I want to know which com port my modem is using??

[Mih_Flyer]

hi,
I want to know which com port my modem using, ofcourse i want to knpw that using VB code,Please Help

[Bart]

Maybe this helps a little?

'// API Declarations
Public Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" (ByVal lpFileName As String, ByVal dwDesiredAccess As Long, ByVal dwShareMode As Long, lpSecurityAttributes As SECURITY_ATTRIBUTES, ByVal dwCreationDisposition As Long, ByVal dwFlagsAndAttributes As Long, ByVal hTemplateFile As Long) As Long
Public Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long

'// API Structures
Public Type SECURITY_ATTRIBUTES
nLength As Long
lpSecurityDescriptor As Long
bInheritHandle As Long
End Type

'// API constants
Public Const FILE_SHARE_READ = &H1
Public Const FILE_SHARE_WRITE = &H2
Public Const OPEN_EXISTING = 3
Public Const FILE_ATTRIBUTE_NORMAL = &H80


'// Return TRUE if the COM exists, FALSE if the COM does not exist
Public Function COMAvailable(COMNum As Integer) As Boolean
Dim hCOM As Long
Dim ret As Long
Dim sec As SECURITY_ATTRIBUTES

'// try to open the COM port
hCOM = CreateFile("COM" & COMNum & "", 0, FILE_SHARE_READ + _
FILE_SHARE_WRITE, sec, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0)
If hCOM = -1 Then
COMAvailable = False
Else
COMAvailable = True
'// close the COM port
ret = CloseHandle(hCOM)
End If
End Function

Then, use the code below to go through all the possible COM ports, and find if they are available or not. This code presumes that you have a Combo box named cboComm.

Private Sub ListComPorts()
Dim i As Integer

cboComm.Clear
For i = 1 To 16
If COMAvailable(i) Then
cboComm.AddItem i
End If
Next
cboComm.ListIndex = 0
End Sub

[Mih_Flyer]

Thanx man, but when i tried it, nothing happened, i mean it said that no com port in my system is active, the combobox shows nothing at all, What do ya think??

[Bart]

I'm sorry man, I haven't tried it yet. I got it from
http://www.vbweb.co.uk

[Mih_Flyer]

Thanx alot any way