想实现的功能是从txt文件中读取1000个数据到data数组中，用scanf函数VS软件会报安全性不高 建议用sscanf_s，因此猜测23行调用sscanf_s有问题，那么怎么修改来实现这个功能呢？

Question

#define MAX_SIZE 1000
double data[MAX_SIZE];
int count = 1;                    
FILE* fp;
fp = fopen("D:\\Code01\\Project2\\Project2\\data.txt", "r");
    if (fp == NULL) {
        printf("无法打开文件\n");
        //exit(0);
        return 1;
    }
fseek(fp, 0, SEEK_END);  //指向文件尾， 0指后移0个字节
long buffer_size = ftell(fp);
fseek(fp, 0, SEEK_SET); // 必需把文件指针再指到文件头，不然肯定读不出东西了
// 动态分配缓冲区内存
char* buffer = (char*)malloc(buffer_size * sizeof(char));
if (buffer == NULL) {
    printf("缓存分配失败\n");
    fclose(fp);
    return 1;
}
 while (count < MAX_SIZE && !feof(fp)) {  
    if (fgets(buffer, buffer_size, fp) != NULL) {    
        if (sscanf_s(buffer, "%lf", &data[count]) == 1) { 
            count++; 
            for (int i = 0; i < buffer_size; i++) {
                printf("%c", buffer[i]); 
            }
        }
        else {
            printf("读取失败\n");
        }
        // 根据需要调整buffer_size以适应读取的行长度 
        buffer_size = (long)strlen(buffer) + 1;  // 增加1是为了包含换行符，来跳过已读的数据和空格
    }
    else {
        printf("读取失败\n");
    }
                //打印data
    int length_data = sizeof(data) / sizeof(data[0]);  
    for (int i = 0; i < length_data; i++) {
        printf("%lf", data[i]);
    }
// 释放动态分配的内存
free(buffer);
 
if (fp == NULL) {
 
    fclose(fp);
}

Answer 1

这样写，供参考：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define ARR_SIZE  1800
#define CH_SIZE   32
int main()
{
    double data[ARR_SIZE] = {0};
    int  dig[ARR_SIZE] = { 0 };   //小数位数数组
    int count = 0, n = 0;
    FILE* fp;
    fp = fopen("D:\\data.txt", "r"); //fopen("D:\\Code01\\Project2\\Project2\\data.txt", "r");
    if (!fp) {
        printf("File open fail!\n");
        return 1;
    }
    char* buffer = (char*)malloc(CH_SIZE * sizeof(char));
    memset(buffer, 0, CH_SIZE * sizeof(char));
    while (1) {
        if (fscanf(fp, "%s", buffer) == 1) {
            if (sscanf_s(buffer, "%lf", &data[count], CH_SIZE) == 1) {
                char* ptr = strchr(buffer, 'e');
                if (ptr) { // 如果是科学计数法，小数位计算
                    ptr++;
                    sscanf_s(ptr, "%d", &n);
                    if (*ptr == '-')
                        n += 4;
                    else
                        n += 3;
                }
                else
                    n = 0;
                dig[count] = strlen(buffer) - 2 - n;
                if (dig[count] <= 0)  dig[count] = 1;// 如果是 1 位或 2 位的整数，输出 1 位小数位
                //printf("%.*f\n", dig[count] , data[count]);
                count++;
            }
            memset(buffer, 0, CH_SIZE * sizeof(char));
        }
        else 
            break;
    }
    fclose(fp);
    free(buffer);
    for (int i = 0; i < count; i++) 
        printf("%.*f ", dig[i], data[i]);
    return 0;
}