Question

today is my first day with Delphi.

I have record like this:

type 
  FT_Device_Info_Node = record
    Flags         : DWord;
    DeviceType    : Dword;
    ID            : DWord;
    LocID         : DWord;
    SerialNumber  : array [0..15] of Char;
    Description   : array [0..63] of Char;
    DeviceHandle  : DWord;
  end;

Later I can read only arrays, e.g. it works: FT_DeviceInfoList[0].SerialNumber
But I can’t get access to any of DWord item, e.g. FT_DeviceInfoList[0].ID is impossible.

Could you clarify it for me?

EDIT:
Here is button click procedure where I want to fet info from record:

procedure TForm1.checkFTDIClick(Sender: TObject);
var
  i : integer;
begin
  ftStatus := FT_CreateDeviceInfoList(@dwNumDevs);
  SetLength(FT_DeviceInfoList,dwNumDevs);
  ftStatus :=  FT_GetDeviceInfoList(FT_DeviceInfoList, @dwNumDevs);
  If ftStatus <> FT_OK then ShowMessage('Error '+IntToStr(ftStatus));

  Form1.ComboBox1.Items.Clear;
  for i:=0 to dwNumDevs-1 do
  begin
    Form1.ComboBox1.Items.Add(FT_DeviceInfoList[i].Description);//works
    //Form1.ComboBox1.Items.Add(FT_DeviceInfoList[i].ID);//compilation error
  end;
  Form1.ComboBox1.ItemIndex := 0;

end;

FT things are from FTDI library and returned status is OK.

Answer 1

Your intended code is:

Form1.ComboBox1.Items.Add(FT_DeviceInfoList[i].ID);

This results in a compilation error. That’s because Add expects a parameter of type string. But you are passing a DWORD, an integral parameter.

Convert it from an integral data type to a string by calling IntToStr:

Form1.ComboBox1.Items.Add(IntToStr(FT_DeviceInfoList[i].ID));