WD97: Timing Problem Getting Object Via OLE Automation
ID: Q163492
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The information in this article applies to:
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Microsoft Word 97 for Windows
SUMMARY
When you use OLE automation to process calls to an application, there may
be processes occurring within that application that prevent setting the
OLE object until the application is free to process the request. This
article includes sample Visual Basic for Applications code to demonstrate
how you can use an idle loop to wait until the application is free to
process the call.
MORE INFORMATION
Microsoft provides examples of Visual Basic for Applications procedures
for illustration only, without warranty either expressed or implied,
including, but not limited to the implied warranties of merchantability
and/or fitness for a particular purpose. The Visual Basic procedures in
this article are provided 'as is' and Microsoft does not guarantee that
they can be used in all situations. While Microsoft support professionals can
help explain the functionality of a particular macro, they will not modify
these examples to provide added functionality, nor will they help you
construct macros to meet your specific needs. If you have limited
programming experience, you may want to consult one of the Microsoft
Solution Providers. Solution Providers offer a wide range of fee-based
services, including creating custom macros. For more information about
Microsoft Solution Providers, call Microsoft Customer Information Service
at (800) 426-9400.
The following example Visual Basic for Applications macro is run from
Microsoft Excel 97. The macro calls a Microsoft Access 97 Visual Basic for
Applications macro whose function is to export a query to RTF format and
import into Word for Windows.
Because Word will be busy importing the RTF file, the macro then checks to
see if Word is busy before it creates a Word OLE object. If it is, the
macro then uses a combination of an error trap, Windows Sleep and
SendMessage API calls to cycle until Word is free from the import process.
Once Word has completed the importing the file, the macro creates a Word
object to save the imported RTF data as a Word document.
Private Declare Sub SleepAPI Lib "Kernel32" Alias _
"Sleep" (ByVal dwMS As Long)
Private Declare Function SendMessage Lib "User32" Alias _
"SendMessageA" (ByVal hWnd As Integer, ByVal msg As Integer, _
ByVal wp As Integer, lp As Any) As Long
Sub ExportDataToWord()
' Set Access variables.
Dim objAccess As Object
Set objAccess = CreateObject("Access.Application")
' Run Access macro.
With objAccess
.OpenCurrentDatabase ThisWorkbook.Path & "MyData.mdb"
.Visible = True
.Run "ExportQueryToRTF"
.Quit
End With
' Set Word variables.
Dim objWord As Object
Dim cTries As Integer
' Create Word Object.
' If Word is busy, then jump to the error
' trap to cycle until Word is free.
On Error GoTo WAITFORWORD
Set objWord = GetObject(, "Word.Application")
On Error GoTo 0
' Save the document and free the Word Object.
With objWord
.Visible = True
.ActiveDocument.SaveAs FileName:=ThisWorkbook.Path & "\MyData.doc"
.Quit ' "Microsoft Word"
End With
' Clean up
Set objWord = Nothing
Exit Sub
WAITFORWORD: ' <--- This line must be left aligned.
' Force Word to register Application and Basic object.
SendMessage -1, 61, 0, 0
' Loop 25 times until Word is free
' waiting 2 seconds between tries.
If cTries < 25 Then
cTries = cTries + 1
Sleep 2 ' wait 2 seconds
Resume
Else
MsgBox "Word is taking too long. Process ended."
End If
End Sub
Sub Sleep(nSec As Integer)
' Call the Sleep API to wait the number
' of seconds specified by 'nSec'.
SleepAPI nSec * 1000
End Sub
Additional query words:
wordcon 97 word8 word97 8.0 vb vbe vba
Keywords : kbwordvba
Version : WINDOWS:
Platform : WINDOWS
Issue type :