c++ - Using popen to write in a pipe only send data when pipe is closed -

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I am using popin to open a writing pipe and send commands to an application. The problem is that when I turn off the pipe, the commands are sent only to the app. 

  FILE * fp = open (target_app, "w"); Fwrite (command, 1, command. (Size), fp); Getchar (); // Wait for a key, because I do not want to end the application pclose (FP); // At this point, the command is sent

What could be wrong?


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