Library code snippets
Dialer
This example allows you to use the MS Comm control to dial a telephone number.
First, add the MSComm control to your form (you will need to add it to your toolbox by going to Project|Components). Next, add a label called lblMsg, and two command buttons called cmdDial and cmdCancel. Finally, add the code below. Note that you will need to change the Com port property (that is set in the Dial sub) to the COM port your modem uses. This is usually 1-4.
Option Explicit
' This flag is set when the user chooses Cancel.
Dim CancelFlag
Private Sub cmdCancel_Click()
' CancelFlag tells the Dial procedure to exit.
CancelFlag = True
cmdCancel.Enabled = False
End Sub
Private Sub Dial(Number As String)
Dim DialString As String, FromModem As String, dummy As
String
' AT is the Hayes compatible ATTENTION command and is
required to send commands to the modem.
' DT means "Dial Tone." The Dial command uses touch
tones, as opposed to pulse (DP = Dial Pulse).
' Numbers is the phone number being dialed.
' A semicolon tells the modem to return to command mode after
dialing (important).
' A carriage return, vbCr, is required when sending commands
to the modem.
DialString = "ATDT" + Number + ";" + vbCr
' Communications port settings.
' Assuming that a mouse is attached to COM1, CommPort is set
to 2
MSComm1.CommPort = 3
MSComm1.Settings = "9600,N,8,1"
' Open the communications port.
On Error Resume Next
MSComm1.PortOpen = True
If Err Then
MsgBox "COM" &
MSComm1.CommPort & ": not available. Change the CommPort property to
another port."
Exit Sub
End If
' Flush the input buffer.
MSComm1.InBufferCount = 0
' Dial the number.
MSComm1.Output = DialString
' Wait for "OK" to come back from the modem.
Do
dummy = DoEvents()
' If there is data in the buffer, then read
it.
If MSComm1.InBufferCount Then
FromModem = FromModem +
MSComm1.Input
' Check for
"OK".
If InStr(FromModem,
"OK") Then
'
Notify the user to pick up the phone.
Beep
MsgBox
"Please pick up the phone and either press Enter or click OK"
Exit Do
End If
End If
' Did the user choose Cancel?
If CancelFlag Then
CancelFlag = False
Exit Do
End If
Loop
' Disconnect the modem.
MSComm1.Output = "ATH" + vbCr
' Close the port.
MSComm1.PortOpen = False
End Sub
Private Sub cmdDial_Click()
Dim Number As String, Temp As String
cmdDial.Enabled = False
cmdCancel.Enabled = True
' Get the number to dial.
Number = InputBox("Enter phone number:", Number)
If Number = "" Then Exit
Sub
Temp = lblMsg
lblMsg = "Dialing - " + Number
' Dial the selected phone number.
Dial Number
cmdDial.Enabled = True
cmdCancel.Enabled = False
lblMsg = Temp
End Sub
Private Sub Form_Load()
' Setting InputLen to 0 tells MSComm to read the entire
' contents of the input buffer when the Input property
' is used.
MSComm1.InputLen = 0
End Sub
James first started this website when learning Visual Basic back in 1999 whilst studying his GCSEs. The site grew steadily over the years while being run as a hobby - to a regular monthly audience ...
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First off I am new to VB. I am getting 5 errors with this code.
1. At "If Err() Then" - This gives an error message - Value of Type Microsoft.VisualBasic.ErrObject cann't be converted to 'Boolean'
2. At "dummy = DoEvents()" - Error message - Name 'DoEvents' is not declared
3. At "Temp = lblMsg" - Error message- Value of type 'System.Windows.Forms.Label' cannot be converted to 'String'
4. At "lblMsg = "Dialing - " + Number" - Error message- Value of type 'String' cannot be converted to 'System.Windows.Forms.Label'
5. At "lblMsg = Temp" - Error message - Value of type 'String' cannot be converted 'System.Windows.Forms.Label'
I am using VB 2005 Express Edition and Windows XP. I would appreciate any help especially since I am very new to VB. Thank you
and how do i get to verify my username and password this way??it does't do that with the code snippet given here..
hi again..
another alternative.how can i invoke an already existing dial up on my VB application? i just wanna place an icon on my app so that on clicking it,it'l connect to the network...i'm working on windows.
help!!!!
hi!
i'm working with VB 6.0 and i'm trying to invoke a dial up in my application..i used the code snippet given here,but it does't seem to be working..the modem does't connect.wut am i doing wrong?
I am having the same problem with releasing the comm port. So, whilest debugging it will work the first time (even get OK response from modem) and then nothing on subsequent attempts.
Trying all of this in vs 2003.
Thanks
roywyma@sbcglobal.net
Hi,
I am trying to get the dialer program to work. I have followed all of the instructions, but get these error messages:
(92): 'Option' statements must precede any declarations or 'Imports' statements.
(121): Value of type 'Microsoft.VisualBasic.ErrObject' cannot be converted to 'Boolean'.
(122): Method arguments must be enclosed in parentheses.
(134): Name 'DoEvents' is not declared.
(142): Method arguments must be enclosed in parentheses.
(170): Value of type 'System.Windows.Forms.Label' cannot be converted to 'String'.
(171): Value of type 'String' cannot be converted to 'System.Windows.Forms.Label'.
(174): Method arguments must be enclosed in parentheses.
(179): Value of type 'String' cannot be converted to 'System.Windows.Forms.Label'.
My code is available at this link:
http://cybereshop.lmhost2.com/dialer.vb
Please reply with how I can fix this or updated code. Thank you.
Respected Sir
I have Tata Indicom Phone, that I am using for Internet Surfing.When I saw this code. I tried in vb6.0 Using the same phone. But I am getting messege like
com1 : not available. Change the CommPort property to another port."
I changed commport value to 2
alse to 3 and 4 . Still then I am getting this messege. Please help me...............
i'm using VS.net 2003 to develop the web mobile application, one of the functionalities is dialing phone number but i couldn't find MSComm control component you mentioned in VS.net 2003.Is there other ways to write this functionality beside using MSComm control?Please help...my assignment gonna due soon
I used this code but when i disconnect the call the modem
can't accept a new call.You can't connect as if the modem isn't
fully released.
Do i need to add something?
Thanks.
this my sample com server , t think it's because loop-doevent
Dim MSComm1 As Object
Private betulker As Boolean
Private FromModem As String
Private outputString As String
Public Function output() As String
output = outputString
End Function
Public Sub setRTUstr(inputString As String)
outputString = inputString
End Sub
Public Function getRTUstr() As String
getRTUstr = outputString
End Function
Public Sub Dial(number As String, portmane As Integer, bauds As String)
On Error Resume Next
Dim DialString As String, dummy As String
DialString = "ATDT" & "0" & number & Chr$(13)
MSComm1.CommPort = CInt(portmane)
MSComm1.Settings = CStr(baunds) + ",N,8,1"
On Error Resume Next
MSComm1.PortOpen = True
If Err Then
If MSComm1.InBufferCount Then
FromModem = FromModem + MSComm1.Input
MsgBox FromModem
'Text1.Text = FromModem
If InStr(FromModem, "BUSY") Then
MsgBox "Line tengah Busy"
Else
If InStr(FromModem, "R") Then
betulker = True
Else
betulker = False
End If
End If
End If
Loop
End Sub
Public Sub rtu()
On Error GoTo ErrHandler
Dim sLastString As String
Dim sOutput As String
Dim sBuffer As String
With MSComm1
.output = "*1R" & Chr$(13) & Chr$(13)
End With
Exit Sub
ErrHandler:
MsgBox "ada error..la kat sini,Sila semak dulu", vbCritical
End Sub
Public Sub semak()
If betulker = True Then
setRTUstr Right(FromModem, 10)
Else
MsgBox "belum lagi nie..Tunggu sikit Lagi", vbCritical, "amaran"
End If
End Sub
Private Sub Class_Initialize()
Set MSComm1 = CreateObject("MSCommLib.MSComm")
MSComm1.InBufferSize = 1
MSComm1.RThreshold = 1
MSComm1.InputLen = 0
MSComm1.OutBufferSize = 512
MSComm1.SThreshold = 1
MSComm1.NullDiscard = True
MSComm1.RTSEnable = True
MSComm1.DTREnable = True
End Sub
Private Sub Class_Terminate()
MSComm1.PortOpen = False
End Sub
what dont you understand? Do you know VB at all?
P.S. I havent looked at this example so you'll need to be a little more specific
i need the whole source, meaing the .vbp .frm all the files for this program. I don't quite understand this......
Thanks...
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