Synchronization of multiple MFC processes?

I'm having difficulty devising a correct synchronization scheme for the following. There are four processes, each a dialog-based MFC app, written in C++, built with VS2005. Call these processes Master, A, B and C. The synchronization issues are these: 1) When any of the 4 processes is started, it must detect whether another instance is already running. Normally this is done using a global mutex, but that solution will not work unless the O/S guarantees to run the app long enough to create the mutex. The critical case is when two instances are started almost at the same time.

Exception Logistics

Would appreciate input on the following: Prelude, (keep in mine I understand that for MFC I need to use or at least wrap all exception handling in a MFC derivation, and use new (not Referenced& or copies). However in an effort to learn such a diverse subject as exceptions I have need of input on the following) " If " I have understood all that I have read on exceptions, then with Visual C++5 on, compiling with /GX or /EHs, and enables the compiler's synchronous exception model for C++ exception handling (/GX for mfc apps). And that this would not (if you did not compile with no

read contents of msg file from IStorage

I'm getting a msg file as result from a DragDrop operation as IStorage object. I would like to extract the msg file itself as binary as well as all attachments, the subject of the mail, the recipients ... Now, when "parsing" the IStorage object, I get roughly 40 IStream objects. How can I find out, what these stream objects are for? Do I have to open each stream and to interpret the content or is there a naming convention? Most important would be to get the msg file as binary. Thanks and regards, Thomas

How to suppress Microsoft ODBC for Oracle error message

Hello. There is an error message displayed when Oracle Client isn't present: "Oracle(tm) client and networking components were not found. These components are supplied by Oracle Corporation and are part of the Oracle Version 7.3 (or greater) client software installation. You will be unable to use this driver until these components have been installed." Is there any way to suppress this message because I want to handle this situation on my own. An exception is caught so only reported error is redundant. Thanks for any help.

OnSetActive not called

Hello NG, I have an MDI app. The view has a property page. There I have OnSetActive that calls a function "FillEditCtrl" to showsvalues in an edit control. I call a menu that opens a dialog. The user can edit values that are shown in the edit control of the property page of the view. The user closes the dialog. But OnSetActive of my property page is not called, so the values are not shown in my view. After closing the dialog, what afx msg is called instead? void CMainFrame::OnMenuEditValues() { CWnd* pw = GetActiveWindow(); CTheDialog dlg; dlg.DoModal(); pw-

About Edit and Continue

Sometimes "Edit and Continue" facility in VS 2003 Studio denies to work. I want to know in which cases this happens??

OPC server & MFC

Is there and can anyone point me to some references addressing an OPC server with the handy ODBC classes of MFC? Or am I wishing for too much? Ron H. -- This eMail has been scanned by Norton� 360 and found to be virus free!

MFC/C++ report writing?

Does anyone here use MFC/C++/GDI+ to write in-house business reports? or most people should use crystal report instead? I am trying to develop a framework for general work in businesses which constitutes of report writing, use of grid, unicode and multi-threading etc. Thanks Jack

ON_UPDATE_COMMAND_UI overridden????

I want to change the text on a menu on the fly. So I do this with pCmdUI->SetText() in its ON_UPDATE_COMMAND_UI handler. It works fine except.... ....when the text ends in \tCtrl+X to add my (home grown) shortcut, (or \tAnything) this bit is subsequently removed (as the command has no entry in the ACCELERATORS table). With the old CMDIFrameWnd, CToolBar, CMenu etc stuff it all worked the way it said on the tin. But with the new CMDIFrameWndEx, CMFCToolBar, CMFCMenuBar stuff, it's deciding it knows better than I do what the text should be. This is infuriating. W

PlaySound Question

Hi, I want to play a wave file when I click on a button #include <MMSystem.h> .... int CDialog::OnBtnClick(...) { PlaySound("123.wav", NULL, SND_FILENAME); } But PlaySound and SND_FILENAME identifiers are not found. Any ideas? Thanks Jack

Off for a while

I leave Sunday for San Jose, and will not return until after this NG is "officially" closed. So I don't know what is going to happen. I tried to install Hector's NNTP Bridge but it keeps telling me a DLL is missing, and I gave up. So it may be a while before I reappear. I will still be active until late Saturday night. joe Joseph M. Newcomer [MVP] email: newcomer@flounder.com Web: http://www.flounder.com MVP Tips: http://www.flounder.com/mvp_tips.htm

How to subclass an MFC window?

Is there any easy way of overriding the responses to some messages to a CWnd-derived object buried deep within MFC? One reason for the question is: In the old days CMainFrame was derived from CMDIFrameWnd and this had a member HWND m_hWndMDIClient; To draw the background of this window I used to do a SubclassWindow( ) on it, and with my own CWnd-derived object, respond to WM_ERASEBKGND messages. Nowadays CMainFrame is derived from CMDIFrameWndEx and this has a member CMDIClientAreaWnd m_wndClientArea; and (I think) because a CWnd object already exists for the M

localhost

Sometimes I run a client and server application on the same server and I connect them using "localhost" as the IP. The server program then reports the IP address of the client as "127.0.0.1". Is that the IP it ALWAYS translates to? In one display of my server program I show the IP of the connected host. The customer is confused when it shows "127.0.0.1". In my code, can I check for that IP and then display "localhost" instead? Would that always work?

Where to store an applications settings file in Windows 7 / Vista

My application uses a xml settings file which can be changed from within the application by the user. Now, under Windows 7 and Vista, I don't know where to store this file. It is not possible to store it under Program Files\... due to missing write access of non-administrators What is the right place to store such files? Thanks, Thomas

IID_IHTMLElement Usage in VC++

Dear Friend, Can any one please send some sample code stuff which shows the usage of IID_IHTMLElement for eliminating "id " Input attribute of a webpage resource. Thanks

Exception Semantics question

I have a question on try throw semantics. This has nothing to do with whether I should try or catch but just the fact that I don't understand what is going on here. Admittedly this is not any real code but a scenario that I happened on by accident in experimenting with writing my own exception class. The below code compiles and runs with no errors but a newb like me doesn't understand how. See comment on GlobalFunc #include <iostream.h> class ClassNoObject { public: ClassNoObject(){} ~ClassNoObject(){} void ClsNoObjFunc() { cout << "no object class printing? \n

Stay resident dll

I currently have a MATLAB mex function that allows the user to view & manipulate 3D point cloud data directly from MATLAB. A mex function is nothing more than a standard dll with a specific MATLAB entry point. The viewer was written in MFC using OpenGL. My problem is that since it is a dll the user must close the viewer before returning to MATLAB. In other words, the user calls the viewer from MATLAB, looks at the data, closes the viewer and then returns to MATLAB. I would like to find a way to keep the viewer up permanently so that it works independently from MATLAB so th

Calling a web service from MFC

Hi fellows, How do I call a web service from an MFC application? This is something I'd like to do without bringing .NET into the picture, if possible. Thanks in advanced for any pointers.

Looking for recommended approach to using Regular Expressions.

Hello again folks, I am working through things in my application, and I would appreciate any recommended approaches to using Regular Expressions in my code. This is an MFC application. I am using Visual Studio 2008 pro. I have read about references to a "boost" library, and I have read references to an ATL regex class, and I have read something about Regular Expressions being included in SP1 of VS2008. I wnat to use regular expressions to edit telephone numbers, and Postal Codes, and dollar amount fields. Anyway, if anyone has any experience with any of the above, and can offer

Problem handling keyboard events in ActiveX on IE8

Hi All, I have a ActiveX control which was working fine till now. I was using IE7 as the ActiveX container. I handle the keyboard events using PreTranslateMessage. But since i switched to IE8 the keyboard events are not being passed to my activex control. If i press backspace in a edit control on my ActiveX, the browser gets re-directed to the previous page. Also i'm not able to debug the ActiveX control since i switched to IE8. Why am i not able to debug my application? Any help is highly appreciated. Thanks, Bharath

ALT+TAb problem in W7

Hi, I have an MFC application which its main window does not pop to foreground when the user presses ALT+TAB on W7. Can someone help me understand what may cause it ? thanks, Yoav.

Deriving from a class derived from a CDialog

Hello, Hopefully the title wasn't too confusing. I have a problem with the class wizard. For classes which are derived from CDialog via 2 hops he looses the ability to generate event handlers. If I add the event handlers by hand things work but the automatic 'wizard' things in the resource editor no longer work. 1) What I wanted to achive and did The project (a dialog based app) uses a tabulator control to display various pages to the user where he can change values, send commands to an external device and see the results. But certain operations have to be performed always when

How to show underlined menu shortcut letters by default for a context menu ?

Hello I try to present the user with a pop-up menu using TrackPopupMenu, and although I use menu items with text like _T("&Set UIO Area"), with an ampersand in front of S to get the letter underlined in the menu so user knows she can press 'S' key on the keyboard to chose the command from the menu. However the letters never get underlined and I hear this is a Windows 2000 "feature" (is that how they call bugs today ?) and that I have to changes some system settings in display control panel to get the meniu right. The problem is my client wants the shortcuts on the menu,

panel method (from Java) in MFC

Hi, another small question: is there an option / method in c++ together with MFC to create a panel (like in java) where all items of this area (panel = rectangle) are included? So that you are able to hide all these items if you hide this panel? Here`s a small description of the "panel" in java http://java.sun.com/docs/books/tutorial/uiswing/components/panel.html (The JPanel class provides general-purpose containers for lightweight components - like buttons and any other items from the tool menu in VS) best regards Hans

Reminder - Microsoft Responds to the Evolution of Community

What is Happening? This message is to inform you that Microsoft will soon begin discontinuing newsgroups and transitioning users to Microsoft forums. Why? As you may know, newsgroups have existed for many years now; however, the traffic in the Microsoft newsgroups has been steadily decreasing for the past several years while customers and participants are increasingly finding solutions in the forums on Microsoft properties and third party sites. This move will unify the customer experience, centralize content, make it easier for active contributors to retain their influence, miti