COM

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COM and ISAPI Eytan Heidingsfeld27-Jul-00 1:39 Eytan Heidingsfeld 27-Jul-00 1:39  I'm using Delphi to create an ISAPI Extension. I I'm creating a COM object and the ISAPI freezes is there anything special that needs to be done? Re: COM and ISAPI ekarlsso6-Aug-00 3:04 ekarlsso 6-Aug-00 3:04  Hi, It's important to Initialize COM library for each ISAPI thread. You should initialize COM libray in GetExtensionVersion entry-function and uninitialize it in TerminateExtension enty-function. Erik CDialog in ATL COM DLL Server Rajendra R26-Jul-00 21:23 Rajendra R 26-Jul-00 21:23  Hi, I want to put a CDialog Derived Class in a ATL COM DLL Server without MFC Support(ie. MFC Support Unchecked).I am getting a crash in DoModal().When i debugged the code, AfxGetInstanceHandle was returning NULL and there was an assertion at this point.I verified whether the Resource Handle is loaded properly and it is! Cant i put a normal CDialog derived class in such a COM DLL? Should i go for an ATL Dialog? or should i have a COM DLL with MFC Support checked? Regards, Rajendra R Re: CDialog in ATL COM DLL Server czieler27-Jul-00 3:24 czieler 27-Jul-00 3:24  Well if you are going to use CDialog... you need MFC support... as CDialog is part of MFC. If you don't want to include MFC then use an ATL dialog. Register a DLL server Tony Li21-Jul-00 11:00 Tony Li 21-Jul-00 11:00  I built an ATL COM DLL server. When I tried to register it after its build, some error happened to the registration process. The error says, Performing registration RegSvr32: DllRegisterServer in MyServer.dll failed. Return code was: 0x80070716 I've looked up the error code. It says, "The specified resource name can not be found in the image file." Does anyone know what happened to the registration? Thanks, Tony Re: Register a DLL server Alex Gorev24-Jul-00 11:27 Alex Gorev 24-Jul-00 11:27  Hi, In the header file of your COM object you must have a DECLARE_REGISTRY_RESOURCEID(IDR_MYREG) macro. In the resources you must have a REGISTRY folder with IDR_MYREG defined inside. If you have a look at your *.rc file you will find out, that it just match the registry ID with your *.rgs file, which also must be a part of the project: IDR_MYREG REGISTRY DISCARDABLE "MyReg.rgs" Regards, Alex Gorev, Dundas Software. Re: Register a DLL server Tony Li25-Jul-00 4:17 Tony Li 25-Jul-00 4:17  Thanks! I'm just curious how you find the root of the problem. Tony How do I return an array of objects in C++ to my ASP page. notjeff19-Jul-00 20:08 notjeff 19-Jul-00 20:08  I know how to return an array of variants, such as if I wanted to return an array of integers. What I would like to do is along the lines of returning an array of C++ objects. Here is what I'd like to do: ASP Pseudo Code: <% 'First, get a connection to my catalog component. Set objCatalog = Server.CreateObject("my.Catalog.1") 'Now ask my catalog to find me all itmes that match 'the text I send and return them to me. Set objItems = objCatalog.Find("Books about ASP") 'For each item display its name, price, and then all 'of its pictures. For i = 0 to objItems.Count response.write objItems(i).name response.write objItems(i).price ' Now each book will have 0-20 picutres ' I'll need to have an array of strings ' with the URL to each picture SomeFunctionToGetAndOutHTMLtoShowPictures(objItems(i).pictures) Next %> So my question is how do I get my C++ component to return an array of catalog item "objects." This data is not coming from a database else, I'd just use ADO. My COM component goes out and grabs it dynamically and stores it in a linked list of Catalog objects. Now I just need to know how to get these darn things back to my ASP pages! I've searched high and low on Microsofts site and bought 3 books, but none of them cover anything like this. I'd appreciate any help, hints, scraps, anything at all to even point me in the right direction. I'm going bonkers trying to figure this out. Thanks NJ Re: How do I return an array of objects in C++ to my ASP page. Alex Gorev20-Jul-00 5:38 Alex Gorev 20-Jul-00 5:38  Hi, Returning an object to VBScript means returning an Interface of the object. It can be IDispatch or any other IDispatch derived interface. You can create and return a safearray of variants, where each variant holds an IDispatch to your object... but I think the best thing to do is to implement a collection of objects. Regards, Alex Gorev, Dundas Software. Re: How do I return an array of objects in C++ to my ASP page. notjeff25-Jul-00 22:11 notjeff 25-Jul-00 22:11  Thank you. We are a Dundas customer BTW. NotJeff IE 5.5: QueryInterface(IPersistStreamInit) fails on frames?!? Mike Morearty19-Jul-00 12:33 Mike Morearty 19-Jul-00 12:33  IE is documented as supporting IPersistStreamInit, so that given a document (an IHTMLDocument), you can get an IPersistStreamInit for it (by calling QueryInterface), and with that you can read the entire original HTML of the page. In IE 5.5, it works for the top-level frameset of a page; however, if, using the DOM, I navigate down to a lower-level frame's IHTMLDocument, QueryInterface(IPersistStreamInit) FAILS! It worked fine in IE 5.0. Suggestions? How can I get an IPersistStreamInit for the frames? Fireing events from a Thread... Daniel Fiske14-Jul-00 2:21 Daniel Fiske 14-Jul-00 2:21  I have a COM object that implements a connection point to fire events. I also have a worker thread that does some task. I pass the thread the pointer of the class that creates the thread, so that it can do calls back into the object. Some of the calls should fire events, but they don't. I'm not sure why....or how to get it to work...ANY ideas? D. Re: Fireing events from a Thread... Alex Gorev14-Jul-00 3:59 Alex Gorev 14-Jul-00 3:59  Hi, Events are signaled by calling the Invoke method of an IDispatch interface supplied by container. The interface lives in the apartment of its own thread, which is also the one containing the control itself. To comply with the STA model, we can only safely call this interface's methods from the thread in which it was created. If the control wants to signal an event from a different thread it must Marshal the IDispatch interface into the IStream first and then UnMarshal it. And of course it must call CoInitialize() too. To Marshal/UnMarshal interface pointers you can use my favorite functions: CoMarshalInterThreadInterfaceInStream(...) and CoGetInterfaceAndReleaseStream(...). Regards, Alex Gorev, Dundas Software. Handle of edit box in IE COM Ryan Park13-Jul-00 23:45 Ryan Park 13-Jul-00 23:45  Hi, I want to get the handle of edit box in IE COM.. The edit box that is dynamically created in IE by tags.. I am not sure that it is a window. Cause I failed to hook the handle of it in Spy++.. Is that a window? If it is, how can i get the handle of it? Any suggestion will be appreciated... Thanks in advance.. Regardz -Ray function to view error.log file BJ13-Jul-00 23:14 BJ 13-Jul-00 23:14  how can i call back the errors that i saved in the log file i need some function to call up the errors and view in textbox or something. can you help me. regards How to open error.log file John13-Jul-00 2:41 John 13-Jul-00 2:41  How can i open and view error.log file ?????? Reading an existing Excel File from C++/COM.. K M Bansal12-Jul-00 4:17 K M Bansal 12-Jul-00 4:17  How to read from an existing excel File from C++/COM. I am not able to use the existing article to alter it to reading from an existing excel File - reference Article;- MSDN Q192348 & Q216686. This uses automation. or how to use ADO to read the excel file. Any example if possible would be a greater help. Object to save text or number into file BJ12-Jul-00 2:06 BJ 12-Jul-00 2:06  How can i make an com object in vb6, that i can use to take text or number or text and number an save them to file in my hard drive????? Re: Object to save text or number into file Alex Gorev12-Jul-00 4:21 Alex Gorev 12-Jul-00 4:21  Hi, I don't get what exactly the problem is... Creating a COM object in VB6...? Passing parameters to the method...? Saving data into the file...? Or all of the above? Can you provide more information on the problem... Regards, Alex Gorev, Dundas Software. Re: Object to save text or number into file BJ12-Jul-00 5:44 BJ 12-Jul-00 5:44  i'l need to make an com object to handle errors in my softwear like if i get error then i like to do on error goto saveError and in my com Object i like to say if errornumber <1000 then save errornumber or text or text and number else resume next Name Space Extension rod7-Jul-00 8:14 rod 7-Jul-00 8:14  Im developing a Name Space Extension and I found some examples about draging and droping files into the explorer. I did like the examples said, but for I reason I don´t know, the drop works on other explorer different from the one I´m debugging, even droping on the Desktop works. But it doesnt work droping on the three in the same explorer I´m debugging. Does anyone have any idea why this happens? Calling a COM component from ASP pba_7-Jul-00 7:02 pba_ 7-Jul-00 7:02  Hi, Here is the question : I develop a COM component using ATL . In this component I have a method called "BeepMe", from where I want to return a BSTR message , as an out parameter : BeepMe ([out] BSTR* pbstrMessage) when I call it from an ASP page (written in Jscript): var strRet; Component.BeepMe(strRet); the strRet is empty . but, if I declare the pbstrMessage as retval ( BeeepMe([out,retval] BSTR* pbstrMessage) ) , and write : var strRet = Component.BeepMe(); everithing works fine . The pbstrMessage is propertly initialized in the method ( *pbstrMessage = ::SysAllocString(L"Beep") ), so that isn't the problem. I know that the VB script interpreter handle the deallocation of memory , and I suppose that is also the ASP case . That is the cause of this behavior ? ( the ASP interpreter free the memory of the returned value ? ) Re: Calling a COM component from ASP Alex Gorev7-Jul-00 8:42 Alex Gorev 7-Jul-00 8:42  Hi, First of all you should use the SysReAllocString instead of SysAllocString. It's not the source of the problem but it's a correct way of doing things. Before assigning a new value to the pointer you must free the data it's pointing to. STDMETHODIMP CTest::get_Path(BSTR *pVal) { if(pVal == NULL) return E_POINTER; if(!SysReAllocString(pVal, m_bstrPath)) return E_OUTOFMEMORY; return S_OK; } Your problem is that in VBScript and JScript cannot pass parameters by reference to automation properties or methods. Use return values of properties and methods to return a value instead of using byref parameters for this purpose. This approach limits you to one return value. Regards, Alex Gorev, Dundas Software. How to get IDispatch of an instance of Excel in C++ DLL called from Excel xla? leo6-Jul-00 2:11 leo 6-Jul-00 2:11  Hi I have created a c++ dll which works great in excel 2000, as I launch it as a com add-in, and get access to the IDispatch of the calling instance of excel via OnConnection (IDTExtensibility2). I would like to be able to launch the dll from excel 97, via an xla (or xll), which is not a problem, but I do not know how to get the IDispatch of the instance of excel that has the xla (or xll) running. (Excel.Application is no good, as it only finds the first instance of Excel.) If anyone knows the answer, please let me know Thanks! Re: How to get IDispatch of an instance of Excel in C++ DLL called from Excel xla? leo10-Jul-00 4:37 leo 10-Jul-00 4:37  Hi I have worked out how to do it from an xla , but if anyone knows how to do the same in an xll please let me know. From Auto_Open() sub of xla, pass Application to function in DLL i.e. in XLA !declaration of function in DLL Private Declare Function InitExcel97 Lib "MyDLL.dll" (ByVal app As Object) As Long Public Sub Auto_Open() Result = InitExcel97(Application) … End Sub in DLL extern "C" __declspec( dllexport ) LONG WINAPI InitExcel97(LPDISPATCH Application) { long result; g_pApplication = Application; //global declaration IDispatch* g_pApplication; theApp.InitializeExcel(); //calls same code as if launched by com addin in Excel2000 …. return result; }

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