我最终基本上放弃了GetObject，因为它的粒度不够细，然后写了自己的无闪烁打开器，受到osknows的启发和这里和这里的优秀代码示例。我觉得如果其他人也发现它有用的话，就分享一下我的经验。首先是完整的模块：
'looping through, parent and child (see also callbacks for lpEnumFunc)
Private Declare Function EnumWindows Lib "user32.dll" (ByVal lpEnumFunc As Long, _
ByVal lParam As Long) As Long
Private Declare Function EnumChildWindows Lib "user32.dll" (ByVal hWndParent As Long, _
ByVal lpEnumFunc As Long, _
ByVal lParam As Long) As Long
'title of window
Private Declare Function GetWindowTextLength Lib "user32.dll" Alias "GetWindowTextLengthA" (ByVal hWnd As Long) As Long
Private Declare Function GetWindowText Lib "user32.dll" Alias "GetWindowTextA" (ByVal hWnd As Long, _
ByVal lpString As String, _
ByVal cch As Long) As Long
'class of window object
Private Declare Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hWnd As Long, _
ByVal lpClassName As String, _
ByVal nMaxCount As Long) As Long
'control window display
Private Declare Function ShowWindow Lib "user32" (ByVal lHwnd As Long, _
ByVal lCmdShow As Long) As Boolean
Private Declare Function BringWindowToTop Lib "user32" (ByVal hWnd As Long) As Long
Private Declare Function SetFocus Lib "user32" (ByVal hWnd As Long) As Long
Public Enum swcShowWindowCmd
swcHide = 0
swcNormal = 1
swcMinimized = 2 'but activated
swcMaximized = 3
swcNormalNoActivate = 4
swcShow = 5
swcMinimize = 6 'activates next
swcMinimizeNoActivate = 7
swcShowNoActive = 8
swcRestore = 9
swcShowDefault = 10
swcForceMinimized = 11
End Enum
'get application object using accessibility
Private Declare Function AccessibleObjectFromWindow Lib "oleacc" (ByVal hWnd As Long, _
ByVal dwId As Long, _
ByRef riid As GUID, _
ByRef ppvObject As Object) _
As Long
Private Declare Function IIDFromString Lib "ole32" (ByVal lpsz As Long, _
ByRef lpiid As GUID) As Long
'Const defined in winuser.h
Private Const OBJID_NATIVEOM As Long = &HFFFFFFF0
'IDispath pointer to native object model
Private Const Guid_Excel As String = "{00020400-0000-0000-C000-000000000046}"
Private Type GUID
Data1 As Long
Data2 As Integer
Data3 As Integer
Data4(7) As Byte
End Type
'class names to search by (Excel, in this example, is XLMAIN)
Private mstrAppClass As String
'title (a.k.a. pathless filename) to search for
Private mstrFindTitle As String
'resulting handle outputs - "default" app instance and child with object
Private mlngFirstHwnd As Long
Private mlngChildHwnd As Long
'------
'replacement GetObject
'------
Public Function GetExcelWbk(pstrFullName As String, _
Optional pbleShow As Boolean = False, _
Optional pbleWasOpenOutput As Boolean) As Object
Dim XLApp As Object
Dim xlWbk As Object
Dim strWbkNameOnly As String
Set XLApp = GetExcelAppForWbkPath(pstrFullName, pbleWasOpenOutput)
'other stuff can be done here if the app needs to be prepared for the load
If pbleWasOpenOutput = False Then
'load it, without flicker, if you plan to show it
If pbleShow = False Then
XLApp.ScreenUpdating = False
End If
Set xlWbk = XLApp.Workbooks.Open(pstrFullName)
Else
'get it by its (pathless, if saved) name
strWbkNameOnly = PathOrFileNm("FileNm", pstrFullName)
Set xlWbk = XLApp.Workbooks(strWbkNameOnly)
End If
Set GetExcelWbk = xlWbk
Set xlWbk = Nothing
Set XLApp = Nothing
End Function
Private Function GetExcelAppForWbkPath(pstrFullName As String, _
pbleWbkWasOpenOutput As Boolean, _
Optional pbleLoadAddIns As Boolean = True) As Object
Dim XLApp As Object
Dim bleAppRunning As Boolean
Dim lngHwnd As Long
'get a handle, and determine whether it's for a workbook or an app instance
lngHwnd = WbkOrFirstAppHandle(pstrFullName, pbleWbkWasOpenOutput)
'if a handle came back, at least one instance of Excel is running
'(this isnt' particularly useful; just check XLApp.Visible when you're done getting/opening;
'if it's a hidden instance, it wasn't running)
bleAppRunning = (lngHwnd > 0)
'get an app instance.
Set XLApp = GetAppForHwnd(lngHwnd, pbleWbkWasOpenOutput, pbleLoadAddIns)
Set GetExcelAppForWbkPath = XLApp
Set XLApp = Nothing
Exit Function
End Function
Private Function WbkOrFirstAppHandle(pstrFullName As String, _
pbleIsChildWindowOutput As Boolean) As Long
Dim retval As Long
'defaults
mstrAppClass = "XLMAIN"
mstrFindTitle = PathOrFileNm("FileNm", pstrFullName)
mlngFirstHwnd = 0
mlngChildHwnd = 0
'find
retval = EnumWindows(AddressOf EnumWindowsProc, 0)
If mlngChildHwnd > 0 Then
pbleIsChildWindowOutput = True
WbkOrFirstAppHandle = mlngChildHwnd
Else
WbkOrFirstAppHandle = mlngFirstHwnd
End If
'clear
mstrAppClass = ""
mstrFindTitle = ""
mlngFirstHwnd = 0
mlngChildHwnd = 0
End Function
Private Function GetAppForHwnd(plngHWnd As Long, _
pbleIsChild As Boolean, _
pbleLoadAddIns As Boolean) As Object
On Error GoTo HandleError
Dim XLApp As Object
Dim AI As Object
If plngHWnd > 0 Then
If pbleIsChild = True Then
'get the parent instance using accessibility
Set XLApp = GetExcelAppForHwnd(plngHWnd)
Else
'get the "default" instance
Set XLApp = GetObject(, "Excel.Application")
End If
Else
'no Excel running
Set XLApp = CreateObject("Excel.Application")
If pbleLoadAddIns = True Then
'explicitly reload add-ins (automation doesn't)
For Each AI In XLApp.AddIns
If AI.Installed Then
AI.Installed = False
AI.Installed = True
End If
Next AI
End If
End If
Set GetAppForHwnd = XLApp
Set AI = Nothing
Set XLApp = Nothing
Exit Function
End Function
'------
'API wrappers and utilities
'------
Public Function uWindowClass(ByVal hWnd As Long) As String
Dim strBuffer As String
Dim retval As Long
strBuffer = Space(256)
retval = GetClassName(hWnd, strBuffer, 255)
uWindowClass = Left(strBuffer, retval)
End Function
Public Function uWindowTitle(ByVal hWnd As Long) As String
Dim lngLen As Long
Dim strBuffer As String
Dim retval As Long
lngLen = GetWindowTextLength(hWnd) + 1
If lngLen > 1 Then
'title found - pad buffer
strBuffer = Space(lngLen)
'...get titlebar text
retval = GetWindowText(hWnd, strBuffer, lngLen)
uWindowTitle = Left(strBuffer, lngLen - 1)
End If
End Function
Public Sub uShowWindow(ByVal hWnd As Long, _
Optional pShowType As swcShowWindowCmd = swcRestore)
Dim retval As Long
retval = ShowWindow(hWnd, pShowType)
Select Case pShowType
Case swcMaximized, swcNormal, swcRestore, swcShow
BringWindowToTop hWnd
SetFocus hWnd
End Select
End Sub
Private Function EnumWindowsProc(ByVal hWnd As Long, ByVal lParam As Long) As Long
Dim strThisClass As String
Dim strThisTitle As String
Dim retval As Long
Dim bleMatch As Boolean
'mlngWinCounter = mlngWinCounter + 1
'type of window is all you need for parent
strThisClass = uWindowClass(hWnd)
bleMatch = (strThisClass = mstrAppClass)
If bleMatch = True Then
strThisTitle = uWindowTitle(hWnd)
'Debug.Print "Window #"; mlngWinCounter; " : ";
'Debug.Print strThisTitle; "(" & strThisClass & ") " & hWnd
If mlngFirstHwnd = 0 Then mlngFirstHwnd = hWnd
'mlngChildWinCounter 0
retval = EnumChildWindows(hWnd, AddressOf EnumChildProc, 0)
If mlngChildHwnd > 0 Then
'If mbleFindAll = False And mlngChildHwnd > 0 Then
'stop EnumWindows by setting result to 0
EnumWindowsProc = 0
Else
EnumWindowsProc = 1
End If
Else
EnumWindowsProc = 1
End If
End Function
Private Function EnumChildProc(ByVal hWnd As Long, ByVal lParam As Long) As Long
Dim strThisClass As String
Dim strThisTitle As String
Dim retval As Long
Dim bleMatch As Boolean
strThisClass = uWindowClass(hWnd)
strThisTitle = uWindowTitle(hWnd)
If Len(mstrFindTitle) > 0 Then
bleMatch = (strThisTitle = mstrFindTitle)
Else
bleMatch = True
End If
If bleMatch = True Then
mlngChildHwnd = hWnd
EnumChildProc = 0
Else
EnumChildProc = 1
End If
End Function
Public Function GetExcelAppForHwnd(pChildHwnd As Long) As Object
Dim o As Object
Dim g As GUID
Dim retval As Long
'for child objects only, e.g. must use a loaded workbook to get its parent Excel.Application
'make a valid GUID type
retval = IIDFromString(StrPtr(Guid_Excel), g)
'get
retval = AccessibleObjectFromWindow(pChildHwnd, OBJID_NATIVEOM, g, o)
If retval >= 0 Then
Set GetExcelAppForHwnd = o.Application
End If
End Function
Public Function PathOrFileNm(pstrPathOrFileNm As String, _
pstrFileNmWithPath As String)
On Error GoTo HandleError
Dim i As Integer
Dim j As Integer
Dim strChar As String
If Len(pstrFileNmWithPath) > 0 Then
i = InStrRev(pstrFileNmWithPath, "\")
If i = 0 Then
i = InStrRev(pstrFileNmWithPath, "/")
End If
If i > 0 Then
Select Case pstrPathOrFileNm
Case "Path"
PathOrFileNm = Left(pstrFileNmWithPath, i - 1)
Case "FileNm"
PathOrFileNm = Mid(pstrFileNmWithPath, i + 1)
End Select
ElseIf pstrPathOrFileNm = "FileNm" Then
PathOrFileNm = pstrFileNmWithPath
End If
End If
End Function
接下来是一些样例/测试代码。
Public Sub Test_GetExcelWbk()
Dim MyXLApp As Object
Dim MyXLWbk As Object
Dim bleXLWasRunning As Boolean
Dim bleWasOpen As Boolean
Const TESTPATH As String = "C:\temp\MyFlickerbook.xlsx"
Const SHOWONLOAD As Boolean = False
Set MyXLWbk = GetExcelWbk(TESTPATH, SHOWONLOAD, bleWasOpen)
If Not (MyXLWbk Is Nothing) Then
Set MyXLApp = MyXLWbk.Parent
bleXLWasRunning = MyXLApp.Visible
If SHOWONLOAD = False Then
If MsgBox("Show " & TESTPATH & "?", vbOKCancel) = vbOK Then
MyXLApp.Visible = True
MyXLApp.Windows(MyXLWbk.Name).Visible = True
End If
End If
If bleWasOpen = False Then
If MsgBox("Close " & TESTPATH & "?", vbOKCancel) = vbOK Then
MyXLWbk.Close SaveChanges:=False
If bleXLWasRunning = False Then
MyXLApp.Quit
End If
End If
End If
End If
Set MyXLWbk = Nothing
Set MyXLApp = Nothing
End Sub
希望其他人也能从中受益。
