COM Ports im System auslesen

[Jakson]

Hallo zusammen

Ich habe gerade untersucht was die Jedi-API so macht und festgestellt das ganze lässt sich ohne die Jedi-API auch bewerkstelligen.

Die Funktion "SetupDiGetClassDevs" ruft auch nur einen definierten Registry Pfad auf und werdet die Daten daraus aus.

Hier meine Unit

Code:

unit SerialPorts;

interface

type
  SerialPort_Rec = record
    PortNr       : Word;
    Linked       : Boolean;
    PortName,
    Description,
    FriendlyName,
    Decive,
    KeyDevice,
    KeyEnum      : String;
  end;
  SerialPort_Ar = Array of SerialPort_Rec;

  function GetComPorts:SerialPort_Ar;

implementation

uses Windows, SysUtils, Classes, Registry;

const Key_Devices = '\SYSTEM\CurrentControlSet\Control\DeviceClasses\{86e0d1e0-8089-11d0-9ce4-08003e301f73}\';
      Key_Enum    = '\SYSTEM\CurrentControlSet\Enum\';

procedure SortComPorts(VAR Daten:SerialPort_Ar);
var Sort_Max,
    Sort_From,
    Sort_To,
    Sort_Size : LongInt;
    TempData  : SerialPort_Rec;
begin
 if Daten = NIL then
  Exit;

 Sort_Max  := High(Daten);
 Sort_Size := Sort_Max shr 1;  { div 2 }
 while Sort_Size > 0 do
  begin
   for Sort_From := 0 to Sort_Max - Sort_Size do
    begin
     Sort_To := Sort_From;
     while (Sort_To >= 0) AND (Daten[Sort_To].PortNr > Daten[Sort_To + Sort_Size].PortNr) do
      begin // Tauschen
       TempData                   := Daten[Sort_To];
       Daten[Sort_To]             := Daten[Sort_To + Sort_Size];
       Daten[Sort_To + Sort_Size] := TempData;
       Dec(Sort_To,Sort_Size);
      end;
    end;
   Sort_Size := Sort_Size shr 1; { div 2 }
 end;
end;

function GetComPorts:SerialPort_Ar;
var Reg          : TRegistry;
    Keys         : TStrings;
    Count,
    Index,
    Linked       : Integer;
    Key1,
    Key2,
    Device,
    Description,
    FriendlyName,
    PortName     : String;
begin
 Result := NIL;
 Reg    := TRegistry.Create;
 Keys   := TStringList.Create;
 try
  Reg.RootKey := HKEY_LOCAL_MACHINE;
  if Reg.OpenKeyReadOnly(Key_Devices) then
   begin
    Reg.GetKeyNames(Keys);
    if Keys.Count > 0 then
     begin
      Index := 0;
      SetLength(Result,Keys.Count);
      for Count := 0 to Keys.Count-1 do
       begin
        Key1 := Key_Devices+Keys[Count] + '\';
        if Reg.OpenKeyReadOnly(Key1) then
         begin
          Device := Reg.ReadString('DeviceInstance');
          Key2   := Key_Enum + Device + '\';
          if Reg.OpenKeyReadOnly(Key1 + '#\Control\') then
           begin
            Linked := Reg.ReadInteger('Linked');
            if Reg.OpenKeyReadOnly(Key2) then
             begin
              if (Reg.ReadString('Class') = 'Ports') AND Reg.KeyExists('Device Parameters') then
               begin
                FriendlyName := Reg.ReadString('FriendlyName');
                Description  := Reg.ReadString('DeviceDesc');
                if Reg.OpenKeyReadOnly(Key2+'\Device Parameters\') AND Reg.ValueExists('PortName') then
                 begin
                  PortName := Reg.ReadString('PortName');
                  if Pos('COM',PortName) = 1 then
                   begin
                    Delete(Description,1,Pos(';',Description));
                    Result[Index].PortNr       := StrToIntDef(Copy(PortName,4),0);
                    Result[Index].Linked       := Linked > 0;
                    Result[Index].PortName     := PortName;
                    Result[Index].Description  := Description;
                    Result[Index].FriendlyName := FriendlyName;
                    Result[Index].Decive       := Device;
                    Result[Index].KeyDevice    := Key1;
                    Result[Index].KeyEnum      := Key2;
                    Inc(Index);
                   end;
                 end;
               end;
             end;
           end;
         end;
       end;
      SetLength(Result,Index);
     end;
   end;
 finally
  Keys.Free;
  Reg.CloseKey;
  Reg.Free;
  SortComPorts(Result);
 end;// finally
end;

end.