COM

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STL: How can I delete a <list>... Braulio Dez4-Apr-01 5:27 Braulio Dez 4-Apr-01 5:27  Hi !, I´m new using this STL, now I can add members to a list an iterate though that list, but ... still don´t now how to delete members from it, and free the list in a right way... Can anybody help me ? Thanks a lot,Bye ! Braulio Help with Unusal Debug Error. Joseph Dempsey2-Apr-01 4:36 Joseph Dempsey 2-Apr-01 4:36  I need some help. I am experiencing an error while attempting to use a function I have imported from a COM inproc DLL. After I import the library I start using it. There is one function that gives me a debug error. It comes out of the i386\chkesp.c file. It says that a ChkESP error has occurred and that it usually happens with an issue with using a function pointer that using a different calling convention that a defined function (I checked and this isn't it. My calling conventions are fine __stdcall). After tracing through the code I find out that it occurs after the COM function completes but before the next line of code exectued in the .tlh file's wrapper functions. Note that if I just click ignore the error everything still works fine. In my app I am using the library in the code looks something like: ITCPServerPtr tcp = ITCPServerPtr( CLSID_CoTCPPort ); tcp->OpenPort(); //works bool check = tcp->SetBuffers(newSize); //works bool check2 = tcp->StartupServer(port); ... the error happens after the actual COM StartupServer func. executes but before a return happens. Has anyone ever seen anything like this before. If so anyone know how to fix it? I am in the dark. FYI: When I build release ver. all works and no error pops up. Joseph Dempsey jdempsey@cox.rr.com Joseph.Dempsey@thermobio.com "Software Engineering is a race between the programmers, trying to make bigger and better fool-proof software, and the universe trying to make bigger fools. So far the Universe in winning." --anonymous Re: Help with Unusal Debug Error. Chris Losinger2-Apr-01 5:34 Chris Losinger 2-Apr-01 5:34  i get this when the IDL and the DLL disagree on something. usually a rebuild-all fixes it for me. -c ------------------------------ Smaller Animals Software, Inc. http://www.smalleranimals.com Re: Help with Unusal Debug Error. Joseph Dempsey2-Apr-01 5:39 Joseph Dempsey 2-Apr-01 5:39  tried that already.. Doesn't do any good. Thanks though. Joseph Dempsey jdempsey@cox.rr.com Joseph.Dempsey@thermobio.com "Software Engineering is a race between the programmers, trying to make bigger and better fool-proof software, and the universe trying to make bigger fools. So far the Universe in winning." --anonymous ActiveX Controls and Downloading 31-Mar-01 11:49 31-Mar-01 11:49  I was wondering if there is a way to find out when an ActiveX control has actually downloaded. I need to pass a few parameters from my HTML page to my ActiveX, but I am having timing and synchronizing problems. The problems arise from the fact that a lot of times the method calls are made before the object has fully downloaded. Is there any method or events that I could use to find out whether an ActiveX has downloaded? thanks Message Map in ATL Server 28-Mar-01 5:04 28-Mar-01 5:04  I'm writing a ATL DLL Server. Inside the server, I want to define some custom message to handle some scenario. But I dont't know to create a message map to handle this custom message. Anyone knows about it? Thanks, Tony How to add New ATL-object to MFC Application? 27-Mar-01 18:21 27-Mar-01 18:21  I tried to add a new ATL-object to MFC Application (Microsoft Visual Studio 6.0). It is a usual process for ATL-Wizard. But I get exe-file only without proxy/stup dll and without automatic registration. Does anybody have experience how to make it? Thanks in advance ATL-buildman Re: How to add New ATL-object to MFC Application? pba_11-Apr-01 1:04 pba_ 11-Apr-01 1:04  It depends of your interface definition file. If you use custom marshalling , the midl compiler will generate three files , which must be compiled in a dll. ( exp : from test.idl will generate test_i.c , test_p.c, and dlldata.c ). If the interface marshaller will be used only under WinNT.3.51 or w95, you should define in the dlldata.c the REGISTER_PROXY_DLL symbol. The generated .dll fully support automatic registration. If you don't want to use custom marshalling, you can use the universal marshaler, by adding oleautomation attribute to your interface ( if your interface use only data types supported by variants). How to add New ATL-object to MFC Application? 27-Mar-01 18:15 27-Mar-01 18:15  I tried to add a new ATL-object to MFC Application (Microsoft Visual Studio 6.0). It is a usual process for ATL-Wizard. But I get exe-file only without proxy/stup dll and without automatic registration. Does anybody have experience how to make it? Thanks in advance ATL-buildman Please help me! I'm lost! (Again!) 26-Mar-01 10:17 26-Mar-01 10:17  Ok, I've got an ATL appwizard with MFC support. Implemented a ActiveX server object (I'm trying to write an ASP extension to interface to some code i've already got working elsewhere). To test the theories of ATL and COM, I'm trying to make a simple propert that returns the IP address of the client (from Request.ServerVariables("REMOTE_ADDR") ). Here's the function I'm trying to use: STDMETHODIMP CMyClass::get_GetIP(BSTR *pVal) { AFX_MANAGE_STATE(AfxGetStaticModuleState()) IRequestDictionary *piRequestDic; m_piRequest->get_ServerVariables(&piRequestDic); VARIANT v_Param, v_Value; _variant_t vt_Param; vt_Param.Attach(v_Param); vt_Param.Clear(); vt_Param.ChangeType(VT_BSTR,NULL); vt_Param.SetString("REMOTE_ADDR"); piRequestDic->get_Item(v_Param,&v_Value); VariantChangeType(&v_Value,&v_Value,0,VT_BSTR); *pVal=v_Value.bstrVal; return S_OK; } When I call a simple asp page that creates this object and attempts to read this GetIP property, IIS hangs. I have to use Winnt reskit's KILL.EXE to close it. I have no idea whats wrong- i've followed my logic through several times and i'm oblivious to the prob. help appreaciated thanks jon h Acces Violation with oledb CoUninitialize() instruction 25-Mar-01 23:14 25-Mar-01 23:14  Hi, I use Visual C++ 6.0 SP 4 , SQL Server and oledb I create a class to connect to my database. In my constructor i initialize com library like this : CoInitialize(NULL); In my destructor i release com library like this : CoUninitialize(); If i use this class to execute for exemple an sql query ( store procedure), my functions open, execute, close,... work. But if i close my application ( OnOK ) , two seconds later i obtain the following acces violation message : EXCEPTION(c0000005 acces,@40f919) EBP184f0b8 EIP40f919) ASM 45 fc 8b 08 8b 01 52 ff 50 08 8b e5 5d c3 cc cc cc cc cc cc EAX:184f618 EBX:dc0110 ECX:383439 EDX:383439 ESI:dc0064 EDI:184f664 ESP:184f0b4 The suspect function is _Release() throw() which is in a Visual C++ include file ( in Include\COMIP.H ) // Releases only if the interface is not null. // The interface is not set to NULL. void _Release() throw() { if (m_pInterface != NULL) { m_pInterface->Release(); } } But if i comment out CoUninitialize() instruction, my code work without acces violation. Can anybody help me? Best regards, Cheickna VB ActiveX DLL with VC question Amit Dey25-Mar-01 9:51 Amit Dey 25-Mar-01 9:51  Hi, I build a VB activeX dll and viewed the IDL file with OLE/COM viewer. apparently, everytime I rebuild the DLL the interface IID (GUIDs) change and I have to re-extract IDL and use in VC client. Is this natural/normal for VB to generate new GUID's for interfaces when rebuilt. TIA. DCOM Service problem yamini22-Mar-01 23:25 yamini 22-Mar-01 23:25  Hi All, I am able to run DCOM successfully between any number of systems if the server is an EXE OR DLL(Not service).But, I am getting problem when I have DCOM server as a service !(It works perfectly when I have both server and client running in my system )! What could be the problem with DCOM Configuration . Thanks in advance for the help ! Y.Yamini Devi Re: DCOM Service problem 2-Apr-01 2:01 2-Apr-01 2:01  it's security problem How do I add a menu/toolbar to my atl activex control? Timothy A. Anderson19-Mar-01 13:34 Timothy A. Anderson 19-Mar-01 13:34  I'd like to add a toolbar to my control. I imagine the easiest way to do this is to use some type of quasi-framework to encapsulate the different types of functionality, but I'm having a hard time thinking about how I would accomplish this task. Given a standard ATL COM object, where do I start looking to create a quasi-framework to enable toolbars? #include "witty signature.h" Customizing Intellisense Information Tooltips 19-Mar-01 12:20 19-Mar-01 12:20  Question Summary: How do you customize the "tooltips" displayed by Intellisense? Question Details: I am trying to customize the "tooltips" that show up as a part of Microsoft's Intellisense "Auto Complete" feature. For example, while building an ASP page in Visual InterDev, if I type "Request" and a dot (.), an Intellisense window "pops" up and displays the properties and methods that the ASP Request object supports. As I scroll down the list of available methods and properties, an "information" tooltip appears to the right of the drop down list. I have been able to trace the content of these "information" tooltips back to the type library ASP.tlb. The same "information" string appears in the helpstring attribute. It would seem that this is the source of the text that Intellisense uses. (If this observation is incorrect, please let me know) When I created a test component, I put my own detailed help "information" string in the helpstring attribute. However, when I do this it does not show up like it does for Microsoft's intrinsic ASP objects. In fact, it does not show up at all. What am I doing wrong? Why is Microsoft able to do this and I am not? Is there a different IDL attribute to set, or perhaps a different IDL compiler is required? Thanks in advance for any advice or recommendations. If anyone knows of good documentation of Microsoft's Intellisense, that would be great too. Sincerely, Trong Ha Integrating two applicaiton 17-Mar-01 2:38 17-Mar-01 2:38  I have 2 applications one is a explorer view(Application A) and the other application view is derived from list view(Application B).Both are based on Doc-view architecture. I need to make a COM dll of Application B and the view of Application B will integrated in the list view of the Application A with Splitter window. How do i handle the MFC derived classes between the two application to create this splitter view ? Anonymous Passing MFC derived Objects back from COM to Application 16-Mar-01 4:58 16-Mar-01 4:58  Just a "quick" question on interfacing COM objects which use derived Objects based on MFC. My understanding of COM is that if you want to stick with the rules, you usually use IDL to define your interface, and you don't pass back Objects based on any particular Library such as MFC or STL etc... This would require alot of re-writing of my current code, so I was wondering if there is any way to keep a list of Objects derived from MFC classes in the COM DLL and all the Object method definitions and code etc. What I want to be able to do is Create the COM object and get the required Interface to give me a pointer to the list of objects in the COM dll. This will require me to include the definitions of the Classes etc in my application as well, but the problem I am facing it the Method Implementation Code. Currently this is in the COM DLL, but I can't build my Application without linking the COM DLL as a standard DLL (by linking with the COM's .LIB file). Although I can still use the COM interfaces this way, it means I have to tie the COM object to closely to my application (and defeats the purpose of using COM in the first place) Is there any way I can instantiate the COM object as normal and pass back a list of MFC derived Objects (with my OWN Classes based on MFC ones) to my application, and then call the member functions of these Objects without linking to the COM's .LIB file? The only way I've managed to do this, is by linking to the .LIB file, or by having to include the .CPP files for the classes in my application code as well as my COM DLL code, which I don't want to do! Many thanks! TLB problem !!! 14-Mar-01 0:50 14-Mar-01 0:50  My .tlb file generated by MIDL converts the interface function parameters of type BOOL to long. So, when I'm trying to call that methode I've got a compiler error. What's a problem ? Re: TLB problem !!! Joseph Dempsey27-Mar-01 3:50 Joseph Dempsey 27-Mar-01 3:50  your problem is that MIDL doesn't support the BOOL data type. In your .idl or .odl file (depending on what you're using) change the BOOL to boolean and then in the actual class implementation change it from BOOL to unsigned char. Try to find a table somewhere of data type mapping from MIDL to C++. O'Reilly's DCOM book has good examples of this. Hope this helps. Joseph Dempsey jdempsey@cox.rr.com Joseph.Dempsey@thermobio.com "Software Engineering is a race between the programmers, trying to make bigger and better fool-proof software, and the universe trying to make bigger fools. So far the Universe in winning." --anonymous COM with CGI's Steven Gregg12-Mar-01 23:37 Steven Gregg 12-Mar-01 23:37  I have a CGI executable (and also an ISAPI version) written in C++ which uses COM to retrieve data from another process (a voicemail server executable file running on the same machine). When I use a web server such as Xitami, it triggers the CGI and retrieves the data from the other process but when I use Microsofts IIS the CGI appears unable to use COM. I'm wondering if it's something to do with IIS preventing the CGI from accessing the system registry or GUID information? Any ideas???? Steevie BSTR or Structure ? 11-Mar-01 16:32 11-Mar-01 16:32  I have to pass a lot of parameters to and from my COM in one function. What would the better to use a BSTR string or to pack them into a structure? If a structure, could anyone sent an example how to use a pointer to the structure in IDL design. Thanks. Re: BSTR or Structure ? 13-Mar-01 7:25 13-Mar-01 7:25  Hi, You have an option of passing all the parameters as SafeArray of bytes or you can use the wrapper COM object for the parameters. The second approach is much easier to use but it cost time to create/destroy extra object. As for me if I don't call the function too often I prefer to use a special object for passing parameters. There is an article in MSDN "OLE Q&A" by Don BOX which has more details on the topic... Regards, Alex Gorev, Dundas Software. Datasource - how to make? 11-Mar-01 4:37 11-Mar-01 4:37  Can anyone point me to manual, where i can read about developing datasource? I mean i need to implement my own datasource... where to read about? control dynamic proeprties. 8-Mar-01 4:13 8-Mar-01 4:13  Can i set a control properties dynamically? If so how can/should I?

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