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6.2

problem of using API function: CreateFile

Asked by luxu in Visual Basic Programming

Tags: comavailable, createfile

Hi,
I copied the below function on this web site to use CreateFile to detect the COM port. The function works
fine for window 2000 and a little fine for Window XP (because it detects the total COM ports including real (which has DB9 interface) and physical(which doesn't have DB9 interface) COM Port for Window XP) but don't work for window 98? How to make it work for Window 98?
Thanks very much.

luxu

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, GENERIC_READ Or GENERIC_WRITE, 0, sec, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0)
hCOM = CreateFile("//./COM" & COMNum, GENERIC_READ Or GENERIC_WRITE, 0,sec, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0)
If hCOM = -1 Then ' INVALID_HANDLE_VALUE
COMAvailable = False
Else
COMAvailable = True
End If
'close the COM port
ret = CloseHandle(hCOM)

End Function

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	Title
1	Api Spying
2	Management.ManagementObjectSear…
3	Locking Files..
4	COM Port problem
5	Console output
6	Object reference not set

problem of using API function: CreateFile

Asked by luxu in Visual Basic Programming

Tags: comavailable, createfile

About this solution