private static IClassFactory GetClassFactoryFromDll(string dllName, string filterPersistClass)
{
//Load the dll
IntPtr dllHandle=Win32NativeMethods.LoadLibrary(dllName);
if (dllHandle==IntPtr.Zero)
return null;
//Keep a reference to the dll until the process\AppDomain dies
_dllList.AddDllHandle(dllHandle);
//Get a pointer to the DllGetClassObject function
IntPtr dllGetClassObjectPtr=Win32NativeMethods.GetProcAddress(dllHandle, "DllGetClassObject");
if (dllGetClassObjectPtr==IntPtr.Zero)
return null;
//Convert the function pointer to a .net delegate
DllGetClassObject dllGetClassObject=(DllGetClassObject)Marshal.GetDelegateForFunctionPointer(dllGetClassObjectPtr, typeof(DllGetClassObject));
//Call the DllGetClassObject to retreive a class factory for out Filter class
Guid filterPersistGUID=new Guid(filterPersistClass);
Guid IClassFactoryGUID=new Guid("00000001-0000-0000-C000-000000000046"); //IClassFactory class id
Object unk;
if (dllGetClassObject(ref filterPersistGUID, ref IClassFactoryGUID, out unk)!=0)
return null;
//Yippie! cast the returned object to IClassFactory
return (unk as IClassFactory);
}
/// <summary>
/// Gets a class factory for a specific COM Class ID.
/// </summary>
/// <param name="dllName">The dll where the COM class is implemented.</param>
/// <param name="filterPersistClass">The requested Class ID.</param>
/// <returns>IClassFactory instance used to create instances of that class.</returns>
internal static IClassFactory GetClassFactory(string dllName, Guid filterPersistClass)
{
// Load the class factory from the dll.
// By specifying the flags we allow to search for dependencies in the same folder as the file to be loaded
// as well as default dirs like System32 and the Application folder.
IntPtr dllHandle = Utilities.SystemAPI.NativeMethods.LoadLibraryEx(dllName, IntPtr.Zero,
Utilities.SystemAPI.NativeMethods.LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR | Utilities.SystemAPI.NativeMethods.LOAD_LIBRARY_SEARCH_DEFAULT_DIRS);
if (dllHandle == IntPtr.Zero)
{
return(null);
}
// Keep a reference to the dll until the process\AppDomain dies.
DLL_LIST.AddDllHandle(dllHandle);
//Get a pointer to the DllGetClassObject function
IntPtr dllGetClassObjectPtr = Utilities.SystemAPI.NativeMethods.GetProcAddress(dllHandle, "DllGetClassObject");
if (dllGetClassObjectPtr == IntPtr.Zero)
{
return(null);
}
// Convert the function pointer to a .net delegate.
DllGetClassObject dllGetClassObject = (DllGetClassObject)Marshal.GetDelegateForFunctionPointer(dllGetClassObjectPtr, typeof(DllGetClassObject));
// Call the DllGetClassObject to retreive a class factory for out Filter class.
Guid baseFilterGuid = filterPersistClass;
Guid classFactoryGuid = typeof(IClassFactory).GUID;
Object unk;
if (dllGetClassObject(ref baseFilterGuid, ref classFactoryGuid, out unk) != 0)
{
return(null);
}
return(unk as IClassFactory);
}
private static IClassFactory GetClassFactoryFromDll(string dllName, string filterPersistClass)
{
IntPtr dllHandle = Win32NativeMethods.LoadLibrary(dllName);
if (dllHandle == IntPtr.Zero)
{
return(null);
}
_dllList.AddDllHandle(dllHandle);
IntPtr dllGetClassObjectPtr = Win32NativeMethods.GetProcAddress(dllHandle, "DllGetClassObject");
if (dllGetClassObjectPtr == IntPtr.Zero)
{
return(null);
}
DllGetClassObject dllGetClassObject = (DllGetClassObject)Marshal.GetDelegateForFunctionPointer(dllGetClassObjectPtr, typeof(DllGetClassObject));
Guid filterPersistGUID = new Guid(filterPersistClass);
Guid IClassFactoryGUID = new Guid("00000001-0000-0000-C000-000000000046");
Object unk;
if (dllGetClassObject(ref filterPersistGUID, ref IClassFactoryGUID, out unk) != 0)
{
return(null);
}
return(unk as IClassFactory);
}
