What is a GCHandle?
Remarks. The GCHandle structure is used with the GCHandleType enumeration to create a handle corresponding to any managed object. When the handle has been allocated, you can use it to prevent the managed object from being collected by the garbage collector when an unmanaged client holds the only reference.
What is GCHandle in c#?
Synopsis. This class is used when you need to pass a managed object to unmanaged code. Normal , which ensures that the object will not be freed by the garbage collector. (This means that some kind of user code must also call the Free() method in order to release the object.)
What is unsafe code what are the properties of unsafe code?
Unsafe is a C# programming language keyword to denote a section of code that is not managed by the Common Language Runtime (CLR) of the . NET Framework, or unmanaged code. However, using the unsafe keyword, you can define an unsafe context in which pointers can be used.
How do I check if an IntPtr is null?
You can also test for a null return value from Windows API function calls that return either a pointer or a null by comparing the returned value with IntPtr. Zero. For example, the call to the GetWindow function in the following example tries to retrieve the handle of a non-existent window.
How to add a gchandle to an object?
Methods Addr OfPinned Object () Retrieves the address of object data in Alloc (Object) Allocates a Normal handle for the specif Alloc (Object, GCHandle Type) Allocates a handle of the specified type Equals (Object) Determines whether the specified GCHandl Free () Releases a GCHandle.
How is the value of a gchandle stored?
Returns a value indicating whether two GCHandle objects are equal. A GCHandle is stored using an internal integer representation. A GCHandle is stored using an internal integer representation. Returns a value indicating whether two GCHandle objects are not equal.
How does the enumwindows method in gchandle work?
A call to the EnumWindows method passes a delegate and a managed object (both declared as managed types, but not shown), and casts the handle to an IntPtr. The unmanaged function passes the type back to the caller as a parameter of the callback function.
Are there any warranties for the use of gchandle?
Microsoft makes no warranties, express or implied, with respect to the information provided here. Provides a way to access a managed object from unmanaged memory. The following example shows an App class that creates a handle to a managed object using the GCHandle.Alloc method, which prevents the managed object from being collected.
