C++ BVolume::InitCheck方法代码示例

bool
GeneralView::_CanFindServer(entry_ref* ref)
{
	// Try searching with be_roster
	if (be_roster->FindApp(kNotificationServerSignature, ref) == B_OK)
		return true;

	// Try with a query and take the first result
	BVolumeRoster vroster;
	BVolume volume;
	char volName[B_FILE_NAME_LENGTH];

	vroster.Rewind();

	while (vroster.GetNextVolume(&volume) == B_OK) {
		if ((volume.InitCheck() != B_OK) || !volume.KnowsQuery())
			continue;

		volume.GetName(volName);

		BQuery *query = new BQuery();
		query->SetPredicate("(BEOS:APP_SIG==\""kNotificationServerSignature"\")");
		query->SetVolume(&volume);
		query->Fetch();

		if (query->GetNextRef(ref) == B_OK)
			return true;
	}

	return false;
}

/*!	\brief Finds a BPartition by mount path.
*/
status_t
BDiskDeviceRoster::FindPartitionByMountPoint(const char* mountPoint,
	BDiskDevice* device, BPartition** _partition)
{
	BVolume volume(dev_for_path(mountPoint));
	if (volume.InitCheck() == B_OK
		&& FindPartitionByVolume(volume, device, _partition))
		return B_OK;

	return B_ENTRY_NOT_FOUND;
}

// SymLink handling:
// symlink pose uses the resolved model to retrieve the icon, if not broken
// everything else, like the attributes, etc. is retrieved directly from the
// symlink itself
BPose::BPose(Model* model, BPoseView* view, uint32 clipboardMode,
	bool selected)
	:
	fModel(model),
	fWidgetList(4, true),
	fClipboardMode(clipboardMode),
	fPercent(-1),
	fSelectionTime(0),
	fIsSelected(selected),
	fHasLocation(false),
	fNeedsSaveLocation(false),
	fListModeInited(false),
	fWasAutoPlaced(false),
	fBrokenSymLink(false),
	fBackgroundClean(false)
{
	CreateWidgets(view);

	if (model->IsVolume()) {
		fs_info info;
		dev_t device = model->NodeRef()->device;
		BVolume* volume = new BVolume(device);
		if (volume->InitCheck() == B_OK
			&& fs_stat_dev(device, &info) == B_OK) {
			// Philosophy here:
			// Bars go on all read/write volumes
			// Exceptions: Not on CDDA
			if (strcmp(info.fsh_name,"cdda") != 0
				&& !volume->IsReadOnly()) {
				// The volume is ok and we want space bars on it
				gPeriodicUpdatePoses.AddPose(this, view,
					_PeriodicUpdateCallback, volume);
				if (TrackerSettings().ShowVolumeSpaceBar())
					fPercent = CalcFreeSpace(volume);
			} else
				delete volume;
		} else
			delete volume;
	}
}

/*!	\brief Returns whether two BVolume objects are equal.

	Two volume objects are said to be equal, if they either are both
	uninitialized, or both are initialized and refer to the same volume.

	\param volume The object to be compared with.
	\result \c true, if this object and the supplied one are equal, \c false
			otherwise.
*/
bool
BVolume::operator==(const BVolume &volume) const
{
	return ((InitCheck() != B_OK && volume.InitCheck() != B_OK)
			|| fDevice == volume.fDevice);
}