Qt GUI API中使用Unicode類型的字符串類QString。使用Unicode的好處是可以支持更多的地區(qū)語言，ASCII是Uncode的子集。
QByteArray和QString的方法和屬性相似，可以參考QString。另外有一些與QByteArray相關(guān)的非成員函數(shù)：
- //Related Non-Members
-
- //計(jì)算CRC16校驗(yàn)和
- quint16 qChecksum ( const char * data, uint len )
- //壓縮data，并返回新的值，參數(shù)compressionLevel的值是0~9
- QByteArray qCompress ( const QByteArray & data, int compressionLevel = -1 )
- QByteArray qCompress ( const uchar * data, int nbytes, int compressionLevel = -1 )
- //解壓縮
- QByteArray qUncompress ( const QByteArray & data )
- QByteArray qUncompress ( const uchar * data, int nbytes )
- //格式化字符串
- int qsnprintf ( char * str, size_t n, const char * fmt, ... )
- int qvsnprintf ( char * str, size_t n, const char * fmt, va_list ap )
- //比較字符串
- int qstrcmp ( const char * str1, const char * str2 )
- //復(fù)制字符串
- char * qstrcpy ( char * dst, const char * src )
- char * qstrncpy ( char * dst, const char * src, uint len )
- //分配空間復(fù)制字符串返回
- char * qstrdup ( const char * src )
- //忽略大小寫的字符串比較
- int qstricmp ( const char * str1, const char * str2 )
- int qstrnicmp ( const char * str1, const char * str2, uint len )
- //返回字符串的長度
- uint qstrlen ( const char * str )
- uint qstrnlen ( const char * str, uint maxlen )
- //固定長度內(nèi)的字符串比較
- int qstrncmp ( const char * str1, const char * str2, uint len )
- //相關(guān)QByteArray和const char *的運(yùn)算符
- bool operator!= ( const QByteArray & a1, const QByteArray & a2 )
- bool operator!= ( const QByteArray & a1, const char * a2 )
- bool operator!= ( const char * a1, const QByteArray & a2 )
- const QByteArray operator+ ( const QByteArray & a1, const QByteArray & a2 )
- const QByteArray operator+ ( const QByteArray & a1, const char * a2 )
- const QByteArray operator+ ( const QByteArray & a1, char a2 )
- const QByteArray operator+ ( const char * a1, const QByteArray & a2 )
- const QByteArray operator+ ( char a1, const QByteArray & a2 )
- bool operator< ( const QByteArray & a1, const QByteArray & a2 )
- bool operator< ( const QByteArray & a1, const char * a2 )
- bool operator< ( const char * a1, const QByteArray & a2 )
- QDataStream & operator<< ( QDataStream & out, const QByteArray & ba )
- bool operator<= ( const QByteArray & a1, const QByteArray & a2 )
- bool operator<= ( const QByteArray & a1, const char * a2 )
- bool operator<= ( const char * a1, const QByteArray & a2 )
- bool operator== ( const QByteArray & a1, const QByteArray & a2 )
- bool operator== ( const QByteArray & a1, const char * a2 )
- bool operator== ( const char * a1, const QByteArray & a2 )
- bool operator> ( const QByteArray & a1, const QByteArray & a2 )
- bool operator> ( const QByteArray & a1, const char * a2 )
- bool operator> ( const char * a1, const QByteArray & a2 )
- bool operator>= ( const QByteArray & a1, const QByteArray & a2 )
- bool operator>= ( const QByteArray & a1, const char * a2 )
- bool operator>= ( const char * a1, const QByteArray & a2 )
- QDataStream & operator>> ( QDataStream & in, QByteArray & ba )
QByteArray與QString之間的轉(zhuǎn)換：
示例：
QByteArray cstr("abcd");
QString s = cstr;
QByteArray cstr("abcd");
QString s;
s.prepend(cstr);
QString s("hello");
QByteArray cstr = s.toAscii();
QString s("hello");
QByteArray cstr = s.toLatin1();
QByteArray類同樣不以'\0'為結(jié)尾：如
- QByteArray s;
- s.resize(5);
- s[0] = '1';
- s[1] = '2';
- s[2] = '3';
- s[3] = '\0';
- s[4] = 'a';
-
- cout << s << endl;
屏幕打印的是：“123 a”