fgets

PHP fscanf vs fgets

由 ε祈祈猫儿з 提交于 2020-01-02 07:34:49
问题 I am able to read an entire string in a line using fgets() but fscanf() is not doing so. According to PHP manual fscanf — Parses input from a file according to a format The function fscanf() is similar to sscanf() , but it takes its input from a file associated with handle and interprets the input according to the specified format, which is described in the documentation for sprintf() . fgets — Gets line from file pointer Gets a line from file pointer. Since fscanf() supports formats as

file_get_contents with empty file not working PHP

由 僤鯓⒐⒋嵵緔 提交于 2020-01-02 04:47:09
问题 I try to use file_get_contents form PHP but it's not working. There is my code : $filename = "/opt/gemel/test.txt"; if($filecontent = file_get_contents($filename)){ $nom = fgets(STDIN); file_put_contents($filename, $nom, FILE_APPEND); } else echo "fail"; And my file test.txt is empty. (0 octets). He exists but he is empty. When i write something into it, my code works perfectly but if he is empty my code echo "fails" Why that, why he can't open the file text.txt ? 回答1: The function file_get

How to use fgets to read a file line by line

由 淺唱寂寞╮ 提交于 2019-12-31 05:10:19
问题 I'm new at programming so there are some basics and maybe common sense that I don't know. I have a question about how to use fgets right. Based on the explanation of fgets, it seems that fgets should stop whenever it reads n-1 characters, hit the EOF or hit a newline character. For example, I create a text file like below: red 100 yellow 400 blue 300 green 500 purple 1000 ... The color and the integer is separated by a tab. When I create this text file, I need to hit enter at the end of each

how to read a string from a \n delimited file

由 匆匆过客 提交于 2019-12-30 18:39:13
问题 I'm trying to read a return delimited file. full of phrases. I'm trying to put each phrase into a string. The problem is that when I try to read the file with fscanf(file,"%50s\n",string); the string only contains one word. when it bumps with a space it stops reading the string 回答1: fscanf can be modified to read past spaces. The details are a bit complicated. Here is what the man page says about %[...] Matches a nonempty sequence of characters from the specified set of accepted characters;

C read space-separated values from file

由 拥有回忆 提交于 2019-12-30 11:06:32
问题 I need to read text from a file and assign values to a struct based on information read. Here is the format of the text file: First Middle Last Address city state zip age sex tenure salary \-------------------------------------------------------------- ADA A AGUSTA 33 BABBAGE ROAD LOVELACE GB 19569 28 F 2 350.50 ISSAC A ASIMOV 99 FICTION WAY AMHERST MA 63948 58 M 6 423.88 HUMPHRY R BOGART 71 SAM STREET HOLLYWOOD CA 48482 56 M 5 366.00 And the struct I have to read it into: typedef struct {

C read space-separated values from file

由 风格不统一 提交于 2019-12-30 11:06:07
问题 I need to read text from a file and assign values to a struct based on information read. Here is the format of the text file: First Middle Last Address city state zip age sex tenure salary \-------------------------------------------------------------- ADA A AGUSTA 33 BABBAGE ROAD LOVELACE GB 19569 28 F 2 350.50 ISSAC A ASIMOV 99 FICTION WAY AMHERST MA 63948 58 M 6 423.88 HUMPHRY R BOGART 71 SAM STREET HOLLYWOOD CA 48482 56 M 5 366.00 And the struct I have to read it into: typedef struct {

Problem with scanf and fgets

由 我与影子孤独终老i 提交于 2019-12-30 07:20:28
问题 This is for a homework assignment to sort some given strings. I'm prompting the user for the number of strings they'd like to sort with scanf , allocating an array based on that number, and then getting the strings themselves with fgets . Everything works fine if the number of strings is hardcoded, but the addition of scanf to let the user decide screws things up. Here's the code: #include <assert.h> #include <stdio.h> #include <stdlib.h> #define LENGTH 20 // Maximum string length. int main

Read a line of input faster than fgets?

由 梦想与她 提交于 2019-12-30 03:08:27
问题 I'm writing a program where performance is quite important, but not critical. Currently I am reading in text from a FILE* line by line and I use fgets to obtain each line. After using some performance tools, I've found that 20% to 30% of the time my application is running, it is inside fgets . Are there faster ways to get a line of text? My application is single-threaded with no intentions to use multiple threads. Input could be from stdin or from a file. Thanks in advance. 回答1: You don't say

fgets, fputs, ferror, feof, stdin, stdout, EOF, fopen, fclose, fgetc, fputc, getchar, putchar

由 扶醉桌前 提交于 2019-12-29 14:33:25
注意区分gets, fgets, fgetc, getc, getcharputs, fputs, fputc, putc, putchar fgets function<cstdio>char * fgets ( char * str, int num, FILE * stream ); Get string from stream Reads characters from stream and stores them as a C string into str until ( num -1) characters have been read or either a newline or a the End-of-File is reached, whichever comes first. A newline character makes fgets stop reading, but it is considered a valid character and therefore it is included in the string copied to str . A null character is automatically appended in str after the characters read to signal the end of the

Why do I get an assertion failure?

由 ⅰ亾dé卋堺 提交于 2019-12-29 09:19:05
问题 This code fails when I try to debug it using VC2010: char frd[32]="word-list.txt"; FILE *rd=fopen(frd,"r"); if(rd==NULL) { std::cout<<"Coudn't open file\t"<<frd; exit(1); } char readLine[100]; while(fgets(readLine, 100, rd) != NULL) { readLine[strlen(readLine) - 1] = '\0'; char *token = NULL; token = strtok(readLine, " ,"); insert(readLine); } Debugging results in --------------------------- Microsoft Visual C++ Debug Library----------- Debug Assertion Failed! Program: ...\documents\visual
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