qt 转码

QTextCodec::ConverterState state;

QTextCodec *codec = QTextCodec::codecForName("UTF-8");

QString msg = codec->toUnicode(readContent, readContent.size(), &state);

if (state.invalidChars > 0)

{

msg = QTextCodec::codecForName("GBK")->toUnicode(readContent);

}