unit1.pas

delphi写的简单udp传输

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs,Winsock, StdCtrls,IniFiles;

type
  TForm1 = class(TForm)
    Memo1: TMemo;
    Button1: TButton;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  //客户端套接字
   ClientSocket:TSocket;
   Program_Path:string;//ini文件路径
   ServerIP:string;//服务器IP
implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
var
    args:integer;
    wVersion: WORD;
    iError: integer;
    wWSAData: TWSAData;
    MyIni: TIniFile;//ini文件
begin
    wVersion := MakeWord(2, 0); //要求版本为 WinSocket 2.0
    iError := WSAStartup(wVersion, wWSAData);

    //创建客户端套接字
    ClientSocket:=socket(PF_INET,SOCK_DGRAM,IPPROTO_IP);
    if ClientSocket=INVALID_SOCKET then
    begin
        MessageBox(handle,'创建客户端套接字失败!','提示',mb_ok);
    end
    else
        memo1.Lines.Add('创建客户端套接字成功!');

    Program_Path := ExtractFilePath(Application.ExeName);
    MyIni := TIniFile.Create(Program_Path + 'para.ini'); //调用的文件名
    ServerIP:=MyIni.ReadString('PARA_NORMAL', 'IP', '');//从ini文件中取服务器IP

end;

procedure TForm1.Button1Click(Sender: TObject);
var
    content:string;
    ca:SOCKADDR_IN;
    sendlen:integer;
begin
    content:=trim(memo1.Text );

    ca.sin_family :=PF_INET;
    ca.sin_addr.S_addr:=inet_addr(pchar(ServerIP));
    ca.sin_port:= htons(10000);//设置端口号

    sendlen:=sendto(ClientSocket,content[1],length(content),0,ca,sizeof(ca));
    showmessage(inttostr(sendlen));
    memo1.Clear;
end;

end.