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HandleRef (user32)
.
C# Signature:
// NATIVE SUPPORT
HandleRef handle;
Notes:
HandleRef is only needed when there's a chance the Garbage Collector will collect the object the handle refers to.
myFlawedFunction() {
myObject o = new myObject();
IntPtr hWnd = o.handle;
//At this point the GC can run and
//collect myObject o since it's
//"not used" anymore.
Win32.A_Function(hWnd);
}
myCorrectFunction() {
myObject o = new myObject();
IntPtr hWnd = o.handle;
//The GC will not collect "o" here since
//there's a later reference to it.
Win32.A_Function(new HandlRef(o, hWnd));
}
A HandleRef is essentially an IntPtr to a handle and a reference to the object the handle belongs to. Using HandleRef prevents the GC from collecting the object until the native method is done with it.
7/22/2009 9:41:44 AM - -212.251.139.186
An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.
1/13/2008 4:00:13 AM - Damon Carr-72.43.165.29
A HandleRef is essentially an IntPtr to a handle and a reference to the object the handle belongs to. Using HandleRef prevents the GC from collecting the object until the native method is done with it.
7/22/2009 9:41:44 AM - -212.251.139.186
A HandleRef is essentially an IntPtr to a handle and a reference to the object the handle belongs to. Using HandleRef prevents the GC from collecting the object until the native method is done with it.
7/22/2009 9:41:44 AM - -212.251.139.186
A HandleRef is essentially an IntPtr to a handle and a reference to the object the handle belongs to. Using HandleRef prevents the GC from collecting the object until the native method is done with it.
7/22/2009 9:41:44 AM - -212.251.139.186
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