Feof Problems

mrcastrovinci

Hello All,
This is my first post in the forum.... I have a very simple code, and have searched and searched and keep seem to get it to work. Currently it read my fsocket and then returns my string ASCII, it just get hung up in infinate loop

while (! feof ($fp))
{
$c= fgetc($fp);
echo $c;
if($c === false) break;
// ... do something with $c
fclose($fp);
}

Now I have two issues the first is that I have to use fgetsC because I cant get my string to return unless I read each character one by one. I am reading directly from the device NOT a file. Am I possibly using the wrong method? If someone has a suggestion on this Im open for trying it 🙂 I have tried the streaming socket thing with no luck.

The device I am connecting to is suppose to send a carriage return when complete. Unfortunely the string has spaces in it so i cant use that as a break.

If more code is needed let me know. Thanks for any help!

dagon

i would start with the Socket Functions

mrcastrovinci

Ok So I went to the link that you posted and it had some good feedback. I was able to connect using the "client method" since my device is setup as a server. Let me explain slightly better since I am still having issues

I have a device at home its an ethernet to rs485 converter which is setup as server mode. The protocol is ASCII not modbus. I can read the device when I read it character by character, but the loop doesnt break. Now I think this is because the device either isnt sending a carriage return or I am not coding PHP correctly to break the loop for that? Unfortuneltly I can not modify the device as it has limited settings so how do I tell when no more characters are coming in so I can echo the characters and close the connection?

$input = socket_read($socket, 2048);
echo "Response from server is: $input\n";
sleep(5);

while (! feof ($fp))
{
$c= fgetc($fp);
echo $c;
if($c === false) break;
// ... do something with $c
fclose($fp);
}

mrcastrovinci

Right after I posted my prevous response. I got this to work (Roundaboutly). It works great but for knowledge I would still like to be able to do it using the read function or recv function. I think it will help my devl later down the road. So the question remains how does socket_recv or socket_read break when a carriage return is sent?
:bemused:

$current_line = fgetc($fp);
while (!feof($fp)) {
// process current line
$current_line = fgetc($fp);
if($current_line === "\r") break;
echo $current_line;
}
fclose($fp);

dagon

the break could be \r or \n or \r\n check for all three see if that helps