form1.frm

本书源码主要针对目前流行的FTP、HTTP、E-mail、Telnet、ICMP、Modem串口通信编程、拨号网络编程等内容进行详细的讲解

VERSION 5.00
Object = "{248DD890-BB45-11CF-9ABC-0080C7E7B78D}#1.0#0"; "MSWINSCK.OCX"
Begin VB.Form Form1 
   Caption         =   "端口扫描程序"
   ClientHeight    =   3435
   ClientLeft      =   165
   ClientTop       =   555
   ClientWidth     =   4440
   Icon            =   "Form1.frx":0000
   LinkTopic       =   "Form1"
   ScaleHeight     =   3435
   ScaleWidth      =   4440
   StartUpPosition =   3  'Windows Default
   Begin VB.CommandButton Command3 
      Caption         =   "扫描可能端口"
      Height          =   375
      Left            =   2880
      TabIndex        =   9
      Top             =   840
      Width           =   1335
   End
   Begin VB.TextBox logport 
      BackColor       =   &H00FFFFFF&
      ForeColor       =   &H000000C0&
      Height          =   1935
      Left            =   120
      Locked          =   -1  'True
      MultiLine       =   -1  'True
      ScrollBars      =   2  'Vertical
      TabIndex        =   5
      Text            =   "Form1.frx":000C
      Top             =   720
      Width           =   2655
   End
   Begin VB.TextBox Text3 
      BackColor       =   &H00FFFFFF&
      ForeColor       =   &H000000C0&
      Height          =   285
      Left            =   1440
      TabIndex        =   4
      Top             =   3000
      Width           =   1215
   End
   Begin VB.CommandButton Command2 
      Caption         =   "停止扫描"
      Enabled         =   0   'False
      Height          =   375
      Left            =   2880
      TabIndex        =   3
      Top             =   2160
      Width           =   1335
   End
   Begin MSWinsockLib.Winsock Winsock1 
      Left            =   3840
      Top             =   3000
      _ExtentX        =   741
      _ExtentY        =   741
      _Version        =   393216
   End
   Begin VB.TextBox Text2 
      BackColor       =   &H00000000&
      ForeColor       =   &H0080FFFF&
      Height          =   285
      Left            =   3240
      TabIndex        =   2
      Text            =   "65530"
      Top             =   360
      Width           =   855
   End
   Begin VB.TextBox Text1 
      BackColor       =   &H00000000&
      ForeColor       =   &H0080FFFF&
      Height          =   285
      Left            =   1680
      TabIndex        =   1
      Text            =   "1"
      Top             =   360
      Width           =   855
   End
   Begin VB.CommandButton Command1 
      Caption         =   "开始扫描"
      Height          =   375
      Left            =   2880
      TabIndex        =   0
      Top             =   1560
      Width           =   1335
   End
   Begin VB.Label Label3 
      BackStyle       =   0  'Transparent
      Caption         =   "正在扫描端口"
      BeginProperty Font 
         Name            =   "MS Sans Serif"
         Size            =   9.75
         Charset         =   0
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H000000C0&
      Height          =   255
      Left            =   120
      TabIndex        =   8
      Top             =   3000
      Width           =   1695
   End
   Begin VB.Label Label2 
      BackStyle       =   0  'Transparent
      Caption         =   "---------"
      BeginProperty Font 
         Name            =   "MS Sans Serif"
         Size            =   12
         Charset         =   0
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H000000C0&
      Height          =   255
      Left            =   2640
      TabIndex        =   7
      Top             =   360
      Width           =   495
   End
   Begin VB.Label Label1 
      BackStyle       =   0  'Transparent
      Caption         =   "端口扫描范围："
      BeginProperty Font 
         Name            =   "MS Sans Serif"
         Size            =   9.75
         Charset         =   0
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H000000C0&
      Height          =   255
      Left            =   240
      TabIndex        =   6
      Top             =   360
      Width           =   1455
   End
   Begin VB.Image Image1 
      Height          =   1785
      Index           =   0
      Left            =   0
      Top             =   0
      Width           =   4425
   End
   Begin VB.Image Image1 
      Height          =   1785
      Index           =   1
      Left            =   0
      Top             =   1680
      Width           =   4425
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Dim portnum As Long
Dim start As String
Dim TimerOnOff As String


Private Sub Command1_Click()
Command2.Enabled = True
If Text1.Text = "" Then
MsgBox "输入开始扫描端口"
Exit Sub
End If
If Text2.Text = "" Then
MsgBox "输入最大扫描端口"
Exit Sub
End If

Text1.Locked = True
Text2.Locked = True
Command1.Enabled = False
Winsock1.Close
start = True
logport.Text = " 开始扫描"

Call scanningports
logport.Text = logport.Text & vbCrLf & "端口 " & Text1.Text & "- " & Text3.Text & "  被成功扫描."
End Sub

Sub scanningports()
Dim porttwo As Long
portnum = Text1.Text
porttwo = Text2.Text
Command2.Enabled = True
On Error GoTo viriio
Do
    portnum = portnum + 1
    DoEvents
    If start = True Then
        Winsock1.Close '关闭当前连接
        DoEvents '使程序稳定性加强的手段，可以响应其他事件
        Winsock1.LocalPort = portnum
        DoEvents
        Text3.Text = portnum
        Winsock1.Listen '开始侦听
        DoEvents
    Else '单击停止按钮
        portnum = 0
        Command1.Enabled = True
        Text1.Locked = False
        Text2.Locked = False
        Exit Sub
    End If
    Winsock1.Close
    DoEvents
Loop Until portnum >= porttwo
    portnum = 0
    Command1.Enabled = True
    logport.Text = logport.Text & vbCrLf & "完成端口扫描!" & vbCrLf
    Text1.Locked = False
    Text2.Locked = False
viriio:

    If Err.Number = 10048 Then
        logport.Text = logport.Text & vbCrLf & "端口 " & Winsock1.LocalPort & " 已经被使用!"
        Resume Next ' 回到出错误的地方
    End If

End Sub

Private Sub Command2_Click()
Command2.Enabled = False
start = False
End Sub

Private Sub Command3_Click()
Text1.Text = "1"
Text2.Text = "65530"

Text1.Locked = True
Text2.Locked = True
Command1.Enabled = False
Winsock1.Close
start = True

Call scanningports
End Sub