com

问题 In c++ we can easily set up method chaining in a class by designing methods returning *this. Would this be possible in an ATL/COM setting ? Let's say I have a simple ATL class MyOBj. I would like to know if chaining is possible in this context, and if so, what would be the idl signature of the method that would support chaining ? Simple examples would be appreciated ! (In fact, my methods are called from VBA for excel, and I would like to have chaining in that VBA context, as we have chaining

问题 I've added types to my .NET classes that I'm using for COM interop. To get it to work with my VB6 application, I unregistered the DLL and re-registered it (using regasm ). I then uninstalled and reinstalled it to the GAC (using gacutil ). The types are showing up in the VB6 object explorer, but when I run the application in the VB6 IDE, it breaks on the line that instantiates the new types with the error: Automation Errror - The System cannot find the file specified . I thought this odd since

问题 I am going crazy on this problem for the past couple of weeks. I have a C# Com object that needs to send property change notifications to a C++ Com object. An equivalent in VB would be using code that looks as follows PropertyChanged "propertyName". In C++ the equivalent to use the CFirePropNotifyEvent class from ATL. The C++ COM and VB COM objects do not implement a specialized events interface, so the equivalent are give above.. The C++ COM object that needs to sink the event is based

问题 I'm trying to implement a collections of objects via VC6 that can be accessed by a VB6 programs. I haven't been able to make it come together. I have defined _CopyVariantFromAdaptItf and _CopyItfFromAdaptItf (from "ATL internals"). Here are my defines to be used in my collections definitions: #define CComEnumVariantOnListOfItemInterface(ItemInterface) \ CComEnumOnSTL<IEnumVARIANT, &IID_IEnumVARIANT, VARIANT,_CopyVariantFromAdaptItf<ItemInterface>,vector< CAdapt< CComPtr<ItemInterface> > > >

问题 On my Windows Server 2008 R2 I installed a COM object and can create it from a classic ASP page. When I call it from a vbscript file, I get the "can't create" message. I have tried starting Powershell as administrator and using that to run the script. No luck. I have tried giving the "everyone" user full control over the COM DLL. No luck. Any ideas? 回答1: The only thing that makes sense to me is that the COM object is the same bit-ness as the class ASP and a different bit-ness than the script

问题 I have been adding new functionality to a COM Interface, and from what I have read the only way to do it( and keep it backwards compatible ) is to create a new interface that inherits the old interface and add the new methods. I have tried doing this but my hierarchy is already quite complex. Say this is how my interfaces currently are: IBaseInterface | IDerivedInterface and I want to add some functionality to the Base Interface, and it now looks like this: IBaseOldInterface | IBaseInterface

问题 Background I am working on a trading ActiveX API in visual studio 2010 on C#. Since it is an ActiveX API, I simply added the ActiveX as my reference. The api provides three group of things: Method you could use to call API, the Event with which the API updates information for you and some socalled ActiveX COM object. ISSUE I asked a related question here: C# boolean int conversion issue Finally, after viewing the exception has been thrown, I know that it is about casting. Here is the

问题 I have a computer running windows and connected with many devices, such as printer, RFID reader, etc. I want all my apps run as HTML, CSS, Javascript, so I need to access these devices through Javascript. But I don't know if it is possible to add custom Javascript API to browser (such as IE or Firefox), or what work are needed to make this possible. Thanks 回答1: You can use a browser's basic printing abilities to control a printer and may be able to find a keyboard wedge RFID reader, both of

问题 I am having a problem programmatically exporting Excel sheets that contain sparklines to PDF format. When I manually export the Excel sheet to PDF format using Excel 2010's native PDF Exporting facility then everything works fine, but the moment I do it using simple COM automation then everything is exported to PDF with the exception of cells containing sparklines. The weird thing is that when I add a few data bars to the excel sheet then the sparklines near the data bars are suddenly

问题 I am attempting to raise an event in .NET and have it picked up through COM by a VBA application. This answer has been quite helpful in getting my events to show up properly in the type library. On the VBA side, everything looks legit. I have an object variable declared "WithEvents" ,the IDE lets me add event handlers, and the compiler doesn't complain. However at run-time, when I use New to create the object I get the Run-time error 459: This component doesn't support this set of events.