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  • QT 关联QComboBox的currentIndexChanged时遇到 成员指针指向重载指针函数问题

    在项目中动态添加了一个QComboBox,在当准备关联currentIndexChanged信号到某个成员函数中时,发现currentIndexChanged有两个重载:
        void currentIndexChanged(int index);
        void currentIndexChanged(const QString &);

    如果直接关联,例:

    connect(comboBox, &QComboBox::currentIndexChanged,this,  &Dialog::comBoxChangeIndex);

     会报:

    error: no matching member function for call to 'connect'
    需要把对应的函数强转一下,指定使用currentIndexChanged函数的那个重载:
    connect(comboBox, (void (QComboBox::*)(int))&QComboBox::currentIndexChanged, this, (void (Dialog::*)(int))&Dialog::comBoxChangeIndex);
    connect(comboBox, (void (QComboBox::*)(int))&QComboBox::currentIndexChanged, this, (void (Dialog::*)(int))&Dialog::comBoxChangeIndex);
    这样,就指定了要用QComboBox的currentIndexChanged(int)重载,如果想使用currentIndexChanged(const QString &)重载,把(void (QComboBox::*)(int))改成(void (QComboBox::*)(const QString &))


    例:
      connect(combobox, (void (QComboBox::*)(int))&QComboBox::currentIndexChanged, this, (void (Setting::*)(int))&Setting::typeComBoxCurrentIndexChanged);
      connect(combobox, (void (QComboBox::*)(const QString &))&QComboBox::currentIndexChanged, this, (void (Setting::*)(QString))&Setting::typeComBoxCurrentIndexChanged);

    这里Setting类的typeComBoxCurrentIndexChanged函数也有两个重载,对应QComboBox的currentIndexChanged函数两个重载。

    void typeComBoxCurrentIndexChanged(int)
    void typeComBoxCurrentIndexChanged(QString)
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  • 原文地址:https://www.cnblogs.com/GengMingYan/p/15420626.html
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