stdin

I need to read something like: 5 60 35 42 2 38 6 5 8 300 1500 900 And then save the first line in an array. After calling other functions do the same with the next line, and so on. I try with gets() and then use sscanf() to scan the integers from the string, but I don't know how to read n numbers from a string. I've seen input files like this for competitions before. If speed is more of an issue than error detection, you could use a custom routine. Here's one similar to that I use: void readintline(unsigned int* array, int* size) { char buffer[101]; size=0; char* in=buffer; unsigned int* out

Let's say I want to pipe input to a Python program, and then later get input from the user, on the command line. echo http://example.com/image.jpg | python solve_captcha.py and the contents of solve_captcha.py are: import sys image_url = sys.stdin.readline() # Download and open the captcha... captcha = raw_input("Solve this captcha:") # do some processing... The above will trigger a EOFError: EOF when reading a line error. I also tried adding a sys.stdin.close() line, which prompted a ValueError: I/O operation on closed file . Can you pipe information to stdin and then later get input from the

I write a lot of little scripts that process files on a line-by-line basis. In Perl, I use while (<>) { do stuff; } This is handy because it doesn't care where the input comes from (a file or stdin). In Python I use this if len(sys.argv) == 2: # there's a command line argument sys.stdin = file(sys.argv[1]) for line in sys.stdin.readlines(): do stuff which doesn't seem very elegant. Is there a Python idiom that easily handles file/stdin input? The fileinput module in the standard library is just what you want: import fileinput for line in fileinput.input(): ... import fileinput for line in

I found the very useful syntax parser.add_argument('-i', '--input-file', type=argparse.FileType('r'), default='-') for specifying an input file or using stdin—both of which I want in my program. However, the input file is not always required. If I'm not using -i or redirecting input with one of $ someprog | my_python_prog $ my_python_prog < inputfile I don't want my Python program to wait for input. I want it to just move along and use default values. The standard library documentation for argparse suggests this solution to allow optional input/output files: >>> parser = argparse

What I want to do is the following: read in multiple line input from stdin into variable A make various operations on A pipe A without losing delimiter symbols ( \n , \r , \t ,etc) to another command The current problem is that, I can't read it in with read command, because it stops reading at newline. I can read stdin with cat , like this: my_var=`cat /dev/stdin` , but then I don't know how to print it. So that the newline, tab, and other delimiters are still there. My sample script looks like this: #!/usr/local/bin/bash A=`cat /dev/stdin` if [ ${#A} -eq 0 ]; then exit 0 else cat ${A} | /usr

I'm trying to write a Delphi console application that creates a TStream for its standard input, and another TStream for its standard output. (It will be launched by a host app with its input and output redirected to pipes, and will be passing binary data to/from that host app, so TStream will be much better-suited to the task than ReadLn/WriteLn.) How do I go about opening a TStream on standard input or standard output? Allen Bauer Off the top of my head: InputStream := THandleStream.Create(GetStdHandle(STD_INPUT_HANDLE)); OutputStream := THandleStream.Create(GetStdHandle(STD_OUTPUT_HANDLE));

I am trying to send commands to an open cmd.exe process using StandardInput.WriteLine(str) , however none of the commands seem to be sent. First I open a process, with a global variable p ( Process p ). p = new Process() { StartInfo = { CreateNoWindow = true, UseShellExecute = false, RedirectStandardError = true, RedirectStandardInput = true, RedirectStandardOutput = true, FileName = @"cmd.exe", Arguments = "/C" //blank arguments } }; p.Start(); p.WaitForExit(); After, I try to send a command using a simple method, that logs the result in a text box. private void runcmd(string command) { p

I have read this question: Java Programming: call an exe from Java and passing parameters And this answer is good enough https://stackoverflow.com/a/5604756/2674303 But I additionally want to pass parameters to stdin of external process and read from stdout of this process. How can I do this? My efforts : main method: public class ProcessBuilderTest { public static void main(String[] args) throws IOException, InterruptedException { ProcessBuilder pb = new ProcessBuilder("C:\\Program Files\\Java\\jdk1.8.0_111\\bin\\java", "-cp", //class path key "C:\\Users\\redwhite\\IdeaProjects\\HelloMyWorld\