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copied!<p>I use the following two routines when converting back and forth between wchar and char-based strings:</p> <pre><code>include <string> // std::string, std::wstring include <algorithm> // std::copy std::wstring StringToWString(const std::string& s) { std::wstring temp(s.length(),L' '); std::copy(s.begin(), s.end(), temp.begin()); return temp; } std::string WStringToString(const std::wstring& s) { std::string temp(s.length(), ' '); std::copy(s.begin(), s.end(), temp.begin()); return temp; } </code></pre> <p>You can now solve your problem by the following assuming 'existingstr' is a wide-char string:</p> <pre><code>std::string narrow_str(WStringToString(existingstr)); LPCSTR win_str = narrow_str.c_str(); </code></pre> <p>You can go the other way just as easily given some 'narrowstr':</p> <pre><code>std::wstring wide_str(StringToWString(narrowstr)); LPWCSTR win_wstr = wide_str.c_str(); </code></pre> <p>Clearly, this is not efficient as you are both allocating a local and then copying it back through the stack (I mitigate that a bit by using the constructor initialization instead of an assignment...some compilers optimize away the extra copy that way).</p> <p>If possible, it would be better to work with the appropriate version of the Windows API by using the UNICODE macro (see <a href="http://msdn.microsoft.com/en-us/library/ff381407%28v=vs.85%29.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/ff381407%28v=vs.85%29.aspx</a> - Working With Strings (Windows)).</p> <p>However, assuming that is not possible for compatibility reasons, it does give you some insight as to what needs to happen.</p>

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