I am writing a program and i decided for input/output it would be best to allow for custom commands. I have written a config file and defined a series of commands (just echo, etc) and call these within the program using system(). The problem is that i need to get input from these commands. I tried using "read ANSWER" and then getenv("ANSWER) but this returns a null string. What is the best method to do this?
c++ get variable set by call to system()
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Since you don't provide any code, I have to use my imagination. Let me know if I get it wrong. You are doing something like this:
And, you want to be able to read the output that is generated by that command. If I am wrong, please provide the code you are using in your question.
If I am right, then, you want to use
popen
instead. It opens a C style I/O stream. You can specify either for reading or writing (but not both). You want to use"r"
for reading. Close the stream withpclose
when you are done.