从文件夹中读取所有.txt文件？

我正在尝试读取名为“数据集”的目录中的所有.txt文件。所有文本文件的名称都类似于1.txt，2.txt，3.txt ...，然后将文件内容保存到名为FILES的结构中。

在某些资料中，我使用了dirent.h库和readdir（）函数。但是程序从目录读取的文件名未正确返回。这是我的相关代码：

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

typedef struct FILES{
    char **words;
    int wordCount;
}FILES;

void readFiles();

FILES *files;
int fileCount;

int main(){
    readFiles();

    return 0;
}

void readFiles(){
    FILE *file;
    DIR *directory;
    struct dirent *filesInDirectory;
    int counter;

    fileCount = 1;
    files = (FILES *)malloc(sizeof(FILES));
    directory = opendir("dataset");
    if(directory == NULL){
        printf("Warning: The directory name that is given in the code is not 
valid ..!");
        return;
    }else{
        while((filesInDirectory = readdir(directory)) != NULL){
            printf("%s\n", filesInDirectory->d_name);
            file = fopen(filesInDirectory->d_name, "r+");
            if(file == NULL){
                printf("Warning: The file named %s could not open ..!", 
filesInDirectory->d_name);
                return;
            }
            files[fileCount-1].wordCount = 1;
            files[fileCount-1].words = (char **)malloc(files[fileCount-
1].wordCount * sizeof(char *));
            counter = 0;

            while(!feof(file)){
                files[fileCount-1].words[counter] = (char *)malloc(20 * 
sizeof(char));
                fscanf(file, "%s", files[fileCount-1].words[counter]);
                files[fileCount-1].wordCount++;
                files[fileCount-1].words = (char **)realloc(files[fileCount-
1].words, files[fileCount-1].wordCount * sizeof(char *));
                counter++;
            }
            fileCount++;            
            fclose(file);
        }
    }

}

我在此处打印的文件名“ printf（“％s \ n”，filesInDirectory-> d_name）;” 是“。”。我在哪里做错了？