/// <summary>
/// Unloads the private AppDomain and the wkhtmltopdf library, and if applicable, destroys
/// the synchronization thread.
/// </summary>
/// <param name="sender">Typically a null value, not used in the method.</param>
/// <param name="e">Typically EventArgs.Empty, not used in the method.</param>
private static void TearDownAppDomain(object sender, EventArgs e)
{
if (Factory.operatingDomain != null)
{
Func<object> del = () =>
{
Factory.operatingDomain.DoCallBack(() => PechkinBindings.wkhtmltopdf_deinit());
return null;
};
Factory.invocationDelegate.DynamicInvoke(del);
AppDomain.Unload(Factory.operatingDomain);
foreach (ProcessModule module in Process.GetCurrentProcess().Modules)
{
if (module.ModuleName == PechkinBindings.LibFilename)
{
while (PechkinBindings.FreeLibrary(module.BaseAddress))
{
}
}
}
Factory.operatingDomain = null;
}
if (Factory.synchronizer != null)
{
Factory.synchronizer.Terminate();
Factory.synchronizer = null;
}
}
/// <summary>
/// Creates and initializes a private AppDomain and therein loads and initializes the
/// wkhtmltopdf library. Attaches to the current AppDomain's DomainUnload event in IIS environments
/// to ensure that on re-deploy, the library is freed so the new AppDomain will be able to use it.
/// </summary>
private static void SetupAppDomain()
{
if (Factory.useSync)
{
Factory.synchronizer = new SynchronizedDispatcherThread();
}
String binPath = String.Empty;
if (!String.IsNullOrEmpty(AppDomain.CurrentDomain.RelativeSearchPath))
{
String[] paths = AppDomain.CurrentDomain.RelativeSearchPath.Split(';');
for (var i = 0; i < paths.Length; i++)
{
paths[i].Remove(0, AppDomain.CurrentDomain.BaseDirectory.Length);
}
binPath = String.Join(";", paths);
}
Factory.operatingDomain = AppDomain.CreateDomain("pechkin_internal_domain", null,
new AppDomainSetup
{
ApplicationBase = AppDomain.CurrentDomain.BaseDirectory,
// Sometimes, like in a web app, your bin folder is not the same
// as the base dir.
PrivateBinPath = binPath
});
if (binPath != String.Empty)
{
Factory.operatingDomain.SetData("assemblyLocation", Assembly.GetExecutingAssembly().Location);
Factory.operatingDomain.DoCallBack(() =>
{
String location = AppDomain.CurrentDomain.GetData("assemblyLocation").ToString();
String filename = System.IO.Path.GetFileName(location);
List<String> paths = new List<String>(AppDomain.CurrentDomain.RelativeSearchPath.Split(';'));
foreach (String path in paths.ToArray())
{
paths.Remove(path);
paths.AddRange(System.IO.Directory.GetFiles(path, filename));
}
Assembly.LoadFrom(paths[0]);
AppDomain.CurrentDomain.SetData("assemblyLocation", paths[0]);
});
Factory.realAssemblyLocation = Factory.operatingDomain.GetData("assemblyLocation").ToString();
}
else
{
Factory.operatingDomain.Load(Assembly.GetExecutingAssembly().FullName);
}
Func<object> del = () =>
{
Factory.operatingDomain.SetData("useX11Graphics", Factory.useX11Graphics);
Factory.operatingDomain.DoCallBack(() =>
{
PechkinBindings.wkhtmltopdf_init((bool)AppDomain.CurrentDomain.GetData("useX11Graphics") ? 1 : 0);
});
return null;
};
Factory.invocationDelegate.DynamicInvoke(del);
if (AppDomain.CurrentDomain.IsDefaultAppDomain() == false)
{
AppDomain.CurrentDomain.DomainUnload += Factory.TearDownAppDomain;
}
}