MFC closes the parent window through a child window to implement the exit program

This should be an old question, I would like to summarize the following: (I just touch windows programming I hope you have a lot of advice)

1. Come up with one of the most reckless.

Directly through exit (0), exitprocess (0); //Bad usage

Guessing that resources are not recycled

The reasons are as follows:

http://blog.csdn.net/jiang1013nan/article/details/4831020

2. Send the WM_CLOSE message to the parent window, and then close your own window.

Gets the handle of the parent window passed directly to the child window, and the child window can close the parent window directly.

The sample code is as follows:

Definition of the parent window class:

Cmfc_biometic_authenticationdlg dialog box class Cmfc_biometic_authenticationdlg:public cdialogex{//construction public:cmfc_ Biometic_authenticationdlg (cwnd* pparent = NULL);//Standard constructor//dialog data enum {IDD = Idd_mfc_biometic_authentication_dialog}; protected:virtual void DoDataExchange (cdataexchange* pDX);//DDX/DDV support//implement Protected:hicon m_hicon;// Generated message map function virtual BOOL OnInitDialog (); afx_msg void OnSysCommand (UINT NID, LPARAM LPARAM); afx_msg void OnPaint (); afx_msg Hcursor Onquerydragicon ();D eclare_message_map () public:afx_msg void OnBnClickedOK (); afx_msg void Onstnclickedpasswordtipsstatic (); afx_msg void Onstnclickedusernamestatic (); afx_msg void OnEnChangeEdit3 (); afx_msg void Onenchangefingertipsedit ();p rivate:cstring m_username;private:cstring m_password;private:cstring M_message_ return;public:afx_msg void Onbnclickedokbutton (); afx_msg void Onstnclickedpassmessagestatic (); afx_msg void Onbnclickedinstructionlog ();p rivate:cuserdialog m_userlog;public:afx_msg void OnClose ();};

Definition of child window class

Class Cuserdialog:public Cdialogex{declare_dynamic (Cuserdialog) public:cuserdialog (cwnd* pParent = NULL);   The standard constructor virtual ~cuserdialog ();//Dialog data enum {IDD = idd_user_dialog};p rotected:virtual void DoDataExchange ( cdataexchange* PDX);    

CWnd *m_pparentwnd; A pointer in the child window class to store the parent window

Important step: Pass the pointer to the child window (through the constructor):

Cuserdialog::cuserdialog (cwnd* pparent/*=null*/): CDialogEx (Cuserdialog::idd, pparent), M_pParentWnd (pParent) {}

The process of closing is by: SendMessage (...);

void Cuserdialog::onclose () {//TODO:  Add the message handler code here and/or call the default value//exitprocess (0);//::D Estroywindow (m_ pParentWnd);:: SendMessage (M_pparentwnd->m_hwnd, wm_close, 0, 0); Cdialogex::onclose ();}

3. Another suggested practice,use a global variable to indicate whether you want to exit the program, assign a value in the child window, and when the child window is called, the parent window determines whether to exit the program at the call. (Have not tried, welcome to do friends message, posted important code or private messages i) Thank you very much ~ ~

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MFC closes the parent window through a child window to implement the exit program