Qt between Qstring,char,int,qbytearray to conversion

11, various data types of mutual conversion
Conversion of char * to const char *
Char *ch1= "hello11";
const char *ch2= "HELLO22";
CH2 = ch1;//No error, but warning
CH1 = (char *) CH2;

Convert Char to QString
In fact, there are a lot of methods, I use:
Char a= ' B ';
QString str;
Str=qstring (a);

QString conversion to Char
Methods are also used in many
QString str= "ABC";
Char *ch;
ch = str.toLatin1.data ();

Qbytearray conversion to char *
Char *ch;//not defined as ch[n];
Qbytearray byte;
ch = byte.data ();

char * converted to Qbytearray
Char *ch;
Qbytearray byte;
byte = Qbytearray (CH);

QString conversion to Qbytearray
Qbytearray byte;
QString string;
byte = String.toascii ();


Qbytearray conversion to QString
Qbytearray byte;
QString string;
string = QString (byte);
Here we summarize the output of the two types:
Qdebug () << "print";
Qdebug () <<tr ("print");
Qdebug () <<ch; (ch is char type)
Qdebug () <<tr (CH);
Qdebug () <<byteArray; (ByteArray is Qbytearray type)
Qdebug () <<tr (ByteArray);
Qdebug () <<str; (str to qstring type)
But Qdebug () <<tr (str), it is not possible to use the TR () function to output the characters of the qstring type as follows:
Qdebug () <<tr (str.tolatin1);

int turn QString
int a=10;
QString b;
B=qstring::number (a)

QString ext. int
QString a= "120"
int b;
B=a.toint ()