C / C++ / MFC

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Re: How to stop this memory leak? Mark Tutt15-Mar-02 10:32 Mark Tutt 15-Mar-02 10:32  Yeah, I turned the MFC suppression stuff on, but this one was the only one that still showed up, and was a significant amount. Most everything else was a one time leak. It's wrong in some of my stuff as well, I've set a breakpoint on the line where the free or delete happens, seen it execute, written down the memory location and seen BC report it as a leak. Overall it's a great tool, but sometimes it's a little flaky. It seems to be worse with older C code that does malloc/free calls than with new/delete... Thanks! Everytime I think I've hit the bottom, someone lends me a shovel. Strings!!! 15-Mar-02 7:49 15-Mar-02 7:49  Hey there, i know this may sound simple to some but i need some help on getting a string from a text box to a list box. You see i have a button that when pressed, i need to add the value string of the textbox to the listbox. Can someone please help me. Thanx Re: Strings!!! Mike.NET15-Mar-02 8:00 Mike.NET 15-Mar-02 8:00  this should help, although I have not run it though complier CString stText; GetDlgItemText(ID_MYTEXTBOX, stText); m_lstBox.AddString(stText); Mike How to make MFC apps use less RAM? Mike.NET15-Mar-02 7:44 Mike.NET 15-Mar-02 7:44  Are there any optimization options (or compiler switches) that would decrease amount of memory required by Release build of MFC apps? I know that memory consumption should be the least concern in these days, but I have small SystemTray app., and it eats quite a bit of RAM. The answer to my problem is to *not* use MFC to write SystemTray application, but writing in C++, would seem bit barbaric. If there are no optimization options or compiler switches to minimize memory consumption, is there a method that at least would tell Windows OS to use *page file*, while the program is inactive? thanks in advance Mike Re: How to make MFC apps use less RAM? Shog915-Mar-02 7:53 Shog9 15-Mar-02 7:53  Starting at the end, you don't have to *tell* windows to use the page file, it will do so on it's own; not sure what algorithm it uses to determine what blocks to swap out, but i'm sure as long as your program is sitting quietly, it will Do The Right Thing. If you want to try using something other than MFC, ATL+WTL sounds like it might be a good choice. Don't use it myself though, so can't say for sure. Finally, a quick-and-easy way to go would be to compile using MFC as a shared library, and use some of the tips given in these articles: http://www.codeproject.com/tips/reducesixeexe.asp http://www.codeproject.com/tips/aggressiveoptimize.asp And if words were wisdom, I'd be talking even more. The Offspring, I Choose Visual Studio .NET customization Todd Smith15-Mar-02 7:26 Todd Smith 15-Mar-02 7:26  1. Can you create syntax hilighting for a new filetype? 2. Can you associate a new file extension with as an existing type? (ie .tmpl as an HTML file) <rant> 1. Its cool that you can save a keyboard scheme but it sucks that you can't do the same for fonts and colors. You have to export the registry settings. 2. You can't have more than 1 row of window tabs (or can you?). Scrolling gets annoying. 3. It seems really slow when you select a filter in help. 4. The HTML editor adds lots of crap to your code. Todd Smith CPUA 0x007 ... shaken not stirred Calling CListview in MDI application Jasmyn15-Mar-02 6:05 Jasmyn 15-Mar-02 6:05  I have created an MDI application whose view is derived from CList. I only have one view and one document. I have used the cmdInfo.m_nShellCommand = CCommandLineInfo::FileNothing; option to disable the default OnFileNew(). Now I have a application that opens with only a menu. How do I now call my List view(default view) from the mainframe menu? I have added a menu Item, attached a handler to it and tried calling OnFileNew from there. But no List view. Sob. I have read a million msdn files, 2 chapters on MDI applications but still no flashes of intelligence. I'm trying to populate my ListView9defaultview) with items by directly accessing its list control through a call to GetListCtrl() in the OnInitialUpdate() function in my view class. If I take the code populating the control out from OnInitial update, I get a white empty file opening, if I leave it in I get a file with exactly the same grey background as my main window. Am I maybe missing the plot completely? I hope I'm making sense, my brain is so fried it took me 20 minutes to find my office key and leave the building. Please help! Grasp it but you cannot get it! It's name is memory.. further details Jasmyn15-Mar-02 6:43 Jasmyn 15-Mar-02 6:43  Had a cup of tea, am felling calmer so here are more details. The view that I'm trying to call is derived from CListview and is a report style List view showing database information in an Access like gridview. This is the code I'm using to initialise it DWORD dwExStyle; CRepPartDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); //CActionsApp *pApp = (CActionsApp*)AfxGetApp(); CListCtrl& m_List = GetListCtrl(); dwExStyle = m_List.GetExStyle(); dwExStyle |= LVS_EX_FULLROWSELECT | LVS_EX_GRIDLINES; m_List.SetExtendedStyle(dwExStyle); m_List.SetBkColor(RGB(255, 255, 255)); ASSERT(m_List.GetBkColor() == RGB(255, 255, 255)); m_List.InsertColumn(0,_T("Share"),LVCFMT_LEFT,160); m_List.InsertColumn(1,_T("Status"),LVCFMT_LEFT,90); m_List.InsertColumn(2,_T("Action Date"),LVCFMT_LEFT,90); m_List.InsertColumn(3,_T("Book Date"),LVCFMT_LEFT,90); m_List.InsertColumn(4,_T("Comment"),LVCFMT_LEFT,160); I have used it before in a SDI application that opened on this view with no problems whatsoever, which leads me to believe there must be a special way of calling the same view from a menu within a MDI application that I'm missing. This is the only code I have in the menu handler function at the moment CRepPartApp* pApp = (CRepPartApp*)AfxGetApp(); pApp->m_pDocManager->OnFileNew(); All the example's I can find deals with multiple document and views and switching between them. It is a new job and I'm feeling a bit incompetent so any pointers would be much appreciated Grasp it but you cannot get it! It's name is memory.. too simple question about modeless dialog? lucy15-Mar-02 5:11 lucy 15-Mar-02 5:11  I tried a search but didn't find anyone ever asked this question. Is it too simple? Well, my question is, in my SDI application, on menu item -- action -- I would display a modeless dialog. the code is: CMyDialog *pdlg; pdlg = new CMyDialog(); if ( pdlg != NULL ) { pdlg->Create(IDD_MY_DLG, this); pdlg->ShowWindow(SW_SHOW); } The dialog shows and functions well, but it would be always on the top, even when it lost focus. Is it possible to hide it behind my SDI application when I click on my SDI? Thank you! Re: too simple question about modeless dialog? Tomasz Sowinski15-Mar-02 5:22 Tomasz Sowinski 15-Mar-02 5:22  You may try with changing 2nd parameter in the call to CYourDialog::Create to GetDesktopWindow(). Tomasz Sowinski -- http://www.shooltz.com Re: too simple question about modeless dialog? lucy15-Mar-02 6:02 lucy 15-Mar-02 6:02  Hi Tomasz, your advice works well to hide my modeless dialog. Thank you! But by passing GetDesktopWindow() instead of "this" as the second parameter, I couldn't get access to my SDI in the dialog using GetParent(). I need to post back some message to my SDI in the dialog when a button is pressed. Any suggestion? Re: too simple question about modeless dialog? lucy15-Mar-02 6:21 lucy 15-Mar-02 6:21  hmm, maybe I can add a member variable of CMyview to myDialog and initialize it after I create the dialog. OLEDB Provider Mauricio Ritter15-Mar-02 4:46 Mauricio Ritter 15-Mar-02 4:46  Does anyone ever developed one ? Where I can find information about this ? Mauricio Ritter - Brazil Sonorking now: 100.13560 Trank Re: OLEDB Provider Tomasz Sowinski15-Mar-02 4:55 Tomasz Sowinski 15-Mar-02 4:55  MDAC SDK should have this info. There's even 'Sample OLEDB Provider' sample, at least in v2.5 which is on my disk. Tomasz Sowinski -- http://www.shooltz.com Re: OLEDB Provider Mauricio Ritter15-Mar-02 5:02 Mauricio Ritter 15-Mar-02 5:02  Tks ! Mauricio Ritter - Brazil Sonorking now: 100.13560 Trank hardware access, direct control, driver source Kuniva15-Mar-02 4:45 Kuniva 15-Mar-02 4:45  Till now on, i've always just written programs using C, often MFC along with it. But i just keep calling functions and i know how to use all of that but i dont really understand how they work... i mean, i would like to know: a) Is it possible to directly access hardware through C (like for example video memory) b) Where can i get examples/source of this?? (for instance winsock source or some display library or something) I just mean that i would like to be able to work on a lower level closer to the hardware to manipulate it better, like for example whats the code to draw a black pixel on the screen in pure C? don't you need to access the video card or something? (when not using ready-made api's) I hope you know what i mean... Thanks. Kuniva -------------------------------------------- God gave man a penis and a brain but not enough blood to make both of 'em work at the same time. Re: hardware access, direct control, driver source Tomasz Sowinski15-Mar-02 4:49 Tomasz Sowinski 15-Mar-02 4:49  Windows and other OSes generally isolate you from hardware through their abstraction layers. So you can't get the address of video memory and write a byte there. Instead you have to use DirectX, which is a part of OS and provides the programmatic interface for you. The layer between your program and hardware is not very thick in this case. OTOH, if you want to go hardcore, you'll need to create a device driver. These are the beasts which are allowed to talk to hardware directly. Tomasz Sowinski -- http://www.shooltz.com Flush System Buffers for a Drive Brad Manske15-Mar-02 4:22 Brad Manske 15-Mar-02 4:22  I'm trying to flush all system buffers associated with a drive on a Win 2k system. The only way I found is to use an Int 21h function 710Dh from the SDK documentation. Can anyone think of another simple way to do this? I think this will help me with my testing, but it isn't worth spending a lot of time on. Brad Manske Re: Flush System Buffers for a Drive Tomasz Sowinski15-Mar-02 4:30 Tomasz Sowinski 15-Mar-02 4:30  Brad Manske wrote: The only way I found is to use an Int 21h function 710Dh from the SDK documentation. Does Int 21h work on W2k? Tomasz Sowinski -- http://www.shooltz.com Re: Flush System Buffers for a Drive Brad Manske15-Mar-02 4:36 Brad Manske 15-Mar-02 4:36  I'm guessing that it will not. The page in the SDK is under a heading for 95/98/ME. Brad Manske Re: Flush System Buffers for a Drive Tomasz Sowinski15-Mar-02 4:41 Tomasz Sowinski 15-Mar-02 4:41  I'd look into DeviceIoControl. There's a control code, FSCTL_LOCK_VOLUME, which apparently does flush the buffers. You could lock and unlock immediately. I've never done this, however - treat this with 1e6 milligrams of salt. Tomasz Sowinski -- http://www.shooltz.com Re: Flush System Buffers for a Drive Ravi Bhavnani15-Mar-02 4:38 Ravi Bhavnani 15-Mar-02 4:38  As much as 1 kg. of salt? Perhaps you meant 1e3 milligrams. /ravi "There is always one more bug..." http://www.ravib.com ravib@ravib.com Re: Flush System Buffers for a Drive Tomasz Sowinski15-Mar-02 4:51 Tomasz Sowinski 15-Mar-02 4:51  Ravi Bhavnani wrote: Perhaps you meant 1e3 milligrams No, when I write 1e6 I mean 1e6 This DeviceIoControl is quite low level for my taste. If the guy looses his data, I don't want to be responsible Tomasz Sowinski -- http://www.shooltz.com Re: Flush System Buffers for a Drive Brad Manske15-Mar-02 5:11 Brad Manske 15-Mar-02 5:11  Tomasz Sowinski wrote: No, when I write 1e6 I mean 1e6 LOL I didn't even notice the quantity specified. Now I feel like I really got my money's worth. Brad Manske Re: Flush System Buffers for a Drive Brad Manske15-Mar-02 5:09 Brad Manske 15-Mar-02 5:09  I've looked through the documentation and it looks like it might work. If it doesn't, it would only be a little more work to try dismounting the volume. So I now have several more things to try. Thanks for your help. Brad Manske

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