Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Input / Cursor.cs / 1305600 / Cursor.cs
using System; using System.ComponentModel; using System.Text; using System.Globalization; using MS.Win32; using System.Runtime.InteropServices; using System.Resources; using System.IO; using System.Security; using System.Security.Permissions; using SecurityHelper=MS.Internal.SecurityHelper; using SR=MS.Internal.PresentationCore.SR; using SRID=MS.Internal.PresentationCore.SRID; using MS.Internal.PresentationCore; // FriendAccessAllowed namespace System.Windows.Input { ////// Cursor class to support default cursor types. /// TBD: Support for cutomized cursor types. /// [TypeConverter(typeof(CursorConverter))] [Localizability(LocalizationCategory.None, Readability = Readability.Unreadable)] public sealed class Cursor : IDisposable { ////// Constructor for Standard Cursors, needn't be public as Stock Cursors /// are exposed in Cursors clas. /// /// internal Cursor(CursorType cursorType) { if (IsValidCursorType(cursorType)) { LoadCursorHelper(cursorType); } else { throw new ArgumentException(SR.Get(SRID.InvalidCursorType, cursorType)); } } ////// Cursor from .ani or .cur file /// /// public Cursor(string cursorFile) { if (cursorFile == null) throw new ArgumentNullException("cursorFile"); if ((cursorFile != String.Empty) && (cursorFile.EndsWith(".cur", StringComparison.OrdinalIgnoreCase) || cursorFile.EndsWith(".ani", StringComparison.OrdinalIgnoreCase))) { LoadFromFile(cursorFile); _fileName = cursorFile; } else { throw new ArgumentException(SR.Get(SRID.Cursor_UnsupportedFormat , cursorFile)); } } ////// Cursor from Stream /// /// public Cursor(Stream cursorStream) { if (cursorStream == null) { throw new ArgumentNullException("cursorStream"); } LoadFromStream(cursorStream); } ////// Cursor from a SafeHandle to an HCURSOR /// /// ////// Critical: Sets _cursorHandle, which is of a SecurityCritical type. (V4 transparency enforcement) /// TreatAsSafe: This code is safe to expose because in the worst case you change cursor for your app /// See SecurityNote on _cursorHandle. /// [SecurityCritical,SecurityTreatAsSafe] [FriendAccessAllowed] //used by ColumnHeader.GetCursor in PresentationFramework internal Cursor(SafeHandle cursorHandle ) { if (! cursorHandle.IsInvalid ) { this._cursorHandle = cursorHandle ; } } ////// Destructor (IDispose pattern) /// ~Cursor() { Dispose(false); } ////// Cleans up the resources allocated by this object. Once called, the cursor /// object is no longer useful. /// public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } ////// Critical: SafeHandle code link demands on dispose. /// TreatAsSafe: Safe to dispose a cursor. /// [SecurityCritical, SecurityTreatAsSafe ] void Dispose(bool disposing) { if ( _cursorHandle != null ) { _cursorHandle.Dispose(); _cursorHandle = null; } } ////// CursorType - Cursor Type Enumeration /// ///internal CursorType CursorType { get { return _cursorType; } } /// /// Handle - HCURSOR Interop /// ////// /// Critical: Returns a SafeHandle, which is a SecurityCritical type in v4. /// See SecurityNote on _cursorHandle. /// internal SafeHandle Handle { [SecurityCritical] get { return _cursorHandle ?? NativeMethods.CursorHandle.GetInvalidCursor(); } } ////// FileName - .ani or .cur files are allowed /// ///internal String FileName { get { return _fileName; } } /// /// Critical: 1) Access to a file. Calls Win32Exception ctor, which LinkDemands. /// Method success/failure could be used to do local file path probing. /// 2) Sets _cursorHandle, which is of a SecurityCritical type. /// TreatAsSafe: 1) We demand FileIOPermission. Then it's okay to throw an exception about any failure. /// 2) Anyone is allowed to set the cursor. See SecurityNote on _cursorHandle. /// [SecurityCritical, SecurityTreatAsSafe] private void LoadFromFile(string fileName) { SecurityHelper.DemandFileIOReadPermission(fileName); // Load a Custom Cursor _cursorHandle = UnsafeNativeMethods.LoadImageCursor(IntPtr.Zero, fileName, NativeMethods.IMAGE_CURSOR, 0, 0, NativeMethods.LR_DEFAULTCOLOR | NativeMethods.LR_LOADFROMFILE); int errorCode = Marshal.GetLastWin32Error(); if (_cursorHandle == null || SecurityHelper.SafeHandleIsInvalid(_cursorHandle)) { // Note: chandras 02/02/2005 // Bug # 1016022: LoadImage returns a null handle but does not set // the error condition when icon file is of an incorrect type (e.g., .bmp) // // LoadImage has a bug where it doesn't set the correct error code // when a file is given that is not an ico file. Icon load fails // but win32 error code is still zero (success). Thus, we need to // special case this scenario. // if (errorCode != 0) { if ((errorCode == NativeMethods.ERROR_FILE_NOT_FOUND) || (errorCode == NativeMethods.ERROR_PATH_NOT_FOUND)) { throw new Win32Exception(errorCode, SR.Get(SRID.Cursor_LoadImageFailure, fileName)); } else { throw new Win32Exception(errorCode); } } else { throw new ArgumentException(SR.Get(SRID.Cursor_LoadImageFailure, fileName)); } } } private const int BUFFERSIZE = 4096; // the maximum size of the buffer used for loading from stream ////// Critical: Sets _cursorHandle, which is of a SecurityCritical type. /// TreatAsSafe: Anyone is allowed to set the cursor. See SecurityNote on _cursorHandle. /// [SecurityCritical, SecurityTreatAsSafe] private void LoadFromStream(Stream cursorStream) { //Generate a temporal file based on the memory stream. // string filePath = Path.GetTempFileName(); try { using (BinaryReader reader = new BinaryReader(cursorStream)) { using (FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Write, FileShare.None)) { // Read the bytes from the stream, up to BUFFERSIZE byte[] cursorData = reader.ReadBytes(BUFFERSIZE); int dataSize; // If the buffer is filled up, then write those bytes out and read more bytes up to BUFFERSIZE for (dataSize = cursorData.Length; dataSize >= BUFFERSIZE; dataSize = reader.Read(cursorData, 0 /*index in array*/, BUFFERSIZE /*bytes to read*/)) { fileStream.Write(cursorData, 0 /*index in array*/, BUFFERSIZE /*bytes to write*/); } // Write any remaining bytes fileStream.Write(cursorData, 0 /*index in array*/, dataSize /*bytes to write*/); } } // This method is called with File Write permission still asserted. // However, this method just reads this file into an icon. _cursorHandle = UnsafeNativeMethods.LoadImageCursor(IntPtr.Zero, filePath, NativeMethods.IMAGE_CURSOR, 0, 0, NativeMethods.LR_DEFAULTCOLOR | NativeMethods.LR_LOADFROMFILE); if (_cursorHandle == null || SecurityHelper.SafeHandleIsInvalid(_cursorHandle)) { throw new ArgumentException(SR.Get(SRID.Cursor_InvalidStream)); } } finally { File.Delete(filePath); } } ////// Critical: Sets _cursorHandle, which is of a SecurityCritical type. /// TreatAsSafe: Anyone is allowed to set the cursor. See SecurityNote on _cursorHandle. /// [SecurityCritical, SecurityTreatAsSafe] private void LoadCursorHelper(CursorType cursorType) { if (cursorType != CursorType.None) { // Load a Standard Cursor _cursorHandle = SafeNativeMethods.LoadCursor(new HandleRef(this,IntPtr.Zero), (IntPtr)(CursorTypes[(int)cursorType])); } this._cursorType = cursorType; } ////// String Output /// public override string ToString() { if (_fileName != String.Empty) return _fileName; else { // Get the string representation fo the cursor type enumeration. return Enum.GetName(typeof(CursorType), _cursorType); } } private bool IsValidCursorType(CursorType cursorType) { return ((int)cursorType >= (int)CursorType.None && (int)cursorType <= (int)CursorType.ArrowCD); } private string _fileName = String.Empty; private CursorType _cursorType = CursorType.None; /// /// In v4, SafeHandle is marked as SecurityCritical. According to the new transparency enforcement model, /// any access to this field must be done from a SecurityCritical method (even though our assemblies still /// use the v2 model). However, we don't consider setting/replacing the cursor a critical operation. /// (Effect is only within the application's UI.) That's why TreatAsSafe methods are allowed to set this /// field. Individual methods on SafeHandle still guard access to the OS handle. /// private SafeHandle _cursorHandle; private static readonly int[] CursorTypes = { 0, // None NativeMethods.IDC_NO, NativeMethods.IDC_ARROW, NativeMethods.IDC_APPSTARTING, NativeMethods.IDC_CROSS, NativeMethods.IDC_HELP, NativeMethods.IDC_IBEAM, NativeMethods.IDC_SIZEALL, NativeMethods.IDC_SIZENESW, NativeMethods.IDC_SIZENS, NativeMethods.IDC_SIZENWSE, NativeMethods.IDC_SIZEWE, NativeMethods.IDC_UPARROW, NativeMethods.IDC_WAIT, NativeMethods.IDC_HAND, NativeMethods.IDC_ARROW + 119, // PenCursor NativeMethods.IDC_ARROW + 140, // ScrollNSCursor NativeMethods.IDC_ARROW + 141, // ScrollWECursor NativeMethods.IDC_ARROW + 142, // ScrollAllCursor NativeMethods.IDC_ARROW + 143, // ScrollNCursor NativeMethods.IDC_ARROW + 144, // ScrollSCursor NativeMethods.IDC_ARROW + 145, // ScrollWCursor NativeMethods.IDC_ARROW + 146, // ScrollECursor NativeMethods.IDC_ARROW + 147, // ScrollNWCursor NativeMethods.IDC_ARROW + 148, // ScrollNECursor NativeMethods.IDC_ARROW + 149, // ScrollSWCursor NativeMethods.IDC_ARROW + 150, // ScrollSECursor NativeMethods.IDC_ARROW + 151 // ArrowCDCursor }; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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