1、字符串转ASCII码
1 1 QString str = "abc123"; 2 2 QByteArry data = str.toUtf8(); //输出data：61 62 63 31 32 3
2、ASCII码转字符串
1 QByteArray data = {61, 62, 63, 31, 32, 33}; 2 QString str; 3 for(int i = 0; i < data .count(); ++i) 4 { 5 str.append(QChar(data .at(i))); 6 } 7 //输出str:abc123
3、16进制以字符串输出
1 QByteArray data= {0x45, 0x65, 0x75}; 2 QString str = QString("%1").arg(data.toHex(":")); //输出45:65:75
4、QString转为LPSTR，LPTSTR
（1）作为函数形参
1 QString str = tr("hello"); 2 (LPSTR)str.toLocal8Bit().data()； 3 (LPTSTR)str.utf16();
（2）直接赋值
1 LPSTR data = (LPSTR)"hello"； 2 LPTSTR info = (LPTSTR)"hello";