fgets和sscanf将文件读入数组

Question

I am trying to implement a function that reads txt files that contain 2 double and int per line with a space as a delimiter, for example (data.txt):

3.1 2.5 1

3.4 4.5 2

.....

I implemented the function below, it takes as arguments the file name, pointers to 2 double and an int. Each pointer will be used to retrieve a column from the file. I used fgets to get the line and then sscanf to extract the three values from the line. The program crushes at run time (error: Windows has triggered a breakpont in program.exe )

... When I put a breaking point before returning from the main function the retrieved values are corrected but the program crushes when I hit continue.

To debug the function I added the following lines of code to the function ReadFile below:

if (buf[strlen(buf)-1] != '\0') 
{ 
    putchar(buf[strlen(buf)-1]); //surprisingly this line prints 1 instead of a space... 
    exit(1);
}

With this change the code exit without reaching the end of the function. I don't understand this because the buf variable is long enough to hold all the characters of one line from the sample file.

I would appreciate your comments to fix this problem.

Thank you.

bool ReadFile(const char* fileName, double* x, double* y, int* t, int size)
{
    FILE* fp;   
    char    buf[5000];
    fp = fopen( fileName, "r" );

    for( int i = 0; i < size && fgets(buf, 5000, fp) != NULL; i++)  
    {
        buf[strlen(buf)-1] = '\0'; 
        if (buf[strlen(buf)-2] != '\0') 
        {    
            putchar(buf[strlen(buf)-1]);//surprisingly this line prints 1 instead of a space...
            exit(1);       
        }

        sscanf(buf, "%lf %lf %d", &x[i], &y[i], &t[i]);


    }

    fclose(fp);
    return true;
}

Answer 1

问题出在调用者中，大小设置为1，而不是数据文件中的行数。