How to convert std::string to LPCWSTR in C++ (Unicode)

Question

I'm looking for a method, or a code snippet for converting std::string to LPCWSTR

Answer 1

Thanks for the link to the MSDN article. This is exactly what I was looking for.

std::wstring s2ws(const std::string& s)
{
    int len;
    int slength = (int)s.length() + 1;
    len = MultiByteToWideChar(CP_ACP, 0, s.c_str(), slength, 0, 0); 
    wchar_t* buf = new wchar_t[len];
    MultiByteToWideChar(CP_ACP, 0, s.c_str(), slength, buf, len);
    std::wstring r(buf);
    delete[] buf;
    return r;
}

std::wstring stemp = s2ws(myString);
LPCWSTR result = stemp.c_str();

Answer 2

The solution is actually a lot easier than any of the other suggestions:

std::wstring stemp = std::wstring(s.begin(), s.end());
LPCWSTR sw = stemp.c_str();

Best of all, it's platform independent. h2h :)

Answer 3

If you are in an ATL/MFC environment, You can use the ATL conversion macro:

#include <atlbase.h>
#include <atlconv.h>

. . .

string myStr("My string");
CA2W unicodeStr(myStr);

You can then use unicodeStr as an LPCWSTR. The memory for the unicode string is created on the stack and released then the destructor for unicodeStr executes.

Answer 4

Instead of using a std::string, you could use a std::wstring.

EDIT: Sorry this is not more explanatory, but I have to run.

Use std::wstring::c_str()

Answer 5

LPCWSTR lpcwName=std::wstring(strname.begin(), strname.end()).c_str()

Answer 6

string  myMessage="helloworld";
int len;
int slength = (int)myMessage.length() + 1;
len = MultiByteToWideChar(CP_ACP, 0, myMessage.c_str(), slength, 0, 0); 
wchar_t* buf = new wchar_t[len];
MultiByteToWideChar(CP_ACP, 0, myMessage.c_str(), slength, buf, len);
std::wstring r(buf);
 std::wstring stemp = r.C_str();
LPCWSTR result = stemp.c_str();