将文件读取到C中的二维数组 [英] Read a file to a 2D array in C

问题描述

我正在学习C语言，并且决定把文本游戏作为我的学习项目。所以我正在尝试这个原始的解析器，它将文本文件读取到二维数组中，但有一个问题：该映射不使用1个字符的单元格，而是使用2个字符的单元格。例如，玩家用 ** 表示，门表示为 ## 等等。 / b>

这意味着，我需要读取文本文件的2个字符，然后将其分配给映射中的相应单元。

$ b $我做了一个测试文件，其中包含

  aabbccddee 
 ffgghhiijj 
 kkllmmnnoo 
 ppqqrrsstt 
 uuvvwwxxyy 
  

我试着用

  #include< stdio.h> 
 
 #define ROWS 5 
 #define COLS 5 
 
 int main（）{
 FILE * mapfile = fopen（durr，r ）; 
 char charbuffer [3]，row，col，* map [ROWS] [COLS]; （行= 0;行 for（col = 0; col< COLS; col ++）{}的初始化数组* / 
 {
 
 
 map [row] [col] =; （行= 0;行 for（
）
 / *将文件读入数组* / 
 col = 0; col< COLS; col ++）{
 map [row] [col] = fgets（charbuffer，3，mapfile）; （行= 0;行 for（col = $; 
 
）
 
 / *打印数组* / 
 0; col< COLS; col ++）{
 printf（％s，map [row] [col]）; 
} 
 printf（\\\
）; 
} 
 
 fclose（mapfile）; 
返回0; 
} 
  

但是当我执行它时，我得到这个

  uuuuuuuuuu 
uuuuuuuuuu 
uuuuuuuuuu 
uuuuuuuuuu 
uuuuuuuuuu 
  

我认为这与fgets返回一个指针有关，但我不确定。我试着用fgetc来做，但是看起来很乱，我在阅读了get之后就放弃了它。

从文件中读取的内容。用这个替换文件读取块：

  / *将文件读入数组* / 
 for（row = 0; （col = 0; col  if（fgets（charbuffer，3，mapfile））
 map [row] row（row; row ++）{
 col] = strdup（charbuffer）; 
 
 
 code 
 $ b 
不要忘记把它放在开头 
 
 
  #include< string.h> 
  
 
I'm learning C and I decided to make a text game as my learning project. So I'm trying this primitive "parser" that reads a text file into a 2D array, but there's a problem: this map doesn't use 1 character-wide cells, it uses 2 character-wide cells. For instance, the player is represented with a **, a door is represented like ## and so on.


That means, I need to read 2 characters of the text file and then assign it to the respective cell in the map.

Well, I made a test file that contains
aabbccddee
ffgghhiijj
kkllmmnnoo
ppqqrrsstt
uuvvwwxxyy
And I tried to read it with
#include <stdio.h>

#define ROWS 5 
#define COLS 5

int main() {
    FILE *mapfile = fopen("durr", "r");
    char charbuffer[3], row, col, *map[ROWS][COLS];

    /* Initializing array */
    for (row = 0; row < ROWS; row++) {
        for (col = 0; col < COLS; col++) {
            map[row][col] = "  ";
        }
    }

    /* Reading file into array */
    for (row = 0; row < ROWS; row++) {
        for (col = 0; col < COLS; col++) {
            map[row][col] = fgets(charbuffer, 3, mapfile);
        }
    }

    /* Printing array */
    for (row = 0; row < ROWS; row++) {
        for (col = 0; col < COLS; col++) {
            printf("%s", map[row][col]);
        }
        printf("\n");
    }

    fclose(mapfile);    
    return 0;
}
But when I execute it, I get this
uuuuuuuuuu
uuuuuuuuuu
uuuuuuuuuu
uuuuuuuuuu
uuuuuuuuuu
I think it has something to do with the fact that fgets return a pointer, but I'm not sure. I tried doing it with fgetc but it looks messy and I dropped it after reading about gets.
解决方案
You should have strdup'ed the contents read from the file.  Replace the file reading block with this:
/* Reading file into array */
for (row = 0; row < ROWS; row++) {
    for (col = 0; col < COLS; col++) {
        if (fgets(charbuffer, 3, mapfile))
            map[row][col] = strdup(charbuffer);
    }
}
and don't forget to put this at the beginning of your code too:
#include <string.h>


                        
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