QObject 将 QSystemDeviceInfo::Profile 连接到 QVariant

发布于 2024-12-29 08:06:54 字数 1104 浏览 5 评论 0原文

我的应用程序中有一个 QML 部分需要知道我所处的状态。currentProfileChanged 函数有一个信号，为我提供一个我想要的 QSystemDeviceInfo::Profile转换为 QVaraint 以便 QML 可以将配置文件理解为 0 到 7 之间的数字，但是这个函数：

QObject::connect(deviceInfo, 
    SIGNAL(currentProfileChanged(QSystemDeviceInfo::Profile)),
    rootObject,
    SLOT(changePower(QVariant(QSystemDeviceInfo::Profile))));

给出了这个奇怪的错误：

[Qt Message] Object::connect: No such slot
     QDeclarativeItem_QML_3::changePower(QVariant(QSystemDeviceInfo::Profile))  
     in C:/Users/Gerhard/QTProjects/Raker/main.cpp:142

我在这里做错了什么？

如果我尝试这样做：

QObject::connect(deviceInfo, 
    SIGNAL(currentProfileChanged(QSystemDeviceInfo::Profile)),
    rootObject,
    SLOT(changePower(QVariant(QSystemDeviceInfo::Profile))));

它会这样说：

[Qt Message] Object::connect: No such slot
     QDeclarativeItem_QML_3::changePower(QSystemDeviceInfo::Profile)  
     in C:/Users/Gerhard/QTProjects/Raker/main.cpp:142

如果我将其中任何一个或两个更改为 QVariant，它也会抱怨不兼容的参数。

原文

I have a QML part of my application that needs to know what state I'm in. The currentProfileChanged function has a signal giving me a QSystemDeviceInfo::Profile that I want to convert to a QVaraint so that the QML can understand the profile as a number between 0 and 7, but this function:

QObject::connect(deviceInfo, 
    SIGNAL(currentProfileChanged(QSystemDeviceInfo::Profile)),
    rootObject,
    SLOT(changePower(QVariant(QSystemDeviceInfo::Profile))));

Gives this strange error:

[Qt Message] Object::connect: No such slot
     QDeclarativeItem_QML_3::changePower(QVariant(QSystemDeviceInfo::Profile))  
     in C:/Users/Gerhard/QTProjects/Raker/main.cpp:142

What I am doing wrong here?

If I try this:

QObject::connect(deviceInfo, 
    SIGNAL(currentProfileChanged(QSystemDeviceInfo::Profile)),
    rootObject,
    SLOT(changePower(QVariant(QSystemDeviceInfo::Profile))));

It says this:

[Qt Message] Object::connect: No such slot
     QDeclarativeItem_QML_3::changePower(QSystemDeviceInfo::Profile)  
     in C:/Users/Gerhard/QTProjects/Raker/main.cpp:142

If I change any or both to just QVariant it also complains about incompatible arguments.

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御守 2025-01-05 08:06:54

槽函数不能有与信号中的参数不匹配的参数。您的插槽应指定为 ..SLOT(changePower(QSystemDeviceInfo::Profile))..

回复收藏 0 原文

┼── 2025-01-05 08:06:54

由于似乎没有更简单的方法，我必须编写一个函数来转换类型并添加更多信号槽，但至少它现在可以工作，如果您需要的话，这是我的函数：

#include <QObject>
#include <QVariant>
#include <QSystemDeviceInfo>
#include <QDebug>

using namespace QtMobility;


class changeVAriant : public QObject
{
    Q_OBJECT

public slots:
    void toVariant(QSystemDeviceInfo::Profile prof)
    {
        emit newVariant(QVariant(prof));
    }
signals:
    void newVariant(QVariant);
};

As there appears to be no easier way I had to write a function to convert the types and add some more signal slots but at least it works now, here's my function if you want it:

#include <QObject>
#include <QVariant>
#include <QSystemDeviceInfo>
#include <QDebug>

using namespace QtMobility;


class changeVAriant : public QObject
{
    Q_OBJECT

public slots:
    void toVariant(QSystemDeviceInfo::Profile prof)
    {
        emit newVariant(QVariant(prof));
    }
signals:
    void newVariant(QVariant);
};

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