Marshal.GetDelegateForFunctionPointer Marshal.GetDelegateForFunctionPointer Marshal.GetDelegateForFunctionPointer Marshal.GetDelegateForFunctionPointer Method

Definition

Overloads

GetDelegateForFunctionPointer(IntPtr, Type) GetDelegateForFunctionPointer(IntPtr, Type) GetDelegateForFunctionPointer(IntPtr, Type) GetDelegateForFunctionPointer(IntPtr, Type)

Converts an unmanaged function pointer to a delegate.

GetDelegateForFunctionPointer<TDelegate>(IntPtr) GetDelegateForFunctionPointer<TDelegate>(IntPtr) GetDelegateForFunctionPointer<TDelegate>(IntPtr) GetDelegateForFunctionPointer<TDelegate>(IntPtr)

[Supported in the .NET Framework 4.5.1 and later versions]

Converts an unmanaged function pointer to a delegate of a specified type.

GetDelegateForFunctionPointer(IntPtr, Type) GetDelegateForFunctionPointer(IntPtr, Type) GetDelegateForFunctionPointer(IntPtr, Type) GetDelegateForFunctionPointer(IntPtr, Type)

Warning

This API is now obsolete.

Converts an unmanaged function pointer to a delegate.

public:
 static Delegate ^ GetDelegateForFunctionPointer(IntPtr ptr, Type ^ t);
[System.Obsolete("GetDelegateForFunctionPointer(IntPtr, Type) may be unavailable in future releases. Instead, use GetDelegateForFunctionPointer<T>(IntPtr). For more info, go to http://go.microsoft.com/fwlink/?LinkID=296521")]
[System.Security.SecurityCritical]
public static Delegate GetDelegateForFunctionPointer (IntPtr ptr, Type t);
static member GetDelegateForFunctionPointer : nativeint * Type -> Delegate
Public Shared Function GetDelegateForFunctionPointer (ptr As IntPtr, t As Type) As Delegate

Parameters

ptr
IntPtr IntPtr IntPtr IntPtr

The unmanaged function pointer to be converted.

t
Type Type Type Type

The type of the delegate to be returned.

Returns

A delegate instance that can be cast to the appropriate delegate type.

Exceptions

The t parameter is not a delegate or is generic.

The ptr parameter is null.

-or-

The t parameter is null.

Remarks

In versions 1.0 and 1.1 of the .NET Framework, it was possible to pass a delegate representing a managed method to unmanaged code as a function pointer, allowing the unmanaged code to call the managed method through the function pointer. It was also possible for the unmanaged code to pass that function pointer back to the managed code, and the pointer was resolved properly to the underlying managed method.

In the .NET Framework 2.0 and later versions, you can use the GetDelegateForFunctionPointer and GetFunctionPointerForDelegate methods to marshal delegates in both directions. With GetDelegateForFunctionPointer, ptr is imported as a System.IntPtr. A System.IntPtr can be obtained for a managed delegate by calling GetFunctionPointerForDelegate and passed as a parameter; it can then be called from inside the unmanaged method. Note that the parameter marshaler can also marshal function pointers to delegates in the .NET Framework 2.0 and later versions.

The GetDelegateForFunctionPointer method has the following restrictions:

  • Generics are not supported in interop scenarios.

  • You cannot pass an invalid function pointer to this method.

  • You can use this method only for pure unmanaged function pointers.

  • You cannot use this method with function pointers obtained through C++ or from the GetFunctionPointer method.

  • You cannot use this method to create a delegate from a function pointer to another managed delegate.

Security

SecurityCriticalAttribute
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

GetDelegateForFunctionPointer<TDelegate>(IntPtr) GetDelegateForFunctionPointer<TDelegate>(IntPtr) GetDelegateForFunctionPointer<TDelegate>(IntPtr) GetDelegateForFunctionPointer<TDelegate>(IntPtr)

[Supported in the .NET Framework 4.5.1 and later versions]

Converts an unmanaged function pointer to a delegate of a specified type.

public:
generic <typename TDelegate>
 static TDelegate GetDelegateForFunctionPointer(IntPtr ptr);
[System.Security.SecurityCritical]
public static TDelegate GetDelegateForFunctionPointer<TDelegate> (IntPtr ptr);
static member GetDelegateForFunctionPointer : nativeint -> 'Delegate
Public Shared Function GetDelegateForFunctionPointer(Of TDelegate) (ptr As IntPtr) As TDelegate

Type Parameters

TDelegate

The type of the delegate to return.

Parameters

ptr
IntPtr IntPtr IntPtr IntPtr

The unmanaged function pointer to convert.

Returns

TDelegate TDelegate TDelegate TDelegate

A instance of the specified delegate type.

Exceptions

The TDelegate generic parameter is not a delegate, or it is an open generic type.

Remarks

You can use the GetDelegateForFunctionPointer<TDelegate>(IntPtr) and GetFunctionPointerForDelegate<TDelegate>(TDelegate) methods to marshal delegates in both directions.

The GetDelegateForFunctionPointer<TDelegate>(IntPtr) method has the following restrictions:

  • You cannot pass an invalid function pointer to this method.

  • You can use this method only for pure unmanaged function pointers.

  • You cannot use this method with function pointers obtained through C++ or from the GetFunctionPointer method.

  • You cannot use this method to create a delegate from a function pointer to another managed delegate.

Security

SecurityCriticalAttribute
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Applies to