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我正在更新扫描条形码的现有应用程序,并在运行于Windows Compact Framework 3.5的VB.net中编写。该扫描仪是一款运行Windows Mobile手持设备6.5的POCKETPC。我有一个组合框DropDownStyle='DropDown'
。我想以编程方式下拉框。Windows压缩框架3.5 combobox下拉列表
我已经编写如下:
<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)
返回代码为1,但没有下拉发生。我错过了什么?