VB实现屏蔽文本框右键菜单的复制、粘贴等功能的方法_VB

VB实现屏蔽文本框右键菜单的复制、粘贴等功能的方法

2021-10-11 15:36VB教程网 VB

这篇文章主要介绍了VB实现屏蔽文本框右键菜单的复制、粘贴等功能,是非常实用的一个功能,需要的朋友可以参考下

本文实例讲述了VB屏蔽文本框中的右键菜单、复制、粘贴等功能的实现方法。该功能就是禁止文本框的右键功能，造成点击鼠标右键无效。是非常常见的一类实用功能。

具体的功能模块代码如下：

				?

									'==========================================================

									'| 模 块 名 | TextBoxDisableAbility

									'| 说  明 | 禁止文本框的功能

									'==========================================================Option Explicit

									Private Declare Function SetWindowText Lib "user32" Alias "SetWindowTextA" (ByVal hwnd As Long, ByVal lpString As String) As Long

									Private Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal lpPrevWndFunc As Long, ByVal hwnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long

									Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As Long

									Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long

									Private Const GWL_WNDPROC = (-4)

									Private Const WM_CUT = &H300 '-------------剪切消息

									Private Const WM_COPY As Long = &H301 '-------------复制消息

									Private Const WM_PASTE As Long = &H302 '-------------粘贴消息

									Private Const WM_CLEAR = &H303 '-------------删除消息[右键菜单的删除]

									Private Const EM_UNDO = &HC7 '-------------撤销消息

									Private Const WM_CONTEXTMENU = &H7B '-------------右键菜单

									Private prevWndProc   As Long

									Private Function WndProc(ByVal hwnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long

									  Select Case Msg

									  Case WM_CUT, WM_COPY, WM_PASTE, WM_CLEAR, EM_UNDO, WM_CONTEXTMENU

									    '这里处理自定义的事件,最好为空

									  Case Else

									    '回调系统函数处理

									    WndProc = CallWindowProc(prevWndProc, hwnd, Msg, wParam, lParam)

									  End Select

									End Function

									Public Sub DisableAbility(TargetTextBox As TextBox)

									  '程序启动时调用这个

									  prevWndProc = GetWindowLong(TargetTextBox.hwnd, GWL_WNDPROC)

									  SetWindowLong TargetTextBox.hwnd, GWL_WNDPROC, AddressOf WndProc

									End Sub