Edit box in dialog box cannot return data in single document view with split view

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I used VC to build a single document application with a split bar, and used the wizard to create a dialog class CFindDlg, and set an edit box on the dialog box to enter a string, and the corresponding member variable of the edit box is CString M_find of the class,
    A button is set on the toolbar, and the message processing is set in the CMyView class, which is used to click the pop-up dialog box
void CMyView :: OnButton32771 () // Message processing function
{
CFindDlg m_FindDlg;
m_FindDlg.DoModal // DoModal is used to create a modal dialog box
m_FindDlg.m_find; // m_find cannot return the edit box data in the dialog box
}

    If the message processing function is set in the main frame CMainFrame class, or in the single document program CMyView class without splitter, there is no problem. My problem is that if the message processing function is set in the CMyView class of my program, m_find cannot I received the data in the edit box.Why? If you want to study, you can provide a program.

2511718

CFindDlg m_FindDlg;
m_FindDlg.DoModal // will not execute until the next statement before this dialog exits
m_FindDlg.m_find;

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Reply to2511718:

m_FindDlg.DoModal // When executed, a dialog box will pop up. I enter the string and press OK to exit the dialog box.
m_FindDlg.m_find; // Set breakpoint here to see if there is no data

Reply to wenbaby (雯贝贝):
The program will be sent to your email now, help me debug and see if there is any problem, thank you first

2511718

That is the problem with your code

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2511718:

I set the same message processing function in the CMainFrame class of the main frame.

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The reason is roughly found:
    Deleted my previous debugging directory Debug, it is normal, it should be that the debug file generated before adding the dialog box has an impact on the debugging after adding the dialog box.
    Therefore, when solving programming problems that arise, if you repeatedly check that your code has no problems, you should expand your thinking to solve the problem.