filewatcher.h

The vc catalogue places procedure code under surveillance

// 名称: CFileWatcher
// 功能: 监测指定目录中的文件/目录的改变
// 环境要求: Requires Windows NT 3.51 SP3 or later, and Unsupported Windows 95/98.
// 作者: 程红秀
// 日期: 2004-11-10
// 说明: Windows XP SP1 下测试通过

#define _WIN32_WINNT 0x0500

#include <windows.h>
#include <string>
using namespace std;


/*-------------------------类的定义部分------------------------*/
class CFileWatcher  
{
public:
	bool StartWatch( string path);	//开始监视
	CFileWatcher()		// 初始化 
    {	
		hThread=NULL;
		hDir=INVALID_HANDLE_VALUE  ;
	}
    ~CFileWatcher()  
	{
		if(hThread !=NULL)
		{
			::TerminateThread(hThread, 0 );
			hThread = NULL;
		}
		if(hDir !=INVALID_HANDLE_VALUE)
		{
			CloseHandle( hDir );
			hDir = INVALID_HANDLE_VALUE;
		}
	}
	
private:
    string strWatchedDir;
    HANDLE hThread;
    HANDLE hDir;	
private:
    static DWORD WINAPI ThreadProc( LPVOID lParam ) ; //线程函数，用来监视
};









/*-------------------------类的函数实现部分------------------------*/
bool CFileWatcher::StartWatch( string path)
{
	strWatchedDir = path;
	
	DWORD ThreadId;  //创建一个新线程用于监视
	hThread=::CreateThread(NULL,0,ThreadProc,this,0,&ThreadId );
	
	return NULL!=hThread;
}

DWORD WINAPI CFileWatcher::ThreadProc( LPVOID lParam )  //线程函数
{
	CFileWatcher* obj = (CFileWatcher*)lParam;  //参数转化
	
	obj->hDir = CreateFile(            //打开目录，得到目录的句柄
		obj->strWatchedDir.c_str(),
		GENERIC_READ|GENERIC_WRITE,
		FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE,
		NULL,
		OPEN_EXISTING,
		FILE_FLAG_BACKUP_SEMANTICS,
		NULL
        ); 
	if(obj->hDir ==INVALID_HANDLE_VALUE  ) 
		return false;
	
	char buf[(sizeof(FILE_NOTIFY_INFORMATION)+MAX_PATH)*2];
	FILE_NOTIFY_INFORMATION* pNotify=(FILE_NOTIFY_INFORMATION*)buf;
	DWORD dwBytesReturned;        
	while(true)
	{
		if( ::ReadDirectoryChangesW( obj->hDir,
			pNotify,
			sizeof(buf),
			true,
			FILE_NOTIFY_CHANGE_FILE_NAME|
			FILE_NOTIFY_CHANGE_DIR_NAME|
			FILE_NOTIFY_CHANGE_ATTRIBUTES|
			FILE_NOTIFY_CHANGE_SIZE|
			FILE_NOTIFY_CHANGE_LAST_WRITE|
			FILE_NOTIFY_CHANGE_LAST_ACCESS|
			FILE_NOTIFY_CHANGE_CREATION|
			FILE_NOTIFY_CHANGE_SECURITY,
			&dwBytesReturned,
			NULL,
			NULL ) )
		{
			char tmp[MAX_PATH], str1[MAX_PATH], str2[MAX_PATH];
			memset( tmp, 0, sizeof(tmp) ); //ZeroMemory()
			WideCharToMultiByte( CP_ACP,0,pNotify->FileName,pNotify->FileNameLength/2,tmp,99,NULL,NULL );
			strcpy( str1, tmp );
			
			if(pNotify->NextEntryOffset !=0 )
			{
				PFILE_NOTIFY_INFORMATION p = (PFILE_NOTIFY_INFORMATION)((char*)pNotify+pNotify->NextEntryOffset);
				memset( tmp, 0, sizeof(tmp) );
				WideCharToMultiByte( CP_ACP,0,p->FileName,p->FileNameLength/2,tmp,99,NULL,NULL );
				strcpy( str2, tmp );
			}
			switch(pNotify->Action)
			{
				case FILE_ACTION_ADDED:
					cout << "添加了新文件： " << str1 << endl;	break;
				case FILE_ACTION_REMOVED:
					cout << "删除了文件： " << str1 << endl;	break;
				case FILE_ACTION_MODIFIED:
					cout << "修改了文件：" << str1 << endl;	break;
				case FILE_ACTION_RENAMED_NEW_NAME:
					cout << "重命名了文件" << str1 << " " << str2 << endl;	break;
			}		
		}
		else           
			break;           
	}
	return 0;
}