stdin

问题 Rust's std::process::Command allows configuring the process' stdin via the stdin method, but it appears that that method only accepts existing files or pipes. Given a slice of bytes, how would you go about writing it to the stdin of a Command ? 回答1: You can create a stdin pipe and write the bytes on it. As Command::output immediately closes the stdin, you'll have to use Command::spawn . Command::spawn inherits stdin by default. You'll have to use Command::stdin to change the behavior. Here is

问题 Rust's std::process::Command allows configuring the process' stdin via the stdin method, but it appears that that method only accepts existing files or pipes. Given a slice of bytes, how would you go about writing it to the stdin of a Command ? 回答1: You can create a stdin pipe and write the bytes on it. As Command::output immediately closes the stdin, you'll have to use Command::spawn . Command::spawn inherits stdin by default. You'll have to use Command::stdin to change the behavior. Here is

问题 Rust's std::process::Command allows configuring the process' stdin via the stdin method, but it appears that that method only accepts existing files or pipes. Given a slice of bytes, how would you go about writing it to the stdin of a Command ? 回答1: You can create a stdin pipe and write the bytes on it. As Command::output immediately closes the stdin, you'll have to use Command::spawn . Command::spawn inherits stdin by default. You'll have to use Command::stdin to change the behavior. Here is

问题 I'm a beginner in X86 assembly language. I know how to read from stdin and write to stdout using build-in functions, but I'm not sure how to do it with plain assembly code(i.e. manipulating registers and taking advantage of system calls). #include <stdio.h> #include <unistd.h> int main(){ /* copy input to output */ char buf[BUFSIZ]; int n; while ((n = read(0, buf, BUFSIZ)) > 0) write(1, buf, n); return 0; } This is the C code I wrote to first read from the standard input (represented by

问题 I'm a beginner in X86 assembly language. I know how to read from stdin and write to stdout using build-in functions, but I'm not sure how to do it with plain assembly code(i.e. manipulating registers and taking advantage of system calls). #include <stdio.h> #include <unistd.h> int main(){ /* copy input to output */ char buf[BUFSIZ]; int n; while ((n = read(0, buf, BUFSIZ)) > 0) write(1, buf, n); return 0; } This is the C code I wrote to first read from the standard input (represented by

问题 I'm a beginner in X86 assembly language. I know how to read from stdin and write to stdout using build-in functions, but I'm not sure how to do it with plain assembly code(i.e. manipulating registers and taking advantage of system calls). #include <stdio.h> #include <unistd.h> int main(){ /* copy input to output */ char buf[BUFSIZ]; int n; while ((n = read(0, buf, BUFSIZ)) > 0) write(1, buf, n); return 0; } This is the C code I wrote to first read from the standard input (represented by

问题 How can I read N int s from the input, and stop reading when I find \n ? Also, how can I add them to an array that I can work with? I'm looking for something like this from C but in python while(scanf("%d%c",&somearray[i],&c)!=EOF){ i++; if (c == '\n'){ break; } } 回答1: In Python 2: lst = map(int, raw_input().split()) raw_input() reads a whole line from the input (stopping at the \n ) as a string. .split() creates a list of strings by splitting the input into words. map(int, ...) creates

问题 Based on my previous question, what would be the proper yet efficient way to determine the size of stdin if stdin is coming from a pipe or a terminal on different systems. I was doing the following, however, based on some comments, it is not the right way, and it might or it might not work on different systems. #include <sys/stat.h> off_t size(FILE *st_in) { struct stat st; if (fstat(fileno(st_in), &st) == 0) return st.st_size; return -1; } 回答1: You can't. Imagine stdin is like a water tap.

来源： https://stackoverflow.com/questions/64399326/how-to-get-stdin-in-c-to-read-external-data-from-another-program

来源： https://stackoverflow.com/questions/64399326/how-to-get-stdin-in-c-to-read-external-data-from-another-program