unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;
function ToUnicode(str:string;dest:PWideChar):integer;
function SendMsg(Toh,From,Msg:string):integer;
function NetMessageBufferSend(servername:PWideChar;
                              MsgName:PWideChar;
                              FromName:PWideChar;
                              Buf: PWideChar;
                              var BufLen:integer):integer;cdecl;
type
  TForm1 = class(TForm)
    Button1: TButton;
    ComboBox1: TComboBox;
    Memo1: TMemo;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation
{$R *.dfm}
function NetMessageBufferSend; external 'netapi32.dll' name 'NetMessageBufferSend';
function ToUnicode(str:string;dest:PWideChar):integer;
var
  len:integer;
begin
  StringToWideChar(str,dest,len);
  Result:=len;
end;
function SendMsg(Toh,From,Msg:string):integer;
var
  ToName :array [0..64] of WideChar;
  WMsgText:array [0..1000] of WideChar;
  MsgLen, i:integer;
begin
  for i := 0 to 64 do ToName[i] := #0;
  ToUnicode(Toh,ToName);
  for i := 0 to 1000 do WMsgText[i] := #0;
  ToUnicode(Msg,WMsgText);
  Result:=NetMessageBufferSend(nil,ToName,nil,@WMsgText,MsgLen);
end;
procedure TForm1.Button1Click(Sender: TObject);
var
size:integer;
begin
 sendmsg('192.168.2.16',',192.168.2.16','kjjkkjkjkj');
end;

end.