C / C++ / MFC

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Re: Using of one object in three dialog ... Stan Shannon12-Jul-01 4:59 Stan Shannon 12-Jul-01 4:59  Actually, Tomasz, I would not mind having an explanation of the advantage of static_cast over the old fashioined ((CMyApp*)AfxGetApp())->WhatEver() in this case. Re: Using of one object in three dialog ... Tomasz Sowinski12-Jul-01 7:00 Tomasz Sowinski 12-Jul-01 7:00  The only syntactic difference is that static_cast won't compile if CYourApp isn't derived from CWinApp, which is highly unlikely. It's just my personal preference to cast the C++ way. Tomasz Sowinski -- http://www.shooltz.com Re: Using of one object in three dialog ... Hadi Rezaee13-Jul-01 18:26 Hadi Rezaee 13-Jul-01 18:26  Hi Tomasz, Thank you for your explain ... Now, can you write example about using of m_db from AfxGetApp() ? Because in your example you use of GetDatabase() in AfxGetApp(), now can you write example about using m_db in AfxGetApp() ? My month article: Game programming by DirectX by Lan Mader. Please visit in: www.geocities.com/hadi_rezaie/index.html Hadi Rezaie Re: Using of one object in three dialog ... CMFC6.0VS.NETUser12-Jul-01 4:48 CMFC6.0VS.NETUser 12-Jul-01 4:48  AfxGetApp() (if I rememeber right)is a gobal function in MFC which returns a pointer to your CWinApp derived class so you can use "->GetDatabase()" Any public function in this CWinApp derived class called from dialog(other class also outside this discussion) can be called this way. Re: Using of one object in three dialog ... Stan Shannon12-Jul-01 5:49 Stan Shannon 12-Jul-01 5:49  In all honesty, I don't feel that exposing your db as a pointer or a reference is the best design. I think it would be far better to simply put the db in the mainframe class (or possible a doc class) and have a means of communicating data back and forth between the db and the UI by some sort of intermediate set of classes. i.e.: class CSomeDBData // or a struct if your prefer. { //whatever }; CMainFrmame::OnSomeCommand() { CMyDialog MyDlg; CSomeDBData somedata; m_db.GetSomeData(&somedata); MyDlg.EditSomeData(somedata);// or however you like. if( MyDlg.DoModal() == IDOK ) { MyDlg.GetSomeEditedData(somedata);// or however you like. m_db.SetSomeData(&somedata); } } This way, you don't end up with pointers and references to your core objects scattered all over your application. Which, as the application grows, will certainly happen unless you take steps to limit it. If your app is large you should concentrate on keeping data centralized and not globally available to anything that might need to access it or which might store pointers to it. This takes a little extra work, but pays off in the long run. Re: Using of one object in three dialog ... Hadi Rezaee13-Jul-01 18:19 Hadi Rezaee 13-Jul-01 18:19  Hi, Thank's it was nice help ... My month article: Game programming by DirectX by Lan Mader. Please visit in: www.geocities.com/hadi_rezaie/index.html Hadi Rezaie Re: Using of one object in three dialog ... Hadi Rezaee14-Jul-01 1:49 Hadi Rezaee 14-Jul-01 1:49  Hi again Stan, Your idea was very good, but i have little problem ... I can check the return value of DoModal() for checking the hited button ... But when i click on button in the dialog, dialog will close !!! Now, i want to use of button in the dialog in CManFrame class without dialog will close ... How can i do that ? My month article: Game programming by DirectX by Lan Mader. Please visit in: www.geocities.com/hadi_rezaie/index.html Hadi Rezaie Re: Using of one object in three dialog ... Stan Shannon14-Jul-01 3:38 Stan Shannon 14-Jul-01 3:38  First, I have never used the DAO classes (I typically use CDatabase/CRecordset for simple stuff and ADO for anything else). So I cannot address issues relatiing to DAO specifically. There may be easier techniques for you to use than what I am suggesting for DAO built into MFC. If you look at MSDN or Codeproject samples you might find something relating to that. Yes, DoModal returns when the dialog box is closed. That is by design, and is typically the behavior you want. Obviously, I don't know the details of your design, and maybe what I'm suggesting will not work for you. All I'm saying is that it is the approach I *always* take, as I have found it to be a very safe and simple way to do business, especially in a large application that many people have their hands on. What I am suggesting is that you copy the data that you want to manipulate from the db object, which is "owned" by the MainFrame object, to the dialog box, initializing the dialog box with that data (there are various opinions about how to do that best). Next you allow the user to manipulate that data in the dialog box. Finally, if the user hits OK you copy the edited data from the dialog box and back to the db object, if the user hits cancel, do nothing at all. In this way, the dialog box never needs to know that the db object even exists, and the db needs to know nothing about the dialog. Only the Mainframe window (and the db object itself, of course) knows, or cares, about the db object, or the dialog. In this way, the db object, and whatever global data it contains, is not made public to the entire application unnecessarily. If the db data also needs to be accessed from objects other than dialogs, (views, for example), than that might be an argument for giving ownership of the db object to your document class rather than the Mainframe. If more than one document/view needs access to the db data, well, than you might need to consider letting the App class handle it afterall. As the programmer, its your call. CImageList containing variable width images ov11-Jul-01 22:34 ov 11-Jul-01 22:34  I want to use CGfxOutBarCtrl class, but I need to display an icons with variable width (height is permanent) in it. All icons are adding via CImageList but it stretch all of them to the maximal size. Do you have any ideas how to display such type of icons there? With the best regards, Vitaly. Re: CImageList containing variable width images 12-Jul-01 1:57 12-Jul-01 1:57  You would have to use two, or more, imagelists. As you found out everything in the imagelist must be the same size, that is how individual images are found, by calculating the offset based on the size. provider for access? Gérald Mercet11-Jul-01 22:31 Gérald Mercet 11-Jul-01 22:31  i would use the ADodb method to create a link between an vc++ application and Access 97. what is the correct microsoft jet OLEDB i need to use, 4.0 or 3.51? gerald Re: provider for access? Anders Molin12-Jul-01 1:24 Anders Molin 12-Jul-01 1:24  Access97 uses 3.51, but 4.0 should be backward compatible. - Anders Money talks, but all mine ever says is "Goodbye!" small problem(so I hope) with a small spin . Please help !!! 11-Jul-01 22:13 11-Jul-01 22:13  I have editBox (read only) with spin. the variable of the editBox is int in range 10 - 2000 and the range of the spin is same. and all is right. But when the user try to up the number in the editBox over 999 he gets a error messageBox: "Please enter an integer." WHY ????????????????????????????????????????????????? Please HELP Re: small problem(so I hope) with a small spin . Please help !!! Michael Dunn11-Jul-01 22:31 Michael Dunn 11-Jul-01 22:31  Uncheck the No Thousands property of the spin control - this prevents the control from adding a thousands separator (period or comma) to the number. --Mike-- http://home.inreach.com/mdunn/ Push the button, Frank. Thank ! But I did not understant , What I need to do ??? 11-Jul-01 22:48 11-Jul-01 22:48  Thanks on the quickly answer !!! Gray the desktop problem 2 inforix11-Jul-01 21:54 inforix 11-Jul-01 21:54  I have gray the desktop, but there still some area cannot be grayed, how can I gain this effect. I use CreateDIBSection. and BitBlt to copy the memory dc to the desktop. Gray the desktop problem inforix11-Jul-01 20:59 inforix 11-Jul-01 20:59  I have try to gray the desktop when my program runs. by there are still some problems: 1, If I use CreateDIBSection, What bitsperpixel should I use, 8, or >8? 2, If I can use 32bits, even on 16 desktop settings? open folder 11-Jul-01 20:56 11-Jul-01 20:56  hi.. I wanna open a folder from my software...Can i do that?????? Re: open folder coder847211-Jul-01 22:33 coder8472 11-Jul-01 22:33  I don't know exactly what you mean, but try looking up SHBrowseForFolder in the MSDN Lib maXallion   "Look for bugs, I hate bugs!" - Warden, The Mummy   www.maxallion.de - coded evil & more Time Diff in C++ and Windows Tray??? Dan Madden11-Jul-01 20:50 Dan Madden 11-Jul-01 20:50  I have two different times on my box...In VC++ the time says "1:40" and in the System Tray it says "8:40"?? Even when I write a program using the System time in VC++ I get the C++ time and NOT the actual System Time?? Settings: Region(Locale)/Keyboard: U.S. Time Zone: Germany (-1) The funny thing is this is the Time (-7 hours) as our Mother Company in the US. I hope someone can show where the problem is. Thanks in advance, Dan Re: Time Diff in C++ and Windows Tray??? Anders Molin12-Jul-01 1:20 Anders Molin 12-Jul-01 1:20  You don't say what function you use to get the time, but if you use time(), you have to convert the time with localtime() to get the local time... - Anders Money talks, but all mine ever says is "Goodbye!" Combo box border Dejan Petrovic11-Jul-01 19:55 Dejan Petrovic 11-Jul-01 19:55  Does anybody know the way to get rid of the thick (client?) border around the edit portion of combo box? Regular methods (that work with other controls) seem to have no effect. Trying to make a property list control. Thanx, Dejan, Melbourne Not print the brush creating with Bitmap Eugene Pustovoyt11-Jul-01 19:09 Eugene Pustovoyt 11-Jul-01 19:09  The example of a code, which one is fine draws on a screen, but is absolutely failed to print (except for a framework of an rectangle). CTestView::OnDraw(...) { CBitmap m_bitmap; m_bitmap.LoadBitmap(IDB_ ...); CBrush m_brush; m_brush.CreatePatternBrush(&m_bitmap); CBrush * pSysBrush = pDC->SelectObject(&m_brush); pDC->Rectangle(0, 0, 300, 300); pDC->SelectObject(pSysBrush); } How to make correctly? Re: Not print the brush creating with Bitmap Christian Graus11-Jul-01 19:29 Christian Graus 11-Jul-01 19:29  When you print you'll be working with a much bigger DC than on the screen. It probably printed a dot somewhere near the top. You need to query the printer DC to find out it's size and then scale the bitmap accordingly. Christian #include "std_disclaimer.h" People who love sausage and respect the law should never watch either one being made. The things that come to those who wait are usually the things left by those who got there first. Add ActiveX in a modeless windows Francis B.11-Jul-01 17:20 Francis B. 11-Jul-01 17:20  I want to add a Capture Video ActiveX in my program. When I add the ActiveX in my mainframe (CMyAppDlg) and that I use the associated functions with this activeX, I don`t have any problem. But I want to add this ActiveX in a modeless windows created by a item menu. The problem is when I include this ActiveX in my modeless windows and that I call the associated functions to the ActiveX, I have a Assertion Error: "Debug Assertion Failed!" in the file "Winocc.cpp" for each call of a function of this ActiveX. So, I don't know why the ActiveX work in my mainframe but doesn't work in the modeless Windows since I use the same code in the two manner? Thanks for your help! Francis B.

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