C# Builder 实现POP3信箱的监视-.NET教程,C#语言-IDC资讯中心

borland的c# builder是一个基于c#语言的编程工具，c# builder允许开发者用java或corba工具开发，c# builder同时也具有从多种数据库中读取数据的能力，可以混合和适应不同开发标准的能力。本文向大家介绍怎样用borland c# builder编写一个信箱监视程序，程序主要是通过winsock来进行网络通信。要实现这个程序，应对pop3协议有一定的了解，下面是对pop3协议的一个粗略的介绍，读者可以参看rfc 1225更为详细地了解该协议。

一、pop3协议简单介绍

　　pop3服务器程序通常在tcp端口110提供服务。当客户想要使用服务时，它便与服务器建立一个tcp连接。一旦连接建立，pop3服务器就向客户发送一条欢迎消息。然后客户开始给服务器发送命令，服务器则给出相应的回答。pop3的命令由一个关键词或者关键词加参数组成。每个命令以回车换行（0xd0xa）作为结束标志。对于所有的命令，pop3服务器都会提供一个回答。服务器的回答由一个状态标志加一些附加信息组成。目前使用的两个标志是“＋ok”和“－err”，分别表示客户的命令是否合法。所有的回答也是以回车换行结束。与本文讨论的话题相关的四个pop3命令是user、pass、stat和quit。

user命令

格式user name

　　其中name是用户在该pop3服务器上的用户标识。客户应该在接到服务器的欢迎消息后或者在上一个user或者pass失败之后可以发送此命令。

pass命令

格式pass string

　　其中string为该用户的密码。客户在发送了user命令并且收到了＋ok的回答之后方可发送此命令。如果用户名和密码都正确，服务器回答＋ok，否则－err。

stat命令

格式stat

stat命令来查看邮箱的情况。stat命令的回应中有两个数字，分别表示邮件的数量和邮件的大小。

quit命令

　　从pop3服务器上退出登录。

二、pop3信箱的监视程序分析

我们准备的做的程序要实现以下功能：

1.托盘图标，程序一运行，只显示一托盘图标，右键点击托盘图标可弹出菜单。

2.获取邮件数量，根据pop3协议，得到邮件的数量。

3.读取和写注册表，注册表中保存服务器、用户名、密码等设置。

4.用户提示信息，这里我们做一个与msn一样的提示窗口。

三、程序实现

下面我们就不妨着手我们的程序。首先，打开borland c# builder，新建一个项目，菜单 file->c# applicaion 项目的名称不妨设为"chkpop3"，图示如下：

[ 相关贴图 ]

设计主窗口，如下图：

[ 相关贴图 ]

主要包括五个文本框，五个标签，三个按钮，一个选择框和一个timer。

winform设置如下：

text:收取邮件

startposition:centerscreen

maximizebox:false

三个按钮:

最小化按钮：最小化窗口，这里就是隐藏主窗口。

取邮件按钮：实现取得pop3信箱中的邮件数量，并用信息窗口提示。

应用按钮：保存设置到注册表中

timer1的功能：完成在一定时间间隔内取pop3信箱中邮件数量。

1.托盘的实现：

从tool palette选择组件contextmenu(加两个菜单项，设置和退出)、notifyicon(text设为：邮箱检测，图标icon选择一个16×16的小图标即可，contextmenu设为前面加入的contextmenu1，visible设为true) 这样一个完整的托盘程序就设好了。

2.用户提示信息的实现：

新建一窗口winform1，把窗体的formborderstyle属性设置为none（无边框模式），然后把topmost属性（总在最上方）属性设置为true，把showintaskbar属性(是否在 windows 任务栏中显示窗体)设置为false，并在窗体上加上一文字标签，将窗体的背景设置为你想要的图片和合适的大小。最后再放上三个timer控件，其中，timer1控制窗体滚出的动画，timer2控制窗体停留时间，timer3控制窗体的滚入动画，将它们的interval属性设置为10，如图：

[ 相关贴图 ]

winform1代码如下：

using system;

using system.drawing;

using system.collections;

using system.componentmodel;

using system.windows.forms;

using system.data;

namespace pop3

{

/// <summary>

/// summary description for winform1.

/// </summary>

public class winform1 : system.windows.forms.form

{

/// <summary>

/// required designer variable.

/// </summary>

private system.componentmodel.icontainer components;

private system.windows.forms.timer timer1;

private system.windows.forms.timer timer2;

private system.windows.forms.timer timer3;

private system.windows.forms.linklabel linklabel1;

public string str_num;

public winform1()

{

//

// required for windows form designer support

//

initializecomponent();

//

// todo: add any constructor code after initializecomponent call

//

}

/// <summary>

/// clean up any resources being used.

/// </summary>

protected override void dispose (bool disposing)

{

if (disposing)

{

if (components != null)

{

components.dispose();

}

}

base.dispose(disposing);

}

private void winform1_load(object sender, system.eventargs e)

{

screen[] screens = screen.allscreens;

screen screen = screens[0];

this.location = new point(screen.workingarea.width – 200, screen.workingarea.height – 30);

this.timer2.interval = 5000;

}

private void scrollup()

{

if(height < 122)

{

this.height += 3;

this.location = new point(this.location.x, this.location.y – 3);

}

else

{

this.timer1.enabled = false;

this.timer2.enabled = true;

}

}

private void scrolldown()

{

if(height > 3)

{

this.height -= 3;

this.location = new point(this.location.x, this.location.y + 3);

}

else

{

this.timer3.enabled = false;

this.close();

}

}

private void timer1_tick(object sender, system.eventargs e)

{

scrollup();

}

private void timer2_tick(object sender, system.eventargs e)

{

timer2.enabled = false;

timer3.enabled = true;

}

private void timer3_tick(object sender, system.eventargs e)

{

scrolldown();

}

public void scrollshow()

{

this.width = 194;

this.height = 0;

this.show();

this.timer1.enabled = true;

}

private void winform1_activated(object sender, system.eventargs e)

{

linklabel1.text="您有"+str_num+"封新邮件！";

}

}

}

具体的实现，可以参考一下网上的一篇文章：《用vc#编写仿msn messager的滚动提示窗口》，已经记不清出处了，可以通过这个网http://yousoft.hi.com.cn/article_view.asp?id=6595浏览。

3.获取邮件数量的实现，代码见下：

string str_server;

if ((tb_server.text!="") && (tb_user.text!="") && (tb_pwd.text!=""))

{

tcpclient tcpc = new tcpclient(tb_server.text,110);

byte[] outbytes;

string input;

networkstream ns = null;

try{

ns = tcpc.getstream();

streamreader sr = new streamreader(ns);

tb_status.text=sr.readline();

input = "user " + tb_user.text + "\r\n";

outbytes = system.text.encoding.ascii.getbytes(input.tochararray());

ns.write(outbytes,0,outbytes.length)

tb_status.text=tb_status.text+"\r\n"+sr.readline();

input = "pass " + tb_pwd.text + "\r\n";

outbytes = system.text.encoding.ascii.getbytes(input.tochararray());

ns.write(outbytes,0,outbytes.length)

tb_status.text=tb_status.text+"\r\n"+sr.readline();

input = "stat" + "\r\n";

outbytes = system.text.encoding.ascii.getbytes(input.tochararray());

ns.write(outbytes,0,outbytes.length)

str_server=sr.readline();

str_num="";

if (str_server.startswith("+ok")){

str_num=str_server.split( )[1];

} else str_num="";

tb_status.text=tb_status.text+"\r\n"+"a:"+str_server;

input = "quit" + "\r\n";

outbytes = system.text.encoding.ascii.getbytes(input.tochararray());

ns.write(outbytes,0,outbytes.length)

tb_status.text=tb_status.text+"\r\n"+"b:"+sr.readline();

}

catch(invalidoperationexception ioe){

tb_status.text="could not connect to mail server";

}

if (str_num!="") {

winform1 form = new winform1();

form.str_num=str_num;

form.scrollshow();

}

程序与邮件服务器建立一个tcp连接，然后发送pop3的一些命令，取到服务器传回的信息，得到邮件的数量。

stat命令的回应中有两个数字，分别表示邮件的数量和邮件的大小。一般格式是这样的“+ok 数量大小”

所以，只要根据服务器返回的信息，提取+ok，然后再按空格分隔得到数量。代码见上。

4.注册表的读写：

我们知道，要实现程序在开机后自己运行，可以通过写注册表hkey_current_user\software\microsoft\windows\currentversion\run实现

另外，为了方便用户，我们把邮件服务器，用户,密码等信息存入注册表，不用每次都再输一次。

保存信息代码如下：

registrykey rk;

registry.currentuser.createsubkey("software\\yousoft");

rk=registry.currentuser.opensubkey("software\\yousoft",true);

rk.setvalue("server",tb_server.text);

rk.setvalue("user",tb_user.text);

rk.setvalue("pwd",tb_pwd.text);

rk.setvalue("interval",tb_mins.text);

if (cb_autorun.checked) {

rk=registry.currentuser.opensubkey("software\\microsoft\\windows\\currentversion\\run",true);

rk.setvalue("chkmail",application.executablepath);

} else

{

rk=registry.currentuser.opensubkey("software\\microsoft\\windows\\currentversion\\run",true);

rk.deletevalue("chkmail");

}

rk.close();

启动程序时读入信息：

private void winform_load(object sender, system.eventargs e)

{

registrykey rk;

rk=registry.currentuser.opensubkey("software\\yousoft",false);

object srv=rk.getvalue("server");

if (srv!=null) tb_server.text=srv.tostring();

object usr=rk.getvalue("user");

if (usr!=null) tb_user.text=usr.tostring();

object pwd=rk.getvalue("pwd");

if (pwd!=null) tb_pwd.text=pwd.tostring();

object mins=rk.getvalue("interval");

if (mins!=null) tb_mins.text=mins.tostring();

rk.close();

}

winform的完整代码如下：

using system;

using system.drawing;

using system.collections;

using system.componentmodel;

using system.windows.forms;

using system.data;

using system.net.sockets;

using system.io;

using system.net;

using microsoft.win32;

namespace pop3

{

/// <summary>

/// summary description for winform.

/// </summary>

public class winform : system.windows.forms.form

{

/// <summary>

/// required designer variable.

/// </summary>

private system.componentmodel.icontainer components;

private system.windows.forms.button button1;

private system.windows.forms.label label1;

private system.windows.forms.label label2;

private system.windows.forms.label label3;

private system.windows.forms.textbox tb_server;

private system.windows.forms.textbox tb_user;

private system.windows.forms.textbox tb_pwd;

private system.windows.forms.textbox tb_status;

private system.windows.forms.notifyicon notifyicon1;

private system.windows.forms.contextmenu contextmenu1;

private system.windows.forms.menuitem menuitem1;

private system.windows.forms.menuitem menuitem2;

private system.windows.forms.menuitem menuitem3;

private bool f_open=true;

private string str_num="";

private system.windows.forms.button button2;

private system.windows.forms.timer timer1;

private system.windows.forms.textbox tb_mins;

private system.windows.forms.label label4;

private system.windows.forms.label label5;

private system.windows.forms.button button3;

private system.windows.forms.checkbox cb_autorun;

public winform()

{

//

// required for windows form designer support

//

initializecomponent();

//

// todo: add any constructor code after initializecomponent call

//

}

#region windows form designer generated code

/// <summary>

/// required method for designer support – do not modify

/// the contents of this method with the code editor.

/// </summary>

private void initializecomponent()

{

this.components = new system.componentmodel.container();

system.resources.resourcemanager resources = new system.resources.resourcemanager(typeof(winform));

this.button1 = new system.windows.forms.button();

this.label1 = new system.windows.forms.label();

this.label2 = new system.windows.forms.label();

this.label3 = new system.windows.forms.label();

this.tb_server = new system.windows.forms.textbox();

this.tb_user = new system.windows.forms.textbox();

this.tb_pwd = new system.windows.forms.textbox();

this.tb_status = new system.windows.forms.textbox();

this.notifyicon1 = new system.windows.forms.notifyicon(this.components);

this.contextmenu1 = new system.windows.forms.contextmenu();

this.menuitem1 = new system.windows.forms.menuitem();

this.menuitem2 = new system.windows.forms.menuitem();

this.menuitem3 = new system.windows.forms.menuitem();

this.button2 = new system.windows.forms.button();

this.timer1 = new system.windows.forms.timer(this.components);

this.tb_mins = new system.windows.forms.textbox();

this.label4 = new system.windows.forms.label();

this.label5 = new system.windows.forms.label();

this.button3 = new system.windows.forms.button();

this.cb_autorun = new system.windows.forms.checkbox();

this.suspendlayout();

//

// button1

//

this.button1.location = new system.drawing.point(152, 176);

this.button1.name = "button1";

this.button1.tabindex = 0;

this.button1.text = "取邮件";

this.button1.click += new system.eventhandler(this.button1_click);

//

// label1

//

this.label1.location = new system.drawing.point(24, 32);

this.label1.name = "label1";

this.label1.size = new system.drawing.size(80, 23);

this.label1.tabindex = 1;

this.label1.text = "邮件服务器：";

//

// label2

//

this.label2.location = new system.drawing.point(48, 64);

this.label2.name = "label2";

this.label2.size = new system.drawing.size(56, 23);

this.label2.tabindex = 2;

this.label2.text = "用户名：";

//

// label3

//

this.label3.location = new system.drawing.point(58, 96);

this.label3.name = "label3";

this.label3.size = new system.drawing.size(48, 23);

this.label3.tabindex = 3;

this.label3.text = "密码：";

//

// tb_server

//

this.tb_server.location = new system.drawing.point(112, 24);

this.tb_server.name = "tb_server";

this.tb_server.size = new system.drawing.size(176, 21);

this.tb_server.tabindex = 4;

this.tb_server.text = "";

this.tb_server.textchanged += new system.eventhandler(this.tb_pwd_textchanged);

//

// tb_user

//

this.tb_user.location = new system.drawing.point(112, 60);

this.tb_user.name = "tb_user";

this.tb_user.size = new system.drawing.size(176, 21);

this.tb_user.tabindex = 5;

this.tb_user.text = "";

this.tb_user.textchanged += new system.eventhandler(this.tb_pwd_textchanged);

//

// tb_pwd

//

this.tb_pwd.location = new system.drawing.point(112, 91);

this.tb_pwd.name = "tb_pwd";

this.tb_pwd.passwordchar = *;

this.tb_pwd.size = new system.drawing.size(176, 21);

this.tb_pwd.tabindex = 6;

this.tb_pwd.text = "";

this.tb_pwd.textchanged += new system.eventhandler(this.tb_pwd_textchanged);

//

// tb_status

//

this.tb_status.location = new system.drawing.point(16, 208);

this.tb_status.multiline = true;

this.tb_status.name = "tb_status";

this.tb_status.size = new system.drawing.size(328, 80);

this.tb_status.tabindex = 7;

this.tb_status.text = "";

//

// notifyicon1

//

this.notifyicon1.contextmenu = this.contextmenu1;

this.notifyicon1.icon = ((system.drawing.icon)(resources.getobject("notifyicon1.icon")));

this.notifyicon1.text = "邮件检测";

this.notifyicon1.visible = true;

//

// contextmenu1

//

this.contextmenu1.menuitems.addrange(new system.windows.forms.menuitem[] {

this.menuitem1,

this.menuitem2,

this.menuitem3});

//

// menuitem1

//

this.menuitem1.index = 0;

this.menuitem1.text = "设置&s";

this.menuitem1.click += new system.eventhandler(this.menuitem1_click);

//

// menuitem2

//

this.menuitem2.index = 1;

this.menuitem2.text = "-";

//

// menuitem3

//

this.menuitem3.index = 2;

this.menuitem3.text = "退出&q";

this.menuitem3.click += new system.eventhandler(this.menuitem3_click);

//

// button2

//

this.button2.location = new system.drawing.point(48, 176);

this.button2.name = "button2";

this.button2.tabindex = 8;

this.button2.text = "最小化";

this.button2.click += new system.eventhandler(this.button2_click);

//

// timer1

//

this.timer1.interval = 5000;

this.timer1.tick += new system.eventhandler(this.timer1_tick);

//

// tb_mins

//

this.tb_mins.location = new system.drawing.point(112, 124);

this.tb_mins.name = "tb_mins";

this.tb_mins.size = new system.drawing.size(144, 21);

this.tb_mins.tabindex = 10;

this.tb_mins.text = "20000";

this.tb_mins.textchanged += new system.eventhandler(this.tb_pwd_textchanged);

//

// label4

//

this.label4.location = new system.drawing.point(32, 128);

this.label4.name = "label4";

this.label4.size = new system.drawing.size(72, 23);

this.label4.tabindex = 9;

this.label4.text = "时间间隔：";

//

// label5

//

this.label5.location = new system.drawing.point(264, 129);

this.label5.name = "label5";

this.label5.size = new system.drawing.size(40, 16);

this.label5.tabindex = 11;

this.label5.text = "毫秒";

//

// button3

//

this.button3.location = new system.drawing.point(264, 176);

this.button3.name = "button3";

this.button3.tabindex = 12;

this.button3.text = "应用";

this.button3.click += new system.eventhandler(this.button3_click);

//

// cb_autorun

//

this.cb_autorun.location = new system.drawing.point(112, 152);

this.cb_autorun.name = "cb_autorun";

this.cb_autorun.size = new system.drawing.size(160, 24);

this.cb_autorun.tabindex = 13;

this.cb_autorun.text = "启动时自动执行";

//

// winform

//

this.autoscalebasesize = new system.drawing.size(6, 14);

this.clientsize = new system.drawing.size(368, 301);

this.controls.add(this.cb_autorun);

this.controls.add(this.button3);

this.controls.add(this.label5);

this.controls.add(this.tb_mins);

this.controls.add(this.label4);

this.controls.add(this.button2);

this.controls.add(this.tb_status);

this.controls.add(this.tb_pwd);

this.controls.add(this.tb_user);

this.controls.add(this.tb_server);

this.controls.add(this.label3);

this.controls.add(this.label2);

this.controls.add(this.label1);

this.controls.add(this.button1);

this.icon = ((system.drawing.icon)(resources.getobject("$this.icon")));

this.maximizebox = false;

this.name = "winform";

this.startposition = system.windows.forms.formstartposition.centerscreen;

this.text = "收取邮件";

this.load += new system.eventhandler(this.winform_load);

this.activated += new system.eventhandler(this.winform_activated);

this.resumelayout(false);

}

#endregion

/// <summary>

/// the main entry point for the application.

/// </summary>

[stathread]

static void main()

{

application.run(new winform());

}

private void button1_click(object sender, system.eventargs e)

{

string str_server;

if ((tb_server.text!="") && (tb_user.text!="") && (tb_pwd.text!=""))

{

tcpclient tcpc = new tcpclient(tb_server.text,110);

byte[] outbytes;

string input;

networkstream ns = null;

try{

ns = tcpc.getstream();

streamreader sr = new streamreader(ns);

tb_status.text=sr.readline();

input = "stat" + "\r\n";

outbytes = system.text.encoding.ascii.getbytes(input.tochararray());

ns.write(outbytes,0,outbytes.length)

str_server=sr.readline();

str_num="";

if (str_server.startswith("+ok")){

str_num=str_server.split( )[1];

} else str_num="";

tb_status.text=tb_status.text+"\r\n"+str_server;

input = "quit" + "\r\n";

outbytes = system.text.encoding.ascii.getbytes(input.tochararray());

ns.write(outbytes,0,outbytes.length)

tb_status.text=tb_status.text+"\r\n"+sr.readline();

}

catch(invalidoperationexception ioe){

tb_status.text="could not connect to mail server";

}

if (str_num!="") {

winform1 form = new winform1();

form.str_num=str_num;

form.scrollshow();

}

}

}

private void winform_activated(object sender, system.eventargs e)

{

if (f_open) {

this.hide();

f_open=false;

}

}

private void menuitem3_click(object sender, system.eventargs e)

{

this.close();

}

private void menuitem1_click(object sender, system.eventargs e)

{

this.show();

this.focus();

}

private void button2_click(object sender, system.eventargs e)

{

this.hide();

}

private void timer1_tick(object sender, system.eventargs e)

{

button1_click(sender,e);

}

private void tb_pwd_textchanged(object sender, system.eventargs e)

{

timer1.enabled=false;

if ((tb_server.text!="") && (tb_user.text!="") && (tb_pwd.text!=""))

{

timer1.interval=system.convert.toint32(tb_mins.text);

timer1.enabled=true;

} else

{

timer1.enabled=false;

}

}

private void button3_click(object sender, system.eventargs e)

{

registrykey rk;

registry.currentuser.createsubkey("software\\yousoft");

rk=registry.currentuser.opensubkey("software\\yousoft",true);

rk.setvalue("server",tb_server.text);

rk.setvalue("user",tb_user.text);

rk.setvalue("pwd",tb_pwd.text);

rk.setvalue("interval",tb_mins.text);

private void winform_load(object sender, system.eventargs e)

{

registrykey rk;

rk=registry.currentuser.opensubkey("software\\yousoft",false);

object srv=rk.getvalue("server");

if (srv!=null) tb_server.text=srv.tostring();

object usr=rk.getvalue("user");

if (usr!=null) tb_user.text=usr.tostring();

object pwd=rk.getvalue("pwd");

if (pwd!=null) tb_pwd.text=pwd.tostring();

object mins=rk.getvalue("interval");

if (mins!=null) tb_mins.text=mins.tostring();

rk.close();

}

}

}

C# Builder 实现POP3信箱的监视-.NET教程,C#语言

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