1、int 与QString 互转 int-->QString int tmp = 125; QString str_a = QString::number(tmp, 10); // str_a == "125" 十进制 QString str_b = QString::number(tmp, 16).toUpper(); // str_b == "7D" 十六进制 QString str_c = QString("%1").arg(tmp, 4, 16, QChar('0'));// str_a == "0125" 十进制 QString str_d = QString("%1").arg(tmp, 4, 16, QChar('0'));// str_b == "007D" 十六进制 QString-->int QString num = "100"; int int_a = num.toUInt(); //int_a = 100 十进制 int int_b = num.toUInt(16); //int_b = 64 十六进制 2、float 与QString 互转 float-->QString float tmpNum = 3.1415; QString str = QString("%1").arg(tmpNum); // str == "3.1415" QString-->float QString num = "3.1415" ; float float_a = num.toFloat(); //float_a = 3.1415 3、char*与QString 互转 QString-->char* QString qstr = "hello csk"; char * p = qstr.toLocal8Bit().data(); char *pp = qstr.toStdString().data(); string str = qstr.toStdString(); char* ppp = str.c_str(); char*->QString char* ch = "hello"; qstr = QString(QLatin1String(ch)); // qstr="hello" 4、QString 有string互转 QString-->string QString qstr = "hello csk"; string stdstr = qstr.toStdString(); //stdstr = "hello csk"; string-->QString string stdstr = "hello"; QString qstr = QString::fromStdString(str); //qstr = "hello" 5、QString 有QByteArray互转 QByteArray-->QString QByteArray cstr("abcd"); QString s = cstr; QByteArray cstr("abcd"); QString s; s.prepend(cstr); QString-->QByteArray QString s("hello"); QByteArray cstr = s.toAscii(); //cstr="hello" QByteArray cstr1 = s.toLatin1(); //cstr1="hello" 6、QString 转GBK QString str="你好"; QString::fromLocal8Bit(str.c_str()); QString::fromLocal8Bit("你好"); 7、QString 与 wchar_t*互转 QString-->wchar_t* wchar_t* wptr = L"test"; QString ret = QString::fromWCharArray(wptr); //ret= "test"; QString ret2 = QString((QChar*)wptr, wcslen(wptr)); //ret2= "test"; wchar_t*-->QString wchar_t szBuf[1024]; QString str = tr("hello"); wcscpy_s(reinterpret_cast<wchar_t*>(szBuf),sizeof(szBuf) / sizeof(wchar_t),reinterpret_cast<const wchar_t*>(str.utf16())); wchar_t * wptr = reinterpret_cast<const wchar_t *>(str.utf16());8、QString 与 QDateTime互转 QDateTime-->QString QString str; QDateTime time; time = QDateTime::currentDateTime(); str = time.toString("yyyy-MM-dd hh:mm:ss"); // str = 2018-05-23 17:35:00 QString-->QDateTime QString strBuffer; QDateTime time; strBuffer = "2018-05-23 17:35:00"; time = QDateTime::fromString(strBuffer, "yyyy-MM-dd hh:mm:ss"); 9、QString 字体颜色 QString value = "hello,I'm csk"; value = QString("<span style=' color:#ff0000;'>%1</span>").arg(value); //value 的值若显示界面则为红色 10、string 转 wstringwstring stringTOwstring(const string& s) { setlocale(LC_ALL, "chs"); const char* _Source = s.c_str(); size_t _Dsize = s.size() + 1; wchar_t *_Dest = new wchar_t[_Dsize]; wmemset(_Dest, 0, _Dsize); mbstowcs(_Dest,_Source,_Dsize); wstring result = _Dest; delete []_Dest; return result; }
转载于:https://www.cnblogs.com/chenshikun/p/9079102.html
