QT 中的数据类型有很多的，在写代码的过程中难免会遇到 数据类型的转换。

1、QString转QByteArray

QByteArray byte;
QString string;
byte = string.toLatin1();

2、QByteArray转QString

QByteArray byte;
QString string;
string = QString(byte);

3、QString转String

QString string;

std::string str;

str = string.toStdString();

4、String转QString

QString string;

std::string str;

string = QString::fromStdString(str);

5、QByteArray转char *

char *ch;         //不能定义成ch[n]，数组和指针不一样;
QByteArray byte;
ch = byte.data();

6、char *转QByteArray

char *ch;
QByteArray byte;
byte = QByteArray(ch);

7、QString转char *

QString string;
char *ch;
ch = string.toLatin1.data();

8、char *转QString

char *ch;

QString string= QString(QLatin1String(ch));

9、QHostAddress转QString

QHostAddress address;

QString string = address.toString();

10、QString转QHostAddress

QString string;

QHostAddress address(string);

11、QString转unsigned char

QString string;

bool ok;

unsigned char uch = string.toInt(&ok, 16);

12、unsigned char转QString

unsigned char uch;

QString string = QString::number(uch,16);

13、int转QString

int m;
QString string;
string=QString::number(m);

14、QString转int

QString string;
int m;
m=string.toInt();