sketch for http://company.yandex.ru/job/vacancies/yadisk_wind.xml

win_text.hpp

#include <string>
#include <vector>

// 1. std::basic_string have continuos storage
std::wstring GetWindowTextW(HWND hWnd)
{
  std::wstring text(::GetWindowTextLengthW(hWnd), L'\0');
	size_t len = ::GetWindowTextW(hWnd, &text[0], text.size());
	text.resize(len);
	return std::move(text);
}

// 2. std::basic_string doesn't have continuos storage
std::wstring GetWindowTextW(HWND hWnd)
{
	std::vector<wchar_t> text(::GetWindowTextLengthW(hWnd));
	size_t len = ::GetWindowTextW(hWnd, &text[0], text.size());
	text.resize(len);
	return std::wstring(&text[0], text.size());
}