Net::Telnet problems with Net::Telnet in handling inputs

ravi_sha has asked for the wisdom of the Perl Monks concerning the following question:

Hi, I need to navigate a text based menu with using Net::Telnet module, capture the out put into a file and parse it. In the menu based navigation after the selection of first 2 hirercies .....when i send a key for next menu navigation ....the module seems to myterious send some "\r" / "\n" ...i can't figure out wher it is picking it from ..... hence causing me the program to navigate to wrong menus selection.... how could this be handled any help/hint is appreciated... also i observed at times the output of a previous selection is sent on subsequent selection at times. i have tried with both input_record_seperator and out_put_record_seperated ...n they haven been of much help. appreciate quick responses

Comment on Net::Telnet problems with Net::Telnet in handling inputs

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Re: Net::Telnet problems with Net::Telnet in handling inputs by robartes (Priest) on Mar 25, 2003 at 06:39 UTC
I don't know if this will help you, but have a look at the chomp function to lop off trailing newline characters. also i observed at times the output of a previous selection is sent on subsequent selection at times Hmm. If you are talking about the menu of a previous key press being sent with a next one, then I'd say this is a buffering issue. Try unbuffering STDOUT: `select((select STDOUT, $\|++)[0]);` [download] CU Robartes-	[reply] [d/l]
Re: Net::Telnet problems with Net::Telnet in handling inputs by castaway (Parson) on Mar 25, 2003 at 12:41 UTC
From the Net::Telnet doc: `The output record separator for print() and cmd() is set to "\n" by de +fault, so that you don't have to append all your commands with a newl +ine. To avoid printing a trailing "\n" use put() or set the output_re +cord_separator to "".` [download] Which means whenever you use 'print' or 'cmd' it will send a newline, whether you wanted one or not. Further: `In the input stream, each sequence of carriage return and line feed (i +.e. "\015\012" or CR LF) is converted to "\n". In the output stream, +each occurrence of "\n" is converted to a sequence of CR LF. See binm +ode() to change the behavior. TCP protocols typically use the ASCII s +equence, carriage return and line feed to designate a newline.` [download] Eg: All newlines are sent as "\r\n", as that is how Telnet does newlines. Maybe you should show some code where you tried changing the output_record_separator, or try using put() ? C.	[reply] [d/l] [select]