Windows下监控文件夹或文件变化

API函数

Windows提供了监控文件夹或文件变化的API， 如下：
FindFirstChangeNotification
FindCloseChangeNotification
FindNextChangeNotification
ReadDirectoryChangesW

具体使用方式，查看msdn或网上找资料
也可参看博文：https://www.cnblogs.com/pjl1119/articles/ReadDirectoryChanges.html

监控文件夹变化（新建、删除、重命名等）例子

#include 
#include 
#include 

int main(int argc, char** argv )
{
	HANDLE hWatchDir = ::FindFirstChangeNotification(_T("F:\\testaaa"),
		TRUE, FILE_NOTIFY_CHANGE_DIR_NAME);
	if (hWatchDir == INVALID_HANDLE_VALUE)
	{
		std::cerr << "invalid watch handle with error " 
			<< ::GetLastError() << std::endl;
		return 1;
	}

	while (TRUE)
	{
		std::cout << "waiting dir changing..." << std::endl;
		if (WAIT_OBJECT_0 == ::WaitForSingleObject(hWatchDir, INFINITE))
		{
			std::cout << "dir or sub dir changed" << std::endl;
		}
		else
		{
			std::cerr << "wait occur error " << ::GetLastError() << std::endl;
			break;
		}

		if (!::FindNextChangeNotification(hWatchDir))
		{
			std::cerr << "find next change failed with error " << ::GetLastError()
				<< std::endl;
			break;
		}
	}

	::FindCloseChangeNotification(hWatchDir);
	hWatchDir = NULL;

	return 0;
}