By default, if you don't have a printer/scanner attached to your computer, the port is recognized as old SPP type parallel port.
If you using writefile(), the file is write to SPP output buffer and wait for parallel port to response and output to the port. The device must follow the handshaking transfer between device and PC to get data.
If a parallel port support IEEE-1284 standard, it will allow file transfer from printer thru predefined method like nibble mode, Byte mode, EPP mode or ECP mode.
The device must predefined what time to send data to the parallel port in buffer upon any data request. If your printer don't out something after the host request, it mean your printer just don't output or unlikely to output in this manner.
Then there are nothing to read, readfile() waiting for device to give respond: "Hello, printer, give me some data please."
You probably want to try to readfile() from a scanner and see if it actually work.
Welcome:
Welcome to Alternative Battery Enterprise weblog, Alternative Battery Enterprise is a small business based in Malaysia, that realt/refill/recell or even repair your laptop and notebook battery.
Subscribe to:
Post Comments (Atom)
2 comments:
Hello, Admin!
I loved this post.
Terima kasih
Thank for tell me at least someone need this, I post this message because I am struggling for the same problem a few day ago, our best friends google fail to give me the answer. After fews day of searching for the information about LPT printer port, I come our with the conclusion.
Post a Comment