TIdBytes而不是固定数组，例如：

procedure TUDPSearchForm.SearchPartner;
var
  x: TIdBytes;
begin
  RadioGroup1.Items.Clear;
  RadioGroup1.ItemIndex := -1;
  Height := 50+13;
  Top := Top;
  Left := left;
  Show;
  IdUDPClient1.Host := '255.255.255.255';
  IdUDPClient1.Active := true;
  IdUDPClient1.BroadcastEnabled := True;
  SetLength(x, 4);
  x[0] := $00; // Search Receivers
  x[1] := $00; // Search
  x[2] := MessageCount div $100;
  x[3] := MessageCount mod $100;
  inc(MessageCount);
  IdUDPClient1.Port := UDPDefaultPort;
  IdUDPClient1.SendBuffer(x);
  IdUDPClient1.BroadcastEnabled := False;
end;

您可以使用Broadcast()方法代替SendBuffer()来稍微简化代码：

procedure TUDPSearchForm.SearchPartner;
var
  x: TIdBytes;
begin
  RadioGroup1.Items.Clear;
  RadioGroup1.ItemIndex := -1;
  Height := 50+13;
  Top := Top;
  Left := left;
  Show;
  SetLength(x, 4);
  x[0] := $00; // Search Receivers
  x[1] := $00; // Search
  x[2] := MessageCount div $100;
  x[3] := MessageCount mod $100;
  inc(MessageCount);
  IdUDPClient1.Broadcast(x, UDPDefaultPort);
end;