Check all files sizes in a path (C++) - c++

Question

I'm trying to loop so that my program can get the weight of all files in a folder, and if the weight of any of these is equal to X, it will do an action, I need to know how I can loop like this, and i have a func to know whats the file size
std::ifstream::pos_type filesize(const char* filename)
{
std::ifstream in(filename, std::ifstream::ate | std::ifstream::binary);
return in.tellg();
}

Answer 1

Here's a short example program that demonstrates how to use C++17's <filesystem> library to iterate over a directory. If your compiler is fairly up-to-date, it should support C++17 without issue.
#include <filesystem>
#include <iostream>
int main() {
namespace fs = std::filesystem;
fs::path pwd(""); // Current directory program was executed from
pwd = fs::absolute(pwd);
for (auto& i : fs::directory_iterator(pwd)) {
try {
if (fs::file_size(i.path()) / 1024 > 2048) {
std::cout << i.path() << " is larger than 2MB\n";
}
} catch (fs::filesystem_error& e) {
std::cerr << e.what() << '\n';
}
}
}
This was the contents of the directory:
.
├── a.out
├── fiveKB
├── fourMB
├── main.cpp
└── oneMB
0 directories, 5 files
And information about the files:
drwxr-xr-x 7 user staff 224B Jul 29 22:11 ./
drwxr-xr-x 13 user staff 416B Jul 29 21:59 ../
-rwxr-xr-x 1 user staff 47K Jul 29 22:10 a.out*
-rw-r--r-- 1 user staff 5.0K Jul 29 21:58 fiveKB
-rw-r--r-- 1 user staff 4.0M Jul 29 21:59 fourMB
-rw-r--r-- 1 user staff 450B Jul 29 22:11 main.cpp
-rw-r--r-- 1 user staff 1.0M Jul 29 21:59 oneMB
And finally, the output:
"/Users/user/Documents/tmp/test/fourMB" is larger than 2MB