WinForm C#拨号程序代码

此程序可以实现系统拨号找到系统的拨号设置，然后再拨号成功后，显示拨号状态，非原创，用C#移植了一下，原文参见CodeProject中关于Web 实现拨号的文章。

下面是拨号需要用到的文件，一个RAS自定义类，添加到工程文件中就可用，C#的

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using System;
using System.Runtime.InteropServices;
using System.Text;

namespace Dialup.RAS
{
public enum RasFieldSizeConstants
{
RAS_MaxDeviceType = 16,
RAS_MaxPhoneNumber = 128,
RAS_MaxIpAddress = 15,
RAS_MaxIpxAddress = 21,
#if WINVER4
RAS_MaxEntryName =256,
RAS_MaxDeviceName =128,
RAS_MaxCallbackNumber =RAS_MaxPhoneNumber,
#else
RAS_MaxEntryName = 20,
RAS_MaxDeviceName = 32,
RAS_MaxCallbackNumber = 48,
#endif

RAS_MaxAreaCode = 10,
RAS_MaxPadType = 32,
RAS_MaxX25Address = 200,
RAS_MaxFacilities = 200,
RAS_MaxUserData = 200,
RAS_MaxReplyMessage = 1024,
RAS_MaxDnsSuffix = 256,
UNLEN = 256,
PWLEN = 256,
DNLEN = 15
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct GUID
{
public uint Data1;
public ushort Data2;
public ushort Data3;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
public byte[] Data4;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct RASCONN
{
public int dwSize;
public IntPtr hrasconn;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = (int)RasFieldSizeConstants.RAS_MaxEntryName + 1)]
public string szEntryName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = (int)RasFieldSizeConstants.RAS_MaxDeviceType + 1)]
public string szDeviceType;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = (int)RasFieldSizeConstants.RAS_MaxDeviceName + 1)]
public string szDeviceName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]//MAX_PAPTH=260
public string szPhonebook;
public int dwSubEntry;
public GUID guidEntry;
#if (WINVER501)
int dwFlags;
public LUID luid;
#endif
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct LUID
{
int LowPart;
int HighPart;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct RasEntryName
{
public int dwSize;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = (int)RasFieldSizeConstants.RAS_MaxEntryName + 1)]
public string szEntryName;
#if WINVER5
public int dwFlags;
[MarshalAs(UnmanagedType.ByValTStr,SizeConst=260+1)]
public string szPhonebookPath;
#endif
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public class RasStats
{
public int dwSize = Marshal.SizeOf(typeof(RasStats));
public int dwBytesXmited;
public int dwBytesRcved;
public int dwFramesXmited;
public int dwFramesRcved;
public int dwCrcErr;
public int dwTimeoutErr;
public int dwAlignmentErr;
public int dwHardwareOverrunErr;
public int dwFramingErr;
public int dwBufferOverrunErr;
public int dwCompressionRatioIn;
public int dwCompressionRatioOut;
public int dwBps;
public int dwConnectDuration;
}

public class RAS
{

[DllImport("Rasapi32.dll", EntryPoint = "RasEnumConnectionsA",
SetLastError = true)]

public static extern int RasEnumConnections
(
ref RASCONN lprasconn, // buffer to receive connections data
ref int lpcb, // size in bytes of buffer
ref int lpcConnections // number of connections written to buffer
);

[DllImport("rasapi32.dll", CharSet = CharSet.Auto)]
public static extern uint RasGetConnectionStatistics(
IntPtr hRasConn, // handle to the connection
[In, Out]RasStats lpStatistics // buffer to receive statistics
);
[DllImport("rasapi32.dll", CharSet = CharSet.Auto)]
public extern static uint RasHangUp(
IntPtr hrasconn // handle to the RAS connection to hang up
);

[DllImport("rasapi32.dll", CharSet = CharSet.Auto)]
public extern static uint RasEnumEntries(
string reserved, // reserved, must be NULL
string lpszPhonebook, // pointer to full path and
// file name of phone-book file
[In, Out]RasEntryName[] lprasentryname, // buffer to receive
// phone-book entries
ref int lpcb, // size in bytes of buffer
out int lpcEntries // number of entries written
// to buffer
);

[DllImport("wininet.dll", CharSet = CharSet.Auto)]
public extern static int InternetDial(
IntPtr hwnd,
[In]string lpszConnectoid,
uint dwFlags,
ref int lpdwConnection,
uint dwReserved
);

public RAS()
{

}
}

public class RASDisplay
{
private string m_duration;
private string m_ConnectionName;
private string[] m_ConnectionNames;
private double m_TX;
private double m_RX;
private bool m_connected;
private IntPtr m_ConnectedRasHandle;

public RASDisplay()
{
m_connected = true;

RAS lpras = new RAS();
RASCONN lprasConn = new RASCONN();

lprasConn.dwSize = Marshal.SizeOf(typeof(RASCONN));
lprasConn.hrasconn = IntPtr.Zero;

int lpcb = 0;
int lpcConnections = 0;
int nRet = 0;
lpcb = Marshal.SizeOf(typeof(RASCONN));

nRet = RAS.RasEnumConnections(ref lprasConn, ref lpcb, ref
lpcConnections);

if (nRet != 0)
{
m_connected = false;
return;
}

if (lpcConnections > 0)
{
RasStats stats = new RasStats();

m_ConnectedRasHandle = lprasConn.hrasconn;
RAS.RasGetConnectionStatistics(lprasConn.hrasconn, stats);

m_ConnectionName = lprasConn.szEntryName;

int Hours = 0;
int Minutes = 0;
int Seconds = 0;

Hours = ((stats.dwConnectDuration / 1000) / 3600);
Minutes = ((stats.dwConnectDuration / 1000) / 60) - (Hours * 60);
Seconds = ((stats.dwConnectDuration / 1000)) - (Minutes * 60) - (Hours * 3600);

m_duration = Hours + " hours " + Minutes + " minutes " + Seconds + " secs";
m_TX = stats.dwBytesXmited;
m_RX = stats.dwBytesRcved;
}
else
{
m_connected = false;
}

int lpNames = 1;
int entryNameSize = 0;
int lpSize = 0;
RasEntryName[] names = null;

entryNameSize = Marshal.SizeOf(typeof(RasEntryName));
lpSize = lpNames * entryNameSize;

names = new RasEntryName[lpNames];
names[0].dwSize = entryNameSize;

uint retval = RAS.RasEnumEntries(null, null, names, ref lpSize, out lpNames);

//if we have more than one connection, we need to do it again
if (lpNames > 1)
{
names = new RasEntryName[lpNames];
for (int i = 0; i < names.Length; i++)
{
names[i].dwSize = entryNameSize;
}

retval = RAS.RasEnumEntries(null, null, names, ref lpSize, out lpNames);

}
m_ConnectionNames = new string[names.Length];

if (lpNames > 0)
{
for (int i = 0; i < names.Length; i++)
{
m_ConnectionNames[i] = names[i].szEntryName;
}
}
}

public string Duration
{
get
{
return m_connected ? m_duration : "";
}
}

public string[] Connections
{
get
{
return m_ConnectionNames;
}
}

public double BytesTransmitted
{
get
{
return m_connected ? m_TX : 0;
}
}
public double BytesReceived
{
get
{
return m_connected ? m_RX : 0;
}
}
public string ConnectionName
{
get
{
return m_connected ? m_ConnectionName : "";
}
}
public bool IsConnected
{
get
{
return m_connected;
}
}

public int Connect(string Connection)
{
int temp = 0;
uint INTERNET_AUTO_DIAL_UNATTENDED = 2;
int retVal = RAS.InternetDial(IntPtr.Zero, Connection, INTERNET_AUTO_DIAL_UNATTENDED, ref temp, 0);
return retVal;
}
public void Disconnect()
{
RAS.RasHangUp(m_ConnectedRasHandle);
}
}
}

下面是引用这个代码的实例，加入一个comboBox来显示拨号的设置，用两个button来控制连接状态，用八个label来显示连接后的状态信息，希望对大家有用处。原Web程序参见CodeProject中的文章

//////////////////////////////////////////////////////////////////////

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Dialup.RAS;

namespace Dialup
{
public partial class frmMain : Form
{
public frmMain()
{
InitializeComponent();

BindData();
}

private void BindData()
{
try
{
RASDisplay display = new RASDisplay();

lblName.Text = display.ConnectionName;
lblDuration.Text = display.Duration;
lblReceived.Text = display.BytesReceived.ToString();
lblTransmitted.Text = display.BytesTransmitted.ToString();

if (!display.IsConnected)
{
tblCurrentConnection.Visible = false;
cboAllConnections.Visible = true;
timer1.Stop();
}
else
{
tblCurrentConnection.Visible = true;
cboAllConnections.Visible = false;
timer1.Start();
}

cboAllConnections.DataSource = display.Connections;
}
catch (Exception e)
{
MessageBox.Show(e.Message);
}
}

protected void btnConnect_Click(object sender, EventArgs e)
{
RASDisplay rasDisplay = new RASDisplay();

int ErrorVal = rasDisplay.Connect(cboAllConnections.Text);

if (ErrorVal != 0)
MessageBox.Show(ErrorVal.ToString());
else
timer1.Start();
}
protected void btnDisConnect_Click(object sender, EventArgs e)
{
RASDisplay rasDisplay = new RASDisplay();
rasDisplay.Disconnect();
BindData();
}

private void timer1_Tick(object sender, EventArgs e)
{
BindData();
}
}
}