c - 我如何忽略 c 中 .txt 文件中的换行符

Question

我正在从一个文本文件中读取并将每个元素存储到一个链表中。但是，当程序到达返回字符或换行符时，程序会返回错误。

从文本文件中读取并存储到结构中。当我将每个结构打印到屏幕上时，我注意到错误，程序在返回字符之前打印最后一个结构，然后退出。

int main(int argc, const char * argv[]) {
    printf("Hello!\n");

    char filename[] = "artist.txt";

    print_artists(read_artists(filename));

    return 0;
}

    struct artist *read_artists(char *fname)
    {
        int maxlen = 225;

        int artid = 0;
        int altartid = 0;
        int pc = 0;
        char artname[80];

        char data[maxlen];
        int valid = 0; // 0 acts as true 1 acts as false
        int checkresult = 0; //checks result of sscanf

        struct artist *temphead = create_artist(0,0,0,"0");

        FILE *fp = fopen(fname ,"r");

        if (fp != NULL)
        {
            while (fgets(data,maxlen,fp))
            {
                checkresult = sscanf(data,"%d\t%[^\t\n]\n",&artid,artname);
                if (checkresult == 2)
                {
                    struct artist *b = NULL;
                    b = create_artist(artid,altartid,pc,artname);
                    temphead = add_artist(temphead,b);
                }
                else
                {
                    printf("error checkresult = %d\n",checkresult);
                    printf("break out of loop valid = 1\n");
                    valid = 1; // acts as boolean variable
                    break; //breaks out of the while(fgets)
                }
            }
            fclose(fp);
            return (temphead);
        }
        else
        {
            fclose(fp);
            printf("File Error\n");
            return (NULL);
        }

    }

void print_artists(struct artist *head)
{
    if (head != NULL)
    {
        struct artist *temp = head;
        while (temp -> next != NULL)
        {
            print_artist(temp);
            temp = temp -> next;
        }
        print_artist(temp);
    }
}

这是输出

我正在阅读的文本文件

Answer 1

当您到达 Bodenstandig 之前的空白行时，sscanf 将不匹配，您将在“break”处退出 while 循环。

如果 sscanf 没有返回 2，您应该检查该行是否为空，如果是，则跳过并阅读下一行。或者只是跳过检查并忽略坏行。 while(fgets(...) 条件将在文件末尾变为假，因此您不需要在错误行上退出。

if (checkresult == 2)
{
    ....
}
else
{
    continue; // will go back to top while(fgets(...))
}