版权声明:本文为博主原创文章,转载请注明出处。 https://blog.csdn.net/zbw1185/article/details/82778595
文章目录
int与string之间的转换
Qt C++
int i;
QString str;
str = QString::number(i);
QString str;
int i;
i = str.toInt();
Qml
property string str: "5"
property int num: 0
num = parseInt(str)
property string str: " "
property int num: 235
str = num.toString()
QString 与 QByteArray之间 的转换
QString str;
QByteArray byte;
byte = str.toLatin1();
QByteArray byte;
QString str;
str = QString(byte);
QByteArray 与 char*之 间的转换
char *ch;
QByteArray byte;
ch = byte.data();
char *ch;
QByteArray byte;
byte = QByteArray(ch);
QString与char 之间的转换
QString str = "a";
char c;
QByteArray byte = str.toLatin1();
c = byte.operator [](0);
char c = 'a';
QString str;
str = QString(c);
QString 与char*之间的转换
QString str = "abc";
char *ch;
QByteArray byte = str.toLatin1();
ch = byte.data();
char *ch;
QString str;
str = QString::fromLatin1(ch);
doblue/float取小数点后n位
参数2表示取小数点后2位
double/float size = 2.3334524;
QString str = QString::number(size, 'f', 2);
进位取舍计算
Qt C++
#include <QtMath>
double a = 1.1314;
int b = qCeil(a); //b=2, qCeil()为向上取整,无论小数点后是几都进位
int c = qFloor(a); //b=1, qFloor()为向下取整,无论小数点后是几都舍掉
int d = qRound(a); //b=1, qRound()为四舍五入
Qml
var a = 1.1314
var b = Math.ceil(a)
var c = Math.floor(a)
var d = Math.round(a)