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Marshal.GetDelegateForFunctionPointer Method

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Definition

Namespace:
System.Runtime.InteropServices
Assembly:
System.Runtime.InteropServices.dll
Assembly:
mscorlib.dll
Assembly:
netstandard.dll

Overloads

GetDelegateForFunctionPointer(IntPtr, Type)
Obsolete.

Converts an unmanaged function pointer to a delegate.
GetDelegateForFunctionPointer<TDelegate>(IntPtr)

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

GetDelegateForFunctionPointer(IntPtr, Type)

Source:
Marshal.cs
Source:
Marshal.cs
Source:
Marshal.cs

Caution

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

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);
public static Delegate GetDelegateForFunctionPointer (IntPtr ptr, Type t);
[System.Security.SecurityCritical]
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>]
static member GetDelegateForFunctionPointer : nativeint * Type -> Delegate
static member GetDelegateForFunctionPointer : nativeint * Type -> Delegate
[<System.Security.SecurityCritical>]
static member GetDelegateForFunctionPointer : nativeint * Type -> Delegate
Public Shared Function GetDelegateForFunctionPointer (ptr As IntPtr, t As Type) As Delegate

Parameters

ptr
IntPtr

nativeint

The unmanaged function pointer to be converted.

t
Type

The type of the delegate to be returned.

Returns

Delegate

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

Attributes
ObsoleteAttribute SecurityCriticalAttribute

Exceptions

ArgumentException

The t parameter is not a delegate or is generic.

ArgumentNullException

The ptr parameter is null.

-or-

The t parameter is null.

Remarks

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.

ptr is converted to a delegate that invokes the unmanaged method using the default platform calling convention. You can set the calling convention by applying the UnmanagedFunctionPointerAttribute to the delegate.

The GetDelegateForFunctionPointer method has the following restrictions:

  • Generics are not supported in interop scenarios.

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

  • You cannot use this method with function pointers obtained through C++.

Applies to

GetDelegateForFunctionPointer<TDelegate>(IntPtr)

Source:
Marshal.cs
Source:
Marshal.cs
Source:
Marshal.cs

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);
public static TDelegate GetDelegateForFunctionPointer<TDelegate> (IntPtr ptr);
[<System.Security.SecurityCritical>]
static member GetDelegateForFunctionPointer : nativeint -> 'Delegate
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

nativeint

The unmanaged function pointer to convert.

Returns

TDelegate

A instance of the specified delegate type.

Attributes
SecurityCriticalAttribute

Exceptions

ArgumentException

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

ArgumentNullException

The ptr parameter is null.

Remarks

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

ptr is converted to a delegate that invokes the unmanaged method using the default platform calling convention. You can set the calling convention by applying the UnmanagedFunctionPointerAttribute to the delegate.

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

  • Generics are not supported in interop scenarios.

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

  • You cannot use this method with function pointers obtained through C++.

Applies to