com

Note: For background information please see this related question: How to get LINQPad to Dump() System.__ComObject references? I am able to retrieve the CLSID of the RCW class corresponding to a COM object (obtained from another COM object, not initialized by my code) using IPersist.GetClassID() . Type.GetTypeFromCLSID() always returns the weakly-typed System.__ComObject , not the strongly-typed RCW class. I need to get the System.Type of the strongly-typed RCW class to be able to wrap the COM object with it using Marshal.CreateWrapperOfType() . Is this possible or is this a non-starter due to

I have many projects of which generate COM DLL's, these projects output the following: projectname_i.h projectname_i.c projectname_p.c projectname_i.tlb Then where another project consumes this DLL it is used like so: #import "projectname.tlb" named_guids no_namespace I want to change this to use include instead of import. The reason behind wanting to change from #import to #include is because I want to enable the /MP compiler switch to speed up build times. http://msdn.microsoft.com/en-us/library/bb385193.aspx So what I would like to know is: Why do COM DLLs have a TLB and a H? Which should

I've been looking hard for this but still have not found any solution. I'm using native win32 c++ (no MFC, ATL or .NET) I'm loading an html document with IHTMLDocument2->write(). I would like to get the event when the page is ready to show, meaning that all images and elements are downloaded and rendered. Following the embedded browser object from here embedded web control (IWebBrowser2), embedded javascript's onkeydown and onkeyup not firing and from here http://www.codeproject.com/Articles/3365/Embed-an-HTML-control-in-your-own-window-using-pla I managed to get an embedded web browser

I have a managed component written in C#, which is hosted by a legacy Win32 app as an ActiveX control. Inside my component, I need to be able to get what normally would be Application.Idle event, i.e. obtain a time slice of the idle processing time on the UI thread (it has to be the main UI thread). However in this hosted scenario, Application.Idle doesn't get fired, because there is no managed message loop (i.e., no Application.Run ). Sadly, the host also doesn't implement IMsoComponentManager , which might be suitable for what I need. And a lengthy nested message loop (with Application

When I try to connect to WMI from Powershell, ConfigMgr, or WMI explorer, I can talk to the majority of my computers, but some (maybe 30%?) return an 0x800706ba (RPC server is unavailable). If I turn the firewall off on the remote machine, the queries start working. I have tried a bunch of different configurations of firewall settings, though, and I can't seem to figure out what the right combination of exceptions is. Here's the relevant bits of my firewall config on the remote machine. The crazy part is that there are no drops listed in pfirewall.log when it doesn't work - but again, if I

I want to add a new method to a COM interface with all the existing one unchanged, will this break its compatibility for the consumer before this update? It depends: if this is an internal unpublished interface, you are free to change it at will so long as you control all the code that interacts with that interface. Once published, however, the rules are strict: every interface has its own IID. You change that interface in any way - by modifying, adding or removing methods - it's a whole new interface, and requires a new IID. However: COM does doesn't care how that new interface is implemented

Last Updated: 2009-08-11 2:30pm EDT A few days ago I posted this question about some very strange problems. Well, I figured out what specifically was causing a build on one machine to not run on others and even came up with a work-around, but now it leaves me with a nice, specific question: Why? To reproduce the problem, I create a new InteropUserControl and do the following: Add a new public struct MyStruct : Give it a GUID and ComVisible attributes Add a GetMyStruct member to the _InteropUserControl interface and implement it in InteropUserControl . MyStruct : [Guid("49E803EC-BED9-4a08-B42B

Is it just the way the bytes are combined to "encode" the data? I'm curious because I wonder how an RCW automatically takes a .NET string and transforms it into a COM BSTR. I'm guessing it just forms a valid COM BSTR transformed from the .NET string. Related: Could I construct my own valid BSTR using a byte type in .NET? The two string types are not related at all. A transformation has to occur to convert one type to another. A BSTR has a number of conventions that must be followed in including allocated via SysAllocString*, deallocated with SysFreeString, having a length prefix, and a