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    <pre><code>Option Explicit '****************************************************************************** ' Description: Scans machine using the WIN32 API for all available comm hardware ' Usage: main program calls the 'CommSettings' sub, passing the ' name of the communications control and a combobox name. '****************************************************************************** Dim CommCntrl As Control ' the communications control Dim cmboPort As Control ' combobox to populate Dim bNoComm As Boolean Private Const MAX_COMM = 16 ' 32 max port # to check Private Const GENERIC_READ = &amp;H80000000 Private Const GENERIC_WRITE = &amp;H40000000 Private Const OPEN_EXISTING = 3 Private Const FILE_FLAG_OVERLAPPED = &amp;H40000000 Private Const INVALID_HANDLE_VALUE = -1 Private Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" _ (ByVal lpFileName As String, _ ByVal dwDesiredAccess As Long, _ ByVal dwShareMode As Long, _ ByVal lpSecurityAttributes As String, _ ByVal dwCreationDisposition As Long, _ ByVal dwFlagsAndAttributes As Long, _ ByVal hTemplateFile As String) As Long Private Declare Function CloseHandle Lib "kernel32" ( _ ByVal hObject As Long) As Long Public Sub GetPorts(serialCntrl As Control, comboBox As Control) '****************************************************************************** ' Usage: Pass the name of the communications control, a combo box, and the ' current com port setting in the calling routine. '****************************************************************************** Dim iCntr As Integer ' loop counter Dim hRet As Long ' api return value Dim sCom As String ' comm port name On Error Resume Next Set cmboPort = comboBox Set CommCntrl = serialCntrl Err = 0 cmboPort.Clear ' Close the port if it's open If CommCntrl.PortOpen = True Then CommCntrl.PortOpen = False DoEvents Else bNoComm = True End If ' Scan for all possible hardware so we can display all available ports ' in the combo box. Dynamically adjusts for PC's with addin cards For iCntr = 1 To MAX_COMM ' try to open the port. ' \\.\ required for ports &gt; 9, works for all ports sCom = "\\.\Com" &amp; CStr(iCntr) &amp; vbNullChar hRet = CreateFile(sCom, GENERIC_READ Or _ GENERIC_WRITE, 0, vbNullString, OPEN_EXISTING, _ FILE_FLAG_OVERLAPPED, vbNullString) If hRet &lt;&gt; INVALID_HANDLE_VALUE Then hRet = CloseHandle(hRet) cmboPort.AddItem Format$(iCntr) Debug.Print iCntr Else ' dll error 5 = already open ' dll error 2 = no harware If Err.LastDllError = 5 Then cmboPort.AddItem Format$(iCntr) &amp; " - Busy" End If End If Next End Sub </code></pre>
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