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gcnew keyEventHandler编译问题(vc++)

visual-c++ managed-c++ event-handling

1

gingerbreadboy · 技术社区 · 16 年前

我的托管C++代码无法用错误消息编译

.\Window.cpp(11) : error C2440: 'initializing' : cannot convert from 'System::Windows::Forms::Form ^' to 'Enviroment::Window ^'
        No user-defined-conversion operator available, or
        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
.\Window.cpp(11) : error C3754: delegate constructor: member function 'Enviroment::Window::_keydown' cannot be called on an instance of type 'System::Windows::Forms::Form ^'

Error   1   error C2440: 'initializing' : cannot convert from 'System::Windows::Forms::Form ^' to 'Enviroment::Window ^'    c:\Users\Thomas\Documents\Visual Studio 2008\Projects\Project_X\Project_X\Window.cpp    11
Error   2   error C3754: delegate constructor: member function 'Enviroment::Window::_keydown' cannot be called on an instance of type 'System::Windows::Forms::Form ^'  c:\Users\Thomas\Documents\Visual Studio 2008\Projects\Project_X\Project_X\Window.cpp    11

在窗口h

ref class Window
    {
    public:
        Window();
        void _keydown(System::Object^ sender, System::Windows::Forms::KeyEventArgs^ e);
    }

在窗口中

Window::Window()
    {
        Form^ form = gcnew Form();
        form->KeyDown+= gcnew KeyEventHandler(form, &Window::_keydown);
}

后来呢

void Window::_keydown(System::Object^ sender, System::Windows::Forms::KeyEventArgs^ e)
    {
        //stuff
    }

救命!

1 回复 | 直到 16 年前

1

2

Blindy 16 年前

我想你的意思是说:

form->KeyDown+= gcnew KeyEventHandler(this, &Window::_keydown);

在C++中,一个类函数指针由2个东西组成,即实际指针(这一部分是正确的)和一个指向“函数”的指针,这个函数是保持函数的类的类型。这是你的 Window ,不是微软的 Form .