private static bool EnsureActivateContextCreated()
{
lock (_contextCreationLock)
{
if (_contextCreationSucceeded)
{
return(_contextCreationSucceeded);
}
const string manifestResourceName = "Ookii.Dialogs.XPThemes.manifest";
string manifestTempFilePath;
using (var manifest = typeof(ComCtlv6ActivationContext).Assembly.GetManifestResourceStream(manifestResourceName))
{
if (manifest is null)
{
throw new InvalidOperationException($"Unable to retrieve {manifestResourceName} embedded resource");
}
manifestTempFilePath = Path.Combine(Path.GetTempPath(), Path.GetRandomFileName());
using (var tempFileStream = new FileStream(manifestTempFilePath, FileMode.CreateNew, FileAccess.ReadWrite,
FileShare.Delete | FileShare.ReadWrite))
{
manifest.CopyTo(tempFileStream);
}
}
_enableThemingActivationContext = new NativeMethods.ACTCTX
{
cbSize = Marshal.SizeOf(typeof(NativeMethods.ACTCTX)),
lpSource = manifestTempFilePath,
};
// Note this will fail gracefully if file specified
// by manifestFilePath doesn't exist.
_activationContext = NativeMethods.CreateActCtx(ref _enableThemingActivationContext);
_contextCreationSucceeded = !_activationContext.IsInvalid;
try
{
File.Delete(manifestTempFilePath);
}
catch (Exception)
{
// We tried to be tidy but something blocked us :(
}
// If we return false, we'll try again on the next call into
// EnsureActivateContextCreated(), which is fine.
return(_contextCreationSucceeded);
}
}
private static bool EnsureActivateContextCreated()
{
lock ( _contextCreationLock )
{
if (!_contextCreationSucceeded)
{
// Pull manifest from the .NET Framework install
// directory
string assemblyLoc = null;
assemblyLoc = typeof(Object).Assembly.Location;
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 NativeMethods.ACTCTX();
_enableThemingActivationContext.cbSize = Marshal.SizeOf(typeof(NativeMethods.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 = NativeMethods.ACTCTX_FLAG_ASSEMBLY_DIRECTORY_VALID;
// Note this will fail gracefully if file specified
// by manifestLoc doesn't exist.
_activationContext = NativeMethods.CreateActCtx(ref _enableThemingActivationContext);
_contextCreationSucceeded = !_activationContext.IsInvalid;
}
}
// If we return false, we'll try again on the next call into
// EnsureActivateContextCreated(), which is fine.
return(_contextCreationSucceeded);
}
}
