在线请教：我用findfirstchangenotification监视文件夹是否不改变，但我如何知道是该文件夹下哪一个文件的改变谢谢
在线请教：我用findfirstchangenotification监视文件夹是否不改变，但我如何知道是该文件夹下哪一个文件的改变谢谢 问题点数：0、回复次数：2Top
1 楼wwwllg（野蛮人）回复于 2004-05-04 09:34:04 得分 0
// FileWatch.cpp: implementation of the CFileWatch class.
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "WatchFile.h"
#include "FileWatch.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CFileWatch::CFileWatch()
{
hCompPort=NULL;
m_bStop = true;
numDirs = 0;
memset(DirInfo,0,sizeof(DIRECTORY_INFO)*MAX_DIRS);
}
CFileWatch::~CFileWatch()
{
}
BOOL CFileWatch::WatchDirectories( char *lpStrpath )
{
if(numDirs > MAX_DIRS)
return false;
DirInfo[numDirs].hDir = CreateFile( lpStrpath,
FILE_LIST_DIRECTORY,
FILE_SHARE_READ |
FILE_SHARE_WRITE |
FILE_SHARE_DELETE,
NULL,
OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS |
FILE_FLAG_OVERLAPPED,
NULL);
if( DirInfo[numDirs].hDir == INVALID_HANDLE_VALUE )
{
return false;
}
strcpy( DirInfo[numDirs].lpszDirName, lpStrpath );
hCompPort=CreateIoCompletionPort( DirInfo[numDirs].hDir,
hCompPort,(DWORD) &DirInfo[numDirs],0);
numDirs ++;
if(m_bStop)
{
AfxBeginThread(Watch,this);
m_bStop = !m_bStop;
}
return true;
}
void CFileWatch::WatchDirectories( HANDLE hCompPort )
{
DWORD i;
// DWORD tid;
// HANDLE hThread;
// Start watching each of the directories of interest
for (i=0;i<numDirs;i++)
{
if(!ReadDirectoryChangesW( DirInfo[i].hDir,
DirInfo[i].lpBuffer,
MAX_BUFFER,
TRUE,
FILE_NOTIFY_CHANGE_LAST_WRITE,
&DirInfo[i].dwBufLength,
&DirInfo[i].Overlapped,
NULL))
{
int tt=GetLastError();
}
}
// Create a thread to sit on the directory changes
CWinThread *pThread = AfxBeginThread(HandleDirectoryChange,(LPVOID)hCompPort);
// hThread = CreateThread( NULL,
// 0,
// (LPTHREAD_START_ROUTINE) HandleDirectoryChange,(LPVOID)
// hCompPort,
// 0,
// &tid);
WaitForSingleObject( pThread->m_hThread, INFINITE );
CloseHandle( pThread->m_hThread );
}
void CFileWatch::CheckChangedFile( LPDIRECTORY_INFO lpdi,
PFILE_NOTIFY_INFORMATION lpfni)
{
TRACE("test is ok\n");
/*
TCHAR szFullPathName[MAX_PATH];
TCHAR *p;
HANDLE hFile;
FILETIME LocalFileTime;
SYSTEMTIME SystemTime;
BY_HANDLE_FILE_INFORMATION FileInfo;
p = FileList;
while(*p && lstrcmpi(p,lpfni->FileName))
p+=(lstrlen(p)+1);
if(*p)
{
lstrcpy( szFullPathName, lpdi->lpszDirName );
lstrcat( szFullPathName, L"\\" );
lstrcat( szFullPathName, lpfni->FileName );
// we assume that the file was changed, since
// that is the only thing we look for in this sample
wprintf( L"%s changed,", szFullPathName );
hFile=CreateFile( szFullPathName,
GENERIC_READ,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
FILE_FLAG_SEQUENTIAL_SCAN,
0);
GetFileInformationByHandle( hFile, &FileInfo );
FileTimeToLocalFileTime( &(FileInfo.ftLastWriteTime), &LocalFileTime );
FileTimeToSystemTime( &LocalFileTime, &SystemTime );
wprintf( L" Size = %d bytes,", FileInfo.nFileSizeLow );
wprintf( L" Last Access = %02d/%02d/%02d %02d:%02d:%02d",
SystemTime.wMonth,
SystemTime.wDay,
SystemTime.wYear,
SystemTime.wHour,
SystemTime.wMinute,
SystemTime.wSecond );
CloseHandle( hFile );
wprintf( L"\n" );
}
*/
}
UINT CFileWatch::HandleDirectoryChange( LPVOID pParam )
{
HANDLE dwCompletionPort = (HANDLE) pParam;
if(dwCompletionPort == NULL)
return 0;
DWORD numBytes;
DWORD cbOffset;
LPDIRECTORY_INFO di;
LPOVERLAPPED lpOverlapped;
PFILE_NOTIFY_INFORMATION fni;
do
{
// Retrieve the directory info for this directory
// through the completion key
GetQueuedCompletionStatus( (HANDLE) dwCompletionPort,
&numBytes,
(LPDWORD) &di,
&lpOverlapped,
INFINITE);
int tt =0;
if ( di )
{
fni = (PFILE_NOTIFY_INFORMATION)di->lpBuffer;
do
{
cbOffset = fni->NextEntryOffset;
if( fni->Action == FILE_ACTION_MODIFIED )
{
CheckChangedFile( di, fni );
}
fni = (PFILE_NOTIFY_INFORMATION)((LPBYTE) fni + cbOffset);
} while( cbOffset );
// Reissue the watch command
ReadDirectoryChangesW( di->hDir,di->lpBuffer,
MAX_BUFFER,
TRUE,
FILE_NOTIFY_CHANGE_LAST_WRITE,
&di->dwBufLength,
&di->Overlapped,
NULL);
}
} while( di );
return 0;
}
void CFileWatch::Reset()
{
}
void CFileWatch::StopWatch()
{
PostQueuedCompletionStatus( hCompPort, 0, 0, NULL );
Reset();
}
UINT CFileWatch::Watch(LPVOID pParam)
{
CFileWatch *watch =(CFileWatch*)pParam;
if(watch == NULL)
return 1;
watch->WatchDirectories(watch->hCompPort);
return 0;
}
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2 楼codewarrior（会思考的草）回复于 2004-06-08 10:00:05 得分 0
或者使用SHChangeNotifyRegister/SHChangeNotifyDeregister.LRESULT CThumbnailListCtrl::OnFileChanged(WPARAM wParam, LPARAM lParam)
{
SHNotifyInfo* pShellInfo = (SHNotifyInfo*)wParam;
if(m_strCurrentDir.IsEmpty())
{
return 0;
}
switch(lParam)
{
case SHCNE_DELETE:
{
//deleted file
CString strPathName = GetPathFromPIDL(pShellInfo->dwItem1);
CString strPath = ExtractPath(strPathName); break;
}
............
}Top
