| Hi,
I have this piece of code which I am trying to compile in VS 2005. ///////////////////////////////////////////////////////// CComBSTR combstrEventGroup = bstrEventGroup; hResult = ::UuidFromString(combstrEventGroup, &uuidEventGroupNr ); ////////////////////////////////////////////////////////////// Error: error C2664: 'UuidFromStringW' : cannot convert parameter 1 from 'ATL::CComBSTR' to 'unsigned short *' This compiles OK in VS 6.00 but it gives an error in VS 2005 (The project setiings has _UNICODE & UNICODE defined). I am using VS2005 Version 8.0.50727.42.
|
Error while compiling C2664
Hot Topic
- Microsoft Visual C++ Runtime Library error question
- Is it possible to...
- debug output/cout output/ & debugging best pracatices?
- MFC: CArray::RelocateElements
- deallocating memory
- Can and how do I extend an array of objects during run time?
- How to read unicode character??
- Graphics* graph; doesn't work
- is old THISFILE DEBUG headers at top of CPP files still necessary under VS2005?
- OT: Comments on the article (WAS malloc or new!?)
Error while compiling C2664
.seb
There was a recent thread on this topic. There's a bug in the SDK headers where RPC_WSTR was defined as unsigned short* rather than wchar_t*.
CComBSTR has a conversion operator to wchar_t* which would have been implicitly used if RPC_WSTR were defined correctly. In my workaround, I manually invoke that conversion operator, and then do the cast to RPC_WSTR. This workaround assumes that _UNICODE is defined. If it isn't, or you want portability, you'll need to provide an alternative version that converts wchar_t* to char* using the W2A conversion macro.
::UuidFromString( (RPC_WSTR)(TCHAR*)combstrEventGroup, &uuidEventGroupNr );
The reason your code worked under VC6 was because wchar_t was typedefed to unsigned short. Under VC8, wchar_t is its own native type. (This behavior is controlled by the compliler flag /Zc:wchar_t).
Brian
zuchbinder
I filed a bug on this issue. It was reported to have been fixed post-Beta 2, but that's not the case.
jbrunken
i am sorry for wrong error description:
Error:
error C2664: 'UuidFromStringW' : cannot convert parameter 1 from 'ATL::CComBSTR' to 'RPC_WSTR'