Please help me fix this conversion problem

[Mike Pliam]

I have some 'legacy' code (viz., someone else's code that I really don't understand very well) that requires the following conversion:

      unsigned short *ucPtr;           // Temporary name holder
      ucPtr = L"quit";				   // error C2440: '=' : cannot convert from 'wchar_t [5]' to 'unsigned short *'

The code was probably written for an earlier compiler, say VC6.0. It gives the above noted error using VC7.0.

What's the problem here ?

Thanks.

Mike

[JVene]

try TCHAR * instead of unsigned short *

try T("") instead of L""

[John E]

Well you're right - it does compile in VC++ 6. I assume that "quit" is intended to be a simple (2 byte) Unicode string (hence the name 'ucPtr') ??

ucPtr will point to the first letter of the string literal "quit". Therefore ++ucPtr would point to 'u' (expressed as 2 bytes). A further ++ucPtr would point to 'i' expressed as 2 bytes, etc.

[Mike Pliam]

TCHAR works - in that it will compile in VC 7.0. But that's only part of the problem. The ucPtr is subsequently given as a parameter to a COLEVARIANT method and the uPtr compiled as TCHAR is rejected by the method as the usual .. cannot convert .

Any other ideas ?

Mike

[Arjay]

TCHAR works - in that it will compile in VC 7.0. But that's only part of the problem. The ucPtr is subsequently given as a parameter to a COLEVARIANT method and the uPtr compiled as TCHAR is rejected by the method as the usual .. cannot convert .

Any other ideas ?

Mike

Use the CComVariant or _variant_t classes. They both have constructors that take a TCHAR.

[UnderDog]

Try this - Delete the /Zc:wchar_t compiler option in your project settings. Then see if it compiles with original unsigned short* and if your other problems go away. Please let us know what you find out.

[Mike Pliam]

Thanks UnderDog -

That completely solves the problem.

Mike