VERSION 5.00
Begin VB.Form Form1 
   BorderStyle     =   3  'Fixed Dialog
   Caption         =   "電話撥號上網"
   ClientHeight    =   1830
   ClientLeft      =   3765
   ClientTop       =   3720
   ClientWidth     =   3510
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   PaletteMode     =   1  'UseZOrder
   ScaleHeight     =   1830
   ScaleWidth      =   3510
   ShowInTaskbar   =   0   'False
   Begin VB.CommandButton cmdExit 
      Caption         =   "退出(&x)"
      Height          =   375
      Left            =   1920
      TabIndex        =   3
      Top             =   1200
      Width           =   1215
   End
   Begin VB.CommandButton cmdDial 
      Caption         =   "撥號(&D)..."
      Height          =   375
      Left            =   360
      TabIndex        =   2
      Top             =   1200
      Width           =   1215
   End
   Begin VB.TextBox txtNumber 
      Height          =   285
      Left            =   120
      TabIndex        =   0
      Top             =   600
      Width           =   3255
   End
   Begin VB.Label Label1 
      Caption         =   "電話號碼:"
      Height          =   255
      Left            =   120
      TabIndex        =   1
      Top             =   360
      Width           =   1935
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit

Private Declare Function tapiRequestMakeCall& Lib "TAPI32.DLL" (ByVal DestAddress$, ByVal AppName$, ByVal CalledParty$, ByVal Comment$)
Private Const TAPIERR_NOREQUESTRECIPIENT = -2&
Private Const TAPIERR_REQUESTQUEUEFULL = -3&
Private Const TAPIERR_INVALDESTADDRESS = -4&


Private Sub cmdDial_Click()
    Dim buff As String
    Dim nResult As Long

    nResult = tapiRequestMakeCall&(Trim$(txtNumber), CStr(Caption), "Test Dial", "")
    If nResult <> 0 Then
         buff = "撥號錯誤 : "
' 顯示出錯信息
        Select Case nResult
            Case TAPIERR_NOREQUESTRECIPIENT
                buff = buff & "沒有Windows撥號程序運行或無法打開撥號程序."
            Case TAPIERR_REQUESTQUEUEFULL
                buff = buff & "未完成的Windows撥號程序隊列已滿."
            Case TAPIERR_INVALDESTADDRESS
                buff = buff & "無效電話號碼."
            Case Else
                buff = buff & "未知錯誤."

        End Select
        MsgBox buff
    End If
End Sub

Private Sub cmdExit_Click()
    Unload Me
End Sub

Private Sub Form_Load()
    Move (Screen.Width - Width) \ 2, (Screen.Height - Height) \ 2
    EnableDial
End Sub

Private Sub txtNumber_Change()
    EnableDial
End Sub

Private Sub EnableDial()
    cmdDial.Enabled = Len(Trim$(txtNumber)) > 0
End Sub