/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
public void Dispose()
{
if (!disposed)
{
disposed = true;
if (handle != null && !handle.IsClosed)
{
handle.Dispose();
handle = null;
}
}
}
internal static extern IntPtr GetProcAddress(SafeLibraryHandle hModule, string lpProcName);
/// <summary>
/// Loads the 8bf filters from the specified file.
/// </summary>
/// <param name="fileName">The plug-in file name.</param>
/// <returns>An enumerable collection containing the filters within the plug-in.</returns>
/// <exception cref="System.ArgumentNullException"><paramref name="fileName"/> is null.</exception>
internal static IEnumerable <PluginData> LoadFiltersFromFile(string fileName)
{
if (fileName == null)
{
throw new ArgumentNullException(nameof(fileName));
}
ProcessorArchitecture platform = PEFile.GetProcessorArchitecture(fileName);
if (!DllProcessorArchtectureIsSupported(platform))
{
// Ignore any DLLs that cannot be used on the current platform.
return(System.Linq.Enumerable.Empty <PluginData>());
}
List <PluginData> pluginData = new List <PluginData>();
// Use LOAD_LIBRARY_AS_DATAFILE to prevent a BadImageFormatException from being thrown if the file is a different processor architecture than the parent process.
using (SafeLibraryHandle dll = UnsafeNativeMethods.LoadLibraryExW(fileName, IntPtr.Zero, NativeConstants.LOAD_LIBRARY_AS_DATAFILE))
{
if (!dll.IsInvalid)
{
QueryFilter queryFilter = new QueryFilter(fileName, platform);
GCHandle handle = GCHandle.Alloc(queryFilter, GCHandleType.Normal);
try
{
IntPtr callback = GCHandle.ToIntPtr(handle);
if (UnsafeNativeMethods.EnumResourceNamesW(dll, "PiPl", new UnsafeNativeMethods.EnumResNameDelegate(EnumPiPL), callback))
{
queryFilter = (QueryFilter)GCHandle.FromIntPtr(callback).Target;
pluginData.AddRange(queryFilter.plugins);
}
else if (UnsafeNativeMethods.EnumResourceNamesW(dll, "PiMI", new UnsafeNativeMethods.EnumResNameDelegate(EnumPiMI), callback))
{
// If there are no PiPL resources scan for Photoshop 2.5's PiMI resources.
queryFilter = (QueryFilter)GCHandle.FromIntPtr(callback).Target;
pluginData.AddRange(queryFilter.plugins);
}
#if DEBUG
else
{
DebugUtils.Ping(DebugFlags.PiPL, string.Format("EnumResourceNames(PiPL, PiMI) failed for {0}", fileName));
}
#endif
}
finally
{
if (handle.IsAllocated)
{
handle.Free();
}
}
}
}
int count = pluginData.Count;
if (count > 1)
{
// If the DLL contains more than one filter, add a list of all the entry points to each individual filter.
// Per the SDK only one entry point in a module will display the about box the rest are dummy calls so we must call all of them.
string[] entryPoints = new string[count];
for (int i = 0; i < count; i++)
{
entryPoints[i] = pluginData[i].EntryPoint;
}
for (int i = 0; i < count; i++)
{
pluginData[i].ModuleEntryPoints = new ReadOnlyCollection <string>(entryPoints);
}
}
return(pluginData);
}