Most often, RegSvr32.exe fails because the LoadLibrary, DllRegisterServer, or DllUnregisterServer function fails.
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I want to update you that how the RegSvr32.exe program registers and unregisters a Component Object Model (COM) dynamic-link library (DLL). Usually we – the developer customers –face the issue when you try to register. I am adding this with the respect to my previous blog post regarding error message on 64-bit windows when you try run regsvr32.exe. I recommend you also to refer pcreehan’s blogpost regarding this. Calling the Outlook object model from a background thread is not supported. When you design or develop application, the only threading model supported by Outlook object model is single-threaded apartment (STA). So all calls to the Outlook object model execute on Outlook’s main foreground thread. To isolate the issue, you can try running two instances of Outlook in same machine? Can you do that. For more information, see In-Process Server Threading Issues. There are special considerations that apply to threading in-process servers. Apartment-aware objects must also write DLL entry points carefully. DLL-based or in-process objects do not call the COM initialization functions instead, they register their threading model with the ThreadingModel named-value under the InprocServer32 key in the registry.Single-threaded apartments without objects (client only) also need a message loop to dispatch the broadcast messages that some applications use. Each single-threaded apartment must have a message loop to handle calls from other processes and apartments within the same process.Marshal all pointers to objects when passing them between apartments.Initialize the COM library for each thread.
Every object should live on only one thread (within a single-threaded apartment).In general, rules for single-threaded apartments are simple, but it is important to follow them carefully: You can safely use Thread local storage and you don’t need to use critical sections. You are guaranteed that the creation and all calls will be made by the same thread. If your COM object needs to believe that it is in a single-threaded environment, use STA. Instead, it will serialize all calls using a message-based protocol which, in turn, means that the user will not be able to interact with Outlook while your background thread is being serviced and vice-versa. Setting Up the MSI Keys for Your MAPI DLLĮxplicitly Mapping MAPI Calls to MAPI DLLsĭevelopers do complain when they use multi-threading the Outlook Object Model (OOM) API, it fails or hangs inside and outside of Outlook? The reason behind this is the Outlook Object Model is not thread safe which means that COM will never allow multiple threads to enter concurrently.
How to: Link to MAPI functions, refer (v=office.12).aspx SGriffin’s MAPI Internals: Outlook 2010 MAPI Referenceįor a list of MAPI header files, see Finding Header Information. The MAPI library file Mapi32.lib is located at Program FilesMicrosoft SDKsWindowsLib. The MAPI header files are located at Program FilesMicrosoft SDKsWindowsInclude. Note: Windows SDK is installed to Program FilesMicrosoft SDKsWindows as a component of Visual Studio.Īfter following these steps, you can view the MAPI header and library files in the following locations.
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Obtain and install Microsoft Visual Studio 2005 or a later version (optional). To install MAPI header and library files, you can try either one of the following steps:ĭownload and install Microsoft Windows SDK. Once you have installed Microsoft Windows SDK, you can access MAPI header files by using Microsoft Visual Studio 2008.īefore you can install MAPI header and library files, make sure that you have met the following prerequisite -You have a supported Windows-based operating system installed and running on your computer. Want to get and install MAPI header and library files? MAPI header and library files are included as part of the Microsoft Windows SDK.
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