String between unmanaged and managed

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Hi,
Some were I found this function:

LPCWSTR LPCSTR_2_LPCWSTR(const char* inString)
{
int len = strlen(inString) + 1;
wchar_t *outString = new wchar_t[len];
mbstowcs(outString, inString, len);
return (LPCWSTR) outString;
}

Now I have to post a message containing text (as wParam) from an
unmanaged part to a managed one.
I do something like this:

#unmanaged1
PostMessage(destHwnd, myMsg, (WPARAM) LPCSTR_2_LPCWSTR("string"), 0);

#unmanaged2
....
LPSTR text = new char[256];
SendMessage(toolbarHwnd, TM_GETBUTTONTEXT, wID, text);
PostMessage(destHwnd, myMsg, (WPARAM) LPCSTR_2_LPCWSTR(text), 0);


#managed
....
string s = Marshal.PtrToStrUni(m.WParam);

In case unmanaged1 I always receive correct string, instead in case
unmanged2 never.

I'm becoming crazy!!!

Andrea

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