C语言CSV列搜索程序报错求助：非类类型成员访问错误

问题概述 #

需要开发一个C语言程序读取CSV文件，接受列名和关键词两个输入，在指定列中查找包含关键词的行并输出整行。当前程序在第75行报错：

'request for member 'Location1' in 'aol', which is of non-class type 'data [4000]''

错误原因分析 #

• 数组访问错误：aol是struct data类型的数组，不能直接通过aol.Location1访问成员，必须通过数组下标（如aol[i].Location1）定位到单个结构体元素后再访问成员。
• 字符串比较错误：C语言中字符串不能用==直接比较，必须使用strcmp函数判断是否相等。
• 循环逻辑错误：for循环中i+8不会改变循环变量i的值，会导致死循环；同时硬编码3940不符合动态数据量的需求，应使用全局变量printedlines。
• 搜索逻辑偏差：原代码混淆了列名（column）和关键词（choice）的判断逻辑，应该根据用户输入的column指定搜索列，再用choice匹配关键词。

代码修正要点 #

1. 替换字符串比较方式：用strcmp(column, "列名") == 0判断用户选择的列
2. 修正数组访问方式：通过aol[i].成员名访问数组中结构体的成员
3. 修复循环逻辑：将i+8改为i++，用printedlines作为循环上限
4. 实现按列搜索：针对不同列，调用strstr检查对应字段是否包含关键词，匹配则输出整行

修正后的完整代码 #

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

struct data{
    char Location1[100];
    char Location2[100];
    char price[10];
    char rooms[10];
    char bathrooms[10];
    char carparks[10];
    char type[100];
    char furnish[100];
};

struct data aol[4000];
int printedlines;

// 读取CSV文件内容
void fileread() {
    FILE *fp = fopen("AOLDATA.csv","r");
    if(fp == NULL){
        printf("Error! File not found.");
        exit(0);
    }
    // 跳过表头行
    char header[500];
    fgets(header, sizeof(header), fp);
    
    while(fscanf(fp, "%[^,],%[^,],%[^,],%[^,],%[^,],%[^,],%[^,],%[^\n]", 
        aol[printedlines].Location1, aol[printedlines].Location2,
        aol[printedlines].price, aol[printedlines].rooms, 
        aol[printedlines].bathrooms, aol[printedlines].carparks,
        aol[printedlines].type, aol[printedlines].furnish) != EOF) {
        printedlines++;
    }
    fclose(fp);
}

// 按指定列搜索关键词
void searchByColumn(char *column, char *keyword) {
    int found = 0;
    for(int i = 0; i < printedlines; i++) {
        int match = 0;
        // 根据选择的列判断是否匹配关键词
        if(strcmp(column, "Location1") == 0) {
            match = strstr(aol[i].Location1, keyword) != NULL;
        } else if(strcmp(column, "Location2") == 0) {
            match = strstr(aol[i].Location2, keyword) != NULL;
        } else if(strcmp(column, "price") == 0) {
            match = strstr(aol[i].price, keyword) != NULL;
        } else if(strcmp(column, "rooms") == 0) {
            match = strstr(aol[i].rooms, keyword) != NULL;
        } else if(strcmp(column, "bathrooms") == 0) {
            match = strstr(aol[i].bathrooms, keyword) != NULL;
        } else if(strcmp(column, "carparks") == 0) {
            match = strstr(aol[i].carparks, keyword) != NULL;
        } else if(strcmp(column, "type") == 0) {
            match = strstr(aol[i].type, keyword) != NULL;
        } else if(strcmp(column, "furnish") == 0) {
            match = strstr(aol[i].furnish, keyword) != NULL;
        } else {
            printf("Invalid column name!\n");
            return;
        }
        
        if(match) {
            printf("%-20s%-20s%-20s%-20s%-20s%-20s%-20s%-20s\n", 
                aol[i].Location1, aol[i].Location2, aol[i].price, aol[i].rooms,
                aol[i].bathrooms, aol[i].carparks, aol[i].type, aol[i].furnish);
            found++;
        }
    }
    if(!found) {
        printf("Data not found!\n");
    }
}

int main(){
    int option;
    fileread();
    
    printf("What do you want to do?\n1.Display data\n2.Search Data\n3.Sort Data\n4.Export Data\n5.Exit\n");
    printf("Your choice: ");
    scanf("%d", &option);
    getchar(); // 清除输入缓冲区的换行符
    
    if(option == 1){
        int howmanylines;
        printf("Number of rows: ");
        scanf("%d", &howmanylines);
        // 限制输出行数不超过实际读取的行数
        if(howmanylines > printedlines) howmanylines = printedlines;
        for(int i = 0; i < howmanylines; i++) {
            printf("%-20s%-20s%-20s%-20s%-20s%-20s%-20s%-20s\n", 
                aol[i].Location1, aol[i].Location2, aol[i].price, aol[i].rooms,
                aol[i].bathrooms, aol[i].carparks, aol[i].type, aol[i].furnish);
        }
    }else if(option == 2){
        char column[100];
        char keyword[100];
        
        printf("Choose column: ");
        fgets(column, sizeof(column), stdin);
        column[strcspn(column, "\n")] = '\0'; // 去掉换行符
        
        printf("What do you want to find? ");
        fgets(keyword, sizeof(keyword), stdin);
        keyword[strcspn(keyword, "\n")] = '\0';
        
        searchByColumn(column, keyword);
    }
    
    return 0;
}

补充说明 #

• 新增searchByColumn函数专门处理按列搜索逻辑，代码更清晰
• 读取CSV时跳过表头行，避免表头被当作数据处理
• 用fgets替代scanf读取字符串，避免空格截断问题
• 限制输出行数不超过实际读取的行数，防止数组越界

输入文件示例（AOLDATA.csv） #

Location1,Location2,price,rooms,bathrooms,carparks,type,furnish
NY,US,10,20,30,40,Bad,Expensive
LN,UK,20,30,40,50,Good,Expensive
JK,IN,20,10,50,20,Good,Cheap

内容的提问来源于stack exchange，提问作者Pluto