PWCHAR and BSTR conversion

See if this helps

http://www.codeguru.com/forum/archive/index.php/t-150671.html

- Kelvin

Use _bstr_t class. _bstr_t instance can be created from BSTR pointer, and casted to char* and wchar_t*.
--> char to bstr to char*
void Foo(BSTR bstr)
{
    _bstr_t b(bstr, false);

    const char* pChar = (const char*)b;
    const wchar_t* pWChar = (const wchar_t*)b;
}

you could use functions:

::SysAllocString()
::SysFreeString()

example:
inline void CStatBar::SetText(OLECHAR * sz)
{
   SysFreeString(m_bstrMsg);   // Free previous string, if any.
   m_bstrMsg = SysAllocString(sz);
   // Caller should check to see if m_bstrMsg is null after calling this method.
}

CStatBar::~CStatBar()
{
   SysFreeString(m_bstrMsg);
}


MultiByteToWideChar() --> char* to wchar / pwchar
example:
char Src[] = "Hello World";
wchar_t DestBuffer[500] = L"";
MultiByteToWideChar(CP_ACP,0,Src,strlen(Src),DestBuffer,sizeof(DestBuffer));