我有一个带有发送按钮的 UDP 信使，但让我很恼火的是我必须按下按钮而不是点击Enter. 所以我创建了程序TForm1.Edit2KeyPress。现在我不知道如何在if (enter is pressed) then {code for sending message}.
回答后我有新问题。我输入的任何内容都会逐个发送。这是我的代码单元chat1；
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, IdSocketHandle, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
Memo1: TMemo;
Edit1: TEdit;
Button2: TButton;
Edit2: TEdit;
Label1: TLabel;
procedure Button1Click(Sender: TObject);
procedure FormActivate(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Edit2KeyPress(Sender: TObject; var Key: Char);
private
Activated: Boolean;
procedure SearchEvent(ResultIP, ResultName: String);
procedure UDPRead(Sender: TObject; AData: TStream;
ABinding: TIdSocketHandle);
procedure UDPException(Sender: TObject);
public
end;
var
Form1: TForm1;
ss:string ;
implementation
uses UDP;
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
begin
UDPSearchForm.SearchEvent := SearchEvent;
UDPSearchForm.Left := Left;
UDPSearchForm.Top := Top;
UDPSearchForm.AktIP := Edit1.Text;
UDPSearchForm.SearchPartner;
end;
procedure TForm1.SearchEvent(ResultIP, ResultName: String);
begin
Edit1.Text := ResultIP;
Label1.Caption := ResultName;
end;
procedure TForm1.FormActivate(Sender: TObject);
var
s, s2: String;
begin
if Activated then exit;
Memo1.Clear;
Activated := true;
UDPSearchForm.OnUDPRead := UDPRead;
UDPSearchForm.OnException := UDPException;
UDPSearchForm.Active := true;
s := UDPSearchForm.LocalAddress;
s2 := UDPSearchForm.WSGetHostByAddr(s);
Memo1.Lines.Add('I''m (' + s + ') ' + s2);
end;
procedure TForm1.UDPRead(Sender: TObject; AData: TStream;
ABinding: TIdSocketHandle);
var
Buffer: Array [0..2047] of Byte;
count: Integer;
PeerIP: String;
PeerPort: Integer;
s: String;
i: Integer;
begin
PeerIP := ABinding.PeerIP;
PeerPort:= ABinding.PeerPort;
count := AData.Size;
if count > Length(Buffer) then begin
exit;
end;
AData.Read(Buffer, count);
if (Buffer[0] <> $00) and (Buffer[0] <> $01) then begin // not search
Edit1.Text:= PeerIP;
end;
case Buffer[0] of
$00: begin // search request
case count of
4: begin
case Buffer[1] of
0: begin
Buffer[0] := $01;
UDPSearchForm.Host := PeerIP;
UDPSearchForm.DoSend(Buffer, 4, Length(Buffer));
Memo1.Lines.Add('Inquiry [' + UDPSearchForm.WSGetHostByAddr(PeerIP) + '(' + PeerIP + ')' + ' Port: ' + IntToStr(PeerPort) +
']');
end;
end;
end;
end;
end;
$01: begin // Search Reply
case count of
4: begin
case Buffer[1] of 0:
begin
ss := UDPSearchForm.WSGetHostByAddr(PeerIP);
s := '[' + ss + '(' + PeerIP + ')' +
' Client Port: ' + IntToStr(PeerPort) +
']';
Memo1.Lines.Add('Inquiry Reply ' + s);
if PeerIp = UDPSearchForm.LocalAddress then begin
ss := '<myself>' + ss;
end;
UDPSearchForm.Add(PeerIP, ss);
end;
end;
end;
end;
end;
$10: begin // Text
case Buffer[1] of
0: begin
s := '';
for i := 4 to count-1 do begin
s := s + char(Buffer[i]);
end;
Memo1.Lines.Add(ss+' says: ' + s);
end;
end;
end;
end;
end;
procedure TForm1.UDPException(Sender: TObject);
begin
//nothing
end;
procedure TForm1.Button2Click(Sender: TObject);
var
x: Array[0..100] of Byte;
i: Integer;
begin
UDPSearchForm.Host := Edit1.Text;
UDPSearchForm.Active := true;
x[0] := $10; // Text
x[1] := 0; // Type 0
for i := 1 to Length(Edit2.Text) do begin
x[i+3] := Byte(Edit2.Text[i]);
end;
UDPSearchForm.DoSend(x, 4+Length(Edit2.Text), length(x));
Memo1.Text:=Memo1.Text+Edit2.Text+#13#10;
end;
procedure TForm1.Edit2KeyPress(Sender: TObject; var Key: Char);
var
x: Array[0..100] of Byte;
i: Integer;
begin
if Ord(Key) = VK_RETURN then
UDPSearchForm.Host := Edit1.Text;
UDPSearchForm.Active := true;
x[0] := $10; // Text
x[1] := 0; // Type 0
for i := 1 to Length(Edit2.Text) do begin
x[i+3] := Byte(Edit2.Text[i]);
end;
UDPSearchForm.DoSend(x, 4+Length(Edit2.Text), length(x));
Memo1.Text:=Memo1.Text+Edit2.Text+#13#10;
end;
end.