COM-Schnittstelle: Gerätenamen ermitteln

[v2afrank]

Ich weiss leider nicht mehr wo ich das herhabe aber der Code sollte Dir weiterhelfen.
interface

Delphi-Quellcode:

uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, JwaWinType, SetupApi, Cfg, CfgMgr32, StdCtrls;

procedure FindComports(var Astringlist:TStringlist);
implementation
 // Delphi wrapper for CM_Get_Device_ID 

function GetDeviceID(Inst: DEVINST): string; 
var 
  Buffer: PTSTR; 
  Size: ULONG; 
begin 
  CM_Get_Device_ID_Size(Size, Inst, 0); 
  // Required! See DDK help for CM_Get_Device_ID 
  Inc(Size); 
  Buffer := AllocMem(Size * SizeOf(TCHAR)); 
  CM_Get_Device_ID(Inst, Buffer, Size, 0); 
  Result := Buffer; 
  FreeMem(Buffer); 
end; 

// Delphi wrapper for SetupDiGetDeviceRegistryProperty

function GetRegistryPropertyString(PnPHandle: HDEVINFO; const DevData: TSPDevInfoData; Prop: DWORD): string;
var
  BytesReturned: DWORD;
  RegDataType: DWORD;
  Buffer: array [0..1023] of TCHAR;
begin
  BytesReturned := 0;
  RegDataType := 0;
  Buffer[0] := #0;
  SetupDiGetDeviceRegistryProperty(PnPHandle, DevData, Prop,
    RegDataType, PByte(@Buffer[0]), SizeOf(Buffer), BytesReturned);
  Result := Buffer;
end;

function ExtractBus(DeviceID: string): string;
begin
  Result := Copy(DeviceID, 1, Pos('\', DeviceID) - 1);
end;


procedure FindComports(var Astringlist:TStringlist);
const
  GUID_DEVINTERFACE_COMPORT: TGUID                = '{86e0d1e0-8089-11d0-9ce4-08003e301f73}';
  GUID_DEVINTERFACE_SERENUM_BUS_ENUMERATOR: TGUID = '{4D36E978-E325-11CE-BFC1-08002BE10318}';
var
  PnPHandle: HDEVINFO;
  DevData: TSPDevInfoData;
  DeviceInterfaceData: TSPDeviceInterfaceData;
  FunctionClassDeviceData: PSPDeviceInterfaceDetailData;
  Success: LongBool;
  Devn: Integer;
  BytesReturned: DWORD;
  SerialGUID: TGUID;
  Inst: DEVINST;
  RegKey: HKEY;
  RegBuffer: array [0..1023] of Char;
  RegSize, RegType: DWORD;
  FriendlyName: string;
  PortName: string;
  DeviceDescription: string;
  Bus: string;

  TestHandle : integer;
  i:integer;
begin

  // these API conversions are loaded dynamically by default

  LoadSetupApi;
  LoadConfigManagerApi;
  // enumerate all serial devices (COM port devices)
    SerialGUID := GUID_DEVINTERFACE_COMPORT; // GUID_DEVINTERFACE_SERENUM_BUS_ENUMERATOR;
  PnPHandle := SetupDiGetClassDevs(@SerialGUID, nil, 0, DIGCF_PRESENT or DIGCF_DEVICEINTERFACE);
  if PnPHandle = Pointer(INVALID_HANDLE_VALUE) then
    Exit;
  Devn := 0;
  repeat
    DeviceInterfaceData.cbSize := SizeOf(TSPDeviceInterfaceData);
    Success := SetupDiEnumDeviceInterfaces(PnPHandle, nil, SerialGUID, Devn, DeviceInterfaceData);
    if Success then
    begin
      DevData.cbSize := SizeOf(DevData);
      BytesReturned := 0;
      // get size required for call
      SetupDiGetDeviceInterfaceDetail(PnPHandle, @DeviceInterfaceData, nil, 0, BytesReturned, @DevData);
      if (BytesReturned <> 0) and (GetLastError = ERROR_INSUFFICIENT_BUFFER) then
      begin
        // allocate buffer and initialize it for call
        FunctionClassDeviceData := AllocMem(BytesReturned); 
        FunctionClassDeviceData.cbSize := SizeOf(TSPDeviceInterfaceDetailData); 

        if SetupDiGetDeviceInterfaceDetail(PnPHandle, @DeviceInterfaceData,
          FunctionClassDeviceData, BytesReturned, BytesReturned, @DevData) then
        begin 
          // gives the friendly name of the device as shown in Device Manager 
          FriendlyName := GetRegistryPropertyString(PnPHandle, DevData, SPDRP_FRIENDLYNAME);
          // gives a device description
          DeviceDescription := GetRegistryPropertyString(PnPHandle, DevData, SPDRP_DEVICEDESC);
          // now try to get the assigned COM port name 
          RegKey := SetupDiOpenDevRegKey(PnPHandle, DevData, DICS_FLAG_GLOBAL, 0, DIREG_DEV, KEY_READ); 
          RegType := REG_SZ; 
          RegSize := SizeOf(RegBuffer); 
          RegQueryValueEx(RegKey, 'PortName', nil, @RegType, @RegBuffer[0], @RegSize); 
          RegCloseKey(RegKey); 
          PortName := RegBuffer; 
          Inst := DevData.DevInst;
          CM_Get_Parent(Inst, Inst, 0);
          Bus := ExtractBus(GetDeviceID(Inst));
          Astringlist.Add(PortName + ' (' + DeviceDescription + ', ' + Bus+')');
        end;
        FreeMem(FunctionClassDeviceData);
      end;
    end;
    Inc(Devn);
  until not Success;
  SetupDiDestroyDeviceInfoList(PnPHandle);

  // unload API conversions
  UnloadSetupApi;
  UnloadConfigManagerApi;

end;

Dieser Code listet Dir die Comports wie der gerätemanager auf. Virtuelle Ports werden allerdings nicht aufgelistet.