ReadDirectoryChangesWで開いたフォルダーをスパイするために使用してCreateFileいます。ファイルが追加されたらOnFileChanged、サイズを読み取って読み取り用に開く関数（）を呼び出します。アプリケーションは小さなサイズのファイルに対しては正常に動作しますが、しようとすると問題が発生します大きなファイルを自分のフォルダー (7,24 M) にコピーすると、Permission deniedfopen を呼び出して読み取るとエラーが発生します。
監視プロセスはこれに基づいています
void Init(const QString FullPath)
{ ...
hDir = CreateFile(
dirPath, // pointer to the directory containing the tex files
FILE_LIST_DIRECTORY|GENERIC_READ, // access (read-write) mode
FILE_SHARE_READ|FILE_SHARE_DELETE|FILE_SHARE_WRITE, // share mode
NULL, // security descriptor
OPEN_EXISTING, // how to create
FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OVERLAPPED , // file attributes
NULL); // file with attributes to copy
SecureZeroMemory (&overl, sizeof(overl));
SecureZeroMemory(buffer, sizeof(buffer));
overl.hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
// watch the directory
BOOL res= ReadDirectoryChangesW(
hDir, /* handle to directory */
&buffer[curBuffer], /* read results buffer */
sizeof(buffer[curBuffer]), /* length of buffer */
FALSE, /* monitoring option */
FILE_NOTIFY_CHANGE_FILE_NAME ,
//FILE_NOTIFY_CHANGE_LAST_WRITE, /* filter conditions */
NULL, /* bytes returned */
&overl, /* overlapped buffer */
NULL); /* completion routine */
}
void StartWatchThread()
{
// if the thread already exists then stop it
if (IsThreadRunning())
SynchronousAbort();
//CrashIf(!hDir);
if(!hDir)
{ qDebug()<<" handle "<<hDir<<" last error"<<GetLastError();
exit(-1);}
else
{// reset the hEvtStopWatching event so that it can be set if
// some thread requires the watching thread to stop
ResetEvent(hEvtStopWatching);
DWORD watchingthreadID;
qDebug()<<"befrore creating thread";
hWatchingThread = CreateThread(NULL, 0, WatchingThread, this, 0, &watchingthreadID);
qDebug()<<"watchingthreadID"<<watchingthreadID;
}
}
DWORD WINAPI WatchingThread(void *param)
{
//qDebug()<<"in WatchingThread";
FileWatcher *fw = (FileWatcher *)param;
HANDLE hp[2] = { fw->hEvtStopWatching, fw->overl.hEvent };
for (;;)
{
DWORD dwObj = WaitForMultipleObjects((sizeof(hp)/(sizeof(hp[0])))
, hp, FALSE, INFINITE);
if (dwObj == WAIT_OBJECT_0) // the user asked to quit the program
{
qDebug()<<"in WatchingThread the user asked to quit the program";
//exit(-1);
break;
}
if (dwObj != WAIT_OBJECT_0 + 1)
{
// BUG!
//assert(0);
qDebug()<<"dwObj "<<dwObj<<" last error "<<GetLastError();
break;
}
//qDebug()<<"WatchingThread fw->NotifyChange() ";
//if (fw->wakeup)
fw->NotifyChange();
}
return 0;
}
bool NotifyChange()
{
//qDebug()<<"in NotifyChange";
GetOverlappedResult(hDir, &overl, &dwNumberbytes, FALSE);
FILE_NOTIFY_INFORMATION *pFileNotify = (FILE_NOTIFY_INFORMATION *)buffer[curBuffer];
// Switch the 2 buffers
curBuffer = (curBuffer + 1) % (sizeof(buffer)/(sizeof(buffer[0])));
SecureZeroMemory(buffer[curBuffer], sizeof(buffer[curBuffer]));
// start a new asynchronous call to ReadDirectory in the alternate buffer
ReadDirectoryChangesW(
hDir, /* handle to directory */
&buffer[curBuffer], /* read results buffer */
sizeof(buffer[curBuffer]), /* length of buffer */
FALSE, /* monitoring option */
FILE_NOTIFY_CHANGE_FILE_NAME ,
//FILE_NOTIFY_CHANGE_LAST_WRITE, /* filter conditions */
NULL, /* bytes returned */
&overl, /* overlapped buffer */
NULL); /* completion routine */
// Note: the ReadDirectoryChangesW API fills the buffer with WCHAR strings.
for (;;) {
if (pFileNotify->Action == FILE_ACTION_ADDED)
{
qDebug()<<"in NotifyChange if ";
char szAction[42];
char szFilename[MAX_PATH] ;
memset(szFilename,'\0',sizeof( szFilename));
strcpy(szAction,"added");
wcstombs( szFilename, pFileNotify->FileName, MAX_PATH);
OnFileChanged(szFilename,szAction);
qDebug()<<"in NotifyChange after OnFileChanged ";
}
// step to the next entry if there is one
if (!pFileNotify->NextEntryOffset)
return false;
pFileNotify = (FILE_NOTIFY_INFORMATION *)((PBYTE)pFileNotify + pFileNotify->NextEntryOffset);
}
pFileNotify=NULL;
return true;
}
ファイルの処理方法がわかりませんでした。それを読み取らせてくれませんか? 呼び出した後に Sleep() を呼び出しOnFileChanged、終了したら目を覚まそうとしましたが、無駄でした。任意のアイデアをお願いします。