卡在使用dirent.h查找子文件夹C++中的所有文件

Stuck using dirent.h to find all files in subfolders C++

本文关键字：C++ 文件 文件夹 dirent 查找      更新时间：2023-10-16

我目前一直在使用dirent.h扩展。目标是为函数提供一个启动的路径目录。然后，该函数将查找该目录中的所有子文件夹并在其中找到文件。直到同一目录中有两个文件夹为止，它都能工作。然后程序固执地选择一个文件夹而忽略另一个。这是我混乱的代码。(该问题在代码底部进行了评论(

#include <iostream>
#include "dirent.h"
#include <windows.h>
DWORD getPathType(const char *path); //checks if path leads to folder or file
const char *dirlist[20];  //contains all directories (not files, only dir's)
int dirAm = 0;            //specifies amount of directories
void loadTextures(const char *loaddir) {
dirlist[dirAm] = loaddir;  //specifies starting directory
dirAm++;
for(int i = 0; i<20; i++) {
DIR *dir;
struct dirent *ent;
const char *currentdir = dirlist[i];  //stores current directory
dir = opendir(currentdir);            //opens current directory
if (dir != NULL) {
std::cout << "[OPENING dir]t" << currentdir << std::endl;
while ((ent = readdir(dir)) != NULL) {
const char *filename;  //stores current file/folder name
char fullDirName[100]; //stores full path name (current dir+file name, for example /images/+image1.png)
DWORD filetype;        //checking path type (file/folder)
filename = ent->d_name; //gets current file name
strcpy(fullDirName, currentdir); //concats current directory and file name to get full path, for example /images/image1.png
strcat(fullDirName, filename);
filetype = getPathType(fullDirName); //gets path type
if (filetype == FILE_ATTRIBUTE_DIRECTORY) {
//if its a directory add it to the list of directories, dirlist, the naming process is the same as above
const char *filenameIn;
char fullDirNameIn[100];
filenameIn = ent->d_name;
strcpy(fullDirNameIn, currentdir);
strcat(fullDirNameIn, filenameIn);
strcat(fullDirNameIn, "/");
std::cout << "[FOUND dir]t" << fullDirNameIn<<std::endl;
dirlist[dirAm] = fullDirNameIn;
dirAm++;
/* Here is the problem! The cout line above finds all
folders in a directory and saves them in the array, but as soon as the new for
loop iteration starts, the values in the dirlist array... change? And I have no
idea what is going on */
} else {
std::cout << "[FOUND file]t" << fullDirName << std::endl;
}
}
}
}

这里是getPathType((函数。我想很直接。

DWORD getPathType(const char *path) {
DWORD fileat;
fileat = GetFileAttributesA(path);
return fileat;
}

最后，这里是控制台输出：

[OPENING dir]   img/                 <- opens starting dir
[FOUND dir]     img/lvl0/            <- finds lvl0, should store it in dirlist
[FOUND dir]     img/lvl1/            <- finds lvl1
[OPENING dir]   img/lvl1/
[FOUND file]    img/lvl1/player2.png
[OPENING dir]   img/lvl1/            <- only opens lvl1
[FOUND file]    img/lvl1/player2.png

我知道这是一个很大的问题，但如果有人能分享这方面的想法，我将不胜感激。

您忽略了char数组的作用域。实际上你在做这个

const char *dirlist[20];
while (...)
{
char fullDirNameIn[100];
....
dirlist[dirAm] = fullDirNameIn;
}

问题是，您的数组的作用域是while循环的主体，但您将指向该数组的指针存储在while循环之外。退出循环主体后(即迭代时(，数组的内容将变得未定义，但您仍然有一个指向它的指针。

解决方案很简单，这应该是一个很好的教训不要使用指针，要像有经验的程序员那样使用std::string。

std::string dirlist[20];
while (...)
{
std::string fullDirNameIn;
....
dirlist[dirAm] = fullDirNameIn;
}
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