return -1:error newfd:right 1/*whotofile.c2* purpose: show how to redirect output for another program3* idea: fork, then in the child , redirect output , then exec4*/5#include <stdio.h>6#include <fcntl.h>7intmain(void) {8intpid, fd;9printf("About to run the who.\n");10if...
我正在嘗試將 stdout 和 stderr 重定向到日誌文件。 /* Redirecting stderr buffer to stdout */dup2(fileno(stdout), fileno(stderr));/* Redirecting stdout buffer to logfile */if((LogStream = freopen(LogPath.c_str(),"w",stdout)) ==NULL) {cout<<"Failed to redirect console logs\n"; } ...
("Failed to open file"); return 1; } // 将stderr重定向到文件 if (freopen("error.log", "w", stderr) == NULL) { perror("Failed to redirect stderr"); return 1; } // 在stderr上输出一条错误信息 fprintf(stderr, "This is an error message\n"); // 关闭文件 fclose(file); ...
I then redirectstdinto this file: ./a.out < input.txt The program works but its output is a bit messed up: Enter a: Enter b: a + b =30 Is there a way to redirect stdin to stdout so the output appears as if a user typed the values manually, ie: Enter a:10Enter b:20a + b...
I was trying to fork a process and redirect stdout of the parent to the writing end of the pipe and stdin of the child to the reading end of the pipe. The child is supposed to read integers until the parent prints zero. the parent prints from 1 to 3 and then pri...
用法: FILE *freopen(char *filename, char *type, FILE *stream); 程序例: #include <stdio.h> int main(void) { /* redirect standard output to a file */ if (freopen("OUTPUT.FIL", "w", stdout) == NULL) fprintf(stderr, "error redirectingstdout\n"); ...
To redirectstdoutto the Log window, issue the following command: SET INTERCEPT ON FILE stdout ; With thisSETcommand, you will capture not onlystdoutfrom your program, but also from interactive function calls. For example, you can interactively callprintfon the command line to display a null-ter...
如何将printf输出重定向到文件？使用freopen(new_filename, "w", stdout)
| 1 | stdout | Standard output | | 2 | stderr | Standard error | 标准I/O 文件的重定向: # redirect stdout to output.txt ls > output.txt ls 1> output.txt # append stdout to output.txt ls -l >> output.txt # redirect stderr to err.txt ...
如何将printf输出重定向到文件？使用freopen(new_filename, "w", stdout)