native 64-bit compilation on Win64 and .NET

  • Thread starter Thread starter Dennis Landi
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D

Dennis Landi

Hello,

I have three questions:

1) I have been perusing the MSDN VC++ pages. Everything seems to be geared
towards .NET integration. Will MS continue support natively compiled code
or will they be pushing developers to do everything as "managed" C++?

2) Also, on 32-bit platforms we can call 32-bit unmanaged DLLS from managed
assemblies. On Win64 will a 64-bit .NET assembly be able to call an
unmanaged 64-bit DLL?

3) On the AMD64, thats supports the running of bot 32-bit and 64-bit code,
would we be able to call unmanaged 32-bit DLLs from a 64-bit .NET assembly?
(Sometimes its not practical/possible to recompile/port the 32-bit DLL).

Please let me know if there is a better forum for these questions...

Thanks.

-d

--
 
Dennis Landi said:
Hello,

I have three questions:

1) I have been perusing the MSDN VC++ pages. Everything seems to be geared
towards .NET integration. Will MS continue support natively compiled code
or will they be pushing developers to do everything as "managed" C++?
Click to expand...
No, we fully supprt compiling native code.

2) Also, on 32-bit platforms we can call 32-bit unmanaged DLLS from managed
assemblies. On Win64 will a 64-bit .NET assembly be able to call an
unmanaged 64-bit DLL?
Click to expand...
Yes, it will.

3) On the AMD64, thats supports the running of bot 32-bit and 64-bit code,
would we be able to call unmanaged 32-bit DLLs from a 64-bit .NET assembly?
(Sometimes its not practical/possible to recompile/port the 32-bit DLL).
Click to expand...
No. You will have to use any of the supported IPC mechanisms like named
pipes, sockets, memory mapped files, COM. There is no type of thunk on
64-bit version of Windows that will allow 64-bit user mode code to call
32-bit user mode code in the same process.
Please let me know if there is a better forum for these questions...
Click to expand...

Ronald Laeremans
Visual C++ team
 
Ronald Laeremans said:
No. You will have to use any of the supported IPC mechanisms like named
pipes, sockets, memory mapped files, COM. There is no type of thunk on
64-bit version of Windows that will allow 64-bit user mode code to call
32-bit user mode code in the same process.
Click to expand...

Ronald, thanks for the response.

You mention COM as one way for 64-bit .NET assembly to communicate with a
32-bit DLL. So a 64-bit assembly could invoke a 32-bit out-of-process COM
object just like we would do it now on a 32-bit O.S.?
 
Ronald Laeremans said:
No. You will have to use any of the supported IPC mechanisms like named
pipes, sockets, memory mapped files, COM. There is no type of thunk on
64-bit version of Windows that will allow 64-bit user mode code to call
32-bit user mode code in the same process.
Click to expand...

Ronald, thanks for the response.

You mention COM as one way for 64-bit .NET assembly to communicate with a
32-bit DLL. So a 64-bit assembly could invoke a 32-bit out-of-process COM
object just like we would do it now on a 32-bit O.S.?
 
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