stdout

问题 I try to pass the stdout of an program in a child process to the stdin in the parents process. In bash this would look like this: wget "adress"|less My code looks like this: int fd[2]; pid_t child_id; int status; char *args[] = {"wget","-O -",argv[1], NULL}; int pipe(int fd[2]); child_id = fork(); if (child_id == -1) { printf ("Fork error\n"); } if (child_id == 0) { close(fd[0]); int c = dup2(fd[1],1); execl ("/usr/bin/wget", "wget", "-qO-",argv[1], NULL); } else{ waitpid(child_id,&status,0);

问题 package MY_TEST; use warnings; use strict; use Win32::Console; my $out = Win32::Console->new( STD_OUTPUT_HANDLE ); sub test_print { $out->Write( "printed with 'Write'\n" ); print( "printed with 'print'\n" ); } When I call this package with this script #!/usr/bin/env perl use warnings; use strict; use 5.10.0; use FindBin qw($RealBin); use MY_TEST; say 'Before "test_print"'; MY_TEST::test_print; say 'After "test_print"'; the output looks like this Before "test_print" printed with 'Write'

问题 I have a console application written with C++. Is there any way to collect all stdout output from it to string/pipe/memory array? PS. I need to do this from within the console app that I'm needing to collect stdout from. Or, in other words, it is collecting from itself. 回答1: Yes. To redirect it to a string , you can use a std::stringstream std::stringstream buffer; std::streambuf * old = std::cout.rdbuf(buffer.rdbuf()); Then, if you do: std::cout << "Example output" << std::endl; std::string

问题 I'm trying to write a Python program that interacts with the bsdgames trek program. It's kind of like Zork with Klingons: * * * S T A R T R E K * * * Press return to continue. What length game: short What skill game: fair Enter a password: hunter2 10 Klingons 2 starbases at 3,6, 0,2 It takes 400 units to kill a Klingon Command: I'm currently trying to use subprocess.Popen() to interact with it: >>> import subprocess >>> t = subprocess.Popen('trek', stdin=subprocess.PIPE, stdout=subprocess

问题 I am after a simple task: reading one line at a time from a file , printing the line and appending all the content in a char array. It all started with a Segmentation fault (core dumped) from my project, I then kept on isolating my code until I reached this: #include <stdio.h> #include <string.h> int main(void) { FILE *fp; fp = fopen("read.txt","r"); char buffer[255]; char longBuff[1024] = ""; while(fgets(buffer, 255, fp)) { printf("%s\n",buffer); strcat(longBuff, buffer); } fclose(fp);

问题 I have a simple haskell program, which do prompt some message to user, with '\n' waiting for user input print user's input If I launch the program from a command prompt or from a cygwin shell which is launched from a command prompt, it is ok. But if I launch the program from ssh shell which is connected to a local cygwin environment, the program don't write anything back to terminal until it exit. It looks like the buffer for STDOUT in ssh shell is not line buffered but block buffered. I don

问题 I've been searching for an answer regarding this issue for a few days now, I hope you guys will be able to assist me. (I've searched and found some solutions, but each has its own issue...). Here is the thing: I'm writing an automation at work, which is responsible for launching an external ".exe" file of a code written by my colleagues. As those programs they write go to customers, I'm not allowed to make any modification to their code. Those programs, once launched, are waiting for specific

问题 Trying to implement a test server in paramiko without having to modify the client for testing , I have stumbled across the problem how to close the stdout stream, making `stdout.read()´ not hang forever without going too low-level on the client's side. So far I have been able to communicate the completed command (simple text output to stdout) execution by: class FakeCluster(paramiko.server.ServerInterface): def check_channel_exec_request(self,channel,command): writemessage = channel.makefile(

问题 Hi I need to show the result in a memo instead using System.out.println, but isn't possible to put the stdout in a list for example and after display the contents of this list in swing memo because I need to display every line of the result in real time or when it is showed. I'm think in something that works like an observer of System.out.println and when some data or information have been printed in the console I want to be able to capture it and display in a memo. For a better comprehension

问题 How can I read from the stdout of my program? One of my threads needs to access the stdout to read what the other threads are logging. I'm using the dear old plain C. 回答1: Make stdout use a pipe by replacing the stdout fd with the write side fd of a pipe using dup. 回答2: You shouldn't. stdout is supposed to be the output to your program and you're not therefore supposed to be reading it in as well. If you want to do this, do your logging elsewhere. 回答3: If I understand you correctly, you want