how to return value after user input
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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 windowclass 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 functionsprotected:
//{{AFX_MSG(CMyTextBox)
afx_msg void OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags);
//}}AFX_MSGDECLARE\_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
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.
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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.
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.
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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
CEditclasses offer other methods and events for checking the content, and theCDialogclass offers theUpdateData()[^] method to capture all fields.One of these days I'm going to think of a really clever signature.
well, this is what i have to complete task. it is required.
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well, this is what i have to complete task. it is required.
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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.
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.
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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.
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.
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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.
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
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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
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.
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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.
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.
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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.
no no. this is not a way what i need. i need to get value after press Enter Key.
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no no. this is not a way what i need. i need to get value after press Enter Key.
"After press Enter key" I can undestand that you need to get the String and Number values on pressing Enter key.is it right ?
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"After press Enter key" I can undestand that you need to get the String and Number values on pressing Enter key.is it right ?
Yes. when it call function. like GetString();
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Yes. when it call function. like GetString();
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);}
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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);}
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.
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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.
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.
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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.
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.
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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.
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.
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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.
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.
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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.
Member 2119844 wrote:
hoping to get help from some kind heart.
Which is what I offered to you yesterday. Use the features of the CDialog and its controls rather than struggling to try and interpret individual keystrokes that are already captured for you. Text boxes have events that you can capture as characters are entered into them, which allow you to check and/or modify their content. The CDialog class has a function that will capture or refresh all the data between the dialog and the associated class variables etc.
One of these days I'm going to think of a really clever signature.
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Member 2119844 wrote:
hoping to get help from some kind heart.
Which is what I offered to you yesterday. Use the features of the CDialog and its controls rather than struggling to try and interpret individual keystrokes that are already captured for you. Text boxes have events that you can capture as characters are entered into them, which allow you to check and/or modify their content. The CDialog class has a function that will capture or refresh all the data between the dialog and the associated class variables etc.
One of these days I'm going to think of a really clever signature.
Dear sir, i really appreciate your and Santhosh suggestion. i do. but the thing is bit difference what i am looking for. maybe i am not able to describe very well, what i am looking for. sorry for that. because my English is not good enough. so please don't get me wrong. once again i am trying to explain what i need to do. and what i come up to. i need to make function that return value after press Enter key. not directly and not in any other way. but from function when it call from outer class. this is the event when user press button in dlg class.
void CRetValTestDlg::OnGetString()
{
m_TxInput.InFlag = false;
CString s = m_TxInput.GetString();
m_TxOutput.SetWindowText (s);
}and this is CMyTextBox calss member function which is call from dlg class on button press. which need to return value.
CString CMyTextBox::GetString()
{
if (InFlag == true)
return RetVal;
return "";
}now i have come upto this
CString CMyTextBox::GetString()
{
while (InFalg != true) // this is infinite loop but
{
DoEvents(); // doEvents hole for it so it wait until it get event
if (InFlag == true) // the InFlag = true when user press Enter;
return RetVal; // and return value
}
return ""; // else return "";
}this is work. but when i use While and DoEvents the processor took lot of work. it took all most 50% of CPU used. and which is really not good. i think. and some time it does not come out from that loop when user left so when the program close. it remain in task manager. and CUP running. now What i am looking for is -> is there any other way to wait till event. maybe using CEvent or CallBack or threading or something else. without using lot of CPU used. because i don't know anything about them. i have never use.
CString CMyTextBox::GetString()
{
//====================== Here i am looking for help =============================
// wait for event here or WaitTill (InFlag !=true); in this line i need help.
//==================================================================================
if (InFlag == true)
return RetVal;
return "";
}i hope this time i could able to tell what i need for. this is really important for me. so Please Please Help.