Qt的資料型別與標準c++是不一樣的，在開發的時候，必然會涉及到很多資料型別的轉換。早已厭倦了百度QString轉QByteArray，QByteArray轉char*，QString轉string…。Qt的第一篇文章，就先來總結一下我用過的資料之間的轉換。

1、QString轉QByteArray

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

2、QByteArray轉QString

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

3、QString轉String

QString string;

std::string str;

str = string.toStdString();

4、String轉QString

QString string;

std::string str;

string = QString::fromStdString(str);

5、QByteArray轉char *

char *ch; //不能定義成ch[n]，陣列和指標不一樣;
QByteArray byte;
ch = byte.data();

6、char *轉QByteArray

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

7、QString轉char *

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

8、char *轉QString

char *ch;

QString string= QString(QLatin1String(ch));

9、QHostAddress轉QString

QHostAddress address;

QString string = address.toString();

10、QString轉QHostAddress

QString string;

QHostAddress address(string);

11、QString轉unsigned char

QString string;

bool ok;

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

12、unsigned char轉QString

unsigned char uch;

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

13、int轉QString

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

14、QString轉int

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