C / C++ / MFC Discussion Boards

Member 403228-May-00 5:41

28-May-00 5:41

Hi,

Is it possible to change the menu which resides in the menu bar in run-time? I would to enable/disable pop-up menus which resides in the command bar menu.
I know how to modify menu item inside a menu but I don't know how to change the top pop-up menu.

Thanks,

Shai

Re: Menu in the menu bar

Brian Hart25-Jun-00 13:23

Brian Hart

25-Jun-00 13:23

Dear Shai,

Here's something that might help:

BOOL CMainFrame::DoChangeMenu()
{
CMenu menu;

if (!menu.LoadMenu(IDR_MYMENU))
return FALSE;

if (!SetMenu(&menu))
return FALSE;

DrawMenuBar(); // refresh menu bar with new menu
return;
}

Hope that helps! Smile | :)

Integer operations

Andreas Jäger27-May-00 22:19

Andreas Jäger

27-May-00 22:19

Hi,

how can I detect whether an integer operation like a+b or exp(i) generates an overflow? When adding two big numbers like INT_MAX-4 and INT_MAX-25, the result will be negative and no error is generated. In mathematics, such overflows can also happen when using __int64 data type. Who has a solution?

Thanks
Andreas

Re: Integer operations

Tim Deveaux28-May-00 8:01

Tim Deveaux

28-May-00 8:01

You can test the overflow flag with the _asm instructions jno and jo. You can also explicitly invoke the integer overflow trap if you want to use exceptions:

void CTestDirDlg::OnButton2() 
{
    // test big ints...

    int a, b, c;
    a = INT_MAX - 4;
    b = INT_MAX - 25;

    try {
        c = a + b;
        _asm  {
            // if OV flag not set, were ok...
            jno wereOk;
            // overflow occurred - force the trap...
            int 4;  // the asm INTO statement works too... 
       }
    }
    catch(...) {
        MessageBox( "Overflow!", "Error");
    }

    wereOk:
    return;
}

I realize there is the issue of portability here, but its one possible solution - could be refined. Using SEH you might be able to identify the EXCEPTION_INT_OVERFLOW exception with more certainty than the catch(...), and avoid the _asm.

You might not even want to throw the exception, just test the flag.

I think there is code out there somewhere that can convert these kinds of traps to C++ exceptions - or perhaps it would be better to just throw our own exception object, rather than invoking the processor trap. The trap might be useful if you want to enable first-chance exception handling for c0000095.

I can't seem to find a way to enable this trap in the way that we can enable floating point exceptions with controlfp.

Re: Integer operations

Andreas Jaeger1-Jun-00 5:55

Andreas Jaeger

1-Jun-00 5:55

OK, works fine. But what is with other operations like multiplication, and other data type like long or __int64?

Dialog

Member 434827-May-00 10:53

Member 4348

27-May-00 10:53

How can I change resource for dialog form a meny in that dialog.

urgent:keyborad acts funny on mainframe dlgbar

gordon26-May-00 16:13

gordon

26-May-00 16:13

hi,

i am using MFC, i create a CDialogBar in a CRebar and my CDialogBar has 3~4 editboxes, however, i cannot uses ctrl+c or ctrl+v in these textboxes anymore and also cannot tabs thru the controls. the problem is so obvious so i think it must be something i missed.

pls help!!

gordon

Maximizing app at startup - how?

Mike Newberry26-May-00 12:47

Mike Newberry

26-May-00 12:47

Can someone please enlighten me about how to maximize the app's mainframe at startup? I have tried calling ShowWindow() from the InitInstance() and that doesn't do it. I've looked through the MS docs in the Visual Studio 6 and not come accross anything relevant (like a code snippet, for example!) Some pointers would be greatly appreciated!

One person suggested setting the style to WS_MAXIMIZE in PreCreateWindow() but that does not do it.

Re: Maximizing app at startup - how?

Richard Warg26-May-00 13:38

Richard Warg

26-May-00 13:38

In the CWinApp descendent:

// The one and only window has been initialized, so show and update it.
m_pMainWnd->ShowWindow(SW_SHOWMAXIMIZED);
m_pMainWnd->UpdateWindow();

SW_SHOWMAXIMIZED does it for you.
Also in the Application wizard in step 4 of 6 there's an Advanced Button. Follow that button to the Windows Style Tab and check the Maximized box.

Re: Maximizing app at startup - how?

imsniper28-May-00 23:26

imsniper

28-May-00 23:26

Both of them are correct!!
but only if you join both of their answers

at InitInstanse there is a variable called

p_MainWnd

do the following

p_MainWnd->ShowWindow(WS_MAXIMISE);

a good place to put it is at the end of that function

Re: Maximizing app at startup - how?

Member 7505-Jun-00 18:29

Member 750

5-Jun-00 18:29

You don't want to pass WS_MAXIMIZE, a style code, to ShowWindow.

You're supposed to do as Mr. Warg pointed out:

Change

pMainFrame->ShowWindow(m_nCmdShow);
pMainFrame->UpdateWindow();

to

pMainFrame->ShowWindow(SW_SHOWMAXIMIZED);
pMainFrame->UpdateWindow();

Note the WS_* in front means a *W*indow *S*tyle code, whereas the SW_* in front means a *S*how*W*indow code.

AppWizard supplies the

pMainFrame->ShowWindow(m_nCmdShow);
pMainFrame->UpdateWindow();

code for you; all you have to do is to replace the m_nCmdShow with SW_SHOWMAXIMIZED, and you're in business!!

Brian Hart

Not responding apps

Bruno Vais26-May-00 8:02

Bruno Vais

26-May-00 8:02

I'm trying to find out from an application if another one has blocked (ie. "Not responding" in the NT Task Manager). How do I do that?

Thanks

marcro for comment word-wrap reformat

Philip Winston26-May-00 5:28

Philip Winston

26-May-00 5:28

Do any of these extra macros for code formatting do word wrapping on comment blocks? I would really like something like this. So when you have a large comment block like:

// blah blah blah blah blah blah blah blah blah
// blah blah blah blah blah blah blah blah blah
// blah blah blah blah blah blah blah blah blah

And you have to edit it a lot, you don't have to manually word wrap it. Anyone know a macro that does this?

CDC::SelectObject returns NULL

Paul Ebert26-May-00 4:27

Paul Ebert

26-May-00 4:27

Can anyone explain the situations in which SelectObject will return NULL? I'm writing code to print a bitmap (see my message in the discussion for the article "Printing Made Easy") and it is returning NULL. My bitmap and memDC appear to be fine.

Thanks in advance.

HitTest on CTreeCtrl (Dialog Based)

daniel madden26-May-00 4:08

daniel madden

26-May-00 4:08

I am trying to capture the Tree Item the cursor is over and when I use the below code in the "Right-Click"...It always returns NULL??? Can anyone help me???

CPoint MousePosition;
GetCursorPos(&MousePosition);

TVHITTESTINFO HitInfo;
HitInfo.pt = MousePosition;

if (m_ctrlTree.HitTest(&HitInfo) != NULL) {
int Mask = TVHT_ONITEM | TVHT_ONITEMRIGHT;

if (HitInfo.flags & Mask) {
m_ctrlTree.Select(HitInfo.hItem, TVGN_CARET);
CString csTest = m_ctrlTree.GetItemText(HitInfo.hItem);
MessageBox(csTest);
}
}

Dan

Re: HitTest on CTreeCtrl (Dialog Based)

Mike Dunn26-May-00 8:13

Mike Dunn

26-May-00 8:13

GetCursorPos() returns screen coordinates. You need to convert that point to client coordinates of the tree control:

m_ctrlTree.ScreenToClient ( &MousePosition );

Re: HitTest on CTreeCtrl (Dialog Based)

daniel madden26-May-00 9:39

daniel madden

26-May-00 9:39

Thanks Mike...That was it, I guess sometimes it takes a new set of eyes to see clearly. I actually used this before but had commented out the "GetCursorPos()" instead of leaving it there???

Thanks again,

Dan

Removing loaded DLLs after app crash

Jeremy Davis26-May-00 0:04

Jeremy Davis

26-May-00 0:04

I'm developing an app that usues msvfw32.dll and avicap32.dll in Win98. If either when running under debig mode I press SHIFT+F5 (end debug) or something I wrote causes the app to crash the two DLLs stay loaded. In then need to reset my PC for everthing to work again.

Does anyone know how I can remove loaded DLLs in win98 please? It's a pitty the CTRL+ALT+DEL window doesn't list them!

Thanks

CPrintDialog, customizing

djordj25-May-00 11:27

djordj

25-May-00 11:27

I have made a custom CPrintDialog and I want touse it instead of the default one, without manage the whole printing process.
Can I tell MFC to use my dialog just before the beginning of the process?

Thanks, ...

Re: CPrintDialog, customizing

Chris Meech26-May-00 6:26

Chris Meech

26-May-00 6:26

You will likely need to implement in your CView derived class, a DoPreparePrinting() method and do *NOT* call the base class method. You will still need to set all of the PRINTINFO structure members as required, but instead of using CPrintDialog member, you can instantiate your own dialog instead. Have a peek at the MFC source in VIEWPRNT.CPP for what the base class does and that should help you figure out the stuff you need to do instead.

HTH.

IPX programming. Posible in windows?

Markus25-May-00 9:12

Markus

25-May-00 9:12

Project: Write a simple program that will sit in background and alow easy and reliable transfer of files from computer to computer on a windows network.

Problem: At first I thought it would be a simple task of slight modifications to an old pascal IPX chat program that I wrote mainly in assembly a year or so ago. BUT I now found out that I can not use inturrupts in Inline Assemebly in VC6++.

Does this mean that I have got to learn WinSock if I want to program a network program or is there another way to send IPX data over a network using VC6++?

Re: IPX programming. Posible in windows?

Frank Deo25-May-00 10:29

Frank Deo

25-May-00 10:29

I don't think there is any "Built In" IPX functionality in MFC or in the Platform SDK, but I may be wrong.

What about downloading the Novell SDK from developer.novell.com?

Re: IPX programming. Posible in windows?

Alex Gorev25-May-00 10:29

Alex Gorev

25-May-00 10:29

Hi Markus,

Why don't you like the Windows Sockets...? It is not complicated at all...

We do sell lots of C++ classes and ActiveX controls which can make your life much easier. Check TCP/IP product at www.dundas.com

Regards,
Alex Gorev,
Dundas Software.

Re: IPX programming. Posible in windows?

Member 120896525-May-00 11:05

Member 1208965

25-May-00 11:05

Markus,

What are you trying to do exactly? There are lots of communications options for networking under Windows, and certainly IPX is one of them.

I've seen a few IPX programming toolkits around, but I don't think it's a popular way to approach communication these days (even Novell has gone TCP/IP).

Re: IPX programming. Posible in windows?

Markus25-May-00 12:24

Markus

25-May-00 12:24

I'm trying to write a program that will enable easy transfer of files from one computer to another. Because when I try and back up files over a windows network with network neighbourhood it has a tendency to hang all way though copying the data.
My final program will ideally sit in the taskbar dealing with any relevant packets that are received and automatically deal with them, ie requests for files of that computer. It will also allow you to view all available uses and there shared files.
My reason for using IPX was that I have already got experience with the protocol as I have written a number of dos programs in Pascal that use IPX. As I can not use interrupts in a win32 executable I can not use the assembly I used in these Pascal programs.
as far as I was aware TCP/IP was used for the internet an not for LANs. So if any one can suggest a good protocol for this type of problem and were I could get some information on it. It would be much appreciated.

Last Visit: 31-Dec-99 18:00 Last Update: 29-May-24 1:13

Refresh

ᐊ Prev 1...18631 18632 18633 186341863518636 18637 18638 18639 18640 Next ᐅ

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.