how to return value after user input

Member 2119844

Hi All, i need to return input value after press enter. how to make it. need little help. the main think here that i have to make function that return value after press Enter. here is link of project file. https://skydrive.live.com/redir?resid=78B222720843DE16!116&authkey=!AAjKOKZHSd-q9lI i have a dialog box with 2 EditBox (m_TxInput and m_TxOutPut) and 2 Button for (GetString and GetNumber) i made class CMyTextBox for m_TxInput . here is code below. i have 2 function GetString and GetNumber in CMyTextBox Class. i am calling these function on button down in dlg.

/////////////////////////////////////////////////////////////////////////////
// CMyTextBox window

class CMyTextBox : public CEdit
{
// Construction
public:
CMyTextBox();

// Attributes
public:

// Operations
public:

bool InFlag; // After Press Enter InFlag = true;
CString RetVal; // store return value

// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CMyTextBox)
//}}AFX_VIRTUAL

// Implementation
public:
CString GetString();
double GetNumber();
virtual ~CMyTextBox();

// Generated message map functions

protected:
//{{AFX_MSG(CMyTextBox)
afx_msg void OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags);
//}}AFX_MSG

DECLARE\_MESSAGE\_MAP()

};

// CPP file======================================================

// CMyTextBox message handlers

void CMyTextBox::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{
// TODO: Add your message handler code here and/or call default
if (nFlags == 28) // Enter press
GetWindowText(RetVal);
CEdit::OnKeyDown(nChar, nRepCnt, nFlags);
}

double CMyTextBox::GetNumber()
{
// how to get return here after press enter by user
if (InFlag == true)
return atof(RetVal);
return 0;
}

CString CMyTextBox::GetString()
{
// how to get return here after press enter by user
if (InFlag == true)
return RetVal;
return "";
}

Thanks Amrit

Lost User

This is not the best way to implement a dialog. You should allow the user to fill in the various fields and then capture the data when the OK button is pressed. In general you do not need to check for key down characters, since most CEdit classes offer other methods and events for checking the content, and the CDialog class offers the UpdateData()[^] method to capture all fields.

One of these days I'm going to think of a really clever signature.

Santhosh G_

I felt three problems. 1) InFlag is always false. You have to set it to true from OnKeyDown with Enter key.

if (nFlags == 28) // Enter press
{
InFlag = true;
GetWindowText(RetVal);
}

Please ensure you added ON_WM_KEYDOWN() in message map of CMyTextBox class. 3) Normally an Edit control will not get Enter key press, On Enter keypress, focused button click action will be performed. One option is to change the style of your Edit control to Multi-line. Change MultiLine to true, or enable ES_MULTILINE for the CMyTextBox window style. Another option is to identify enter keypress from PreTranslateMessage(), if "VK_ENTER" key down is occurred from edit control set your InFlag to true.

Member 2119844

yes i have add InFlag = true; it is not working.

CString CMyTextBox::GetString()
{
// how to come here after press enter by user that is main thing
if (InFlag == true)
return RetVal;
return "";
}

it is call form dialog class here is code.

void CRetValTestDlg::OnGetString()
{
m_TxInput.InFlag = false;
CString s = m_TxInput.GetString();
m_TxOutput.SetWindowText (s);
}
void CRetValTestDlg::OnGetNumber()
{
m_TxInput.InFlag = false;
CString s;
double d = m_TxInput.GetNumber();
s.Format ("%d",d);
m_TxOutput.SetWindowText (s);
}

i would like to upload project file for review. if possible.

Member 2119844

well, this is what i have to complete task. it is required.

Lost User

Fine, you do it any way you want.

One of these days I'm going to think of a really clever signature.

Santhosh G_

Few comments. 1) First statement of CRetValTestDlg::OnGetString() set InFlag to false. Therefore m_TxInput.GetString() will return "". Move InFlag = false to CRetValTestDlg::OnGetString(). Accessing a member variable outside of class is not a good. 2) First statement of CRetValTestDlg::OnGetNumber() set InFlag to false. Therefore m_TxInput.GetString() will return 0. Move InFlag = false to CRetValTestDlg::OnGetNumber(). 3) modify CMyTextBox::OnKeyDown() like this

if (nFlags == 28) // Enter press
{
InFlag = true;
GetWindowText(RetVal);
}

Need to identify Enter KeyPress in your EditControl. 3) Normally an Edit control will not get Enter key press, On Enter keypress, focused button click action will be performed. One option is to change the style of your Edit control to Multi-line. Change MultiLine to true, or enable ES_MULTILINE for the CMyTextBox window style. Another option is to identify enter keypress from PreTranslateMessage(), if "VK_ENTER" key down is occurred from edit control set your InFlag to true.

Member 2119844

yes i did as you said. the functions does not work. because functions does not wait for Enter. The function call from outer class so that InFlag has to false until press enter but with out press enter function ends. the function is not giving chance to press Enter or type any text to Edit box.

Santhosh G_

Which function ? On every key press, CMyTextBox::OnKeyDown() will call. But Enter will not called. Its reason is "Enter" keypress will consider as Action of currently focused button. please change the MultiLine property of EditBox and check whether enter is recieved in KEyDown

Member 2119844

keyDown received Enter. that is not a problem. but if you see my code you will find that function does not wait for enter. function are (double CMyTextBox::GetNumber() and CString CMyTextBox::GetString()) they have to wait until press enter. i think the problem is this. here is link of project file. https://skydrive.live.com/redir?resid=78B222720843DE16!116&authkey=!AAjKOKZHSd-q9lI please kindly check test project.

Santhosh G_

Please move GetWindowText() to CMyTextBox::GetNumber() and CMyTextBox::GetString(). CMyTextBox::OnKeyDown() will not give text values. CRetValTestDlg::OnGetString() still calls m_TxInput.InFlag = false; Please remove it.

Member 2119844

no no. this is not a way what i need. i need to get value after press Enter Key.

Santhosh G_

"After press Enter key" I can undestand that you need to get the String and Number values on pressing Enter key.is it right ?

Member 2119844

Yes. when it call function. like GetString();

Santhosh G_

If you can override PreTranslateMessage() in your Dialog class, you can track Enter press from PreTranslateMessage().

BOOL CRetValTestDlg::PreTranslateMessage(MSG* pMsg)
{
if( pMsg->message == WM_KEYDOWN &&
pMsg->wParam == VK_RETURN &&
pMsg->hwnd == GetDlgItem( IDC_TX_INPUT )->m_hWnd)
{
// When pressing Enter key in IDC_TX_INPUT edit box, you will get control here.
// Return FALSE ensures Dialog will not process this Enter KeyPress

    // return FALSE;
}
return CDialog::PreTranslateMessage(pMsg);

}

Member 2119844

yes this is the part which i did not understand. how it goes to GetString or GetNumber function. because PreTranslateMessage in Dlg class. and GetString and GetNumber function in other class. so how it will connect with each other. and how it trap event from one class to other class function. i would like to request for little more detail and step. how it work? if that is just need to get number or string and put in variable it will be ok. but the value should return from function.

Santhosh G_

PreTranslateMessage in Dlg class. and GetString and GetNumber function in other class. so how it will connect with each other. You can directly call m_TxInput.GetString() and m_TxInput.GetNumber() from PreTranslateMessage(). If you want to send a message to CMyTextBox class, you can call PostMessage() with a USER function to the edit control.

Member 2119844

Thanks. but i don't know about it. is it possible to give one working example. it will be great help for me. please consider i am learning.

Lost User

I have been following this thread and I think you are painting yourself into a corner. You could make this so much easier for yourself by using the standard messages and notifications available to a dialog and its child controls.

One of these days I'm going to think of a really clever signature.

Member 2119844

well sir, i am just learning and doing work. i don't have much idea about it. so i request for help. i am trying this from all most a week. i google it and did not found simillar to what i am looking for. maybe because i don't have enough knowledge. so.. hoping to get help from some kind heart.