C-将txt读入txt文件 [英] C-Read txt into txt file

问题描述

我在目录"/user/doc"中有一个txt文档test.txt，如下所示:

I have a txt document test.txt in directory "/user/doc" like this:

10 21 34 45 29 38 28
29 47 28 32 31 29 20 12 24

*两行数字用空格"分隔.

*Two lines of numbers separated by "space".

我想将数字写入具有灵活长度的2行数组中.长度可能取决于txt文档的一行中更多数字的数量.在示例中，该值应为9.

I want to write the numbers into a 2-row array, with flexible length. The length may depends on the amount of more numbers in one line of the txt document. In the example it should be 9.

然后，该数组可能如下所示:

And after that the array may look like:

10 21 34 45 29 38 28 0 0
29 47 28 32 31 29 20 12 24

第1行中的数字在数组的第1行中.第2行中的数字位于数组的第2行中.

Numbers in line-1 are in row-1 in the array. And numbers in line-2 are in row-2 in the array.

我得到了下面的代码来一个接一个地填充数组，但是我不知道如何将其修改为所需的内容.有人可以帮忙吗?谢谢！

I got the code below to fill the array one by one but I don't know how to modify it to what I need. Can anybody help? Thanks!

FILE *fp;
int key1[2][10];

if((fp = fopen("/Users/doc/test.txt", "rt")) == NULL)
{
    printf("\nCannot open file");
    exit(1);
}

else
{
    while(!feof(fp))
    {
        for(int i = 0; i < 2; i++)
        { 
            for(int j = 0; j < 10 ;j++)
            {
                fscanf(fp, "%d", &key1[i][j]); 
            }
        }

    }
}

fclose(fp);

推荐答案

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

int getColCount(FILE *fin){
    long fpos = ftell(fin);
    int count = 0;
    char buff[BUFSIZ];
    while(fgets(buff, sizeof(buff), fin)){
        char *p;
        for(p=strtok(buff, " \t\n");p;p=strtok(NULL, " \t\n"))
            ++count;
        if(count)break;
    }
    fseek(fin, fpos, SEEK_SET);
    return count;
}

int main(void){
    FILE *fp;
    int *key1[2];

    if((fp = fopen("/Users/doc/test.txt", "rt")) == NULL){
        printf("\nCannot open file");
        exit(1);
    }

    for(int i = 0; i < 2; ++i){
        int size = getColCount(fp);
        key1[i] = malloc((size+1)*sizeof(int));
        if(key1[i]){
            key1[i][0] = size;//length store top of row
        } else {
            fprintf(stderr, "It was not possible to secure the memory.\n");
            exit(2);
        }
        for(int j = 1; j <= size ;++j){
            fscanf(fp, "%d", &key1[i][j]); 
        }
    }
    fclose(fp);
    {//check print and dealocate
        for(int i = 0; i < 2 ; ++i){
            for(int j = 1; j <= key1[i][0]; ++j)
                printf("%d ", key1[i][j]);
            printf("\n");
            free(key1[i]);
        }
    }
    return 0;
}

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