CODEWITHSUNDEEP
c#marshallingunsafe-pointers
Stefan Monov
Stefan Monov

Reputation: 11732

Reinterpreting UInt64 as structure

In my code I'm calculating an UInt64 value, then casting it like this:

return *(Cell*)packedUInt64;

Cell is a struct. Marshal.SizeOf(new Cell()) prints 8, so it should match an UInt64, but the cast above crashes with AccessViolationException. I could probably try safer methods such as Marshal.StructureToPtr, but I'm still wondering where's the error in my code? Maybe an alignment mismatch problem?

Upvotes: 1

Views: 183

Answers (1)

Avner Shahar-Kashtan
Avner Shahar-Kashtan

Reputation: 14700

If I understand you correctly, you're calculating a UInt64 value (how?) and then casting that to a POINTER. You're not actually converting it to a Cell struct, but to a memory location in which this Cell resides. The AccessViolationException, in that case, seems perfectly understandable.

Is this what you're actually trying to do, or did I misunderstand your code?

Upvotes: 2

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