ファイルから行を読み込む方法は？

Question

#define MAX_READING 100; 

char str_orders[MAX_READING], str_books[MAX_READING], 
    books_updated[MAX_READING], *token, *token1, p[MAX_READING], 
    File * books_orders, *books, books_updated; 

while (fgets (str_orders, MAX_READING, books_orders) != NULL) { 
    if (str_orders[strlen (str_orders) - 1] == '\n') 
     str_orders[(strlen (str_orders) - 1)] = 0; 
    if (strcmp (str_orders, "Initialize") == 0) { 
     while (fgets (str_books, MAX_READING, books) != NULL) { 
      if (str_books[strlen (str_books) - 1] == '\n') 
       str_books[(strlen (str_books) - 1)] = 0; 
      token = strtok (str_books, "$$$"); 
      strcpy (p, token); 
      token = strtok (NULL, "$$$"); 
      copy = atoi (token); 
      add (head, p, copy); 
     } 
    } 
    printf ("%s\n", str_orders); 
    if (strcmp (str_orders, "Initialize") != 0 
     && strcmp (str_orders, "Finalize") != 0) { 
     token1 = strtok (str_orders, "$$$"); 
     strcpy (order, token1); 
     token1 = strtok (NULL, "$$$"); 
     strcpy (book_name, token1); 
     token1 = strtok (NULL, "$$$"); 
     copy = atoi (token1); 
     if (strcmp (order, "Return") == 0) 
      returnbook (head, book_name, copy); 
     if (strcmp (order, "Borrow") == 0) 
      borrowbook (head, book_name, copy); 
     if (strcmp (str_orders, "Finalize") == 0) { 
      while (head != NULL) { 
       fprintf (books_update, "%s", head->name); 
       fprintf (books_update, " $$$ "); 
       fprintf (books_update, "%d", head->copies); 
      } 
     } 
    } 

私は、私はそれらを読むためにfgets機能を使用C. にtxtファイルから行ずつ読みしようとしているが、機能は「Intalize」と呼ばれる最初の行を読み取り、他の行に進みませんファイル内にあります。私はしようとしました

printf("%s",str_orders) 

そしてそれは "Intalize"を返しています。 fgetsは行に進まなかった。

どうすれば修正できますか？

Answer 1

ファイルを1行ずつ読み上げる方法は次のとおりです。

#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 

// Read a line from the file and put it into the buffer, and return 1 if we're at the end of the file 
int readLine(FILE *file, char *buffer, int bufferLength) { 
    int bufferPosition = 0; 

    while (true) { 
     // Copy the character into the buffer 
     buffer[bufferPosition] = fgetc(file); 

     if (feof(file)) { 
      // Return 1 if we're at the end of the file 
      buffer[bufferPosition] = 0; 
      return 1; 
     } else if (buffer[bufferPosition] == '\n') { 
      // Return if we're at the end of a line 
      buffer[bufferPosition] = 0; 
      return 0; 
     } else { 
      // Go to the next character 
      bufferPosition++; 
      if (bufferPosition == bufferLength) { 
       // If we fill up the buffer, exit here 
       buffer[bufferPosition - 1] = 0; 
       break; 
      } 
     } 
    } 

    return 0; 
} 

int main(int argc, char **argv) { 
    FILE *file = fopen("file.txt", "rb"); 

    int lineNumber = 1; 
    char line[4096]; 
    while (true) { 
     int read = readLine(file, line, sizeof(line)); 
     printf("Line %d: %s\n", lineNumber++, line); 
     if (read) break; // The end of the file 
    } 

    fclose(file); 
    return 0; 
}