COM

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Re: How do i extract a substring from a variant or bstr Alex Gorev4-Jul-00 4:14 Alex Gorev 4-Jul-00 4:14  Hi, Variants store the strings as BSTRs. You can work with BSTR strings using the standard string functions if you convert it using the OLE2A(...) macro. USES_CONVERSION; char *p = strstr(OLE2A(m_bstrData), "Data="); If you have a lot of string operations I recommend you to use the WTL's CString class. It's a light weight template, which duplicate the functionality of the popular MFC's string class. Regards, Alex Gorev, Dundas Software. ATL PROP_DATA_ENTRY Lakshmi Vyas30-Jun-00 6:08 Lakshmi Vyas 30-Jun-00 6:08  How to add a custom color property entry in PROP_DATA_ENTRY macro - what should be the vt value? Re: ATL PROP_DATA_ENTRY Alex Gorev30-Jun-00 11:33 Alex Gorev 30-Jun-00 11:33  Hi, If it possible use the wizards to add the property and specify the OLE_COLOR as a data type. When a property is declared as OLE_COLOR, the Properties window will display a color-picker dialog that allows the user to select the color for the property visually, rather than having to remember the numeric equivalent. Internally it's treated as a Long. Regards, Alex Gorev Dundas Software. Re: ATL PROP_DATA_ENTRY Lakshmi Vyas30-Jun-00 16:54 Lakshmi Vyas 30-Jun-00 16:54  Hi, Thanks for replying. The reason why I need the PROP_DATA_ENTRY is to persist the property. I have added properties using the wizard already. When I add an entry like... PROP_DATA_ENTRY("Start Color", m_clrStartColor,VT_UI4) the VB client gives invalid property when being persisted. Please clarify. Thanks & regards, V.Lakshmi Narasimhan Re: ATL PROP_DATA_ENTRY Alex Gorev4-Jul-00 3:54 Alex Gorev 4-Jul-00 3:54  Hi, First of all if you have a Set/Get functions for the property and it's part of any property page it's better to use PROP_ENTRY macro. Even if you don't use the property page you can always set it to CLSID_NULL. BEGIN_PROP_MAP(...) PROP_ENTRY("StartColor", DISPID_START_COLOR, CLSID_NULL) END_PROP_MAP() The other thing I've noticed is that you use a space in the name of the property. Never use it in the name of the properties, it can cause all kind of problems. Regards, Alex Gorev, Dundas Software. ASP Components Kitkat29-Jun-00 19:16 Kitkat 29-Jun-00 19:16  Hi... While developing ASP Components in VC, is there any restriction to use MFC in it? Should we use MFC or not? If answer is "Yes" then explain it and if answer is "No" then explain it also Thanks! Re: ASP Components Alex Gorev30-Jun-00 4:04 Alex Gorev 30-Jun-00 4:04  Hi, There are no any restrictions... but ASP components do not have any GUI, so there is no any reason to use MFC. If you need a good string class use WTL instead. So my answer is NO. Because you don't need MFC and it will affect the size and performance of the component comparing to ATL & WTL. Regards, Alex Gorev, Dundas Software. com to save error Bjarni27-Jun-00 0:31 Bjarni 27-Jun-00 0:31  HI HI HI Need to now how to make com object to save an error to file so the client can't see any msgBox but i can view the errors from the file any time i want. Re: com to save error Alex Gorev27-Jun-00 4:11 Alex Gorev 27-Jun-00 4:11  Hi, I don't think it's possible to do... If the component shows the dialog on error there is no way ho hide this dialog and to get the error text, except if there are special methods/properties for that. Only if the standard IErrorInfo interface is used than you can change the component container behavior. Regards, Alex Gorev, Dundas Software. Re: com to save error Bjarni27-Jun-00 23:46 Bjarni 27-Jun-00 23:46  Hi again How about just make a com object to save the errors that comes up to file?? regard Bjarni Re: com to save error Alex Gorev28-Jun-00 4:16 Alex Gorev 28-Jun-00 4:16  Hi, Is it a third party COM object, or you designed it by yourself? If you don't have the source code just the DLL file I don't see any ways to MAKE the COM object to write the error messages in the file. Regards, Alex Gorev, Dundas Software. What's Component Manager Member 327926-Jun-00 20:34 Member 3279 26-Jun-00 20:34  And how Visual Basic ActiveX DLLs get the reference to Component Manager which implemented by client in order to display modeless forms in the ActiveX DLL. Thanks for any suggestion? Re: What's Component Manager Steeves Saillant9-Jul-00 12:37 Steeves Saillant 9-Jul-00 12:37  I beleive its Components Services in Win2000 in 98 or NT4 its where you make your packages ,you should definitly get the Platform SDK CD or download it from microsoft it'll give ya your answer,cause quite frankly I am not sure that I understand your question we'll at least I tried Steeves ,C++ programmer Apartments and multi threaded programming Rajendra Acharya26-Jun-00 4:03 Rajendra Acharya 26-Jun-00 4:03  Hello, I want to create an Apartment threaded compoent server which will be used by the main thread client.How do i go about doing this?Any tips will be of help!1 Best Regards, R Acharya Re: Apartments and multi threaded programming Alex Gorev26-Jun-00 4:43 Alex Gorev 26-Jun-00 4:43  Hi, I don't understand what problems do you have... To create an Apartment threaded component just select the Attributes page of the ATL Object Wizard Properties and make sure that Threading Model is set to Apartment. It's a default value, so usually you don't have to change anything. Regards, Alex Gorev, Dundas Software. How does a Client know if there is a COM server that belongs to it KNEI26-Jun-00 2:05 KNEI 26-Jun-00 2:05  HI I was wondering how a Client can see if a COM server that belongs to him exists in the registry. If an server exists I would like to add an item in the Client's menu. Thank you for your time. Re: How does a Client know if there is a COM server that belongs to it Keith Hill6-Jul-00 18:35 Keith Hill 6-Jul-00 18:35  First you need to know either the CLSID or the ProgID of the server. If you know the CLSID then convert the CLSID to a string using StringFromCLSID. Then attempt to open the following registry key: HKEY_CLASSES_ROOT\CLSID\"Your server's CLSID as a string" If the key exists then the server has been installed on this machine. If you have the ProgID, you can use CLSIDFromProgID() to get the CLSID and then proceed as indicated above. The other option, is to use CoCreateInstance() to see if you can actually create the object and then shut it down. However, that might affect performance of your app unacceptably. Re: How does a Client know if there is a COM server that belongs to it Brian Hart9-Aug-00 18:34 Brian Hart 9-Aug-00 18:34  Call CoGetClassObject() and test to see if it fails with the REGDB_E_CLASSNOTREG error: IClassFactory* pCF = NULL; HRESULT hResult = CoGetClassObject(CLSID_TheObject, NULL, CLSCTX_WHATEVER_YOU_WANT_TO_USE, (void**)&pCF); if (FAILED(hResult)) { if (hResult == REGDB_E_CLASSNOTREG) { // the server's not registered properly... } } child windows & controls from an add-in Aynonymous22-Jun-00 11:38 Aynonymous 22-Jun-00 11:38  Hi, I'm writing an add-in in Visual C++. I'd like to attach my own docking dialog bar and child window to Visual C++ so it will look like an intergral part of it. I haven't been able to do that, and even though MSDN says that you can create modeless dialogs (because they don't have their own message pump), I HAVE seen an add-in called RadVC which similated a Visual Basic environment in Visual C++ - which indicates that it IS possible to do what I want. How can I do it then? Is there a specific COM interface for doing that? Thanks. Shell Extensions John22-Jun-00 6:07 John 22-Jun-00 6:07  Hi I've implemented some code that adds an item to the context menu , but I need to add two subitems for that item. Can you please help me ? Thanks Re: Shell Extensions Mike Dunn22-Jun-00 8:00 Mike Dunn 22-Jun-00 8:00  Check out Part 2 of my series on shell extentions.

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