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WiP: switch to ReadDirectoryChangesW

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This commit is contained in:
Daniel Molkentin 2014-11-06 00:36:04 +01:00
parent a49a6bfd88
commit 96a7118d05
1 changed files with 54 additions and 33 deletions
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87
src/mirall/folderwatcher_win.cpp
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@ -25,42 +25,63 @@ namespace Mirall {
void WatcherThread::run()
{
_handle = FindFirstChangeNotification((wchar_t*)_path.utf16(),
true, // recursive watch
FILE_NOTIFY_CHANGE_FILE_NAME |
FILE_NOTIFY_CHANGE_DIR_NAME |
FILE_NOTIFY_CHANGE_LAST_WRITE);
if (_handle == INVALID_HANDLE_VALUE)
{
qDebug() << Q_FUNC_INFO << "FindFirstChangeNotification function failed, stopping watcher!";
FindCloseChangeNotification(_handle);
_handle = 0;
return;
}
if (_handle == NULL)
{
qDebug() << Q_FUNC_INFO << "FindFirstChangeNotification returned null, stopping watcher!";
FindCloseChangeNotification(_handle);
_handle = 0;
return;
}
_handle = CreateFileW(
(wchar_t*)_path.utf16(),
FILE_LIST_DIRECTORY,
FILE_SHARE_WRITE | FILE_SHARE_READ | FILE_SHARE_DELETE,
NULL,
OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS,
NULL
);
size_t bufsize = 4096;
size_t maxlen = 4096;
while(true) {
switch(WaitForSingleObject(_handle, /*wait*/ INFINITE)) {
case WAIT_OBJECT_0:
if (FindNextChangeNotification(_handle) == false) {
qDebug() << Q_FUNC_INFO << "FindFirstChangeNotification returned FALSE, stopping watcher!";
FindCloseChangeNotification(_handle);
_handle = 0;
return;
char fileNotify[bufsize];
// TODO: handle CreateFileW failure
FILE_NOTIFY_INFORMATION *pFileNotify =
(FILE_NOTIFY_INFORMATION*)fileNotify;
DWORD dwBytesReturned = 0;
SecureZeroMemory(pFileNotify, bufsize);
if(ReadDirectoryChangesW( _handle, (LPVOID)pFileNotify,
bufsize, true,
FILE_NOTIFY_CHANGE_LAST_WRITE |
FILE_NOTIFY_CHANGE_DIR_NAME |
FILE_NOTIFY_CHANGE_LAST_WRITE,
&dwBytesReturned, NULL, NULL))
{
FILE_NOTIFY_INFORMATION *curEntry = pFileNotify;
while(true) {
size_t len = pFileNotify->FileNameLength / 2;
QString file = _path + "\\" + QString::fromWCharArray(pFileNotify->FileName, len);
QScopedArrayPointer<TCHAR> buffer(new TCHAR[maxlen]);
if (GetLongPathNameW(reinterpret_cast<LPCWSTR>(file.utf16()), buffer.data(), maxlen) == 0) {
qDebug() << "Error converting file name to full length";
}
const QString longfile = QString::fromUtf16(reinterpret_cast<const ushort *>(buffer.data()), maxlen-1);
qDebug() << Q_FUNC_INFO << "Found change in" << file;
emit changed(longfile);
if (curEntry->NextEntryOffset == 0) {
break;
}
curEntry = (FILE_NOTIFY_INFORMATION*)
(char*)curEntry + curEntry->NextEntryOffset;
}
} else {
switch(GetLastError()) {
case ERROR_NOTIFY_ENUM_DIR:
qDebug() << Q_FUNC_INFO << "Too many events for buffer, resizing";
bufsize *= 2;
break;
default:
qDebug() << Q_FUNC_INFO << "General error while watching. Exiting.";
CloseHandle(_handle);
_handle = NULL;
break;
}
// qDebug() << Q_FUNC_INFO << "Change detected in" << _path << "from" << QThread::currentThread ();
emit changed(_path);
break;
default:
qDebug() << Q_FUNC_INFO << "Error while watching";
}
}
}