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    copied!<p>Here is an example which shows two methods, one based on the Qt library and one based on the ICU library. Both should be fairly platform-independent:</p> <pre><code>#include &lt;iostream&gt; #include &lt;sstream&gt; #include &lt;iomanip&gt; #include &lt;stdexcept&gt; #include &lt;boost/scoped_array.hpp&gt; #include &lt;QtCore/QString&gt; #include &lt;QtCore/QUrl&gt; #include &lt;QtCore/QVector&gt; #include &lt;unicode/utypes.h&gt; #include &lt;unicode/ustring.h&gt; #include &lt;unicode/unistr.h&gt; #include &lt;unicode/schriter.h&gt; void encodeQt() { const QString str = QString::fromWCharArray(L"ドイツ語で検索していてこちらのサイトにたどり着きました。"); const QUrl url = str; std::cout &lt;&lt; "URL encoded: " &lt;&lt; url.toEncoded().constData() &lt;&lt; std::endl; typedef QVector&lt;uint&gt; CodePointVector; const CodePointVector codePoints = str.toUcs4(); std::stringstream htmlEncoded; for (CodePointVector::const_iterator it = codePoints.constBegin(); it != codePoints.constEnd(); ++it) { htmlEncoded &lt;&lt; "&amp;#" &lt;&lt; *it &lt;&lt; ';'; } std::cout &lt;&lt; "HTML encoded: " &lt;&lt; htmlEncoded.str() &lt;&lt; std::endl; } void encodeICU() { const std::wstring cppString = L"ドイツ語で検索していてこちらのサイトにたどり着きました。"; int bufSize = cppString.length() * 2; boost::scoped_array&lt;UChar&gt; strBuffer(new UChar[bufSize]); int size = 0; UErrorCode error = U_ZERO_ERROR; u_strFromWCS(strBuffer.get(), bufSize, &amp;size, cppString.data(), cppString.length(), &amp;error); if (error) return; const UnicodeString str(strBuffer.get(), size); bufSize = str.length() * 4; boost::scoped_array&lt;char&gt; buffer(new char[bufSize]); u_strToUTF8(buffer.get(), bufSize, &amp;size, str.getBuffer(), str.length(), &amp;error); if (error) return; const std::string urlUtf8(buffer.get(), size); std::stringstream urlEncoded; urlEncoded &lt;&lt; std::hex &lt;&lt; std::setfill('0'); for (std::string::const_iterator it = urlUtf8.begin(); it != urlUtf8.end(); ++it) { urlEncoded &lt;&lt; '%' &lt;&lt; std::setw(2) &lt;&lt; static_cast&lt;unsigned int&gt;(static_cast&lt;unsigned char&gt;(*it)); } std::cout &lt;&lt; "URL encoded: " &lt;&lt; urlEncoded.str() &lt;&lt; std::endl; std::stringstream htmlEncoded; StringCharacterIterator it = str; while (it.hasNext()) { const UChar32 pt = it.next32PostInc(); htmlEncoded &lt;&lt; "&amp;#" &lt;&lt; pt &lt;&lt; ';'; } std::cout &lt;&lt; "HTML encoded: " &lt;&lt; htmlEncoded.str() &lt;&lt; std::endl; } int main() { encodeQt(); encodeICU(); } </code></pre>
 

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