"john conwell" wrote:

> I'm trying to create a DynamicMethod to handle custom marshaling from a
> pointer in memory to managed types. I'm trying to use a DynamicMethod so I
> can template the code for all the custom marshaling and dont have to maintain
> it.
>
> My problem is I cant call Marshal.PtrToStructure in a DynamicMethod. I get
> no exception, the method just exits. Its really odd. I've put debugging
> WriteLine lines in my IL to find exactly what opcode was causing the problem,
> and its the 10th opcode (shown below). It gets to that point, and then
> "poof" (and I dont even believe in poofs in computers, but I cant explain it)
>
> I then dumped my IL to an assembly (via reflection.enit) and opened it in
> Reflector and compared it to the IL that the C# compiler created from my C#
> code that does this. and its EXACTLY the same. I mean the IL for the entire
> method is EXACTLY the same.
>
> Does anyone have an idea? Below is the method def and the first 12 or so
> opcodes, taken from Reflector.
>
> One other thing; the C# method that I based this IL code from is marked as
> unsafe, but I didnt see anything in Reflection.Emit to mark something as
> unsafe.
>
> .method public hidebysig virtual instance void
> SetTraceData_ProcessEventData(void* pData, int32 length) cil managed
> {
> .maxstack 15
> .locals init (
> [0] int32 num,
> [1] native int ptr,
> [2] int32 num2,
> [3] bool flag)
>
> ldc.i4.0
> stloc.0
> ldloca.s ptr
> ldarg.2
> call instance void [mscorlib]System.IntPtr::.ctor(void*)
> ldarg.1
> ldloc.1
> ldtoken int32
> call class [mscorlib]System.Type
> [mscorlib]System.Type::GetTypeFromHandle(valuetype
> [mscorlib]System.RuntimeTypeHandle)
> call object
> [mscorlib]System.Runtime.InteropServices.Marshal::PtrToStructure(native int,
> class [mscorlib]System.Type)
> unbox.any int32
> stfld int32
> [Attenex.Instrumentation]Attenex.Instrumentation.Etw.ProcessEventData::instanceId
> .
> .
> .
> ret