SetGet control input
in [MFC]
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From: RB on 8 May 2010 11:57 What is the best way to get and set the contents of an EditControl (in a FormView) , other than using DDX. Could I use the below, and how would I get the handle of the FormView? UINT GetDlgItemText( HWND hDlg, // handle of dialog box int nIDDlgItem, // identifier of control LPTSTR lpString, // address of buffer for text int nMaxCount // maximum size of string );
From: David Ching on 8 May 2010 13:23 "RB" <NoMail(a)NoSpam> wrote in message news:eVE5mcs7KHA.3276(a)TK2MSFTNGP02.phx.gbl... > What is the best way to get and set the contents of an EditControl > (in a FormView) , other than using DDX. > Could I use the below, and how would I get the handle of the FormView? > UINT GetDlgItemText( > HWND hDlg, // handle of dialog box > int nIDDlgItem, // identifier of control > LPTSTR lpString, // address of buffer for text > int nMaxCount // maximum size of string > ); > > CFormView has a method GetDlgItemText: http://msdn.microsoft.com/en-us/library/xcws9sbs%28VS.80%29.aspx int GetDlgItemText(int nID, CString& rString ) const; -- David
From: RB on 8 May 2010 21:42 Thanks David, I did check this out and experimented with it along with CWnd::GetWindowText. I have the debugger results behind comments below. All of this code is in my ViewClass and occurs incremetally with nothing in between that is not shown. Execution comes to here from an Button Ctrl handler. The intial 444 was entered into the IDC_Editbox prior to clicking the Button. I welcome comments from everyone on these: CString rString, rString2; // the two receiving items GetDlgItemText( IDC_EditBox, rString); //rString now equals {"444"} from initial user input to editbox SetWindowText(_T("555")); GetWindowText(rString2); //rString2 now equals {"555"} from the SetWindowText GetDlgItemText( IDC_EditBox, rString); //rString still equals {"444"} however rString remains unchanged? //rString2 still equals {"555"} // Shouldn't rString have changed to 555 ?
From: RB on 8 May 2010 22:14 Actually I added a couple of lines and seemingly solved this myself but would also like comments on another question at bottom. CString rString, rString2; GetDlgItemText( IDC_EditBox, rString); //rString now equals {"444"} SetWindowText(_T("555")); GetWindowText(rString2); GetDlgItemText( IDC_EditBox, rString); //rString still equals {"444"} //rString2 still equals {"555"} SetDlgItemText(IDC_EditBox, _T("555")); GetDlgItemText( IDC_EditBox, rString); //rString now equals {"555"} //rString2 still equals {"555"} It appears that Get(or Set)DlgItem does reference the EditBox control but GetWindowText does not. Additionally I find that accessing the IDC_EditBox in this method ties the value to a string, which could be converted of course, but to actually get the value to be a double to start with you have to declare IDC_EditBox variable of double type in the class wizard. And then it would appear you would have to use DDX (?? ) to access this variable or am I missing something ?
From: Joseph M. Newcomer on 8 May 2010 22:54
See below... It is not clear why you would need an HWND at this point, and it NEVER makes sense to manipulate the contents of a dialog from outside the dialog; therefore, none of this makes any sense, If I want to get the contents of an edit control in a CFormView, I create a control variable for the control, e.g., c_Name which would be of type CEdit. I would then do CString s; c_Name.GetWindowText(s); Note that I consider the use of ::GetDlgItem to be always and forever inappropriate in MFC code, and even CWnd::GetDlgItem should be used no more than about once a year, assuming you can write a hundred or more lines of code an hour (if you write more slowly, it might be once every two or three years you need it) SetWindowText will set the text. joe On Sat, 8 May 2010 11:57:22 -0400, "RB" <NoMail(a)NoSpam> wrote: >What is the best way to get and set the contents of an EditControl >(in a FormView) , other than using DDX. >Could I use the below, and how would I get the handle of the FormView? > UINT GetDlgItemText( > HWND hDlg, // handle of dialog box > int nIDDlgItem, // identifier of control > LPTSTR lpString, // address of buffer for text > int nMaxCount // maximum size of string > ); > Joseph M. Newcomer [MVP] email: newcomer(a)flounder.com Web: http://www.flounder.com MVP Tips: http://www.flounder.com/mvp_tips.htm |