[omniORB] cannot convert from 'list_var *__w64 ' to 'list *

[Dalecki, Janusz]

Hi,
I am using omniORB 4.1.2 in C++ code that I develop using Visual Studio 2005. I am developing a C++ service with CORBA interface on 64 bit Windows 7 version. I would like the app to be 32 bit version though. My pre-processor variables are:
WIN32
_DEBUG
__NT__
__WIN32__
__x86__
_WIN32_WINNT=0x0400
__OSVERSION__=4

I have right now very simple idl (attached).
When I wrote my first method to return the list of string:
lcc::ProtocolDataList* TugunSituationListener::getSupportedProtocols()
{

lcc::ProtocolDataList_var list = new lcc::ProtocolDataList();
list->length(1);
list[0].eventType = lcc::ProtocolTypeEnum::RS232C;
list[0].displayname = "RS232C";
return &list;
}
I am getting this error:
Error 2 error C2440: 'return' : cannot convert from 'lcc::ProtocolDataList_var *__w64 ' to 'lcc::ProtocolDataList *'
I don't understand this, why omniORB is trying to use 64 bit version for pointer?
Any help appreciated.
Regards,
Janusz


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[Luke Deller]

Hi Janusz,

Post by Dalecki, Janusz
lcc::ProtocolDataList* TugunSituationListener::getSupportedProtocols()
{
lcc::ProtocolDataList_var list = new lcc::ProtocolDataList();

...

Post by Dalecki, Janusz
return &list;

The return type of this function should be lcc::ProtocolDataList_ptr rather than lcc::ProtocolDataList*
Also the return statement should be:
return list._retn();

For documentation about how to do this right, see the C++ language mapping for CORBA IDL. The language mappings are available here:
http://www.omg.org/technology/documents/idl2x_spec_catalog.htm

Post by Dalecki, Janusz
Error 2 error C2440: 'return' : cannot convert from 'lcc::ProtocolDataList_var *__w64 ' to 'lcc::ProtocolDataList *'
I don't understand this, why omniORB is trying to use 64 bit version for pointer?

This "__w64" modifier is not saying what you think - it merely indicates that the size of this ProtoclDataList_var type is 32-bits when compiled as 32-bit, and the size is 64-bits when compiled as 64-bit. This is used by the /Wp64 compiler option to help detect 64-bit portability issues.

http://msdn.microsoft.com/en-us/library/yt4xw8fh(v=vs.80).aspx

Regards,
Luke.
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