BitmapCodecInfo.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / Imaging / BitmapCodecInfo.cs / 1305600 / BitmapCodecInfo.cs
                        
                        
                            //------------------------------------------------------------------------------ 
//  Microsoft Avalon
//  Copyright (c) Microsoft Corporation, All Rights Reserved
//
//  File: BitmapCodecInfo.cs 
//
//----------------------------------------------------------------------------- 
 
using System;
using System.Collections; 
using System.Collections.Generic;
using System.Collections.Specialized;
using System.ComponentModel;
using System.ComponentModel.Design.Serialization; 
using System.Reflection;
using MS.Internal; 
using MS.Win32.PresentationCore; 
using System.Diagnostics;
using System.Globalization; 
using System.Runtime.InteropServices;
using System.Xml;
using System.IO;
using System.Security; 
using System.Security.Permissions;
using System.Windows.Media.Imaging; 
using System.Text; 
using MS.Internal.PresentationCore;                        // SecurityHelper
 
namespace System.Windows.Media.Imaging
{
    #region BitmapCodecInfo
 
    /// 
    /// Codec info for a given Encoder/Decoder 
    ///  
    public abstract class BitmapCodecInfo
    { 
        #region Constructors

        /// 
        /// Constructor 
        /// 
        protected BitmapCodecInfo() 
        { 
        }
 
        /// 
        /// Internal Constructor
        /// 
        internal BitmapCodecInfo(SafeMILHandle codecInfoHandle) 
        {
            Debug.Assert(codecInfoHandle != null); 
            _isBuiltIn = true; 
            _codecInfoHandle = codecInfoHandle;
        } 

        #endregion

        #region Public Properties 

        ///  
        /// Container format 
        /// 
        ///  
        ///     Callers must have RegistryPermission(PermissionState.Unrestricted) to call this API.
        /// 
        /// 
        /// Critical - calls unamanged code to retrieve data 
        /// PublicOK - Demands registry permissions
        ///  
        public virtual Guid ContainerFormat 
        {
            [SecurityCritical] 
            get
            {
                SecurityHelper.DemandRegistryPermission();
 
                EnsureBuiltIn();
 
                Guid containerFormat; 

                HRESULT.Check(UnsafeNativeMethods.WICBitmapCodecInfo.GetContainerFormat( 
                    _codecInfoHandle,
                    out containerFormat
                    ));
 
                return containerFormat;
            } 
        } 

        ///  
        /// Author
        /// 
        /// 
        ///     Callers must have RegistryPermission(PermissionState.Unrestricted) to call this API. 
        /// 
        ///  
        /// Critical - calls unamanged code to retrieve data 
        /// PublicOK - Demands registry permissions
        ///  
        public virtual string Author
        {
            [SecurityCritical]
            get 
            {
                SecurityHelper.DemandRegistryPermission(); 
 
                EnsureBuiltIn();
 
                StringBuilder author = null;
                UInt32 length = 0;

                // Find the length of the string needed 
                HRESULT.Check(UnsafeNativeMethods.WICComponentInfo.GetAuthor(
                    _codecInfoHandle, 
                    0, 
                    author,
                    out length 
                    ));

                Debug.Assert(length >= 0);
 
                // get the string back
                if (length > 0) 
                { 
                    author = new StringBuilder((int)length);
 
                    HRESULT.Check(UnsafeNativeMethods.WICComponentInfo.GetAuthor(
                        _codecInfoHandle,
                        length,
                        author, 
                        out length
                        )); 
                } 

                if (author != null) 
                    return author.ToString();
                else
                    return String.Empty;
            } 
        }
 
        ///  
        /// Version
        ///  
        /// 
        ///     Callers must have RegistryPermission(PermissionState.Unrestricted) to call this API.
        /// 
        ///  
        /// Critical - calls unamanged code to retrieve data
        /// PublicOK - Demands registry permissions 
        ///  
        public virtual System.Version Version
        { 
            [SecurityCritical]
            get
            {
                SecurityHelper.DemandRegistryPermission(); 

                EnsureBuiltIn(); 
 
                StringBuilder version = null;
                UInt32 length = 0; 

                // Find the length of the string needed
                HRESULT.Check(UnsafeNativeMethods.WICComponentInfo.GetVersion(
                    _codecInfoHandle, 
                    0,
                    version, 
                    out length 
                    ));
 
                Debug.Assert(length >= 0);

                // get the string back
                if (length > 0) 
                {
                    version = new StringBuilder((int)length); 
 
                    HRESULT.Check(UnsafeNativeMethods.WICComponentInfo.GetVersion(
                        _codecInfoHandle, 
                        length,
                        version,
                        out length
                        )); 
                }
 
                if (version != null) 
                    return new Version(version.ToString());
                else 
                    return new Version();
            }
        }
 
        /// 
        /// Spec Version 
        ///  
        /// 
        ///     Callers must have RegistryPermission(PermissionState.Unrestricted) to call this API. 
        /// 
        /// 
        /// Critical - calls unamanged code to retrieve data
        /// PublicOK - Demands registry permissions 
        /// 
        public virtual Version SpecificationVersion 
        { 
            [SecurityCritical]
            get 
            {
                SecurityHelper.DemandRegistryPermission();

                EnsureBuiltIn(); 

                StringBuilder specVersion = null; 
                UInt32 length = 0; 

                // Find the length of the string needed 
                HRESULT.Check(UnsafeNativeMethods.WICComponentInfo.GetSpecVersion(
                    _codecInfoHandle,
                    0,
                    specVersion, 
                    out length
                    )); 
 
                Debug.Assert(length >= 0);
 
                // get the string back
                if (length > 0)
                {
                    specVersion = new StringBuilder((int)length); 

                    HRESULT.Check(UnsafeNativeMethods.WICComponentInfo.GetSpecVersion( 
                        _codecInfoHandle, 
                        length,
                        specVersion, 
                        out length
                        ));
                }
 
                if (specVersion != null)
                    return new Version(specVersion.ToString()); 
                else 
                    return new Version();
            } 
        }

        /// 
        /// Friendly Name 
        /// 
        ///  
        ///     Callers must have RegistryPermission(PermissionState.Unrestricted) to call this API. 
        /// 
        ///  
        /// Critical - calls unamanged code to retrieve data
        /// PublicOK - Demands registry permissions
        /// 
        public virtual string FriendlyName 
        {
            [SecurityCritical] 
            get 
            {
                SecurityHelper.DemandRegistryPermission(); 

                EnsureBuiltIn();

                StringBuilder friendlyName = null; 
                UInt32 length = 0;
 
                // Find the length of the string needed 
                HRESULT.Check(UnsafeNativeMethods.WICComponentInfo.GetFriendlyName(
                    _codecInfoHandle, 
                    0,
                    friendlyName,
                    out length
                    )); 

                Debug.Assert(length >= 0); 
 
                // get the string back
                if (length > 0) 
                {
                    friendlyName = new StringBuilder((int)length);

                    HRESULT.Check(UnsafeNativeMethods.WICComponentInfo.GetFriendlyName( 
                        _codecInfoHandle,
                        length, 
                        friendlyName, 
                        out length
                        )); 
                }

                if (friendlyName != null)
                    return friendlyName.ToString(); 
                else
                    return String.Empty; 
            } 
        }
 
        /// 
        /// Device Manufacturer
        /// 
        ///  
        ///     Callers must have RegistryPermission(PermissionState.Unrestricted) to call this API.
        ///  
        ///  
        /// Critical - calls unamanged code to retrieve data
        /// PublicOK - Demands registry permissions 
        /// 
        public virtual string DeviceManufacturer
        {
            [SecurityCritical] 
            get
            { 
                SecurityHelper.DemandRegistryPermission(); 

                EnsureBuiltIn(); 

                StringBuilder deviceManufacturer = null;
                UInt32 length = 0;
 
                // Find the length of the string needed
                HRESULT.Check(UnsafeNativeMethods.WICBitmapCodecInfo.GetDeviceManufacturer( 
                    _codecInfoHandle, 
                    0,
                    deviceManufacturer, 
                    out length
                    ));

                Debug.Assert(length >= 0); 

                // get the string back 
                if (length > 0) 
                {
                    deviceManufacturer = new StringBuilder((int)length); 

                    HRESULT.Check(UnsafeNativeMethods.WICBitmapCodecInfo.GetDeviceManufacturer(
                        _codecInfoHandle,
                        length, 
                        deviceManufacturer,
                        out length 
                        )); 
                }
 
                if (deviceManufacturer != null)
                    return deviceManufacturer.ToString();
                else
                    return String.Empty; 
            }
        } 
 
        /// 
        /// Device Models 
        /// 
        /// 
        ///     Callers must have RegistryPermission(PermissionState.Unrestricted) to call this API.
        ///  
        /// 
        /// Critical - calls unamanged code to retrieve data 
        /// PublicOK - Demands registry permissions 
        /// 
        public virtual string DeviceModels 
        {
            [SecurityCritical]
            get
            { 
                SecurityHelper.DemandRegistryPermission();
 
                EnsureBuiltIn(); 

                StringBuilder deviceModels = null; 
                UInt32 length = 0;

                // Find the length of the string needed
                HRESULT.Check(UnsafeNativeMethods.WICBitmapCodecInfo.GetDeviceModels( 
                    _codecInfoHandle,
                    0, 
                    deviceModels, 
                    out length
                    )); 

                Debug.Assert(length >= 0);

                // get the string back 
                if (length > 0)
                { 
                    deviceModels = new StringBuilder((int)length); 

                    HRESULT.Check(UnsafeNativeMethods.WICBitmapCodecInfo.GetDeviceModels( 
                        _codecInfoHandle,
                        length,
                        deviceModels,
                        out length 
                        ));
                } 
 
                if (deviceModels != null)
                    return deviceModels.ToString(); 
                else
                    return String.Empty;
            }
        } 

        ///  
        /// Mime types 
        /// 
        ///  
        ///     Callers must have RegistryPermission(PermissionState.Unrestricted) to call this API.
        /// 
        /// 
        /// Critical - calls unamanged code to retrieve data 
        /// PublicOK - Demands registry permissions
        ///  
        public virtual string MimeTypes 
        {
            [SecurityCritical] 
            get
            {
                SecurityHelper.DemandRegistryPermission();
 
                EnsureBuiltIn();
 
                StringBuilder mimeTypes = null; 
                UInt32 length = 0;
 
                // Find the length of the string needed
                HRESULT.Check(UnsafeNativeMethods.WICBitmapCodecInfo.GetMimeTypes(
                    _codecInfoHandle,
                    0, 
                    mimeTypes,
                    out length 
                    )); 

                Debug.Assert(length >= 0); 

                // get the string back
                if (length > 0)
                { 
                    mimeTypes = new StringBuilder((int)length);
 
                    HRESULT.Check(UnsafeNativeMethods.WICBitmapCodecInfo.GetMimeTypes( 
                        _codecInfoHandle,
                        length, 
                        mimeTypes,
                        out length
                        ));
                } 

                if (mimeTypes != null) 
                    return mimeTypes.ToString(); 
                else
                    return String.Empty; 
            }
        }

        ///  
        /// File extensions
        ///  
        ///  
        ///     Callers must have RegistryPermission(PermissionState.Unrestricted) to call this API.
        ///  
        /// 
        /// Critical - calls unamanged code to retrieve data
        /// PublicOK - Demands registry permissions
        ///  
        public virtual string FileExtensions
        { 
            [SecurityCritical] 
            get
            { 
                SecurityHelper.DemandRegistryPermission();

                EnsureBuiltIn();
 
                StringBuilder fileExtensions = null;
                UInt32 length = 0; 
 
                // Find the length of the string needed
                HRESULT.Check(UnsafeNativeMethods.WICBitmapCodecInfo.GetFileExtensions( 
                    _codecInfoHandle,
                    0,
                    fileExtensions,
                    out length 
                    ));
 
                Debug.Assert(length >= 0); 

                // get the string back 
                if (length > 0)
                {
                    fileExtensions = new StringBuilder((int)length);
 
                    HRESULT.Check(UnsafeNativeMethods.WICBitmapCodecInfo.GetFileExtensions(
                        _codecInfoHandle, 
                        length, 
                        fileExtensions,
                        out length 
                        ));
                }

                if (fileExtensions != null) 
                    return fileExtensions.ToString();
                else 
                    return String.Empty; 
            }
        } 

        /// 
        /// Does Support Animation
        ///  
        /// 
        ///     Callers must have RegistryPermission(PermissionState.Unrestricted) to call this API. 
        ///  
        /// 
        /// Critical - calls unamanged code to retrieve data 
        /// PublicOK - Demands registry permissions
        /// 
        public virtual bool SupportsAnimation
        { 
            [SecurityCritical]
            get 
            { 
                SecurityHelper.DemandRegistryPermission();
 
                EnsureBuiltIn();

                bool supportsAnimation;
 
                HRESULT.Check(UnsafeNativeMethods.WICBitmapCodecInfo.DoesSupportAnimation(
                    _codecInfoHandle, 
                    out supportsAnimation 
                    ));
 
                return supportsAnimation;
            }
        }
 
        /// 
        /// Does Support Lossless 
        ///  
        /// 
        ///     Callers must have RegistryPermission(PermissionState.Unrestricted) to call this API. 
        /// 
        /// 
        /// Critical - calls unamanged code to retrieve data
        /// PublicOK - Demands registry permissions 
        /// 
        public virtual bool SupportsLossless 
        { 
            [SecurityCritical]
            get 
            {
                SecurityHelper.DemandRegistryPermission();

                EnsureBuiltIn(); 

                bool supportsLossless; 
 
                HRESULT.Check(UnsafeNativeMethods.WICBitmapCodecInfo.DoesSupportLossless(
                    _codecInfoHandle, 
                    out supportsLossless
                    ));

                return supportsLossless; 
            }
        } 
 
        /// 
        /// Does Support Multiple Frames 
        /// 
        /// 
        ///     Callers must have RegistryPermission(PermissionState.Unrestricted) to call this API.
        ///  
        /// 
        /// Critical - calls unamanged code to retrieve data 
        /// PublicOK - Demands registry permissions 
        /// 
        public virtual bool SupportsMultipleFrames 
        {
            [SecurityCritical]
            get
            { 
                SecurityHelper.DemandRegistryPermission();
 
                EnsureBuiltIn(); 

                bool supportsMultiFrame; 

                HRESULT.Check(UnsafeNativeMethods.WICBitmapCodecInfo.DoesSupportMultiframe(
                    _codecInfoHandle,
                    out supportsMultiFrame 
                    ));
 
                return supportsMultiFrame; 
            }
        } 

        #endregion

        #region Private Methods 

        private void EnsureBuiltIn() 
        { 
            if (!_isBuiltIn)
            { 
                throw new NotImplementedException();
            }
        }
 
        #endregion
 
        #region Data Members 

        /// is this a built in codec info? 
        private bool _isBuiltIn;

        /// Codec info handle
        SafeMILHandle _codecInfoHandle; 

        #endregion 
    } 

    #endregion 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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