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Re: When Speed Replaces Satisfaction in Coding 3 Days Ago by Reverend Jim … needed to spawn an external process in Python and capture stdout in real time. The subprocess docs detail the methods and… stdout? 14 Years Ago by ChaseRLewis I know printf prints to "stdout" how exactly can I change the pointer to a class of mine that i'd prefer to handle the output string? or is it better to just process using sprintf and manage the strings? Would there be any issues with the first method? Re: stdout? 14 Years Ago by WaltP [QUOTE=ChaseRLewis;]I know printf prints to "stdout" how exactly [/quote] By definition on the standard. Beyond that, don't know, don't care. Just need to know that it works.... [QUOTE=ChaseRLewis;]can I change the pointer to a class of mine that i'd prefer to handle the output string? [/quote] What pointer? stdout howto, bottlenecks, overhead? 15 Years Ago by dzhugashvili … <cracker options>[/CODE] or [CODE]wordgen --stdout | wordmangle --stdout | cracker <cracker options>[/CODE] or however… it works. Here are my questions: how does --stdout work (as far as implementation in C++)? How can…this method, or some type of bottleneck from --stdout and --stdin not being able to transfer data between… Re: stdout howto, bottlenecks, overhead? 15 Years Ago by Salem > how does --stdout work (as far as implementation in C++)? How can I …, and if some argv[i] is "--stdout" then you output to stdout. Otherwise, one would presume it expects a filename… Re: stdout howto, bottlenecks, overhead? 15 Years Ago by dzhugashvili …: [CODE]char wordtopass[]="passme"; int main() { fputs(wordtopass,stdout) }[/CODE] print.cpp: [CODE]int main() { fgets(wordtopass); cout <… Re: stdout? 14 Years Ago by mrnutty >>[B]By definition on the standard.[/B] just to clarify, usually the standard are terminals in computers, but for other things, it could be definitely something else. Re: stdout? 14 Years Ago by rubberman To print to another output stream using the C-style printf() functions, you would use fprintf(FILE* fp, const char* fmt, ...) function. However, for C++ it would be preferable to use output stream objects such as ostream, ofstream, ostringstream, etc. You can create your own output stream class that provides the behavior you want. Re: How to redirect stdout to file then back to screen/terminal? 15 Years Ago by rciprogrammer …how its done (for anyone interested): [code=c++] fprintf(stdout, "This will go to the terminal.\n");…;/tmp/somefile.txt", "w", stdout); fprintf(stdout, "This will go to the file /tmp… the terminal dup2(fd, fileno(stdout)); close(fd); clearerr(stdout); fsetpos(stdout, &pos); fprintf(stdout, "This will go to… Subprocess stdout readline block 16 Years Ago by tzushky …launch them on separate PCs). I need the server stdout because it displays some data for evaluating their communication…server through a [B]subprocess.Popen[/B] giving its stdout to [B]PIPE[/B] [CODE=Python] from …find("what want") == -1: line = p.stdout.readline() print 'Final line', line [/CODE] The fact is … Re: Subprocess stdout readline block 16 Years Ago by Gribouillis …a little program which can read from a subprocess' stdout in a non blocking way. I start a thread… """Start a subprocess and read its stdout in a non blocking way""" import …("line %d"%i ) sys .stdout .flush () sleep (3 ) except IOError :# stdout was closed pass [/code] With a little … How to read stdout from an external process in Java 17 3 Years Ago by dimitrilc … private static final Runtime runtime = Runtime.getRuntime(); ## Read stdout from scripts ## If the security policy allows it, it …e.printStackTrace(); } } } ## Summary ## We have learned how to read stdout from an external process using the brand new `inputReader()` methods… Redirection of stdout to console and file with verbosity turned ON 11 Years Ago by arty.net …store_true', help='Enable printing of status messages to stdout.') #parser.add_argument('-q', dest='verbose', action='…Disable printing of status messages to stdout.') args = parser.parse_args() sys.stdout = Logger() if args.verbose:… Re: Subprocess stdout readline block 16 Years Ago by retrograde …the python program to, among other things, monitor the stdout of the kernel, grab the text it spits out…subprocess.Popen("kernel", stdin=subprocess.PIPE, stdout=subprocess.PIPE) msg = kernel.stdout.readline() # blocks [/code] I need to be…kinds of reads, but since the Popen object provides stdout only as a file, I seem to be … Re: Subprocess stdout readline block 16 Years Ago by Gribouillis …quot;"Start a subprocess and read its stdout in a non blocking way Linux only: we… and we pass Socket.fileno() as subprocess Popen's stdout argument. """ sock ,childsock =socket … =subprocess .Popen ( ["python",prog ], #shell=True, stdout =childsock .fileno (),#subprocess.PIPE, #close_fds = False, ) sock … How to redirect stdout to file then back to screen/terminal? 15 Years Ago by rciprogrammer …put output back to the screen/terminal. [code=c++] fprintf(stdout, "This will go to the terminal.\n"…("/tmp/somefile.txt", "w"); fprintf(stdout, "This will go to the file /tmp/somefile.txt….\n"); ... fclose(stdout); fprintf(stdout, "I WANT this to go to the terminal.\n… Real time redirecting of stdout 14 Years Ago by acrocephalus …://www.blog.pythonlibrary.org/2009/01/01/wxpython-redirecting-stdout-stderr/"]http://www.blog.pythonlibrary.org/2009/01…/01/wxpython-redirecting-stdout-stderr/[/URL]. My code has some loops, and …line. However, it seems that in this example the stdout is only redirected when the whole function is finished.… Re: Subprocess stdout readline block 16 Years Ago by tzushky … I need something else then the pipe to store the stdout, so i opened a file in which I write the… stdout, and after I kill the process I parse the file. … in Python to really end the file (or event he stdout when I want) ...well..there just seems to be too… Re: nodejs and short alias for process.stdout.write 8 Months Ago by Bhavika_1 …define a shorter alias for process.stdout.write:** const write = process.stdout.write.bind(process.stdout); // Now you can use …a constant that holds a reference to the process.stdout.write function. By using bind, we ensure … readable and concise, especially if you call process.stdout.write frequently. Remember, while using such aliases can… Re: Subprocess stdout readline block 16 Years Ago by tzushky … end) will only stop upon finding an EOF in the stdout, but since the application is a server and never exits…, the stdout is therefore incomplete from its point of view-> noEOF… Redirect stdin and stdout 14 Years Ago by slatk3y … <sys/types.h> #define STDIN fileno(stdin) #define STDOUT fileno(stdout) #define STDERR fileno(stderr) int main(int argc, char… process */ close(PARENTWRITE); close(PARENTREAD); dup2(CHILDREAD, STDIN); dup2(CHILDWRITE, STDOUT); close(CHILDREAD); close(CHILDWRITE); execv("cat", NULL); } else… Re: Subprocess stdout readline block 16 Years Ago by Gribouillis In fact the above solution doesn't work that well, because the program sometimes crashes when it tries to close the pipe while the thread is reading. I think that a possible solution would be to start a 2nd subprocess which would read the 1st subprocess' stdout and redirect it to a socket. One would then read into the socket in non blocking mode. Re: Subprocess stdout readline block 16 Years Ago by retrograde That pipe class looks pretty good. I'll try implementing it. Can you elaborate on the situation in which it fails? Are you referring to the case when the distant program closes stdout? Re: Subprocess stdout readline block 16 Years Ago by retrograde … first line in your Pipe.close() method). Since this is stdout, it belongs either to the distant process or at the… trap stdout in C 16 Years Ago by flipjoebanana Hello, Is there is a way within C to trap stdout and prevent it from displaying. In my example I call … to print an error message to stdout. Is there a way to prevent messages to stdout from being displayed while my program… calls on a function(trapping anything going to stdout). I know I could just modify the parameters to it… Re: How to redirect stdout to file then back to screen/terminal? 15 Years Ago by rciprogrammer … to this page you gave, something like: [code=c++] fprintf(stdout, "This will go to the terminal.\n"); FILE… the file /tmp/somefile.txt.\n"); ... fclose(myOutput); fprintf(stdout, "I WANT this to go to the terminal.\n… Log return code, stdout and stderr from an application 15 Years Ago by Prahaai …boot.ini" -m0=LZMA -ms=on -mmt=on -mx9', stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True) ret = p.communicate…tried to create a hook class to re-write sys.stdout, so that all messages that print on the screen … functions in Python. I don't know much about sys.stdout, sys.stderr, print >>, or buffers. Any help … Socket Blocking on subprocess stdout? 11 Years Ago by 3e0jUn … self.proc.stdin.flush() self.proc.stdout.flush() while True: line = self.proc.stdout.readline() line = line.decode() if …= subprocess.Popen( ["/bin/bash"], stdout=subprocess.PIPE, stderr=subprocess.STDOUT, stdin=subprocess.PIPE) It seems to work … Re: trap stdout in C 16 Years Ago by Ancient Dragon How about dup stdout, close stdout handle, call the function, then finally restore the stdout handle. [URL="http://wwwcgi.rdg.ac.uk:8081/cgi-bin/cgiwrap/wsi14/poplog/man/2/dup"]see man page for dup function[/URL] Re: Real time redirecting of stdout 14 Years Ago by acrocephalus Hello! I like your solution. However, there are a couple of issues. First of all, it is not a "real time" redirection, as it only sends the stdout to the console when the function has finished. Then, is it possible to embed the console inside the main frame? I attach the fill code. Cheers! Dani