idispatch

问题 I'm trying to sink DShellFolderViewEvents using the ATL, and the only method I've been able to successfully subscribe to is DISPID_SELECTIONCHANGED . There appear to be many other events listed in the header shdispid.h , but I can't get them to fire. Not sure what I'm doing wrong (it might be ATL-related), but I thought perhaps I'm implementing event-handler functions with the wrong signatures (currently I'm just trying void functions with no arguments). The problem is that there doesn't

问题 I tried looking around but was not able to convince myself with an answer as the world of COM/ActiveX seems to be very confusing. Basically what I want to know is, given the GUID, is there a way to know all the interfaces, properties and methods exposed by an ActiveX control? I read somewhere that you just have to ask if a particular property is there or not. But how do I ask about a property before knowing what are there? I guess IDispatch does something similar, but I am not able to make

问题 following a similar question i answered some time ago, i found out that when trying to enumerate the object, using IDispatch::Invoke(DISPID_NEWENUM,...) fails with DISP_E_EXCEPTION on IE9. This happens with IDispatch and IDispatchEx , on any javascript array. needless to say that the code works great on IE6-IE8, and fails only on IE9. The same question also appears in the MSDN dev forums with no luck so far. Here's a code snippet to demonstrate what I tried to do. notice that pDispatch is the

问题 I have a Delphi XE2 application with a TEmbeddedWB that I use to simulate user actions. The application navigates to a URL, populates the relevant form fields with data and submits the data. The problem is that there is an <input type=file /> field which accepts files that are uploaded. Having done a lot of reading on the matter I understand there is a security issue doing this programmatically but also found someone making a suggestion that the files could be ‘dragged’ from the clipboard and

问题 In my last development environment, I was able to easily interact with COM, calling methods on COM objects. Here is the original code, translated into C# style code (to mask the original language): public static void SpawnIEWithSource(String szSourceHTML) { OleVariant ie; //IWebBrowser2 OleVariant ie = new InternetExplorer(); ie.Navigate2("about:blank"); OleVariant webDocument = ie.Document; webDocument.Write(szSourceHTML); webDocument.close; ie.Visible = True; } Now begins the tedious,

问题 I have a C++ DLL that needs to call a function (pass a value, return a value) in a C# class library. Is my only option to give the C# DLL a COM interface and call it from C++ with IDispatch? Is this the best method? 回答1: Couple of options available for you here Use a mixed mode C++/CLI assembly as a bridge between the C++ and C# DLL Use the a COM bridge by exposing several of the key C# types as COM objects. This can then be accessed via the C++ code by normal COM semantics 回答2: This project

问题 I have a C++ DLL that needs to call a function (pass a value, return a value) in a C# class library. Is my only option to give the C# DLL a COM interface and call it from C++ with IDispatch? Is this the best method? 回答1: Couple of options available for you here Use a mixed mode C++/CLI assembly as a bridge between the C++ and C# DLL Use the a COM bridge by exposing several of the key C# types as COM objects. This can then be accessed via the C++ code by normal COM semantics 回答2: This project

问题 I need to compile some code of mine using the gcc compiler included in the R tools (R the statistical program for windows), the problem is that I need to use IDispatch in my code to create an access the methods of a COM object, and the gcc compiler doesn't support much of the code that I'm using to do so, which is basically C++ code. So my question is how can I use IDispatch in C to create the COM object without having to depend on MFC, .NET, C#, WTL, or ATL. I believe that if I do so I will

问题 I need to compile some code of mine using the gcc compiler included in the R tools (R the statistical program for windows), the problem is that I need to use IDispatch in my code to create an access the methods of a COM object, and the gcc compiler doesn't support much of the code that I'm using to do so, which is basically C++ code. So my question is how can I use IDispatch in C to create the COM object without having to depend on MFC, .NET, C#, WTL, or ATL. I believe that if I do so I will

问题 I'd like to build a COM visible C# class, say DynamicComponent , that would provide a dynamic interface through COM. Internally this class would maintain a dictionary of delegates: "GetTheAnswer" -> () => { return 42; } "Add" -> (int a, int b) => { return a + b; } ... The client code would be some VBA. Here is the workflow I naively imagine: from the Excel/VBA editor the user references the TLB the user instantiates a new DynamicComponent (well at least get a stub provided by Excel/VBA) Excel