Marshal.GetIUnknownForObjectInContext(Object) 方法
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
如果调用方与托管对象在同一上下文中，则从该对象返回一个 IUnknown 接口。
public:
static IntPtr GetIUnknownForObjectInContext(System::Object ^ o);public static IntPtr GetIUnknownForObjectInContext (object o);[System.Security.SecurityCritical]
public static IntPtr GetIUnknownForObjectInContext (object o);static member GetIUnknownForObjectInContext : obj -> nativeint[<System.Security.SecurityCritical>]
static member GetIUnknownForObjectInContext : obj -> nativeintPublic Shared Function GetIUnknownForObjectInContext (o As Object) As IntPtr参数
- o
- Object
其 IUnknown 接口被请求的对象。
返回
IntPtr
nativeint
指定对象的 IUnknown 指针；如果调用方与指定对象不在同一上下文中，则为 null。
- 属性
示例
以下示例演示如何使用 GetIUnknownForObjectInContext 方法检索IUnknown托管对象的接口。
using System;
using System.Runtime.InteropServices;
class Program
{
static void Run()
{
// Create an int object
int obj = 1;
Console.WriteLine("Calling Marshal.GetIUnknownForObjectInContext...");
// Get the IUnKnown pointer for the Integer object
IntPtr pointer = Marshal.GetIUnknownForObjectInContext(obj);
Console.WriteLine("Calling Marshal.Release...");
// Always call Marshal.Release to decrement the reference count.
Marshal.Release(pointer);
}
static void Main(string[] args)
{
Run();
}
}
Imports System.Runtime.InteropServices
Module Program
Sub Run()
' Dim an Integer object
Dim IntegerObject As Integer = 1
' Dim a pointer
Dim pointer As IntPtr
Console.WriteLine("Calling Marshal.GetIUnknownForObjectInContext...")
' Get the IUnKnown pointer for the Integer object
pointer = Marshal.GetIUnknownForObjectInContext(IntegerObject)
Console.WriteLine("Calling Marshal.Release...")
' Always call Marshal.Release to decrement the reference count.
Marshal.Release(pointer)
End Sub
Sub Main(ByVal args() As String)
Run()
End Sub
End Module
注解
此方法与 相同 GetIUnknownForObject ，只是当调用方与 对象不在同一上下文中时，此方法返回 null 。
