QString convert to LPCWSTR ?

[opengpu2]

how QString convert to LPCWSTR ?

[Chris Kawa]

QString foo("Hello world");
auto bar = std::make_unique<wchar_t[]>(foo.length() + 1);
foo.toWCharArray(bar.get()); //toWCharArray does not append null terminator
bar[foo.length()] = 0; //so add it manually

MessageBox(NULL, bar.get(), L"Some caption", MB_OK);

or shorter:

QString foo("Hello world");
MessageBox(NULL, foo.toStdWString().c_str(), L"Some caption", MB_OK);

but be aware that the pointer returned in the second example is temporary, so the above is ok, but this is wrong:

QString foo("Hello world");
LPCWSTR bar = foo.toStdWString().c_str();
MessageBox(NULL, bar, L"Some caption", MB_OK); //bar is invalid at this point

[opengpu2]

can i use:
reinterpret_cast<LPCWSTR>(qstring.utf16()) ?

[Chris Kawa]

I personally cringe whenever I see reinterpret_cast but yes, it would work too.