一、QByteArray和QString之间的转换

1. QByteArray转为QString

QByteArray byte;
QString string(byte);

2. QString转为QByteArray

QString str;
QByteArray byte = str.toAscii();
QByteArray byte2 = str.toLatin1();

二、char数组与QByteArray之间的转换

1. char数组转为QByteArray

char ch[]{'a','b','c'};
QByteArray byte(ch);

2. QByteArray转为char数组

QByteArray byte;
char* str = byte.data();

三、char数组和QString之间的转换

1. char数组转为QString

QString::fromLatin1()可以将char数组转为QString，不过需要注意的是char数组没有以'\0'结尾的时候需要传入char数组长度

char ch[]{'a', 'b','c'};
QString qstr = QString::fromLatin1(ch, 3));

char ch[]{'a', 'b','c','\0'};
QString qstr = QString::fromLatin1(ch));
QString qstr2(ch);

2. QString转为char

QString str = "abcd";
char *chr = str.toLatin1().data();
char *chr2 = qPrintable(str);

四、将unsigned char数组转为QString表示的16进制

1. unsigned char数组转为QString

unsigned char un_char[]{0xff, 0xee, 0xdd, 0xcc, 0xaa};
QString ucTos = QString(QByteArray((char*)un_char, 5).toHex());