CODEWITHSUNDEEP
c++windowswchar
Anand
Anand

Reputation: 67

converting or casting LPWST into BSTR

How to convert LPWSTR into BSTR ? LPWSTR is WCHAR * and BSTR is OLECHAR *, OLECHAR is again of type WCHAR, simply type casting will work ? or we need to do some extra effort ? It is showing bad conversion error/warning.

Upvotes: 4

Views: 947

Answers (2)

harper
harper

Reputation: 13690

The BSTR consists of a OLECHAR[] and a length information prepended to the string. The BSTR is a pointer to the OLECHAR[] part. But the BSTR functions require the length information (capacity and curent length).

You need the SysAllocString function to allocate the whole structure.

Upvotes: 1

Roger Rowland
Roger Rowland

Reputation: 26279

You do it like this 

BSTR pBstr = SysAllocString(szWCharString);

// do something with the BSTR here ...

SysFreeString(pBstr);

You have to remember to deallocate the space used for the conversion by calling SysFreeString afterwards.

Upvotes: 3

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