Visual C + + Pragmatic programming 280 Chapter I Windows 1.2 getting pointers to the main application window

Code:

1 voidcclass_twodlg::ontest ()2 {3     //Todo:add your control notification handler code here4     //get a pointer to the Cclass_twoapp class5cclass_twoapp* Papp = (cclass_twoapp*) AfxGetApp ();6     //Create pointer variable gets to the pointer let him point to the member m_pMainWnd7cwnd* pMainWnd =papp->m_pMainWnd;8     //Create a CString variable to assign an empty value9CString StrText =_t ("");Ten     //formatting text OneStrtext.format ("pmainwnd=ox%x\nthis=ox%x\n", pMainWnd, This); A     //display text - AfxMessageBox (strText); -  the}

Gets a pointer to the application's main window.

Call Function:

AfxGetApp (); Returns the application pointer without parameters

Calling member variables

m_pMainWnd;

Because Papp is a pointer, he can access the parent class of the derived class: For more information, learn C + +.

Visual C + + Pragmatic programming 280 Chapter I Windows 1.2 getting pointers to the main application window