MODEM的AT命令CID和VCID是设置是不是来电显示的，如果电信开通了来电显示功能

就能通过MODEM来显示对方的电话号码。那么首先设置CID=1或是VCID=1

般来说来电显示的信息为：

DATE = MMDD "来电日期 MMDD

TIME = HHMM "来电时间 HHMM

NMBR = ######## "来电号码

程序实现如下,设置MSComm1的相关设置，并建两个Label为Label1和Label2

Function OpenCID(OpenCLose As Boolean) As Boolean

'打开或是关毕来电显示功能

On Error Resume Next

Dim ArrCID(1) As String

ArrCID(0) = "at#cid=" & IIf(openclode,1,0)

ArrCID(1) = "at#vcid=" & IIf(openclode,0)

MSComm1.RThreshold = 0

For i = 0 To 1

MSComm1.Output = ArrCID(i) & vbCr

EndTime = Timer + 0.5

Do While bStop = False

nTemp = nTemp + 1

If MSComm1.InBufferCount >= 2 Then

sTemp = MSComm1.Input

If InStr(sTemp,"OK") = 0 Then

bStop = True

OpenCID = True

Exit Function

End If

End If

If Timer >= EndTime Or ErrorCode Then Exit Do

Loop

Next i

OpenCID = False

MSComm1.RThreshold = 1

End Function

下面的函数显示来电号码并在窗体上的Label1的Label2上显示出来

Private Sub MSComm1_OnComm()

On Error Resume Next

Static Buffer As String

' 收到多于 RThreshold 属性设置的字符数（RThreshold 属性必须大于 0）。

'label1 = "收到" + Str(MSComm1.InBufferCount) + "个字符"

Buffer = Buffer + MSComm1.Input

Buffer = UCase(Buffer)

' Exit Sub

If InStr(1,Buffer,"RING",vbTextCompare) Then

'收到震铃

'Comm1.Output = "ATA" + Chr(13) '命令 Modem 摘机响应

Buffer = "" '清缓冲区字符

'mciExecute "sound " & SystemPath & "/ringin.wav"

Label1 = "状态：收到震铃"

Zhen = True

frmCallID.Show

frmCallID.ChangRing

ElseIf InStr(1,"CONNECT",vbTextCompare) Then

'对方应答呼叫

Buffer = "" '清缓冲区字符

Label1 = "状态：已经建立连接"

ElseIf InStr(1,"BUSY",vbTextCompare) Then

'对方线路忙

Buffer = "" '清缓冲区字符

Label1 = "状态：对方线路忙"

ElseIf InStr(1,"No DIA",vbTextCompare) Then

Buffer = "" '清缓冲区字符

Label1 = "状态：拨出号码错,请检查电话线"

Command1_Click

ElseIf InStr(1,"No CARRIER",vbTextCompare) Then

'对方未摘机或未响应

Buffer = "" '清缓冲区字符

Label1 = "状态：对方未摘机"

ElseIf InStr(1,"NMBR =",vbTextCompare) Then

tmpStr = InStr(1,"NMBR",vbTextCompare)

CallNum = Right(Buffer,Len(Buffer) - lll - 6)

Label2.Caption = "对方电话：" + CallNum

'Buffer = "" '清缓冲区字符

ElseIf InStr(1,"OK",vbTextCompare) And Asc(Right(Buffer,1)) = 10 Then

If Zhen = False Then Buffer = "" '清缓冲区字符

If Command1.Caption = "挂断" Then

Label2.Caption = "状态：已经播通电话：" + txtCallNum

End If

End If

End Sub