如何在mfc中处理ccombobox [英] How to get handle of ccombobox in mfc

问题描述

我无法处理CComboBox。

Hi,

I am not able to get handle of CComboBox.

CComboBox *pComboBox = reinterpret_cast<ccombobox>(GetDlgItem(IDC_COMBO1));

我检查pComboBox的值为null 。



我很惊讶，同样的代码行在我的其他小应用程序中工作正常，但在这里它失败了。



请提供您的意见？我需要处理组合框并使用手柄。



问候，

欢乐



我尝试过：

I checked value of pComboBox is null.

I am surprised, The same line of code is working fine in my other small application but here it fails.

Please provide your input? I need to get handle to combo Box and use the handle.

Regards,
Joy

What I have tried:

CComboBox *pComboBox = reinterpret_cast<ccombobox>(GetDlgItem(IDC_COMBO1));

推荐答案

你提出的代码行没有得到任何东西的处理 - 显然试图恢复指向 CComboBox MFC包装器对象的指针，该对象是提供此指针代码的窗口的子窗口执行。



所以...



如果你真的想要一个指向MFC包装器的指针对象永远不要使用 reinterpret_cast ，使用静态强制转换。

The line of code you've presented isn't getting the handle to anything - it's apparently trying to recover the pointer to a CComboBox MFC wrapper object that's a child of the window that supplies the this pointer the code is executed under.

So...

IF you really want a pointer to the MFC wrapper object NEVER use reinterpret_cast, use static cast.

auto pComboBox = static_cast<ccombobox>( GetDlgItem( IDC_COMBO1 ) );</ccombobox>

如果你真的想要使用手柄 m_hWnd GetDlgItem 返回的成员，例如

IF you actually want the handle use the m_hWnd member of whatever is returned by GetDlgItem, e.g.

auto handle = GetDlgItem( IDC_COMBO1 )->m_Hwnd;

尝试这些代码行，看看会发生什么。如果两者都没有做你想要的，也许修改你的问题以反映你想要做的事情！

Try those lines of code and see what happens. If neither do what you want perhaps modify your question to reflect what you want to do!

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