IP地址输入控件 V1.0.1.1版(FOR Win Form)

博客给出了一段核心代码,用于控制TextBox控件的输入。只允许输入数字和“.”,对输入“.”和数字的情况做了处理,如在特定文本框输入“.”相当于按Tab键,还对退格键进行了控制,当文本框为空按退格键时会切换焦点。

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核心代码:

 '只允许输入数字、"."
    Private Sub txtField_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtField0.KeyPress, txtField1.KeyPress, txtField2.KeyPress, txtField3.KeyPress
        If e.KeyChar = "." Then
            Dim tx As TextBox = CType(sender, TextBox)
            '最后的文本框不可以输入"."
            '在其它文本框输入".",相当于输入"Tab"键,即光标到下一文本框
            If tx.Text = "" Or tx.SelectedText <> "" Then
                e.Handled = True
            End If
            If tx.Name <> "txtField3" Then
                SendKeys.Send("{TAB}")
            Else
                '最后的文本框不可以输入"."
                e.Handled = True
            End If
        ElseIf (Not IsNumeric(e.KeyChar)) And e.KeyChar <> ControlChars.Back Then
            e.Handled = True
        Else
            Dim tx As TextBox = CType(sender, TextBox)
            If (Len(tx.Text) = 2 And e.KeyChar <> ControlChars.Back And tx.SelectedText.Length = 0) Then
                If tx.Name <> "txtField3" Then
                    SendKeys.Send("{TAB}")
                End If
            End If
        End If
        '控制ControlChars.Back退格键
        Dim tx1 As TextBox = CType(sender, TextBox)
        If (Len(tx1.Text) = 0 And e.KeyChar = ControlChars.Back) Then
            Select Case tx1.Name
                Case "txtField3"
                    If txtField3.Text = "" Then
                        txtField2.Focus()
                    End If
                Case "txtField2"
                    If txtField2.Text = "" Then
                        txtField1.Focus()
                    End If
                Case "txtField1"
                    If txtField1.Text = "" Then
                        txtField0.Focus()
                    End If
            End Select
        End If
    End Sub

当运行时:

当出现错误时:
 

自己定义的ip地址控件,好用 #include "stdafx.h" #include "IPTest.h" #include "IPTestDlg.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif ///////////////////////////////////////////////////////////////////////////// // CIPTestApp BEGIN_MESSAGE_MAP(CIPTestApp, CWinApp) //{{AFX_MSG_MAP(CIPTestApp) // NOTE - the ClassWizard will add and remove mapping macros here. // DO NOT EDIT what you see in these blocks of generated code! //}}AFX_MSG ON_COMMAND(ID_HELP, CWinApp::OnHelp) END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CIPTestApp construction CIPTestApp::CIPTestApp() { // TODO: add construction code here, // Place all significant initialization in InitInstance } ///////////////////////////////////////////////////////////////////////////// // The one and only CIPTestApp object CIPTestApp theApp; ///////////////////////////////////////////////////////////////////////////// // CIPTestApp initialization BOOL CIPTestApp::InitInstance() { // Standard initialization // If you are not using these features and wish to reduce the size // of your final executable, you should remove from the following // the specific initialization routines you do not need. #ifdef _AFXDLL Enable3dControls(); // Call this when using MFC in a shared DLL #else Enable3dControlsStatic(); // Call this when linking to MFC statically #endif CIPTestDlg dlg; m_pMainWnd = &dlg; int nResponse = dlg.DoModal(); if (nResponse == IDOK) { // TODO: Place code here to handle when the dialog is // dismissed with OK } else if (nResponse == IDCANCEL) { // TODO: Place code here to handle when the dialog is // dismissed with Cancel } // Since the dialog has been closed, return FALSE so that we exit the // application, rather than start the application's message pump. return FALSE; }
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