QByteArray类
2015-09-10 14:50
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Qt GUI API中使用Unicode类型的字符串类QString。使用Unicode的好处是可以支持更多的地区语言,ASCII是Uncode的子集。
QByteArray和QString的方法和属性相似,可以参考QString。另外有一些与QByteArray相关的非成员函数:
QByteArray与QString之间的转换:
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类同样不以'\0'为结尾:如
转载自:/article/1382224.html
QByteArray和QString的方法和属性相似,可以参考QString。另外有一些与QByteArray相关的非成员函数:
//Related Non-Members //计算CRC16校验和 quint16 qChecksum ( const char * data, uint len ) //压缩data,并返回新的值,参数compressionLevel的值是0~9 QByteArray qCompress ( const QByteArray & data, int compressionLevel = -1 ) QByteArray qCompress ( const uchar * data, int nbytes, int compressionLevel = -1 ) //解压缩 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 ) //比较字符串 int qstrcmp ( const char * str1, const char * str2 ) //复制字符串 char * qstrcpy ( char * dst, const char * src ) char * qstrncpy ( char * dst, const char * src, uint len ) //分配空间复制字符串返回 char * qstrdup ( const char * src ) //忽略大小写的字符串比较 int qstricmp ( const char * str1, const char * str2 ) int qstrnicmp ( const char * str1, const char * str2, uint len ) //返回字符串的长度 uint qstrlen ( const char * str ) uint qstrnlen ( const char * str, uint maxlen ) //固定长度内的字符串比较 int qstrncmp ( const char * str1, const char * str2, uint len ) //相关QByteArray和const char *的运算符 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与QString之间的转换:
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类同样不以'\0'为结尾: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”
转载自:/article/1382224.html
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