CoInitialize() May Cause OLE Applications to Stop Responding
ID: Q159273
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The information in this article applies to:
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Microsoft Windows NT 3.1
-
Microsoft Windows NT Advanced Server, version 3.1
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Microsoft Windows NT Workstation versions 3.5, 3.51
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Microsoft Windows NT Server versions 3.5, 3.51, 4.0
SYMPTOMS
After a Windows OLE application (such as Date/Time in Control Panel) issues
a SendMessage(HWND_BRAODCAST) to a console application, the Windows OLE
application appears to stop responding.
CAUSE
The console application does not have a Windows message loop.
If a console application calls CoInitialize() to initialize the Component
Object Model (COM) library, it does not have a Windows message queue. This
causes OLE applications to stop responding while they are waiting for the
console application to process their messages. The basic assumption with
OLE is that OLE applications are Windows applications, and that they
process messages on a regular basis.
WORKAROUND
To work around this problem, do either of the following:
- Make sure your console application has an active Windows message loop.
-or-
- In Windows NT 4.0, instead of using CoIninitialize(), write your code to
call CoInitializeEx(NULL, COINIT_MULTITHREADED), which does not use
Windows messages for object remote procedure calls (RPCs).
Additional query words:
prodnt prodsna 2.11 hang hung crash fail RPC call
Keywords : kbinterop kbnetwork ntnetserv ntprotocol NTSrvWkst
Version : winnt:3.1,3.5,3.51,4.0; :3.1
Platform : winnt
Issue type : kbprb