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JonBMN

Looping through Com Ports

3 posts in this topic

So, I'm looking at ways to loop through the com ports. My question is, what would be the recommended way to loop through the com ports? Through the registry, and is there a certain loop for this? Through the WMI? Any help is greatly appreciated.

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I would start with WMI, personally. WIN32_SerialPort should allow you to enumerate them (doesn't catch virtual ports IIRC). Something like this:

$wbemFlagReturnImmediately = 0x10
$wbemFlagForwardOnly = 0x20


$WMI = ObjGet("winmgmts:\\" & @ComputerName & "\root\CIMV2")
$aPorts = $WMI.ExecQuery("SELECT * FROM Win32_SerialPort", "WQL", $wbemFlagReturnImmediately + $wbemFlagForwardOnly)

If IsObj($aPorts) then
   For $Port In $aPorts
       MsgBox(0, $Port.Caption, $Port.Name)
   Next
Else
   Msgbox(0,"WMI Output","No WMI Objects Found for class: " & "Win32_SerialPort" )
Endif

√-1 2^3 ∑ π, and it was delicious!

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#3 ·  Posted (edited)

Thank you for the suggestion and the example script. WMI seems to be the best bet for this. Now, what I'm trying to do with this is loop through the ports, find a specific VID & PID, but I have hit a snag. If i have two cables plugged into the computer using the same VID & PID, this creates a problem. So, I wanted to know if going through the com ports and sending a command of ATI and then parsing the results would be a good idea?

The loop I have checking this would need to run almost constantly. Would this create problems running all the time? Would this even be a good solution for a computer that would have 10-15 ports initialized? It seems like that would create problems with the volume it is looping through. Can some light be shed on this?

Edited by JonBMN

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