如何确定当前正在使用的网络连接的名称

[韧恒]

一台机器有两个网卡，在win2000/xp中会有两个本地连接(本地连接1和本地连接2)，如何确定正在使用哪个连接？也就是获得正在使用的连接名称。

[samwzhang]

RAS机制。

[samwzhang]

还有IP Helper API机制，一起用。

[samwzhang]

哦，可能你要的是这个：网络端口监听：
Option Explicit
Private Type MIB_TCPROW ' TCP连接表中一行的结构
dwState As Long ' 状态
dwLocalAddr As Long ' Local IP
dwLocalPort As Long ' Local port
dwRemoteAddr As Long ' Remote IP
dwRemotePort As Long ' Remote port
End Type

Private Type MIB_TCPTABLE
dwNum_Of_Entries As Long ' 当前 TCP连接的总数
TCP_Table(120) As MIB_TCPROW ' 预留了120行的缓冲区
End Type

Private Declare Function GetTcpTable Lib "iphlpapi.dll" (ByRef pTcpTable _
As MIB_TCPTABLE, ByRef pdwSize As Long, ByVal bOrder As Long) As Long
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (ByRef _
pDest As Any, ByRef pSource As Any, ByVal Length As Long)
Dim TCP1 As MIB_TCPTABLE
Dim Last_Num_Of_Entries As Long
Private Sub Command1_Click()
Dim Return1 As Long, i As Long, Tmp1 As Long, Tmp2 As Long
Dim Ip_Buf(1 To 4) As Byte
Dim Win_Path As String, Tmp3 As String
Return1 = GetTcpTable(TCP1, Len(TCP1), 1) ' 返回 TCP连接表
If Last_Num_Of_Entries <> 0 And _
Last_Num_Of_Entries <> TCP1.dwNum_Of_Entries Then ' 有异常时发出警告
Picture1.Visible = True ' 设置警告标志
On Error GoTo 0
Else
If Picture1.Visible = True Then Picture1.Visible = False
End If
Last_Num_Of_Entries = TCP1.dwNum_Of_Entries
Select Case Return1 ' 判断返回值
Case 0&:
Text1 = "": Combo1.Clear
For i = 0 To TCP1.dwNum_Of_Entries - 1
If TCP1.TCP_Table(i).dwLocalAddr <> 0 Then
If i > 1 Then
If TCP1.TCP_Table(i).dwLocalAddr = TCP1.TCP_Table(i - 1).dwLocalAddr Then GoTo MyNext
End If
Tmp3 = Str(i + 1) + " "
Select Case TCP1.TCP_Table(i).dwState ' 显示连接状态
Case 1: Tmp3 = Tmp3 + "CLOSED"
Case 2: Tmp3 = Tmp3 + "LISTENING"
Case 3: Tmp3 = Tmp3 + "SYN_SENT"
Case 4: Tmp3 = Tmp3 + "SYN_RCVD"
Case 5: Tmp3 = Tmp3 + "ESTABLISHED"
Case 6: Tmp3 = Tmp3 + "FIN_WAIT1"
Case 7: Tmp3 = Tmp3 + "FIN_WAIT2"
Case 8: Tmp3 = Tmp3 + "CLOSE_WAIT"
Case 9: Tmp3 = Tmp3 + "CLOSING"
Case 10: Tmp3 = Tmp3 + "LAST_ACK"
Case 11: Tmp3 = Tmp3 + "TIME_WAIT"
Case 12: Tmp3 = Tmp3 + "DELETE_TCB"
End Select
Combo1.AddItem Tmp3 ' 充实列表以供用户删除
Tmp3 = Tmp3 + ":" + vbCrLf + vbTab + "Local: " ' 本地IP
CopyMemory Ip_Buf(1), TCP1.TCP_Table(i).dwLocalAddr, 4
Tmp3 = Tmp3 + CStr(Ip_Buf(1)) + "." + CStr(Ip_Buf(2)) + "." _
+ CStr(Ip_Buf(3)) + "." + CStr(Ip_Buf(4))
Tmp1 = TCP1.TCP_Table(i).dwLocalPort ' 本地端口
Tmp2 = Tmp1 / 256 + (Tmp1 Mod 256) * 256
Tmp3 = Tmp3 + ":" + Str(Tmp2) + vbTab + "Remote: " ' 远程IP
CopyMemory Ip_Buf(1), TCP1.TCP_Table(i).dwRemoteAddr, 4
Tmp3 = Tmp3 + CStr(Ip_Buf(1)) + "." + CStr(Ip_Buf(2)) + "." _
+ CStr(Ip_Buf(3)) + "." + CStr(Ip_Buf(4))
Tmp1 = TCP1.TCP_Table(i).dwRemotePort ' 远程端口
Tmp2 = Tmp1 / 256 + (Tmp1 Mod 256) * 256
Tmp3 = Tmp3 + ":" + Str(Tmp2) + vbCrLf
Text1 = Text1 + Tmp3 + Chr(10) + Chr(13)
End If
MyNext:
Next i
Case 50&:
MsgBox "系统不支持该API函数": End
Case 87:
MsgBox "无效的参数": End
Case 111&:
MsgBox "缓冲区溢出": End
Case 232&:
MsgBox "无数据": End
End Select
End Sub

总算回报你一把。

[pikachu8guan]

顶下 学到东西喽 耶

[samwzhang]

IP Helper 监听获得正在通讯的IP
再用IP Helper 机制获得对应网卡或连接名称
远程连接可以用Ras机制获得连接名。

[韧恒]

To: " samwzhang(分全给我) " 很感谢你，不过这不是我想要的。