C#：调试器中的 comctl32.dll 版本 6

Question

我正在为 TaskDialog 使用 WindowsAPICodePack 。当我尝试显示该对话框时，它说需要加载 comctl32.dll 的版本 6。所以我将版本 6 添加到 app.manifest 并尝试运行它。还是没有运气。我进入 Debug 文件夹并在没有 Visual Studio 的情况下运行该程序，它工作正常。我猜测 Visual Studio 没有使用清单文件...我想知道是否有办法让它做到这一点。

Answer 1

Robpol86，您的代码抛出 SEHExceptions，因为 ActivateActCtx 和 DeactivateActCtx 的签名不正确。对于 lpCookie，您必须使用 UIntPtr 而不是 uint。

因此，EnableThemingInScope.cs 的正确代码是：

using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Security;
using System.Security.Permissions;
using System.Windows.Forms;

namespace Microsoft.WindowsAPICodePack.Dialogs
{
    /// http://support.microsoft.com/kb/830033
    /// <devdoc>
    ///     This class is intended to use with the C# 'using' statement in
    ///     to activate an activation context for turning on visual theming at
    ///     the beginning of a scope, and have it automatically deactivated
    ///     when the scope is exited.
    /// </devdoc>

    [SuppressUnmanagedCodeSecurity]
    internal class EnableThemingInScope : IDisposable
    {
        // Private data
        private UIntPtr cookie;
        private static ACTCTX enableThemingActivationContext;
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Reliability", "CA2006:UseSafeHandleToEncapsulateNativeResources")]
        private static IntPtr hActCtx;
        private static bool contextCreationSucceeded = false;

        public EnableThemingInScope(bool enable)
        {
            cookie = UIntPtr.Zero;
            if (enable && OSFeature.Feature.IsPresent(OSFeature.Themes))
            {
                if (EnsureActivateContextCreated())
                {
                    if (!ActivateActCtx(hActCtx, out cookie))
                    {
                        // Be sure cookie always zero if activation failed
                        cookie = UIntPtr.Zero;
                    }
                }
            }
        }

        ~EnableThemingInScope()
        {
            Dispose();
        }

        void IDisposable.Dispose()
        {
            Dispose();
            GC.SuppressFinalize(this);
        }

        private void Dispose()
        {
            if (cookie != UIntPtr.Zero)
            {
                try
                {
                    if (DeactivateActCtx(0, cookie))
                    {
                        // deactivation succeeded...
                        cookie = UIntPtr.Zero;
                    }
                }
                catch (SEHException)
                {
                    //Hopefully solved this exception
                }
            }
        }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Reliability", "CA2002:DoNotLockOnObjectsWithWeakIdentity")]
        private static bool EnsureActivateContextCreated()
        {
            lock (typeof(EnableThemingInScope))
            {
                if (!contextCreationSucceeded)
                {
                    // Pull manifest from the .NET Framework install
                    // directory

                    string assemblyLoc = null;

                    FileIOPermission fiop = new FileIOPermission(PermissionState.None);
                    fiop.AllFiles = FileIOPermissionAccess.PathDiscovery;
                    fiop.Assert();
                    try
                    {
                        assemblyLoc = typeof(Object).Assembly.Location;
                    }
                    finally
                    {
                        CodeAccessPermission.RevertAssert();
                    }

                    string manifestLoc = null;
                    string installDir = null;
                    if (assemblyLoc != null)
                    {
                        installDir = Path.GetDirectoryName(assemblyLoc);
                        const string manifestName = "XPThemes.manifest";
                        manifestLoc = Path.Combine(installDir, manifestName);
                    }

                    if (manifestLoc != null && installDir != null)
                    {
                        enableThemingActivationContext = new ACTCTX();
                        enableThemingActivationContext.cbSize = Marshal.SizeOf(typeof(ACTCTX));
                        enableThemingActivationContext.lpSource = manifestLoc;

                        // Set the lpAssemblyDirectory to the install
                        // directory to prevent Win32 Side by Side from
                        // looking for comctl32 in the application
                        // directory, which could cause a bogus dll to be
                        // placed there and open a security hole.
                        enableThemingActivationContext.lpAssemblyDirectory = installDir;
                        enableThemingActivationContext.dwFlags = ACTCTX_FLAG_ASSEMBLY_DIRECTORY_VALID;

                        // Note this will fail gracefully if file specified
                        // by manifestLoc doesn't exist.
                        hActCtx = CreateActCtx(ref enableThemingActivationContext);
                        contextCreationSucceeded = (hActCtx != new IntPtr(-1));
                    }
                }

                // If we return false, we'll try again on the next call into
                // EnsureActivateContextCreated(), which is fine.
                return contextCreationSucceeded;
            }
        }

        // All the pinvoke goo...
        [DllImport("Kernel32.dll")]
        private extern static IntPtr CreateActCtx(ref ACTCTX actctx);
        [DllImport("Kernel32.dll")]
        private extern static bool ActivateActCtx(IntPtr hActCtx, out UIntPtr lpCookie);
        [DllImport("Kernel32.dll")]
        private extern static bool DeactivateActCtx(uint dwFlags, UIntPtr lpCookie);

        private const int ACTCTX_FLAG_ASSEMBLY_DIRECTORY_VALID = 0x004;

        private struct ACTCTX
        {
            public int cbSize;
            public uint dwFlags;
            public string lpSource;
            public ushort wProcessorArchitecture;
            public ushort wLangId;
            public string lpAssemblyDirectory;
            public string lpResourceName;
            public string lpApplicationName;
        }
    }
}

Answer 2

我最近在使用 CodePack 中的 TaskDialogDemo 调试代码时遇到了这个问题。这就是我修复它的方法。使用这个的问题是，如果我打开两个或三个对话框，它会抛出一个 SEHException，我还没有弄清楚如何修复。所以买家要小心。

添加 Core\Interop\TaskDialogs\EnableThemingInScope.cs：

using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Security;
using System.Security.Permissions;
using System.Windows.Forms;

namespace Microsoft.WindowsAPICodePack.Dialogs {
    /// http://support.microsoft.com/kb/830033
    /// <devdoc>
    ///     This class is intended to use with the C# 'using' statement in
    ///     to activate an activation context for turning on visual theming at
    ///     the beginning of a scope, and have it automatically deactivated
    ///     when the scope is exited.
    /// </devdoc>

    [SuppressUnmanagedCodeSecurity]
    internal class EnableThemingInScope : IDisposable {
        // Private data
        private uint cookie;
        private static ACTCTX enableThemingActivationContext;
        [System.Diagnostics.CodeAnalysis.SuppressMessage( "Microsoft.Reliability", "CA2006:UseSafeHandleToEncapsulateNativeResources" )]
        private static IntPtr hActCtx;
        private static bool contextCreationSucceeded = false;

        public EnableThemingInScope( bool enable ) {
            cookie = 0;
            if ( enable && OSFeature.Feature.IsPresent( OSFeature.Themes ) ) {
                if ( EnsureActivateContextCreated() ) {
                    if ( !ActivateActCtx( hActCtx, out cookie ) ) {
                        // Be sure cookie always zero if activation failed
                        cookie = 0;
                    }
                }
            }
        }

        ~EnableThemingInScope() {
            Dispose();
        }

        void IDisposable.Dispose() {
            Dispose();
            GC.SuppressFinalize( this );
        }

        private void Dispose() {
            if ( cookie != 0 ) {
                try {
                    if ( DeactivateActCtx( 0, cookie ) ) {
                        // deactivation succeeded...
                        cookie = 0;
                    }
                } catch ( SEHException ) {
                    // Robpol86: I don't know how to fix this!
                }
            }
        }

        [System.Diagnostics.CodeAnalysis.SuppressMessage( "Microsoft.Reliability", "CA2002:DoNotLockOnObjectsWithWeakIdentity" )]
        private static bool EnsureActivateContextCreated() {
            lock ( typeof( EnableThemingInScope ) ) {
                if ( !contextCreationSucceeded ) {
                    // Pull manifest from the .NET Framework install
                    // directory

                    string assemblyLoc = null;

                    FileIOPermission fiop = new FileIOPermission( PermissionState.None );
                    fiop.AllFiles = FileIOPermissionAccess.PathDiscovery;
                    fiop.Assert();
                    try {
                        assemblyLoc = typeof( Object ).Assembly.Location;
                    } finally {
                        CodeAccessPermission.RevertAssert();
                    }

                    string manifestLoc = null;
                    string installDir = null;
                    if ( assemblyLoc != null ) {
                        installDir = Path.GetDirectoryName( assemblyLoc );
                        const string manifestName = "XPThemes.manifest";
                        manifestLoc = Path.Combine( installDir, manifestName );
                    }

                    if ( manifestLoc != null && installDir != null ) {
                        enableThemingActivationContext = new ACTCTX();
                        enableThemingActivationContext.cbSize = Marshal.SizeOf( typeof( ACTCTX ) );
                        enableThemingActivationContext.lpSource = manifestLoc;

                        // Set the lpAssemblyDirectory to the install
                        // directory to prevent Win32 Side by Side from
                        // looking for comctl32 in the application
                        // directory, which could cause a bogus dll to be
                        // placed there and open a security hole.
                        enableThemingActivationContext.lpAssemblyDirectory = installDir;
                        enableThemingActivationContext.dwFlags = ACTCTX_FLAG_ASSEMBLY_DIRECTORY_VALID;

                        // Note this will fail gracefully if file specified
                        // by manifestLoc doesn't exist.
                        hActCtx = CreateActCtx( ref enableThemingActivationContext );
                        contextCreationSucceeded = (hActCtx != new IntPtr( -1 ));
                    }
                }

                // If we return false, we'll try again on the next call into
                // EnsureActivateContextCreated(), which is fine.
                return contextCreationSucceeded;
            }
        }

        // All the pinvoke goo...
        [DllImport( "Kernel32.dll" )]
        private extern static IntPtr CreateActCtx( ref ACTCTX actctx );
        [DllImport( "Kernel32.dll" )]
        private extern static bool ActivateActCtx( IntPtr hActCtx, out uint lpCookie );
        [DllImport( "Kernel32.dll" )]
        private extern static bool DeactivateActCtx( uint dwFlags, uint lpCookie );

        private const int ACTCTX_FLAG_ASSEMBLY_DIRECTORY_VALID = 0x004;

        private struct ACTCTX {
            public int cbSize;
            public uint dwFlags;
            public string lpSource;
            public ushort wProcessorArchitecture;
            public ushort wLangId;
            public string lpAssemblyDirectory;
            public string lpResourceName;
            public string lpApplicationName;
        }
    }
}

然后在第 93 行的 Core\Interop\TaskDialogs\NativeTaskDialog.cs 中（上方 HResult hresult = TaskDialogNativeMethods.TaskDialogIndirect ）使该部分看起来像这样（最后你将有三行新行）：

// Here is the way we use "vanilla" P/Invoke to call TaskDialogIndirect().
HResult hresult;
using ( new EnableThemingInScope( true ) ) {
    hresult = TaskDialogNativeMethods.TaskDialogIndirect(
        nativeDialogConfig,
        out selectedButtonId,
        out selectedRadioButtonId,
        out checkBoxChecked );
}

Answer 3

本页介绍如何向项目添加自定义清单，以便告诉 Windows 加载新的 comctl32.dll（版本 6.0）：

• 设置正确的清单版本

您的清单是否对 comctl32.dll 具有正确的依赖关系？您是否嵌入了创建的清单？

Answer 4

我在调试模式下使用 Visual Studio 时遇到同样的问题。到目前为止我还没有找到解决方法，它在发布模式下工作得很好。