MFC对话框消息处理程序中的异常 [英] Exception in MFC dialog message handler

问题描述

嗨
我在CDialog类的OnSize()消息处理程序中有一个CInvalidArgException

Hi
I have got an CInvalidArgException in OnSize() message handler of a CDialog class

void CDlgTestAppDlg::OnSize(UINT nType, int cx, int cy)
{
    try
    {
        CDialog::OnSize(nType, cx, cy);
        m_txtImageCtrl.SetWindowText( _T( "0/0" ));
    }
    catch( CException *pExp_i )
    {
        // CInvalidArgException
        delete pExp_i;
        pExp_i = 0;
    }
}

这里m_ txtImageCtrl是CEdit的实例，编辑控件是在dailog资源中创建的.问题是OnSize()在创建OnInitDialog()之前的编辑ctrl的window(hWnd handle)之前被调用.我已使用Visual Studio 2008创建应用程序

关于如何解决此问题的任何想法

here m_txtImageCtrl is an instance of CEdit, edit control is created in dailog resource. Problem is that OnSize() is called before creating the window( hWnd handle ) of the edit ctrl that is before OnInitDialog(). I have used Visual Studio 2008 for creating the application

Any idea about how to resolve this

推荐答案

只需替换:

Just replace:

m_txtImageCtrl.SetWindowText( _T("0/0" ));

与:

with:

if (::IsWindow(m_txtImageCtrl.m_hWnd))
   m_txtImageCtrl.SetWindowText( _T( "0/0" ));

对话框启动期间，多次调用了

OnSize.只需在执行任何操作之前检查m_txtImageCtrl是否为空.

OnSize is called several times during dialog startup. Just check to see if m_txtImageCtrl is null before doing anything with it.

是的，

我的对话框中有太多控件无法归类，
除了检查手柄外，没有其他方法.

现在我为此使用了一个布尔值，它在CDialog::OnInitDialog()

Yes,

I have too many controls to be subclassed with in the dialog,
Is any other way than checking the handle.

Now I used a boolean for this, it is set to true after CDialog::OnInitDialog()

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