Function winapi::um::uxtheme::GetThemeFilename

pub unsafe extern "system" fn GetThemeFilename(
    hTheme: HTHEME, 
    iPartId: c_int, 
    iStateId: c_int, 
    iPropId: c_int, 
    pszThemeFileName: LPWSTR, 
    cchMaxBuffChars: c_int
) -> HRESULT