RECHERCHE AUTOMATIQUE D'UN PORT SERIE

function NumeroPort(nomport:string):string;
var
  KeyHandle: HKEY;
  ErrCode, Index: Integer;
  ValueName, Data: string;
  ValueLen, DataLen, ValueType: DWORD;
begin
  ErrCode := RegOpenKeyEx(
    HKEY_LOCAL_MACHINE,
    'HARDWARE\DEVICEMAP\SERIALCOMM',
    0,
    KEY_READ,
    KeyHandle);

  if ErrCode <> ERROR_SUCCESS then
    raise Exception.Create('erreur d''ouverture');

    Index := 0;
    repeat
      ValueLen := 256;
      DataLen := 256;
      SetLength(ValueName, ValueLen);
      SetLength(Data, DataLen);
      ErrCode := RegEnumValue(
        KeyHandle,
        Index,
        PChar(ValueName),
{$IFDEF DELPHI_4_OR_HIGHER}
        Cardinal(ValueLen),
{$ELSE}
        ValueLen,
{$ENDIF}
        nil,
        @ValueType,
        PByte(PChar(Data)),
        @DataLen);

      if ErrCode = ERROR_SUCCESS then
      begin
        SetLength(Data, DataLen);
      if pos(nomport,valuename)<>0 then result:=data;
        Inc(Index);
      end
      else
    until (ErrCode <> ERROR_SUCCESS) ;
    RegCloseKey(KeyHandle);
end;