Hello, I am writing a wrapper to a basic Input/Output programs (where
you type a one line command at a time and then get 0 or more lines of
output before you can input the next command).
I'm sorry if this problem description is a bit long, but I wanted to
make the problem clear.
Example run of the original program:
C:\home\>start
Starting up program
[Welcome to program v.X.Y.Z]
blahblahblah
and some more lines
>input command
program response...
more program response...
etc.
>another command
...
This is what the wrapper is expected to do...
1: Start up the program.
2: Forward the startup printouts by the program until the line where
it first asks for a command.
3: When waiting for input, input a command from a sequential list of
strings (or other source of strings).
4: Forward the programs printouts until all lines are read and the
program prompts for new command.
5: Repeat 3-4 until list is depleted or program is terminated and then
close the program.
Now, to the problem:
In step 2/4, how to read all lines except the one which is unfinished
(in the example, the lines beginning with >) and waiting for input?
My attempts use something like this:
proc = Popen(['programname'], stdout = PIPE, stdin = PIPE )
for string_element in string_source :
proc.stdin.write(string_element)
lines = proc.stdout.readlines()
method_that_processes_output(lines)
The problem with this is that stdout.readlines() doesn't return since
it reads until EOF...
I tried instead to use:
lines = []
line = proc.stdout.readline()
while line :
lines.append(line)
line = proc.stdout.readline()
This prints out everything except the ">" line, which is good. But
then freezes while waiting for input, which is bad.
Any suggestions on how to solve this in a good way?
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