convert void* to UIntPtr(windows runtime type)

Question

Hi,

I am developing a WinRT c++ component.

I have  a buffer of type void* and i want get this buffer to a C# metro app.

so i want to change the this void* buffer to windows runtime  type UIntPtr.

how to do this...any sample code really helps.

thanks,

Bhash

Answer 1

*reinterpret_cast<Platform::UIntPtr*>(&myVoidPtr);

The documentation says UIntPtr is a ValueType, so I have to assume that this will work. I can't make any promises though. Even if it works now, the documentation doesn't says anything about it, so it may not in the future.

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It's a good think they aren't checking wait chains to prevent blocking the UI thread for an asynchronous task.

Answer 2

I have tried this code snippet and it does not work.. I am also looking for a way to include a void* pointer within the WinRT component so that I can use it from my C# Metro App. For the first line "*reinterpret_cast<Platform::UIntPtr*>(&myVoidPtr);" , it says "Error: Expected an identifier"

For Line 2 " void* d;" I'm getting Error: signature of member contains native type 'void *'

What error am i making?

Thanks!

public value struct t {
	*reinterpret_cast<Platform::UIntPtr*>(&myVoidPtr);  // Does this work?
	void* d; // Does this work?
	uint32 f;
};

Answer 3

That's just a cast. You can't have a cast by itself, you have to assign it to something:

	Platform::UIntPtr result = *reinterpret_cast<Platform::UIntPtr*>(&myVoidPtr);

or, of course, return it from a method:

return *reinterpret_cast<Platform::UIntPtr*>(&myVoidPtr);

Standard C++ stuff, really.

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Software Engineer, Brainium Studios LLC