qt按照不同编码格式读取文字(UTF-16LE,UTF-8,UTF-8BOM,UTF-16BE)

enum class EncodingFormat : int
{ANSI = 0,//GBKUTF16LE,UTF16BE,UTF8,UTF8BOM,
};
EncodingFormat VideoPlayer::FileCharacterEncoding(const QString &fileName)
{//假定默认编码utf8EncodingFormat code = EncodingFormat::UTF8;QFile file(fileName);if (file.open(QIODevice::ReadOnly)){//读取3字节用于判断QByteArray buffer = file.read(3);quint8 sz1st = buffer.at(0);quint8 sz2nd = buffer.at(1);quint8 sz3rd = buffer.at(2);if (sz1st == 0xFF && sz2nd == 0xFE){code = EncodingFormat::UTF16LE;}else if (sz1st == 0xFE && sz2nd == 0xFF){code = EncodingFormat::UTF16BE;}else if (sz1st == 0xEF && sz2nd == 0xBB && sz3rd == 0xBF){code = EncodingFormat::UTF8BOM;}else{//尝试用utf8转换,如果无效字符数大于0,则表示是ansi编码QTextCodec::ConverterState cs;QTextCodec* tc = QTextCodec::codecForName("utf-8");tc->toUnicode(buffer.constData(), buffer.size(), &cs);code = (cs.invalidChars > 0) ? EncodingFormat::ANSI : EncodingFormat::UTF8;}file.close();}return code;
}

上面是解析文件格式，下面是按照格式读取内容

QString srtfile = "D://test.srt";
EncodingFormat code = FileCharacterEncoding(srtfile);QFile file(srtfile);if(!file.open(QIODevice::ReadOnly)) {qDebug()<<"未找到外挂字幕文件："<<srtfile<<endl;}m_SrtInfoLst.clear();QTextCodec::ConverterState state;QTextCodec *codec = QTextCodec::codecForName("UTF-8");if(code==EncodingFormat::UTF16LE){codec = QTextCodec::codecForName("UTF-16LE");}else if(code==EncodingFormat::UTF8){codec = QTextCodec::codecForName("UTF-8");}else if(code==EncodingFormat::UTF8BOM){codec = QTextCodec::codecForName("UTF-8");}else if(code==EncodingFormat::UTF16BE){codec = QTextCodec::codecForName("UTF-16BE");}QTextStream stream_src(&file);stream_src.setCodec(codec);//这里就是按照对应格式解析出来了while(!stream_src.atEnd()) {QString str = stream_src.readLine();//一行一行获取内容//TODO:......}file.close();