How to enumerate all installed usb modem using Windows API

Question

I have bought a ZTE MF190 usb modem and began to harness it.

So far, I have managed to programmatically have an sms sent to another mobile equipement using free AsyncPro components of TurboPowers.

I wonder wether there is a way to retrieve the list of all installed modems along with their attached serial COM ports (hopefully with other valuable capabilities).

Thanks in advance.

Answer 1

To list the installed modems you can use the Win32_POTSModem WMI class

Check this sample code.

{$APPTYPE CONSOLE}

uses
  SysUtils,
  ActiveX,
  ComObj,
  Variants;


procedure  GetWin32_POTSModemInfo;
const
  WbemUser            ='';
  WbemPassword        ='';
  WbemComputer        ='localhost';
  wbemFlagForwardOnly = $00000020;
var
  FSWbemLocator : OLEVariant;
  FWMIService   : OLEVariant;
  FWbemObjectSet: OLEVariant;
  FWbemObject   : OLEVariant;
  oEnum         : IEnumvariant;
  iValue        : LongWord;
begin;
  FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
  FWMIService   := FSWbemLocator.ConnectServer(WbemComputer, 'root\CIMV2', WbemUser, WbemPassword);
  FWbemObjectSet:= FWMIService.ExecQuery('SELECT * FROM Win32_POTSModem','WQL',wbemFlagForwardOnly);
  oEnum         := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
  while oEnum.Next(1, FWbemObject, iValue) = 0 do
  begin
    Writeln(Format('AttachedTo      %s',[String(FWbemObject.AttachedTo)]));// String
    Writeln(Format('DeviceID        %s',[String(FWbemObject.DeviceID)]));// String
    Writeln(Format('Model           %s',[String(FWbemObject.Model)]));// String
    Writeln(Format('Name            %s',[String(FWbemObject.Name)]));// String
    Writeln(Format('PortSubClass    %s',[String(FWbemObject.PortSubClass)]));// String
    FWbemObject:=Unassigned;
  end;
end;


begin
 try
    CoInitialize(nil);
    try
      GetWin32_POTSModemInfo;
    finally
      CoUninitialize;
    end;
 except
    on E:EOleException do
        Writeln(Format('EOleException %s %x', [E.Message,E.ErrorCode])); 
    on E:Exception do
        Writeln(E.Classname, ':', E.Message);
 end;
 Writeln('Press Enter to exit');
 Readln;      
end.