在同一 Name.h 文件中使用 Name::Class2 中的 Name::Class1 失败

发布于 2024-10-19 08:24:50 字数 1003 浏览 2 评论 0原文

我有一个头文件“Custom.h”，其中包含两个类：ResizeLabel 和 ResizePanel，用于构建包含自定义控件的 dll。如果我在 ResizeLabel 中使用 Custom::ResizePanel 它会失败：

error C2039: 'ResizePanel' : is not a member of 'Custom'

错误列表中还有一个警告：

Exception of type 'System.Exception' was thrown

我想该警告是相关的。是否是因为 Visual Studio 正在尝试从它正在编译的包含 Custom::ResizePanel 的代码中加载包含它的 dll？

代码如下：

namespace Custom {

public ref class ResizeLabel : public System::Windows::Forms::Label
{
protected: virtual void OnTextChanged(System::EventArgs^  e) override {
            __super::OnTextChanged(e);
            // Not elegant I know, 
            // but this is just to force the panel to process the size change
            dynamic_cast<Custom::ResizePanel^>(this->Parent)->CurrentWidth = 0;
        }
    ...
    };
public ref class ResizePanel : public System::Windows::Forms::Panel
{ ... };
}

我将其设为dynamic_cast只是为了减少报告的错误数量。

我怎样才能最好地避免这个问题？

原文

I've a header file 'Custom.h' with two classes, ResizeLabel and ResizePanel, used to build a dll containing Custom Controls. If I use Custom::ResizePanel within ResizeLabel it is failing:

error C2039: 'ResizePanel' : is not a member of 'Custom'

There is also a warning in the Errorlist:

Exception of type 'System.Exception' was thrown

I imagine that the warning is relevant. Could it be because Visual Studio is trying to load the dll which contains Custom::ResizePanel from the code it is compiling which contains it?

The code is as follows:

namespace Custom {

public ref class ResizeLabel : public System::Windows::Forms::Label
{
protected: virtual void OnTextChanged(System::EventArgs^  e) override {
            __super::OnTextChanged(e);
            // Not elegant I know, 
            // but this is just to force the panel to process the size change
            dynamic_cast<Custom::ResizePanel^>(this->Parent)->CurrentWidth = 0;
        }
    ...
    };
public ref class ResizePanel : public System::Windows::Forms::Panel
{ ... };
}

I made it a dynamic_cast just to reduce the number of errors reported.

How do I best avoid this problem?

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囍孤女 2024-10-26 08:24:50

这是经典的 C++ 行为。在不首先学习标准 C++ 基础知识的情况下尝试学习 C++/CLI 将非常困难。

完成这项工作的一般模式是：

转发声明类型
定义类型
定义类型成员函数

按该顺序

。例如：

ref class ResizeLabel;
ref class ResizePanel;

public ref class ResizeLabel : public System::Windows::Forms::Label
{
protected:
    virtual void OnTextChanged(System::EventArgs^  e) override;
    ...
};

public ref class ResizePanel : public System::Windows::Forms::Panel
{
    ...
};

void ResizeLabel::OnTextChanged(System::EventArgs^  e)
{
    __super::OnTextChanged(e);
    // Not elegant I know, 
    // but this is just to force the panel to process the size change
    dynamic_cast<Custom::ResizePanel^>(this->Parent)->CurrentWidth = 0;
}

This is classic C++ behavior. Trying to learn C++/CLI without first learning basics of standard C++ is going to be very difficult.

The general pattern to make this work is:

Forward declare types
Define types
Define type member functions

in that order.

For example:

ref class ResizeLabel;
ref class ResizePanel;

public ref class ResizeLabel : public System::Windows::Forms::Label
{
protected:
    virtual void OnTextChanged(System::EventArgs^  e) override;
    ...
};

public ref class ResizePanel : public System::Windows::Forms::Panel
{
    ...
};

void ResizeLabel::OnTextChanged(System::EventArgs^  e)
{
    __super::OnTextChanged(e);
    // Not elegant I know, 
    // but this is just to force the panel to process the size change
    dynamic_cast<Custom::ResizePanel^>(this->Parent)->CurrentWidth = 0;
}

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