help with limiting a textboxs max chars

[senpaijay]

this is my code, if anyone can help it would be greatly appreciated

ConsoleField = CreateWindowEx(NULL, "EDIT", "", WS_CHILD | WS_BORDER | WS_VSCROLL | ES_MULTILINE | WS_VISIBLE | ES_READONLY | ES_AUTOVSCROLL, 12, 34, 343, 234, MainWindow, (HMENU)CONSOLE_WINDOW, HInstance, 0);
	HWND consoleFieldLabel = CreateWindowEx(NULL, "STATIC", "", WS_CHILD | WS_VISIBLE, 12, 9, 100, 20, MainWindow, NULL, HInstance, NULL);
	InputField = CreateWindowEx(10, "EDIT", "", WS_CHILD | WS_BORDER | ES_MULTILINE | WS_VISIBLE, 362, 34, 144, 234, MainWindow, (HMENU)INPUT_FIELD, HInstance, 0);
	HWND inputFieldLabel = CreateWindowEx(NULL, "STATIC", "", WS_CHILD | WS_VISIBLE, 359, 9, 60, 20, MainWindow, NULL, HInstance, NULL);
	SendMessage(inputFieldLabel, WM_SETTEXT, NULL, (LPARAM)"Input");
	SendMessage(consoleFieldLabel, WM_SETTEXT, NULL, (LPARAM)"Output");
	SendMessage(InputField, EM_SETLIMITTEXT, INPUT_CHAR_LIMIT, NULL);

[Igor Vartanov]

From MSDN:

Remarks

The EM_SETLIMITTEXT message limits only the text the user can enter. It does not affect any text already in the edit control when the message is sent, nor does it affect the length of the text copied to the edit control by the WM_SETTEXT message. If an application uses the WM_SETTEXT message to place more text into an edit control than is specified in the EM_SETLIMITTEXT message, the user can edit the entire contents of the edit control.

[senpaijay]

From MSDN:

So what would I need to change to get it to limit the characters?

[2kaud]

This issue only occurs when there is existing text in an edit box before the user enters text. If the need is to limit the total umber of chars in a text box (why?) then one way would be on the text box getting input focus to determine how many chars are already present in the text box and subtract that from the required max total to get the value for EM_SETLIMITTEXT.

[VictorN]

You could handle the EN_UPDATE or/and EN_CHANGE notification to correct the text and its length.
https://www.google.ch/webhp?sourceid...e+vs+en_change

[t0ast3r]

VictorN, excellent information. Thanks.

Here's how in a partially implemented form dialog I made one phone field have max length of three, and automatically tab to the next textbox. The header file has more, but the max length is in here:

void CEmployeeDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialogEx::DoDataExchange(pDX);
	DDX_Text(pDX, IDC_EMAIL_EDIT, m_EmailAddress);
	DDX_Text(pDX, IDC_PHONENUMBER_EDIT, m_Phone);
	DDV_MaxChars(pDX, m_Phone, 3);
	*** TRIM ***
}


BEGIN_MESSAGE_MAP(CEmployeeDlg, CDialogEx)
	ON_EN_MAXTEXT(IDC_PHONENUMBER_EDIT, &CEmployeeDlg::OnEnMaxtextPhonenumberEdit) ****
	*** trim ***
END_MESSAGE_MAP()


// CEmployeeDlg message handlers


void CEmployeeDlg::OnEnMaxtextPhonenumberEdit()
{
	// TODO: SELECT SECOND PHONE NUMBERfIELD
	//AfxMessageBox(_T("Eneterd 3 digits, will tabstop to next control!"));
	NextDlgCtrl();
}

In holiday spirits (lol), anyone got a killer reference to CDataExchange information, and other robust code implementation techniques as VictorN pointed?

(books, links.. or downloadable code, etc)

[Igor Vartanov]

The killer references:
Dialog Data Exchange and Validation
CDataExchange Class