FileWatcher

FileWatcher is simple file/dir change detection that based c++17.

This can easily detect the creation/deletion/modification of files/folders.

Feature

• File & Directory change detection (Directory only support inner file create/remove -> Modified status for dir)
• Cross platform.
• Thread safe.
• Support 3 File status. -> Created, Modified, Erased
• Support relative/absolute path.
• Very easy to use & simple.

How to use

1. Include "FileWatcher.h"
2. Create FileWatcher object(watcher::FileWatchar fileWatchar)
3. Register file path with each path callback(Callback is not essential. You can use global callback)
4. Call FileWatcher's start function
5. Even after you call the "start" function, you can register.

Sample code

#include <iostream>
#include <chrono>
#include <fstream>

#include "FileWatcher.h"

using namespace std::chrono_literals;

void callback(std::filesystem::path path, watcher::FileStatus status) {
	switch (status)
	{
	case watcher::FileStatus::Created:
		std::cout << path.string() << " Created!" << std::endl;
		break;
	case watcher::FileStatus::Modified:
		std::cout << path.string() << " Modified!" << std::endl;
		break;
	case watcher::FileStatus::Erased:
		std::cout << path.string() << " Erased!" << std::endl;
		break;
	default:
		std::cout << "error!" << std::endl;
		break;
	}
}

void eachCallback(std::filesystem::path path, watcher::FileStatus status) {
	std::cout << "each callback ";
	switch (status)
	{
	case watcher::FileStatus::Created:
		std::cout << path.string() << " Created!" << std::endl;
		break;
	case watcher::FileStatus::Modified:
		std::cout << path.string() << " Modified!" << std::endl;
		break;
	case watcher::FileStatus::Erased:
		std::cout << path.string() << " Erased!" << std::endl;
		break;
	default:
		std::cout << "error!" << std::endl;
		break;
	}
}

void writeData(std::filesystem::path path) {
	std::filesystem::create_directories(path.parent_path());
	std::ofstream ofs(path, std::ios::app);
	ofs.close();

	std::this_thread::sleep_for(2s);

	std::ofstream ofs2(path, std::ios::app);
	ofs2 << "this is some text in the new file\n";
	ofs2.close();
}

int main() {
	watcher::FileWatchar fileWatchar;

	std::filesystem::path temp("C:/Users/CYS/Downloads/temp.txt"), temp1("C:/Users/CYS/Downloads/temp1.txt"), temp2("C:/Users/CYS/Downloads/temp2.txt");

	std::filesystem::remove_all(temp);
	std::filesystem::remove_all(temp1);
	std::filesystem::remove_all(temp2);	

	// EX) Create file & write data
	writeData(temp1);

	// Add path that want to chage(Created, Modified, Erased)
	// Support watching that not created file.
	fileWatchar.addPath(temp1);

	// Support each callback
	fileWatchar.addPath(temp2, eachCallback);
	fileWatchar.addPath("../FileWatcher/Main.cpp");//x86 // It's ok to write string & relative path
	fileWatchar.addPath("../../FileWatcher/Main.cpp");//x64 // It's ok to write string & relative path

	fileWatchar.start(callback); // Global Callback

	// EX) Create file & write data
	writeData(temp2);

	std::this_thread::sleep_for(5s);
	fileWatchar.addPath(temp);
	writeData(temp);
	std::this_thread::sleep_for(5s);
	fileWatchar.removePath(temp);
	writeData(temp); // not watching

	std::filesystem::remove_all(temp);
	std::filesystem::remove_all(temp1);
	std::filesystem::remove_all(temp2);

	//fileWatchar.stop(); // not essential

	std::this_thread::sleep_for(1000s); // Do something
}

sample image