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Socoder -> Off Topic -> ReadDir for C |
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| Sat, 06 Jan 2018, 19:44 | |
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jm2bits |
C++ doesn't have a ’’Dir’’/Folder List function!? There is Dirent - which is a POSIX thing (so will work on anything not windows) and a Windows compatibility here: Linkage |
| Sat, 06 Jan 2018, 19:44 | |
steve_ancell
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There are ways, but it's all arse about tit. www.dummies.com/programming/cpp/how-to-get-the-contents-of-a-directory-in-c/
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| Sun, 07 Jan 2018, 04:18 | |
Jayenkai
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I’m sure there's 100 ways to "add it", I was just moaning that, even though it can seemingly pull off 100,000 File Access methods itself, reading a directory isn’t one of them, so it's a pain in the arse to actually GET to the files in the first place. Whoever decided that was a good idea, deserves a swift kick up the backside. -=-=- ''Load, Next List!'' 
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| Sun, 07 Jan 2018, 04:50 | |
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jm2bits |
From: https://stackoverflow.com/questions/9886233/how-to-get-a-list-of-files-using-only-the-c-standard-library/9886902#9886902 "There is no portable way to list all the files in a specified directory using only the C Standard library. Functions like readdir are part of POSIX but not part of the C Standard library. You have to remember that not all operating systems have a concept of directory. An example is the MVS OS on IBM System/360 and System/370 where "." was used in file names to represents a directory hierarchy." POSIX is not something you add, it is a standard which most OS's support (but not windows - hence the header file I linked to). So #including dirent.h (as you would stdio.h for fopen) would allow you to enumerate a directory with the code below. DIR *dir; struct dirent *ent; if ((dir = opendir ("c:\\src\\")) != NULL) { /* print all the files and directories within directory */ while ((ent = readdir (dir)) != NULL) { printf ("%s\n", ent->d_name); } closedir (dir); } else { /* could not open directory */ perror (""); return EXIT_FAILURE; } Which is pretty simple? I implemented all of our filesystem handling code at work using that and it works on Windows/Linux/Mac/Android/iOS. Also, if you are using C++17 - then that has a cross platform Filesystem library as part of the standard. https://en.cppreference.com/w/cpp/experimental/fs Which would allow you to do this: #include <string> #include <iostream> #include <filesystem> namespace fs = std::filesystem; int main() { std::string path = "path_to_directory"; for (auto & p : fs::directory_iterator(path)) std::cout << p << std::endl; } But I wouldn't rely on that becoming generally available/stable for a while. |
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