Getting the LAN Connection Speed 10 mbits  100 mbits, Half Duplex / Full duplex

Posted on 2004-10-19
Medium Priority
Last Modified: 2010-05-18
Does any one know how to get the Local area network connection speed?

I need to know if it is 10, 100 or 1000
and if it is Half duplex or Full duplex

Using Delphi 7, Windows 2000 pro

Cheers Darren
Question by:dhnkley
  • 2
LVL 17

Expert Comment

by:Wim ten Brink
ID: 12355969
Interesting... I expected this information to be available through WMI but it isn't. Besides, you might be in trouble since there are some different network speeds available too. I once had an USB connection between two PC's and this was listed as only 5 mbit. My wireless network card claims it's 45 mbit most of the time. Still, I think you can get the performance data through WMI which should give you the bandwidth value and lots of other information.
LVL 17

Accepted Solution

Wim ten Brink earned 2000 total points
ID: 12368063
I've done some search in WMI. You could use a 'select CurrentBandwidth, Name from Win32_PerfRawData_Tcpip_NetworkInterface' query in WMI to get the bandwidth per network controller. However, determining duplex mode is something I haven't found within WMI.

This code gets the bandwidth for all network cards:

  Windows, SysUtils, Classes, ActiveX, ComObj, WbemScripting_TLB;

  sQuery = 'select CurrentBandwidth, Name from Win32_PerfRawData_Tcpip_NetworkInterface';
  Enum: IEnumVariant;
  Item: SWbemObject;
  Enum := CoSWbemLocator.Create.ConnectServer( '', 'root\cimv2', '', '', '', '', 0, nil ).ExecQuery( sQuery, 'WQL', wbemFlagBidirectional, nil )._NewEnum as IEnumVariant;
  while NextItem( Enum, SWBemObject, Item ) do begin
    WriteLn( 'Network ', VarToStr( Item.Properties_.Item( 'Name', 0 ) ), ', bandwidth ', VarToStr( Item.Properties_.Item( 'CurrentBandwidth', 0 ) ) );

WbemScripting_TLB is created by converting the C:\WINNT\system32\wbem\wbemdisp.tlb type library to Delphi. But for Delphi 7 I've already created a version at http://www.workshop-alex.org/Sources/WbemScripting_TLB.pas that can be used.
Now, all you need is the Duplex info. :-)

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