我想用UDP来发送一条纪录，请问NMUDP控件能实现吗？

Question

[发送]
var
  TheStudentArray: array[0..100] of char;
  TmpStr: string;
  TmpI: Integer;  TmpStr := Edit1.Text + '#' + Edit2.Text + '#' + Edit3.Text + '#';
  for TmpI := 0 to Length( TmpStr ) - 1 do
    TheStudentArray[TmpI] := TmpStr[TmpI];
  NMUDP1.ReportLevel := Status_Basic;
  NMUDP1.SendBuffer( TheStudentArray, Length( TmpStr ) );[接收]
var
  RecBuffer: array[0..100] of Char;
  RecLen, TmpI: Integer;
  RecStr: string;  NMUDP1.ReadBuffer( RecBuffer, RecLen );
  SetLength( RecStr, RecLen );
  for TmpI := 0 to RecLen -1 do
    RecStr[TmpI] := RecBuffer[TmpI];
  Memo1.Lines.Add( FromIP + ':' + RecStr );将记录值以字符串的形式发送的，串间以特殊字符间隔区分。
接收后从字符串中获取有用信息

Answer 1

如果是LAN且网络状况稳定的话可以用UDP,不过TCP更安全稳定些,也不需要显示地通知发送端已成功接收了记录,建议你用TCP组件做,UDP不是很理想!

Answer 2

unit Unit_client;interfaceuses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  ScktComp, StdCtrls, ComCtrls, ExtCtrls;type
  TForm1 = class(TForm)
    S1: TStatusBar;
    M1: TMemo;
    Client: TClientSocket;
    Edit1: TEdit;
    Button1: TButton;
    Bevel1: TBevel;
    Label1: TLabel;
    edtHost: TEdit;
    Label2: TLabel;
    edtPort: TEdit;
    btnConnect: TButton;
    bntDisConnect: TButton;
    procedure ClientConnect(Sender: TObject;
      Socket: TCustomWinSocket);
    procedure ClientRead(Sender: TObject; Socket: TCustomWinSocket);
    procedure ClientDisconnect(Sender: TObject; Socket: TCustomWinSocket);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure M1Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure btnConnectClick(Sender: TObject);
    procedure Edit1KeyPress(Sender: TObject; var Key: Char);
    procedure FormCreate(Sender: TObject);
    procedure bntDisConnectClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;var
  Form1: TForm1;
  TotalLen:Integer;implementation
uses  ShellAPI;
{$R *.DFM}procedure TForm1.ClientConnect(Sender: TObject;
  Socket: TCustomWinSocket);
begin
S1.Panels.Items[0].Text:='Connect Received';
S1.Panels.items[1].text:='';
end;procedure TForm1.ClientRead(Sender: TObject; Socket: TCustomWinSocket);
var
  re:pchar;
  sbuf:string;
  relong:integer;
begin
    re:=nil;
    while socket.ReceiveLength>0 do
      begin
        //申请内存
        re:=AllocMem(socket.receivelength);
      TRY
        relong:=socket.ReceiveLength;
        Socket.ReceiveBuf(re^,Socket.receivelength);
        sBuf:=strpas(re);
        Setlength(sbuf,relong);        //count lenght
        TotalLen:=TotalLen+ relong;
        S1.Panels.Items[1].Text:='Total Received (Byte): ' + IntToStr(TotalLen);
        S1.Update();
      FINALLY
        freemem(re);
      END;
    M1.Lines.Add(sbuf);
  end;
end;procedure TForm1.ClientDisconnect(Sender: TObject;
  Socket: TCustomWinSocket);
begin
  S1.Panels.Items[0].Text:='Close Connect With Host';
  S1.Panels.Items[0].Text:='';
  M1.Lines.Clear;
  edit1.Text:='';
end;procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  if Client.Active then
    Client.Close;
end;procedure TForm1.M1Click(Sender: TObject);
begin
Edit1.SetFocus;
end;procedure TForm1.Button1Click(Sender: TObject);
begin
    ShellExecute(self.handle,nil,Pchar(Application.EXEname),nil,nil,SW_Normal);
end;procedure TForm1.btnConnectClick(Sender: TObject);
begin
    Client.Address:=edtHost.Text;
    Client.Port:=strtoint(edtPort.Text);
    Client.Active:=true;
end;procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
begin
if key=#13 then
  begin
    if not Client.Active then
        btnConnectClick(Sender);
    Client.Socket.SendText(Edit1.Text);
    edit1.SelectAll;
    key:=#0;
  end;
end;procedure TForm1.FormCreate(Sender: TObject);
begin
    edtHost.Text:='10.14.61.70';
    edtPort.Text:='7';
    TotalLen:=0;
end;procedure TForm1.bntDisConnectClick(Sender: TObject);
begin
    Client.Active:=False;
end;end.
客户端

Answer 3

  服务端:
unit Unit_Server;interfaceuses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  ComCtrls, StdCtrls, ScktComp,Winsock, ExtCtrls;type
  TForm1 = class(TForm)
    Server: TServerSocket;
    m1: TMemo;
    S1: TStatusBar;
    btnSend: TButton;
    edtSend: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    btnOneSend: TButton;
    Label3: TLabel;
    Label4: TLabel;
    Bevel1: TBevel;
    cbxID: TComboBox;
    procedure ServerClientConnect(Sender: TObject;
      Socket: TCustomWinSocket);
    procedure ServerClientRead(Sender: TObject; Socket: TCustomWinSocket);
    procedure FormCreate(Sender: TObject);
    procedure ServerAccept(Sender: TObject; Socket: TCustomWinSocket);
    procedure ServerClientError(Sender: TObject; Socket: TCustomWinSocket;
      ErrorEvent: TErrorEvent; var ErrorCode: Integer);
    procedure btnSendClick(Sender: TObject);
    procedure ServerClientDisconnect(Sender: TObject;
      Socket: TCustomWinSocket);
    procedure btnOneSendClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
Type UsrRec=Record
              SocketID:Integer;
              UsrName:string;
              Passwd:string;
              IP:string;
              ReceivingData:string;
              End;var
  Form1: TForm1;
  buf:string;
  bEUserName,bEPasswd:Boolean;
  Usr:^UsrRec;implementation{$R *.DFM}procedure TForm1.ServerClientConnect(Sender: TObject;
  Socket: TCustomWinSocket);
Var
  strIp,strHost:string;
  Count:Integer;
begin
  strIp:=Socket.RemoteAddress;
  strHost:=Socket.RemoteHost;
  M1.Lines.Add('SomeOne Login From');
  M1.Lines.add(#9'SocketID:'+Inttostr(Socket.SocketHandle));
  cbxID.Items.Add(Inttostr(Socket.SocketHandle));
  M1.lines.add(#9'IP:'+strIp);
  M1.Lines.Add(#9'Host:'+strHost);
  Count:=Server.Socket.ActiveConnections;
  S1.Panels.Items[1].Text:='OnLine user: '+IntToStr(Count);
end;procedure TForm1.ServerClientRead(Sender: TObject;
  Socket: TCustomWinSocket);
var
  p:pchar;
  length:longint;
  Count,i:Integer;
begin
    p:=nil;
    while socket.ReceiveLength>0 do begin
        length:=socket.receivelength;
        Getmem(p,length);
        TRY
            socket.ReceiveBuf(p^,socket.receivelength);
            Count:=Server.Socket.ActiveConnections;
            for i:=0 to Count-1 do
                Server.Socket.Connections[i].SendBuf(p^,length);
        FINALLY
            FreeMem(p);
        END;
    end;
end;procedure TForm1.FormCreate(Sender: TObject);
begin
    //start server when application run
    Server.Active:=true;
    S1.Panels.Items[0].Text:='Server Starts. Host:'+Server.Socket.LocalHost+'  Port:'+inttostr(Server.Port);
    self.Caption:=S1.Panels.Items[0].Text;
    Application.Title:=S1.Panels.Items[0].Text;
    S1.Panels.Items[1].Text:='OnLine user Count: '+IntToStr(Server.Socket.ActiveConnections);
end;procedure TForm1.ServerAccept(Sender: TObject; Socket: TCustomWinSocket);
var
  Tempstr:pchar;
begin
    TempStr:=pchar('Welcome To Chat Test Server    '#13#10);
    socket.SendText(TempStr);
    TempStr:=pchar('#######################################'#13#10);
    socket.SendText(TempStr);
    TempStr:=pchar('All your words will be sent to all online people'#13#10);
    socket.SendText(TempStr);
end;procedure TForm1.ServerClientError(Sender: TObject;
  Socket: TCustomWinSocket; ErrorEvent: TErrorEvent;
  var ErrorCode: Integer);
begin
//Error Conditions
Case ErrorCode Of
  10054:M1.lines.add('one connection is reset by remote side.');
  Else
    M1.Lines.Add('Error Happen, Error Code:'+InttoStr(errorCode));
End;
ErrorCode:=0;
end;procedure TForm1.btnSendClick(Sender: TObject);
var
  i:integer;
  Count:Integer;
begin
    Count:=Server.Socket.ActiveConnections;
    for i:=0 to Count-1 do
      Server.Socket.Connections[i].SendText(edtSend.text);
end;procedure TForm1.ServerClientDisconnect(Sender: TObject;
  Socket: TCustomWinSocket);
Var
    Count:Integer;
    IDIndex:Integer;
begin
    M1.Lines.add('Usr Offline');
    M1.Lines.add('      SocketID:'+Inttostr(Socket.SocketHandle));
    IDIndex:=cbxID.Items.IndexOf( Inttostr(Socket.SocketHandle));
    cbxID.Items.Delete(IDIndex);
    //this event happens before user leave
    Count:=Server.Socket.ActiveConnections-1;
    S1.Panels.Items[1].Text:='OnLine user:'+Inttostr(Count);
end;procedure TForm1.btnOneSendClick(Sender: TObject);
var
  ID:Integer;
  Socket:TCustomWinSocket;
begin
  if cbxID.Text='' then
    exit;  
  ID:=strtoint(cbxID.text);
  //Create a socket with exist socket handle
  Socket:=TCustomWinSocket.Create(ID);
  Socket.SendText(EdtSend.text);
end;end.