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我正在更新掃描條形碼的現有應用程序,並在運行於Windows Compact Framework 3.5的VB.net中編寫。該掃描儀是一款運行Windows Mobile手持設備6.5的POCKETPC。我有一個組合框DropDownStyle='DropDown'
。我想以編程方式下拉框。Windows壓縮框架3.5 combobox下拉列表
我已經編寫如下:
<DllImport("coredll.dll", SetLastError:=True)> _
Public Shared Function SendMessage(ByVal hWnd As IntPtr, _
ByVal Msg As Integer, _
ByVal wParam As Integer, _
ByVal lParam As Integer) As IntPtr
End Function
Const CB_SHOWDROPDOWN As Int32 = &H14F
SendMessage(cmbVisitoringUnit.Handle, CB_SHOWDROPDOWN, 1, 0)
返回代碼爲1,但沒有下拉發生。我錯過了什麼?