动态建立弹出式菜单技术及其应用示例

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建立一个标准EXE新工程，在窗体上添加一个Listbox和一个Text控件。

然后在窗体中粘贴下面代码：（窗体代码）

Option Explicit

Private Sub Form_Load()
    List1.AddItem "使用鼠标右键单击这里"
End Sub

Private Sub List1_MouseUp(Button As Integer, Shift As Integer, x As Single, y As Single)
    Dim cMenu As cPopupMenu
    Dim ret As Long
    If Button = vbRightButton Then
        Set cMenu = New cPopupMenu
        ret = cMenu.Popup("撤销", "-", "剪切", "复制", "粘贴", "删除")
        Text1.Text = ret
    End If
End Sub

然后在工程中添加一个新类，名称为：cPopupMenu
然后在类cPopupMenu的代码窗体中粘贴如下代码：

Option Explicit

Private Type POINT
    x As Long
    y As Long
End Type

Private Const MF_ENABLED = &H0&
Private Const MF_DISABLED = &H2&
Private Const MF_SEPARATOR = &H800&
Private Const MF_STRING = &H0&
Private Const TPM_RIGHTBUTTON = &H2&
Private Const TPM_LEFTALIGN = &H0&
Private Const TPM_NONOTIFY = &H80&
Private Const TPM_RETURNCMD = &H100&

Private Declare Function GetCursorPos Lib "user32" (lpPoint As POINT) As Long
Private Declare Function GetForegroundWindow Lib "user32" () As Long

Private Declare Function CreatePopupMenu Lib "user32" () As Long
Private Declare Function AppendMenu Lib "user32" Alias "AppendMenuA" (ByVal hMenu As Long, ByVal wFlags As Long, ByVal wIDNewItem As Long, ByVal sCaption As String) As Long
Private Declare Function TrackPopupMenu Lib "user32" (ByVal hMenu As Long, ByVal wFlags As Long, ByVal x As Long, ByVal y As Long, ByVal nReserved As Long, ByVal hwnd As Long, nIgnored As Long) As Long
Private Declare Function DestroyMenu Lib "user32" (ByVal hMenu As Long) As Long

Public Function Popup(ParamArray param()) As Long
    Dim iMenu As Long
    Dim hMenu As Long
    Dim nMenus As Long
    Dim p As POINT
    GetCursorPos p '得到当前光标位置
    hMenu = CreatePopupMenu()  '创建一个空的弹出式菜单
    nMenus = 1 + UBound(param) '得到菜单数目
    For iMenu = 1 To nMenus
        If Trim$(CStr(param(iMenu - 1))) = "-" Then '画分隔符号
            AppendMenu hMenu, MF_SEPARATOR, iMenu, ""
        Else
            AppendMenu hMenu, MF_STRING + MF_ENABLED, iMenu, CStr(param(iMenu - 1))
        End If
    Next iMenu
    'TrackPopupMenu 函数返回用户选择的菜单项目或者取消选择
    iMenu = TrackPopupMenu(hMenu, TPM_RIGHTBUTTON + TPM_LEFTALIGN + TPM_NONOTIFY + TPM_RETURNCMD, p.x, p.y, 0, GetForegroundWindow(), 0)
    DestroyMenu hMenu '释放hMenu
    Popup = iMenu '返回选择的菜单索引号，取消选择时候返回0
End Function

然后保存工程，按F5运行，用鼠标点击看看，是不是有菜单出现了？

                                                                     ---by 唐细刚 2004-7-9

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