QT4 各数据类型间的转换

QT4 各数据类型间的转换

<1> char * 与 const char *的转换

char *ch1 = "ABCD";

const char *ch2;

ch1 = (char *)ch2;

<2>char 转换为 QString

char ch = 'A';

QString str;

str = QString(ch);

<3> QString 转换为 char *

QString str="ABC";

char *ch;

ch = str.toLatin1.data();

<4> QByteArray 转换为 char *

char *ch;

QByteArray byte;

ch = byte.data();

<5> char *转换为 QByteArray

char *ch;

QByteArray byte;

byte = QByteArray(ch);

<6> QString 转换为 QByteArray

QByteArray byte;

QString str;

byte = str.toAscii();

<7> QByteArray 转换为 QString

QByteArray byte;

QString string;

string = QString(byte)

<8>  int 转 QString

int a = 10;

QString str;

str = QString::number(a);

<9> QString 转 int

QString str="100";

int b;

b = str.toInt();