| 发表于：2007-09-06 00:30:33 楼主 |
using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.text;
using system.net;
using system.net.sockets;
using system.windows.forms;
namespace easychat
{
public partial class login_frm : form
{
/// <summary>
/// ip地址
/// </summary>
private ipaddress _ipaddr;
#region 登录窗体构造函数
/// <summary>
/// 构造函数，自动生成
/// </summary>
public login_frm（)
{
initializecomponent（);
}
#endregion
#region 登录窗体的私有方法
/// <summary>
/// 验证登录信息
/// </summary>
/// <returns> 验证结果 </returns>
private bool validateinfo（)
{
if （user_tb.text.trim（) == string.empty)
{
messagebox.show（ "请填写用户名！ ",
"提示 ",
messageboxbuttons.ok,
messageboxicon.information);
return false;
}
if （!ipaddress.tryparse（svrip_tb.text, out _ipaddr))
{
messagebox.show（ "ip地址不合法! ",
"提示 ",
messageboxbuttons.ok,
messageboxicon.information);
return false;
}
int _port;
if （!int.tryparse（svrport_tb.text, out _port))
{
messagebox.show（ "端口号不合法! ",
"提示 ",
messageboxbuttons.ok,
messageboxicon.information);
return false;
}
else
{
if （_port < 1024 ¦ ¦ _port > 65535)
{
messagebox.show（ "端口号不合法! ",
"提示 ",
messageboxbuttons.ok,
messageboxicon.information);
return false;
}
}
return true;
}
/// <summary>
/// 取消，关闭窗体
/// </summary>
/// <param name= "sender "> </param>
/// <param name= "e "> </param>
private void cancel_btn_click（object sender, eventargs e)
{
this.close（);
}
/// <summary>
/// 登录
/// </summary>
/// <param name= "sender "> </param>
/// <param name= "e "> </param>
private void login_btn_click（object sender, eventargs e)
{
//验证数据合法性
if （!validateinfo（))
{
return;
}
int port = int.parse（svrport_tb.text);
//向服务器发出连接请求
tcpconnection conn = new tcpconnection（_ipaddr, port);
tcpclient _tcpc = conn.connect（);
if （_tcpc == null)
{
messagebox.show（ "无法连接到服务器，请重试！ ",
"错误 ",
messageboxbuttons.ok,
messageboxicon.exclamation);
}
else
{
networkstream netstream = _tcpc.getstream（);
//向服务器发送用户名以确认身份
netstream.write（encoding.unicode.getbytes（user_tb.text), 0, encoding.unicode.getbytes（user_tb.text).length);
//得到登录结果
byte[] buffer = new byte[50];
netstream.read（buffer, 0, buffer.length);
string connresult = encoding.unicode.getstring（buffer).trimend（ '\0 ');
if （connresult.equals（ "cmd::failed "))
{
messagebox.show（ "您的用户名已经被使用，请尝试其他用户名! ",
"提示 ",
messageboxbuttons.ok,
messageboxicon.information);
return;
}
else
{
string svrskt = svrip_tb.text + ": " + svrport_tb.text;
chat_frm chatfrm = new chat_frm（user_tb.text, netstream, svrskt);
chatfrm.owner = this;
this.hide（);
chatfrm.show（);
}
}
}
/// <summary>
/// 初始化登录信息
/// </summary>
/// <param name= "sender "> </param>
/// <param name= "e "> </param>
private void login_frm_load（object sender, eventargs e)
{
svrip_tb.text = "127.0.0.1 ";
svrport_tb.text = "8888 ";
user_tb.focus（);
}
#endregion
}
} |
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