Convert or cast LPWST to BSTR

Question

How to convert LPWSTR to BSTR? LPWSTR is WCHAR *, and BSTR is OLECHAR *, OLECHAR is again of the WCHAR type, just gaining a listing? or do we need to make some extra effort? It shows the wrong error / warning error.

Answer 1

You do it like this:

BSTR pBstr = SysAllocString(szWCharString); // do something with the BSTR here ... SysFreeString(pBstr); 

You must remember to free up the space used for the conversion by calling SysFreeString afterwards.

Answer 2

BSTR consists of OLECHAR [] and the length information preceding the line. BSTR is a pointer to a part of OLECHAR []. But BSTR functions require length information (capacity and length).

You need the SysAllocString function to highlight the entire structure.