how to know commandline is empty or not ??

[RajendraNPTL]

hello.. everyone
i am writing a c++ program in Linux..
i am reading a line from commandline at run time using "getline(std::cin,str);". now, what i want is if i left the commandline as idle (terminal as idle), then i want to know that the commandline is empty... is it possible ???
any comment is appreciable..

thank you

[Banfa]

Not really, the problem is if you try to get data when there is nothing waiting the cin line waits for data to be input. None of the other methods on cin indicate that there is no data available.

[RajendraNPTL]

thank you soo much @Banfa
But, is there any equivalent method in c++, like CommandLine BufferedReader in java ????

[weaknessforcats]

The problem is that your program is not running while the input is requested. If the input never comes your program hangs forever.

You should be able to get your input using a separate thread to return the data entered. If the thread fails to return after a set period you could delete the thread and call that your "empty" command line.

[RajendraNPTL]

Thank you @weaknessforcats
My program is running. The actual thing is that i want that the control have to do multiple tasks in my program. if i enter data in commandline and hit enter it wanna go to send function, read data and send. If i am not typing anything then it will be in receiving mode..( Like chat program). For this one i don't want to use threads, bcozz program becomes complex. that's why i questioned about commandline. Is there any possible ways ??
thank you !!