I'm probably missing something very basic here, but I didn't see any obvious answers in the API documentation.

I want to write to an existing resource I have open. Size is fine, I just want to change the data already stored there.

I open it using DmGetResource and lock it using MemHandleLock to get a pointer. The data is there, I can read it fine.

As soon as I put something in where that pointer is, I get "Fatal Exception".

So presumably I'm going about this in the wrong way? Advice?


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