eof

问题 I'm trying to get Python to send the EOF signal ( Ctrl + D ) via Popen() . Unfortunately, I can't find any kind of reference for Popen() signals on *nix-like systems. Does anyone here know how to send an EOF signal like this? Also, is there any reference of acceptable signals to be sent? 回答1: EOF isn't really a signal that you can raise, it's a per-channel exceptional condition. (Pressing Ctrl + D to signal end of interactive input is actually a function of the terminal driver. When you press

问题 I'm learning the C programming on a raspberry pi, however I found that my program never catches the EOF successfully. I use char c=0; printf("%d",c-1); to test the char type, finding that the char type ranges from 0 to 255, as an unsigned short . but the EOF defined in stdio.h is (-1). So is the wrong cc package installed on my Pi? how can I fix it? If I changed the EOF value in stdio.h manually, will there be further problems? what worries me is that ,when I learning from the K&R book, there

问题 In C, I can read an input and stop the program when it reaches the end of file ( EOF ). Like so. #include <stdio.h> int main(void) { int a; while (scanf("%d", &a) != EOF) printf("%d\n", a); return 0; } How can I do that in Lua? 回答1: The Lua Documentation features a ton of details on file-reading and other IO. For reading an entire file: t = io.read("*all") apparently reads an entire file. The documentation has examples on reading line-by-line etc. Hope this helps. Example on reading all lines

问题 I've made a code to read a binary file as follows : file=open('myfile.chn','rb') i=0 for x in file: i=i+1 print(x) file.close() and the result as follows (a part of it) : b'\x00\x00\x80?\x00\x00\x00\x005.xx\x00S\xd4\n' How can i detect the EOF of this binary file? Let say i want to print() after i find the EOF. I tried this, but nothing happened. if (x=='\n'): print() (updated) @aix: let say that the file have few lines of results,just like the example, each line has '\n' at the end and i

问题 In a client-server program, need check EOF for read() on a FIFO ? Questions: Does EOF in FIFO return 0 , or -1 with errno set? Does the rule also apply to other IPC facilities? @Update I still found the result wield, so need to continue ask about it. Following are the source code: cs_fifo.h: // fifo header #ifndef _CS_FIFO #define _CS_FIFO #define CLIENT_DATA_SIZE 2 #define SERVER_DATA_SIZE 10 #define SERVER_FIFO_PATH "/tmp/server_fifo" #define CLIENT_COUNT 3 #endif fifo_server.c: // client -

问题 This question already has answers here : C : How to simulate an EOF? (5 answers) Closed 3 years ago . My Visual Studio still awaits input even after I keep entering a newline. For example: while ((c = fgetc(stdin)) != EOF) { // do something } What should I enter that sends EOF to Visual Studio? 回答1: You can send an EOF with CTRL + D (for Linux) or CTRL + Z (for Windows) systems. To elaborate, when fgetc() is waiting for an input from empty stdin , this key combination will simulate the EOF .

问题 For below question, Write a program to read English text to end-of-data (type control-D to indicate end of data at a terminal, see below for detecting it), and print a count of word lengths, i.e. the total number of words of length 1 which occurred, the number of length 2, and so on. Define a word to be a sequence of alphabetic characters. You should allow for word lengths up to 25 letters. Typical output should be like this: length 1 : 10 occurrences length 2 : 19 occurrences length 3 : 127

问题 My servlet reads from a binary file using the FileInputStream.read(). This returns -1 if end of file is reached. It then sends the bytes of the file to the client over the response stream. I want to then send the bytes of a md5 hash of the file over the response stream. How should i split the end of file from the md5 of the file so that the client knows which bytes are which? I can't send a -1 byte because then the stream stops working. Are there any other bytes i can send to signal end of

问题 So I started to learn C using the ANSI C book. One of the early exercises in the book is to write a program that takes text input and prints every word on a new line, simple enough. So i did: #include <stdio.h> #define IN 1 #define OUT 0 main() { int c; int state; state = OUT; while((c = getchar()) != EOF){ if(c != ' ' && c != '\n' && c != '\t'){ state = IN; }else if(state == IN){ state = OUT; putchar('\n'); } if(state == IN) putchar(c); } getchar(); } The thing is that while the program

问题 Consider the code below: #include<stdio.h> int main(){ char c; while( ( c=getchar() ) != EOF ) printf("%c\n",c); return 0; } I gave the input as: hi^Z The output was: h i (an arrow pointing towards left) [Sorry, I couldn't find character for the above arrow. ] Can someone please explain the output ? Since ^Z is part of the character string and there are characters to flush, I think ^Z shouldn't have been passed and thus the output should be, h i (new line ) P.S - I am on windows and ^Z thus