linux ubuntu下使用io.h下的获取文件路径报错解决方法

1、报错描述

（1）代码

#include <io.h>
#include <iostream>
#include <fstream>
#include <string>
#include <vector>


using namespace std;
void getAllFiles(string path, vector<string>&files, string fileType)
{
    //文件句柄
    long hFile = 0;
    struct _finddata_t fileInfo;
    string p;

    if ((hFile = _findfirst(p.assign(path).append("\\*" + fileType).c_str(), &fileInfo)) != -1){
        do{
            files.push_back(p.assign(path).append("\\").append(fileInfo.name));
        } while (_findnext(hFile, &fileInfo) == 0);

        _findclose(hFile);//关闭句柄
    }
}

int main(int argc)
{
    cout<<"308"<<endl;
    vector<string> temp;
    getAllFiles("\\mnt\\data2\\xuqiong\\image\\meiqi\\trunk\\testbd\\path", temp, ".jpg");

    for (int i = 0; i < temp.size(); i++){
        cout << temp[i] << endl;
    }
    
    return 0;
}

（2）报错内容：

/mnt/data2/xuqiong/image/meiqi/trunk/testbd/test_image.cpp: In function ‘void getAllFiles(std::__cxx11::string, std::vector<std::__cxx11::basic_string<char> >&, std::__cxx11::string)’:

/mnt/data2/xuqiong/image/meiqi/trunk/testbd/test_image.cpp:82:24: error: aggregate ‘getAllFiles(std::__cxx11::string, std::vector<std::__cxx11::basic_string<char> >&, std::__cxx11::string)::_finddata_t fileInfo’ has incomplete type and cannot be defined

     struct _finddata_t fileInfo;

/mnt/data2/xuqiong/image/meiqi/trunk/testbd/test_image.cpp:85:87: error: ‘_findfirst’ was not declared in this scope

     if ((hFile = _findfirst(p.assign(path).append("\\*" + fileType).c_str(), &fileInfo)) != -1){

/mnt/data2/xuqiong/image/meiqi/trunk/testbd/test_image.cpp:88:44: error: ‘_findnext’ was not declared in this scope

         } while (_findnext(hFile, &fileInfo) == 0);

/mnt/data2/xuqiong/image/meiqi/trunk/testbd/test_image.cpp:90:25: error: ‘_findclose’ was not declared in this scope

         _findclose(hFile);//关闭句柄

（3）分析

io.h 头文件可能不兼容跨平台操作。在windows下这个头文件运行稳定，但是在linux下这个头文件不能正常运行。

参考：https://www.cnblogs.com/gdut-gordon/p/9678175.html

2、解决方法

//头文件
#include <iostream>
#include <sys/types.h>
#include <dirent.h>
#include <vector>
#include <string.h>
 
using namespace std;
 
 
void GetFileNames(string path,vector<string>& filenames)
{
    DIR *pDir;
    struct dirent* ptr;
    if(!(pDir = opendir(path.c_str())))
        return;
    while((ptr = readdir(pDir))!=0) {
        if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0)
            filenames.push_back(path + "/" + ptr->d_name);
    }
    closedir(pDir);
}
 
int main() {
    vector<string> file_name;
    string path = "/home/image";
 
    GetFileNames(path, file_name);
 
    for(int i = 0; i <file_name.size(); i++)
    {
        cout<<file_name[i]<<endl;
    }
 
    return 0;
}

参考：https://blog.csdn.net/lsq2902101015/article/details/51373911