Microsoft KB Archive/191508

= PRB: Confusing Return Values from DDE topic WWW_ListWindows =

Article ID: 191508

Article Last Modified on 5/9/1999

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APPLIES TO


 * Microsoft Internet Explorer 4.0 128-Bit Edition
 * Microsoft Internet Explorer 4.01 Service Pack 2
 * Microsoft Internet Explorer 4.01 Service Pack 1

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This article was previously published under Q191508



SYMPTOMS
Sending the DDE topic WWW_ListWindows to IExplore (Internet Explorer) returns an array of DWORDS containing a sequence of integers 1-n, not the HWNDs of windows opened by the Browser as implied in the documentation.



CAUSE
What is being returned is a sequence corresponding to the number of instances of the Browser that are currently opened. For instance, if three instances of Internet Explorer are running, then the WWW_ListWindows topic will return, to the caller, an array of DWORD's containing the integers 1, 2, 3.



RESOLUTION
The WWW_ListWindows topic can only be used to determine the number of instances of the browser that are running. To determine the windows owned for each instance, an API call such as FindWindows must be used. General information on finding and enumerating windows is available in the MSDN article "Win32 Window Hierarchy and Styles" by Kyle Marsh.

