C intptr null

Active Oldest Votes. IntPtr is a value type and cannot be null. SLaks SLaks k gold badges silver badges bronze badges.

If you want to specify the default value for a parameter, IntPtr. Jaycee Jaycee 3, 18 18 silver badges 31 31 bronze badges. You can use IntPtr. Zero for null, however it's not equivalent to C null value. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.

Post as a guest Name. Use this field to efficiently determine whether an instance of IntPtr has been set to a value other than zero. For example, assume the variable, ip, is an instance of IntPtr. You can determine if it has been set by comparing it to the value returned by a constructor, for example: " if ip! However, invoking a constructor to get an uninitialized pointer is inefficient.

It is better to code either " if ip! Equals ip Zero instead of null if an argument is expected to be either a pointer or a null. Zero for the pSecurityAttributes and hTemplateFile argument values.

Common Language Runtime Internals and Architecture. NET, including security, performance, hosting, base classes, interop, reliability, debugging, GC, and profiling.

Sign in to vote. Zero , or does it fill an IntPtr variable with a random number? Thursday, April 16, PM. Zero on the managed side. Mattias, C MVP. BTW: Easy way how to get your answer quickly is it to try it on a small example Using IntPtr.

Tuesday, April 28, PM. Function calls among languages that use null pointer values for error checking should be interpreted correctly. You cannot initialize a handle to zero; only nullptr can be used. The following code example demonstrates that the nullptr keyword can be used wherever a handle, native pointer, or function argument can be used.

And the example demonstrates that the nullptr keyword can be used to check a reference before it is used. The following code example shows that nullptr and zero can be used interchangeably on native pointers.

The following code example shows that nullptr is interpreted as a handle to any type or a native pointer to any type. In case of function overloading with handles to different types, an ambiguity error will be generated. The nullptr would have to be explicitly cast to a type.