TemporaryBitmapFile.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / MIT / System / Web / UI / MobileControls / Design / Util / TemporaryBitmapFile.cs / 1305376 / TemporaryBitmapFile.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI.Design.MobileControls.Util 
{ 
    using System;
    using System.Diagnostics; 
    using System.Drawing;
    using System.Drawing.Imaging;
    using System.IO;
 
    /// 
    ///    This class encapsulates a bitmap and a file that represents 
    ///    the bitmap on disk.  It would have been cleaner to subclass 
    ///    bitmap, but the bitmap class is sealed.
    ///  
    [
        System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand,
        Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)
    ] 
    [Obsolete("The System.Web.Mobile.dll assembly has been deprecated and should no longer be used. For information about how to develop ASP.NET mobile applications, see http://go.microsoft.com/fwlink/?LinkId=157231.")]
    internal class TemporaryBitmapFile : IDisposable 
    { 
        private String _path;
        private Bitmap _bitmap; 

        internal TemporaryBitmapFile(Bitmap bitmap)
        {
            Debug.Assert(bitmap != null, 
                "You must provide a valid bitmap object."
            ); 
            _bitmap = bitmap; 
            _path = Path.GetTempPath() + Guid.NewGuid().ToString() + ".bmp";
            [....](); 
        }

        public void Dispose()
        { 
            if(_bitmap != null)
            { 
                _bitmap.Dispose(); 
                _bitmap = null;
            } 
            if(_path != null)
            {
                FileAttributes fa = File.GetAttributes(_path);
                File.SetAttributes(_path, fa & ~FileAttributes.ReadOnly); 
                File.Delete(_path);
                _path = null; 
            } 
        }
 
        private void [....]()
        {
            FileAttributes fa;
 
            if(File.Exists(_path))
            { 
                fa = File.GetAttributes(_path); 
                File.SetAttributes(_path, fa & ~FileAttributes.ReadOnly);
            } 

            _bitmap.Save(_path, ImageFormat.Bmp);

            // If the file did not exist previously, fa will not be valid. 
            fa = File.GetAttributes(_path);
            File.SetAttributes(_path,  fa | FileAttributes.ReadOnly); 
        } 

        internal String Url 
        {
            get
            {
                return "file:///" + _path; 
            }
        } 
 
        internal Bitmap UnderlyingBitmap
        { 
            get
            {
                return _bitmap;
            } 
            set
            { 
                Debug.Assert(value != null, 
                    "Do not set UnderlyingBitmap to null.  Instead, "+
                    "dispose of this object and create a new one later if " + 
                    "neccessary.  (A zero sized bmp can not be written to disk)"
                );
                if(_bitmap != null)
                { 
                    _bitmap.Dispose();
                } 
                _bitmap = value; 
                [....]();
            } 
        }
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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