program code from linux to windows

[Fixik2022]

Hi. need help reading data from usb

Code: Pascal  [Select][+][-]

1. TFileStream.Create('/dev/usb/lp0',fmOpenReadWrite);

[MarkMLl]

libusb, and generally speaking trying to treat it like a stream won't work.

Broadly speaking, the data coming from (or expected by) a USB device is highly-device-specific: unless it's one of the standard classes, and in that case I'd expect it to be at e.g. /dev/lp0 rather than /dev/usb/lp0 or somewhere on the /dev/bus/usb tree.

If you were actually trying to read /dev/lp0 you could probably get at that via the kernel; same applies to network devices (i.e. USB-connected Ethernet) etc. However for just about anything else you'll find few alternatives to going via libusb, even if somebody's written a higher-level library.

MarkMLl

[Fixik2022]

Code: [Select]

FUsb:TFileStream;

Code: [Select]

function TForm1.OpenUsb:boolean;
begin
  result:=false;
  try
    FUsb:=TFileStream.Create('/dev/lp0',fmOpenReadWrite);
    result:=true;
  except
    on e:exception do
    begin
      log(e.message);
    end;
  end;
end;   

does not work on windows

[Thaddy]

Of course not!
'/dev/lp0' is unix specific and is a pseudo file. There is no direct Windows equivalent.

[Fixik2022]

how can i do it for windows

[Thaddy]

libusb.dll is available for Windows, as Mark implicitly wrote.
FPC comes with bindings for it.