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Qt（六）数值与字符串转换
2022-07-15 17:58:00 【51CTO】
文章目录
一、UI设计
新建项目，主要选项如下图：一个QWidget，带ui文件，并初步Ui设计
拖动组件：QLable,QPushButton,QlineEdit。
详情ui文件
<?xml
version="1.0" encoding="UTF-8"?>
<
ui
version=
"4.0"
>
<
class
>Widget
</
class
>
<
widget
class=
"QWidget"
name=
"Widget"
>
<
property
name=
"geometry"
>
<
rect
>
<
x
>0
</
x
>
<
y
>0
</
y
>
<
width
>511
</
width
>
<
height
>203
</
height
>
</
rect
>
</
property
>
<
property
name=
"windowTitle"
>
<
string
>Widget
</
string
>
</
property
>
<
layout
class=
"QGridLayout"
name=
"gridLayout_3"
>
<
item
row=
"0"
column=
"0"
>
<
layout
class=
"QGridLayout"
name=
"gridLayout"
>
<
item
row=
"0"
column=
"0"
>
<
widget
class=
"QLabel"
name=
"label"
>
<
property
name=
"text"
>
<
string
>数量：
</
string
>
</
property
>
</
widget
>
</
item
>
<
item
row=
"0"
column=
"1"
>
<
widget
class=
"QLineEdit"
name=
"lineEditNum"
>
<
property
name=
"text"
>
<
string
>12
</
string
>
</
property
>
</
widget
>
</
item
>
<
item
row=
"0"
column=
"2"
rowspan=
"2"
>
<
spacer
name=
"horizontalSpacer"
>
<
property
name=
"orientation"
>
<
enum
>Qt::Horizontal
</
enum
>
</
property
>
<
property
name=
"sizeHint"
stdset=
"0"
>
<
size
>
<
width
>17
</
width
>
<
height
>20
</
height
>
</
size
>
</
property
>
</
spacer
>
</
item
>
<
item
row=
"0"
column=
"3"
>
<
widget
class=
"QLabel"
name=
"label_2"
>
<
property
name=
"text"
>
<
string
>单价：
</
string
>
</
property
>
</
widget
>
</
item
>
<
item
row=
"0"
column=
"4"
>
<
widget
class=
"QLineEdit"
name=
"lineEditPrice"
>
<
property
name=
"text"
>
<
string
>5.0
</
string
>
</
property
>
</
widget
>
</
item
>
<
item
row=
"1"
column=
"1"
>
<
widget
class=
"QPushButton"
name=
"pushButton"
>
<
property
name=
"text"
>
<
string
>计算
</
string
>
</
property
>
</
widget
>
</
item
>
<
item
row=
"1"
column=
"3"
>
<
widget
class=
"QLabel"
name=
"label_3"
>
<
property
name=
"text"
>
<
string
>总价：
</
string
>
</
property
>
</
widget
>
</
item
>
<
item
row=
"1"
column=
"4"
>
<
widget
class=
"QLineEdit"
name=
"lineEditTotal"
/>
</
item
>
</
layout
>
</
item
>
<
item
row=
"1"
column=
"0"
>
<
spacer
name=
"verticalSpacer"
>
<
property
name=
"orientation"
>
<
enum
>Qt::Vertical
</
enum
>
</
property
>
<
property
name=
"sizeHint"
stdset=
"0"
>
<
size
>
<
width
>20
</
width
>
<
height
>9
</
height
>
</
size
>
</
property
>
</
spacer
>
</
item
>
<
item
row=
"2"
column=
"0"
>
<
layout
class=
"QGridLayout"
name=
"gridLayout_2"
>
<
item
row=
"0"
column=
"1"
>
<
widget
class=
"QLineEdit"
name=
"lineEditTen"
>
<
property
name=
"text"
>
<
string
>15
</
string
>
</
property
>
</
widget
>
</
item
>
<
item
row=
"2"
column=
"2"
>
<
widget
class=
"QPushButton"
name=
"pushButton_4"
>
<
property
name=
"text"
>
<
string
>转换成其他进制
</
string
>
</
property
>
</
widget
>
</
item
>
<
item
row=
"0"
column=
"2"
>
<
widget
class=
"QPushButton"
name=
"pushButton_2"
>
<
property
name=
"text"
>
<
string
>转换成其他进制
</
string
>
</
property
>
</
widget
>
</
item
>
<
item
row=
"1"
column=
"0"
>
<
widget
class=
"QLabel"
name=
"label_5"
>
<
property
name=
"text"
>
<
string
>二进制：
</
string
>
</
property
>
</
widget
>
</
item
>
<
item
row=
"2"
column=
"1"
>
<
widget
class=
"QLineEdit"
name=
"lineEditHex"
/>
</
item
>
<
item
row=
"2"
column=
"0"
>
<
widget
class=
"QLabel"
name=
"label_6"
>
<
property
name=
"text"
>
<
string
>十六进制：
</
string
>
</
property
>
</
widget
>
</
item
>
<
item
row=
"1"
column=
"2"
>
<
widget
class=
"QPushButton"
name=
"pushButton_3"
>
<
property
name=
"text"
>
<
string
>转换成其他进制
</
string
>
</
property
>
</
widget
>
</
item
>
<
item
row=
"1"
column=
"1"
>
<
widget
class=
"QLineEdit"
name=
"lineEditSec"
/>
</
item
>
<
item
row=
"0"
column=
"0"
>
<
widget
class=
"QLabel"
name=
"label_4"
>
<
property
name=
"text"
>
<
string
>十进制：
</
string
>
</
property
>
</
widget
>
</
item
>
</
layout
>
</
item
>
</
layout
>
</
widget
>
<
resources
/>
<
connections
/>
</
ui
>
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二、代码开发
代码使用“转到槽“生成代码
widget.h
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
QT_BEGIN_NAMESPACE
namespace
Ui {
class
Widget; }
QT_END_NAMESPACE
class
Widget :
public
QWidget
{
Q_OBJECT
public:
Widget(
QWidget
*
parent
=
nullptr);
~Widget();
private
slots:
void
on_pushButton_clicked();
void
on_pushButton_2_clicked();
void
on_pushButton_3_clicked();
private:
Ui::Widget
*
ui;
};
#endif
// WIDGET_H
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widget.cpp
#include "widget.h"
#include "ui_widget.h"
Widget::Widget(
QWidget
*
parent)
:
QWidget(
parent)
,
ui(
new
Ui::Widget)
{
ui
->
setupUi(
this);
}
Widget::~Widget()
{
delete
ui;
}
void
Widget::on_pushButton_clicked()
{
QString
str
=
ui
->
lineEditNum
->
text();
int
num
=
str.
toInt();
str
=
ui
->
lineEditPrice
->
text();
float
price
=
str.
toFloat();
float
total
=
num
*
price;
str
=
str.
setNum(
total,
'f',
2);
ui
->
lineEditTotal
->
setText(
str);
}
void
Widget::on_pushButton_2_clicked()
{
QString
str
=
ui
->
lineEditTen
->
text();
int
value
=
str.
toInt();
str
=
str.
setNum(
value,
2);
ui
->
lineEditSec
->
setText(
str);
str
=
str.
setNum(
value,
16);
ui
->
lineEditHex
->
setText(
str.
toUpper());
}
void
Widget::on_pushButton_3_clicked()
{
QString
str
=
ui
->
lineEditSec
->
text();
bool
ok;
int
value
=
str.
toInt(
&
ok,
2);
// 以二进制方式读入
ui
->
lineEditTen
->
setText(
QString::number(
value));
ui
->
lineEditHex
->
setText(
QString::number(
value,
16).
toUpper());
}
void
Widget::on_pushButton_4_clicked()
{
QString
str
=
ui
->
lineEditHex
->
text();
bool
ok;
int
value
=
str.
toInt(
&
ok,
16);
// 以十六进制方式读入
ui
->
lineEditTen
->
setText(
QString::number(
value));
ui
->
lineEditSec
->
setText(
QString::number(
value,
2));
}
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三、演示效果
这里没有做容错处理，在输入字符时特别是：二进制只能是：01，十六进制只能是：0-9A-F。
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