hello *h=new hello; h->show();
时间: 2024-03-17 21:41:10 浏览: 15
这是一个C++的动态内存分配和对象调用的语句。首先,使用new运算符在堆内存中分配了一个hello对象的空间,并返回该对象的指针。然后,使用箭头运算符 -> 调用指针所指向对象的show()方法。这段代码等价于以下的语句:
```
hello *h = new hello;
h->show();
```
其中,hello是一个类名,show()是该类的一个公有成员函数。这段代码的作用是创建一个hello对象,并调用该对象的show()方法。
相关问题
如何将以下代码转成pyside6的 #include <QtGui> class GripLabel: public QLabel { Q_OBJECT public: GripLabel(QString const& title, QWidget* parent = 0) : QLabel(title, parent), resizing(false), gripSize(10, 10) { // Prevent the widget from disappearing altogether // Bare minimum would be gripSize setMinimumSize(100, 30); } QSize sizeHint() const { return minimumSize(); } protected: bool mouseInGrip(QPoint mousePos) { // "handle" is in the lower right hand corner return ((mousePos.x() > (width() - gripSize.width())) && (mousePos.y() > (height() - gripSize.height()))); } void mousePressEvent(QMouseEvent *e) { // Check if we hit the grip handle if (mouseInGrip(e->pos())) { oldPos = e->pos(); resizing = true; } else { resizing = false; } } void mouseMoveEvent(QMouseEvent *e) { if (resizing) { // adapt the widget size based on mouse movement QPoint delta = e->pos() - oldPos; oldPos = e->pos(); setMinimumSize(width()+delta.x(), height()+delta.y()); updateGeometry(); } } void paintEvent(QPaintEvent *e) { QLabel::paintEvent(e); QPainter p(this); p.setPen(Qt::red); p.drawRect(width()-gripSize.width(), height()-gripSize.height(), gripSize.width(), gripSize.height()); } private: bool resizing; QSize gripSize; QPoint oldPos; }; sample 主要: #include "griplabel.h" int main(int argc, char **argv) { QApplication app(argc, argv); QWidget *w = new QWidget; QPushButton *b = new QPushButton("button"); GripLabel *l = new GripLabel("Hello"); QHBoxLayout *y = new QHBoxLayout; y->addWidget(b); y->addWidget(l); y->setSizeConstraint(QLayout::SetFixedSize); w->setLayout(y); w->show(); return app.exec(); }
以下是将C++代码转换为使用Pyside6的Python代码:
```python
from PySide6.QtCore import QPoint, QSize
from PySide6.QtGui import QPainter
from PySide6.QtWidgets import QApplication, QWidget, QPushButton, QHBoxLayout, QLabel
class GripLabel(QLabel):
def __init__(self, title: str, parent=None):
super().__init__(title, parent)
self.resizing = False
self.gripSize = QSize(10, 10)
self.setMinimumSize(QSize(100, 30))
def sizeHint(self):
return self.minimumSize()
def mouseInGrip(self, mousePos: QPoint):
return mousePos.x() > (self.width() - self.gripSize.width()) and mousePos.y() > (self.height() - self.gripSize.height())
def mousePressEvent(self, e):
if self.mouseInGrip(e.pos()):
self.oldPos = e.pos()
self.resizing = True
else:
self.resizing = False
def mouseMoveEvent(self, e):
if self.resizing:
delta = e.pos() - self.oldPos
self.oldPos = e.pos()
self.setMinimumSize(self.width() + delta.x(), self.height() + delta.y())
self.updateGeometry()
def paintEvent(self, e):
super().paintEvent(e)
p = QPainter(self)
p.setPen(Qt.red)
p.drawRect(self.width() - self.gripSize.width(), self.height() - self.gripSize.height(), self.gripSize.width(), self.gripSize.height())
if __name__ == '__main__':
app = QApplication([])
w = QWidget()
b = QPushButton("button")
l = GripLabel("Hello")
y = QHBoxLayout()
y.addWidget(b)
y.addWidget(l)
y.setSizeConstraint(QLayout.SetFixedSize)
w.setLayout(y)
w.show()
app.exec()
```
需要注意的是,由于Pyside6和PyQt5在某些方面具有不同的语法和实现,因此在转换代码时可能需要进行一些调整。在本例中,我对`QLayout`类的引用进行了一些调整,并将`QPoint`和`QSize`类的头文件引用替换为`PySide6.QtCore`中的模块。
<el-form class="login_form" :model="loginForm" :rules="rules" ref="loginForms"> <h1>Hello</h1> <h2>欢迎来到硅谷甄选</h2> <el-form-item prop="username"> <el-input :prefix-icon="User" v-model="loginForm.username"></el-input> </el-form-item> <el-form-item prop="password"> <el-input type="password" :prefix-icon="Lock" v-model="loginForm.password" show-password></el-input>改写为实注册功能
好的,请看以下代码,这是一个简单的注册表单实现:
```
<el-form class="register_form" :model="registerForm" :rules="rules" ref="registerForms">
<h1>欢迎注册</h1>
<el-form-item prop="username">
<el-input :prefix-icon="User" v-model="registerForm.username"></el-input>
</el-form-item>
<el-form-item prop="email">
<el-input :prefix-icon="Email" v-model="registerForm.email"></el-input>
</el-form-item>
<el-form-item prop="password">
<el-input type="password" :prefix-icon="Lock" v-model="registerForm.password" show-password></el-input>
</el-form-item>
<el-form-item prop="confirmPassword">
<el-input type="password" :prefix-icon="Lock" v-model="registerForm.confirmPassword" show-password></el-input>
</el-form-item>
<el-button type="primary" @click="register">注册</el-button>
</el-form>
```
需要注意的是,这个模板中的表单项和验证规则都需要与 `registerForm` 和 `rules` 对象相对应。同时,需要在 `data` 选项中定义这两个对象:
```
data() {
return {
registerForm: {
username: '',
email: '',
password: '',
confirmPassword: ''
},
rules: {
username: [
{ required: true, message: '请输入用户名', trigger: 'blur' }
],
email: [
{ required: true, message: '请输入邮箱', trigger: 'blur' },
{ type: 'email', message: '请输入正确的邮箱地址', trigger: ['blur', 'change'] }
],
password: [
{ required: true, message: '请输入密码', trigger: 'blur' },
{ min: 6, message: '密码长度不能少于 6 位', trigger: 'blur' }
],
confirmPassword: [
{ required: true, message: '请再次输入密码', trigger: 'blur' },
{ validator: this.checkConfirmPassword, trigger: 'blur' }
]
}
}
},
```
最后,需要在 `methods` 选项中定义 `register` 函数,实现注册逻辑:
```
methods: {
async register() {
await this.$refs.registerForms.validate();
try {
// 调用 API 请求进行注册,并处理返回结果
const res = await api.register(this.registerForm);
if (res.status === 200) {
ElNotification({ type: 'success', message: res.data.message });
this.$router.push('/login');
} else {
ElNotification({ type: 'error', message: res.data.message });
}
} catch (error) {
ElNotification({ type: 'error', message: error.message });
}
},
checkConfirmPassword(rule, value, callback) {
if (value !== this.registerForm.password) {
callback(new Error('两次输入的密码不一致'));
} else {
callback();
}
}
}
```
这里的 `api` 对象是一个封装了注册接口的 API 请求对象,具体实现方式可能因技术栈不同而有所差异。另外,为了保证数据安全,建议在实际开发过程中采用后端验证的方式,而不是仅依赖前端表单验证。
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