Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / clr / src / BCL / System / IO / DriveInfo.cs / 1 / DriveInfo.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================ ** ** Class: DriveInfo ** ** ** Purpose: Exposes routines for exploring a drive. ** ** ===========================================================*/ using System; using System.Text; using System.Runtime.InteropServices; using Microsoft.Win32; using System.Security.Permissions; using System.Runtime.Serialization; using System.Runtime.Versioning; namespace System.IO { // Matches Win32's DRIVE_XXX #defines from winbase.h [Serializable] [System.Runtime.InteropServices.ComVisible(true)] public enum DriveType { Unknown = 0, NoRootDirectory = 1, Removable = 2, Fixed = 3, Network = 4, CDRom = 5, Ram = 6 } // Ideally we'll get a better security permission, but possibly // not for Whidbey. [Serializable] [ComVisible(true)] public sealed class DriveInfo : ISerializable { private String _name; private const String NameField = "_name"; // For serialization public DriveInfo(String driveName) { if (driveName == null) throw new ArgumentNullException("driveName"); if (driveName.Length == 1) _name = driveName + ":\\"; else { // GetPathRoot does not check all invalid characters Path.CheckInvalidPathChars(driveName); _name = Path.GetPathRoot(driveName); // Disallow null or empty drive letters and UNC paths if (_name == null || _name.Length == 0 || _name.StartsWith("\\\\", StringComparison.Ordinal)) throw new ArgumentException(Environment.GetResourceString("Arg_MustBeDriveLetterOrRootDir")); } // We want to normalize to have a trailing backslash so we don't have two equivalent forms and // because some Win32 API don't work without it. if (_name.Length == 2 && _name[1] == ':') { _name = _name + "\\"; } // Now verify that the drive letter could be a real drive name. // On Windows this means it's between A and Z, ignoring case. // On a Unix platform, perhaps this should be a device name with // a partition like /dev/hdc0, or possibly a mount point. char letter = driveName[0]; if (!((letter >= 'A' && letter <= 'Z') || (letter >= 'a' && letter <= 'z'))) throw new ArgumentException(Environment.GetResourceString("Arg_MustBeDriveLetterOrRootDir")); // Now do a security check. String demandPath = _name + '.'; new FileIOPermission(FileIOPermissionAccess.PathDiscovery, demandPath).Demand(); } private DriveInfo(SerializationInfo info, StreamingContext context) { // Need to add in a security check here once it has been spec'ed. _name = (String) info.GetValue(NameField, typeof(String)); // Now do a security check. String demandPath = _name + '.'; new FileIOPermission(FileIOPermissionAccess.PathDiscovery, demandPath).Demand(); } public String Name { get { return _name; } } public DriveType DriveType { get { // GetDriveType can't fail return (DriveType) Win32Native.GetDriveType(Name); } } public String DriveFormat { [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Process, ResourceScope.Process)] get { const int volNameLen = 50; StringBuilder volumeName = new StringBuilder(volNameLen); const int fileSystemNameLen = 50; StringBuilder fileSystemName = new StringBuilder(fileSystemNameLen); int serialNumber, maxFileNameLen, fileSystemFlags; int oldMode = Win32Native.SetErrorMode(Win32Native.SEM_FAILCRITICALERRORS); try { bool r = Win32Native.GetVolumeInformation(Name, volumeName, volNameLen, out serialNumber, out maxFileNameLen, out fileSystemFlags, fileSystemName, fileSystemNameLen); if (!r) { int errorCode = Marshal.GetLastWin32Error(); // Win9x appears to return ERROR_INVALID_DATA when a // drive doesn't exist. if (errorCode == Win32Native.ERROR_INVALID_DATA) errorCode = Win32Native.ERROR_INVALID_DRIVE; __Error.WinIODriveError(Name, errorCode); } } finally { Win32Native.SetErrorMode(oldMode); } return fileSystemName.ToString(); } } public bool IsReady { [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] get { return Directory.InternalExists(Name); } } public long AvailableFreeSpace { [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Process, ResourceScope.Process)] get { long userBytes, totalBytes, freeBytes; int oldMode = Win32Native.SetErrorMode(Win32Native.SEM_FAILCRITICALERRORS); try { bool r = Win32Native.GetDiskFreeSpaceEx(Name, out userBytes, out totalBytes, out freeBytes); if (!r) __Error.WinIODriveError(Name); } finally { Win32Native.SetErrorMode(oldMode); } return userBytes; } } public long TotalFreeSpace { [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Process, ResourceScope.Process)] get { long userBytes, totalBytes, freeBytes; int oldMode = Win32Native.SetErrorMode(Win32Native.SEM_FAILCRITICALERRORS); try { bool r = Win32Native.GetDiskFreeSpaceEx(Name, out userBytes, out totalBytes, out freeBytes); if (!r) __Error.WinIODriveError(Name); } finally { Win32Native.SetErrorMode(oldMode); } return freeBytes; } } public long TotalSize { [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Process, ResourceScope.Process)] get { // Don't cache this, to handle variable sized floppy drives // or other various removable media drives. long userBytes, totalBytes, freeBytes; int oldMode = Win32Native.SetErrorMode(Win32Native.SEM_FAILCRITICALERRORS); try { bool r = Win32Native.GetDiskFreeSpaceEx(Name, out userBytes, out totalBytes, out freeBytes); if (!r) __Error.WinIODriveError(Name); } finally { Win32Native.SetErrorMode(oldMode); } return totalBytes; } } [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public static DriveInfo[] GetDrives() { // Directory.GetLogicalDrives demands unmanaged code permission String[] drives = Directory.GetLogicalDrives(); DriveInfo[] di = new DriveInfo[drives.Length]; for(int i=0; i// No need for LinkDemand of SerializationFormatter here as this is a interface private // methodimpl and the linkdeamand specified on ISerializable will cover this. void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context) { // No need for an additional security check - everything is public. info.AddValue(NameField, _name, typeof(String)); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================ ** ** Class: DriveInfo ** ** ** Purpose: Exposes routines for exploring a drive. ** ** ===========================================================*/ using System; using System.Text; using System.Runtime.InteropServices; using Microsoft.Win32; using System.Security.Permissions; using System.Runtime.Serialization; using System.Runtime.Versioning; namespace System.IO { // Matches Win32's DRIVE_XXX #defines from winbase.h [Serializable] [System.Runtime.InteropServices.ComVisible(true)] public enum DriveType { Unknown = 0, NoRootDirectory = 1, Removable = 2, Fixed = 3, Network = 4, CDRom = 5, Ram = 6 } // Ideally we'll get a better security permission, but possibly // not for Whidbey. [Serializable] [ComVisible(true)] public sealed class DriveInfo : ISerializable { private String _name; private const String NameField = "_name"; // For serialization public DriveInfo(String driveName) { if (driveName == null) throw new ArgumentNullException("driveName"); if (driveName.Length == 1) _name = driveName + ":\\"; else { // GetPathRoot does not check all invalid characters Path.CheckInvalidPathChars(driveName); _name = Path.GetPathRoot(driveName); // Disallow null or empty drive letters and UNC paths if (_name == null || _name.Length == 0 || _name.StartsWith("\\\\", StringComparison.Ordinal)) throw new ArgumentException(Environment.GetResourceString("Arg_MustBeDriveLetterOrRootDir")); } // We want to normalize to have a trailing backslash so we don't have two equivalent forms and // because some Win32 API don't work without it. if (_name.Length == 2 && _name[1] == ':') { _name = _name + "\\"; } // Now verify that the drive letter could be a real drive name. // On Windows this means it's between A and Z, ignoring case. // On a Unix platform, perhaps this should be a device name with // a partition like /dev/hdc0, or possibly a mount point. char letter = driveName[0]; if (!((letter >= 'A' && letter <= 'Z') || (letter >= 'a' && letter <= 'z'))) throw new ArgumentException(Environment.GetResourceString("Arg_MustBeDriveLetterOrRootDir")); // Now do a security check. String demandPath = _name + '.'; new FileIOPermission(FileIOPermissionAccess.PathDiscovery, demandPath).Demand(); } private DriveInfo(SerializationInfo info, StreamingContext context) { // Need to add in a security check here once it has been spec'ed. _name = (String) info.GetValue(NameField, typeof(String)); // Now do a security check. String demandPath = _name + '.'; new FileIOPermission(FileIOPermissionAccess.PathDiscovery, demandPath).Demand(); } public String Name { get { return _name; } } public DriveType DriveType { get { // GetDriveType can't fail return (DriveType) Win32Native.GetDriveType(Name); } } public String DriveFormat { [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Process, ResourceScope.Process)] get { const int volNameLen = 50; StringBuilder volumeName = new StringBuilder(volNameLen); const int fileSystemNameLen = 50; StringBuilder fileSystemName = new StringBuilder(fileSystemNameLen); int serialNumber, maxFileNameLen, fileSystemFlags; int oldMode = Win32Native.SetErrorMode(Win32Native.SEM_FAILCRITICALERRORS); try { bool r = Win32Native.GetVolumeInformation(Name, volumeName, volNameLen, out serialNumber, out maxFileNameLen, out fileSystemFlags, fileSystemName, fileSystemNameLen); if (!r) { int errorCode = Marshal.GetLastWin32Error(); // Win9x appears to return ERROR_INVALID_DATA when a // drive doesn't exist. if (errorCode == Win32Native.ERROR_INVALID_DATA) errorCode = Win32Native.ERROR_INVALID_DRIVE; __Error.WinIODriveError(Name, errorCode); } } finally { Win32Native.SetErrorMode(oldMode); } return fileSystemName.ToString(); } } public bool IsReady { [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] get { return Directory.InternalExists(Name); } } public long AvailableFreeSpace { [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Process, ResourceScope.Process)] get { long userBytes, totalBytes, freeBytes; int oldMode = Win32Native.SetErrorMode(Win32Native.SEM_FAILCRITICALERRORS); try { bool r = Win32Native.GetDiskFreeSpaceEx(Name, out userBytes, out totalBytes, out freeBytes); if (!r) __Error.WinIODriveError(Name); } finally { Win32Native.SetErrorMode(oldMode); } return userBytes; } } public long TotalFreeSpace { [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Process, ResourceScope.Process)] get { long userBytes, totalBytes, freeBytes; int oldMode = Win32Native.SetErrorMode(Win32Native.SEM_FAILCRITICALERRORS); try { bool r = Win32Native.GetDiskFreeSpaceEx(Name, out userBytes, out totalBytes, out freeBytes); if (!r) __Error.WinIODriveError(Name); } finally { Win32Native.SetErrorMode(oldMode); } return freeBytes; } } public long TotalSize { [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Process, ResourceScope.Process)] get { // Don't cache this, to handle variable sized floppy drives // or other various removable media drives. long userBytes, totalBytes, freeBytes; int oldMode = Win32Native.SetErrorMode(Win32Native.SEM_FAILCRITICALERRORS); try { bool r = Win32Native.GetDiskFreeSpaceEx(Name, out userBytes, out totalBytes, out freeBytes); if (!r) __Error.WinIODriveError(Name); } finally { Win32Native.SetErrorMode(oldMode); } return totalBytes; } } [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public static DriveInfo[] GetDrives() { // Directory.GetLogicalDrives demands unmanaged code permission String[] drives = Directory.GetLogicalDrives(); DriveInfo[] di = new DriveInfo[drives.Length]; for(int i=0; i // No need for LinkDemand of SerializationFormatter here as this is a interface private // methodimpl and the linkdeamand specified on ISerializable will cover this. void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context) { // No need for an additional security check - everything is public. info.AddValue(NameField, _name, typeof(String)); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ClientScriptManagerWrapper.cs
- WebEventCodes.cs
- Underline.cs
- LayoutTableCell.cs
- DrawListViewItemEventArgs.cs
- HtmlDocument.cs
- Configuration.cs
- OracleTransaction.cs
- RequestCacheEntry.cs
- CustomExpressionEventArgs.cs
- CfgParser.cs
- Line.cs
- StatusBarDrawItemEvent.cs
- PerformanceCounterLib.cs
- XmlLinkedNode.cs
- XmlTextReaderImplHelpers.cs
- AspNetSynchronizationContext.cs
- ServiceEndpointElementCollection.cs
- XmlWriterSettings.cs
- ApplicationFileParser.cs
- XsltLibrary.cs
- PreloadedPackages.cs
- DataBindingCollection.cs
- Publisher.cs
- NumericExpr.cs
- Size3D.cs
- GraphicsPathIterator.cs
- WebAdminConfigurationHelper.cs
- FixUp.cs
- UIAgentCrashedException.cs
- PolicyException.cs
- LoginCancelEventArgs.cs
- ParenthesizePropertyNameAttribute.cs
- SuppressMergeCheckAttribute.cs
- CacheModeValueSerializer.cs
- StorageEntityContainerMapping.cs
- _CommandStream.cs
- OperatingSystem.cs
- DocumentAutomationPeer.cs
- GridViewUpdateEventArgs.cs
- Socket.cs
- StorageBasedPackageProperties.cs
- SubMenuStyleCollection.cs
- KeyValuePairs.cs
- ProcessHost.cs
- BufferModesCollection.cs
- ReverseComparer.cs
- BitmapPalette.cs
- QilGenerator.cs
- CanonicalFontFamilyReference.cs
- HtmlControlPersistable.cs
- StatusBar.cs
- MenuItemStyle.cs
- Ray3DHitTestResult.cs
- DataControlFieldCell.cs
- DebugControllerThread.cs
- OpenCollectionAsyncResult.cs
- FloatUtil.cs
- BufferedMessageData.cs
- IImplicitResourceProvider.cs
- StagingAreaInputItem.cs
- AttachmentCollection.cs
- DataBinding.cs
- ExpressionEditor.cs
- ApplicationId.cs
- ProxyGenerationError.cs
- ColorBuilder.cs
- XDeferredAxisSource.cs
- StringReader.cs
- DataGridViewDataErrorEventArgs.cs
- Binding.cs
- InlineCollection.cs
- BrushConverter.cs
- PreservationFileReader.cs
- HttpsHostedTransportConfiguration.cs
- DataException.cs
- _SafeNetHandles.cs
- DbProviderConfigurationHandler.cs
- IMembershipProvider.cs
- RowToFieldTransformer.cs
- IIS7UserPrincipal.cs
- DbConnectionPoolGroupProviderInfo.cs
- FeedUtils.cs
- SelectionProviderWrapper.cs
- WindowsContainer.cs
- unitconverter.cs
- EncryptedXml.cs
- CardSpaceException.cs
- formatter.cs
- CheckedListBox.cs
- BaseValidator.cs
- TextFormatter.cs
- TextTreeTextElementNode.cs
- XmlNamespaceMappingCollection.cs
- WebPartDisplayModeEventArgs.cs
- Point4D.cs
- ReadOnlyObservableCollection.cs
- AdRotator.cs
- ImmComposition.cs
- XPathNodeList.cs