帮我在不同对话框的两个控制变量之间传递字符串 [英] Help me passing string between two control variables of different dialogs

问题描述

伙计们，m_strMessage是我父类的一个名为CsocketDlg的控件变量。 m_sFrameLB是我的无模式MFC类的控件变量，名为CSetThresholdFineDfLB。现在通过检查条件，我想将存储在m_sFrameLB中的字符串传递给m_strMessage。我应该在我的孩子无模式对话框的按钮下编写此代码。这是我的代码：

Guys, m_strMessage is a control variable of my parent class named CsocketDlg. And m_sFrameLB is a control variable of my modeless MFC class named CSetThresholdFineDfLB. Now by checking a conditon I wanna pass a string that is stored in m_sFrameLB to m_strMessage. i should write this code under a buttonclick of my child modeless dialog. Here is my code:

void CSetThresholdFineDfLB::OnClickedIdapply()
{
    // TODO: Add your control notification handler code here
      //CString commandcodelb,framelb;
      //int tvlb;
     // commandcodelb = m_sCommandCode;
      //tvlb = m_iThresholdValue;

      if(m_iThresholdValue==0)
      {

          SetDlgItemText(IDC_FineDfLBFrame, _T("C901A3"));
          CsocketDlg.m_strMessage = m_sFrameLB;

      }
      else
          SetDlgItemText(IDC_FineDfLBFrame, _T("INVALID TV"));

     // UpdateData(FALSE);
}

当我写这行CsocketDlg.m_strMessage = m_sFrameLB;时，我收到错误：

a non static成员引用必须与特定对象相关。请帮我。我还在child.cpp文件中包含父类头文件。

When i wrote this line "CsocketDlg.m_strMessage = m_sFrameLB;", I got the error:
a non static member reference must be relative to a specific object. Please help me. Also I included parent class header file in child.cpp file.

推荐答案

请参阅我对该问题的评论。你似乎不明白哪些类是什么，为什么要使用它们。我可以回答，但我不认为它可以帮助你，除非你退后一步，至少学习一下课程及其实例，以及静态。

Please see my comment to the question. It's quite appear that you don't understand what classes are and why do you use them. I can answer, but I don't think it can help you unless you step back and learn at least a bit about classes and their instances, and also about "static".

// It cannot compile because m_strMessage is non-static. It belongs to instance, not class: 
//CsocketDlg.m_strMessage = m_sFrameLB;

// you need some instance:
CsocketDlg myDlg = // whatever
myDlg.m_strMessage = //... will compile

// of
CsocketDlg * myDlgPointer = // whatever
myDlgPointer -> m_strMessage = //... will compile

但您还需要足够的访问权限。或者，你可以有 static 字段，可以通过课程访问 - 不推荐！解释原因还为时过早;首先，你需要了解课程。此刻，你没有任何线索。别担心，你很快就会学到它。就这么做。

-SA

But you also need enough access to this member. Alternatively, you could have static field, which could be accessed via the class — not recommended! It's too early to explain why; first, you need to learn about classes. At this moment, you have no clue. Don't worry, you will learn it soon. Just do it.

—SA

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