拦截 VB TextBox 双击消息

最新推荐文章于 2021-06-23 02:27:35 发布

原创最新推荐文章于 2021-06-23 02:27:35 发布 · 231 阅读

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本文介绍如何在Visual Basic中为TextBox控件添加双击事件处理程序。通过使用API函数重新定义窗口过程，捕获并处理双击消息。

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我们都知道在VB中TextBox默认是没有双击消息过程的(也就是双击事件,单击事件是有的.)，那么看看本文是怎么实现TextBox双击消息的吧。

Option Explicit

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

Public Const GWL_WNDPROC = (-4)
Public Const WM_NCLBUTTONDBLCLK = &H203 'DoubleClick Message
Public prevWndProc As Long

Public Function WndProc(ByVal hwnd As Long, ByVal msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
If msg = WM_NCLBUTTONDBLCLK Then 'DoubleClick Message
'Eat The Message
Else 'Other Message send to next
WndProc = CallWindowProc(prevWndProc, hwnd, msg, wParam, lParam)
End If
End Function

'*************************************************************************
'**主要函数
'*************************************************************************
Public Sub TxtDoubleClickMassage(Frm As Form)
Dim i As Integer
For i = 0 To 9 '
'区分符号
prevWndProc = GetWindowLong(Frm.txtKairo(i).hwnd, GWL_WNDPROC)
SetWindowLong Frm.txtKairo(i).hwnd, GWL_WNDPROC, AddressOf WndProc
'名称1
prevWndProc = GetWindowLong(Frm.txtIkisaki1(i).hwnd, GWL_WNDPROC)
SetWindowLong Frm.txtIkisaki1(i).hwnd, GWL_WNDPROC, AddressOf WndProc
'名称2
prevWndProc = GetWindowLong(Frm.txtIkisaki2(i).hwnd, GWL_WNDPROC)
SetWindowLong Frm.txtIkisaki2(i).hwnd, GWL_WNDPROC, AddressOf WndProc
Next
End Sub