C / C++ / MFC Discussion Boards

BobInNJ1-Jan-09 11:09

1-Jan-09 11:09

I am developing an application using C++ and MFC. Please consider the following code from a Windows RC (Resource Script) file:

<br />
<br />
IDR_MAINFRAME MENU<br />
BEGIN<br />
    POPUP "&File" {<br />
        MENUITEM "&New",                CALC_FILE_NEW<br />
        MENUITEM "Calculate"            CALCULATE<br />
        MENUITEM "Abort Calculation"    ABORT_CALCULATION,GRAYED<br />
        MENUITEM "&Exit",               CALC_FILE_EXIT<br />
    }<br />
    .<br />
    .<br />
    .<br />

I would expect the third menu selection to be grayed out. That is, the user should not be able to select it. However, this is not what happens. I would like to know why?

Thanks

Bob

Re: Menu Items

Richard Andrew x641-Jan-09 11:27

Richard Andrew x64

1-Jan-09 11:27

I think you also have to specify that it's disabled as well.

Re: Menu Items

BobInNJ1-Jan-09 12:31

BobInNJ

1-Jan-09 12:31

Richard,

Thanks for the response. However, I do not think DISABLED is a valid option for creating the menu item. When I tried it, it would not going through the resource compiler. The line I tried
was:

<br />
        MENUITEM "Abort Calculation"    ABORT_CALCULATION,GRAYED,DISABLED<br />

Was that what you meant?

Bob

Re: Menu Items

Richard Andrew x641-Jan-09 12:35

Richard Andrew x64

1-Jan-09 12:35

You're right. I checked the docs, and the word I was thinking of is "INACTIVE", not "disabled".

However, it says that GRAYED should do what you are looking for.

Can you say what behavior you are observing when you use just GRAYED?

Re: Menu Items

BobInNJ1-Jan-09 12:40

BobInNJ

1-Jan-09 12:40

Richard,

What I would like is the menu option to be set in such a way that the user cannot select it. In addition, when the menu is displayed, it should be displayed in such a way that it looks disabled to the user.

Thanks

Bob

Re: Menu Items

Richard Andrew x641-Jan-09 12:39

Richard Andrew x64

1-Jan-09 12:39

I see that you are missing commas in a couple of locations in your MENUITEM list.

Perhaps that is the cause of the malfunction?

You're missing commas on the Calculate and Abort Calculation menu items.

Re: Menu Items

BobInNJ1-Jan-09 12:56

BobInNJ

1-Jan-09 12:56

Richard,

Thanks for the response. I tried adding those missing commas as you suggested but it did not solve my problem.

Bob

Amcap C++ source code!

Hadi Dayvary1-Jan-09 9:40

Hadi Dayvary

1-Jan-09 9:40

Hi I need Amcap c++ source code(Active Movie Capture c++ sample), but I can not not find it in visual studio folder or in internet!
please give a link to it's source code,
thanks

www.logicsims.ir

Re: Amcap C++ source code!

Jijo.Raj1-Jan-09 10:19

Jijo.Raj

1-Jan-09 10:19

Amcap is a DirectShow Sample[^]. You have to install Windows SDK[^] for it. Well, check this[^] link too, which will be helpful to you.

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Re: Amcap C++ source code!

Hadi Dayvary1-Jan-09 20:57

Hadi Dayvary

1-Jan-09 20:57

Thank you
But I can't download Windows SDK, it's too big, I just wanna Amcap source code, I know it's DirectShow sample, and I've seen that 'How to compile AMCap' page,

www.logicsims.ir

"C++" Base64 De/En coding Class

Joseph Marzbani1-Jan-09 8:36

Joseph Marzbani

1-Jan-09 8:36

Would you direct me to an address to download a "C++" Base64 De/En coding Class for free please?

Thank you masters!

Re: "C++" Base64 De/En coding Class

Mark Salsbery1-Jan-09 8:46

Mark Salsbery

1-Jan-09 8:46

I don't have a specific link to a download, but
there's lots of sample code here[^] Smile | :)

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: "C++" Base64 De/En coding Class

Dark_eye1-Jan-09 9:37

Dark_eye

1-Jan-09 9:37

A very good one, in STL:
http://www.adp-gmbh.ch/cpp/common/base64.html[^]

Re: "C++" Base64 De/En coding Class

bob169721-Jan-09 11:49

bob16972

1-Jan-09 11:49

Why not just implement the frackin thing. It is probably one of the simpler encoding schemes to implement and is about one page of code for the encoder method and one page for the decoder method.

IMO, a C/C++ programmer should have implemented the algorithm at least once in their career. Libraries are nice but implementing this one helps keep the rust out and gives you a tad more independence.

All the necessary information and links to the RFC's and sample source code are here[^]

UnClickable window... Clicks thru

yytg1-Jan-09 3:35

yytg

1-Jan-09 3:35

How do you create a window so when someone clicks on it the click event go to the window under it? (not the parent)

thanks in advance

Re: UnClickable window... Clicks thru

Christopher W. Smith1-Jan-09 9:58

Christopher W. Smith

1-Jan-09 9:58

What do you mean by "the window under it"? Do you mean in the z-order, or perhaps the window that created the current window??? "the window under it" could be any window.

Whichever window you mean, it's pretty easy to notify another window of an event in the current window.

First add a WM_LBUTTONDOWN handler to both windows. (http://msdn.microsoft.com/en-us/library/ms645607(VS.85).aspx[^])

in the window class header files under DECLARE_MESSAGE_MAP()

afx_msg void OnLButtonDown(UINT nFlags, CPoint point);

in the window class source file for the window being clicked:

...
//pass the message on to another window...
void CMyWnd::OnLButtonDown(UINT nFlags, CPoint point)
{
    m_NotifyWnd.SendMessage(WM_LBUTTONDOWN);
}
...
//under BEGIN_MESSAGE_MAP
    ON_WM_LBUTTONDOWN()
...

where m_NotifyWnd is whatever window you want to notify of the click.

Also remember to add the message map for the window receiving the notification.

I did not preserve wparam and lparam across the SendMessage call, you will probably want to read up on the message (link above) and finish the code with the wparam and lparam arguments.

Insofar as finding the correct window to notify, I direct you to the following CWnd member functions to check out (since I'm not quite sure what you're looking for):

CWnd::GetParent[^]

CWnd::GetOwner[^]

CWnd::GetParentOwner[^]

Additionally you can create a member of your class to store a pointer or reference to some other window to notify.

Hope that helps Smile | :)

Chris Smith

Re: UnClickable window... Clicks thru

aks.1-Jan-09 17:55

aks.

1-Jan-09 17:55

Create a layared window. For more pls check SetLayeredWindowAttributes() in MSDN for how to create a layared window.
Then set the Transparent property( WS_EX_TRANSPARENT ) for the dialog.

Now the messages to the layared wnidow will be transferred to the window underlying it.

aks

Re: UnClickable window... Clicks thru

yytg1-Jan-09 20:15

yytg

1-Jan-09 20:15

Thanks

Breaking infinite loop.

Evgeni571-Jan-09 1:47

Evgeni57

1-Jan-09 1:47

Hi,
I need to break the infinite loop by pressing some key, 'x' for example.
How can I do it in C or C++ for console application?

Thanks.

Re: Breaking infinite loop. [modified]

Jijo.Raj1-Jan-09 3:18

Jijo.Raj

1-Jan-09 3:18

Could you please explain what you are trying archive? Do you want to check whether the 'x' key is pressed, in between your loop? In that case check this - Non-Blocking input in Console Applications[^].

Just ignore my reply. Mark's idea is cool! Big Grin | :-D

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

modified on Thursday, January 1, 2009 2:13 PM

Re: Breaking infinite loop.

Mark Salsbery1-Jan-09 7:38

Mark Salsbery

1-Jan-09 7:38

Just one way...

#include <conio.h>
...
    int ch = 0;
    do
    {
        // ...do something useful...

        if (_kbhit())
        {
            ch = _getch();
            ch = toupper(ch);
        }
    }  while (ch != 'X');

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: Breaking infinite loop.

Jijo.Raj1-Jan-09 9:54

Jijo.Raj

1-Jan-09 9:54

Mark, the _kbhit() is really cool and my 5 points for you! Smile | :)

I was totally focused on "non-blocking input in C++" while searching. Sigh | :sigh:

Regards,
Jijo.

_____________________________________________________

http://weseetips.com[^] Visual C++ tips and tricks. Updated daily.

Re: Breaking infinite loop.

Mark Salsbery1-Jan-09 18:59

Mark Salsbery

1-Jan-09 18:59

Heh thanks. I thought for sure there was a single non-blocking function, but I only seem to be able
to find it when I WANT the blocking function and I forget what it is Big Grin | :-D

If anyone knows, please refresh my memory Smile | :)

Cheers,
Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Width of List Column Header Not to be Zero.

Le@rner1-Jan-09 1:11

Le@rner

1-Jan-09 1:11

Hi all,

I m using a Report View type CListCtrl.
i m able to compress width of list column header with using of mouse.and now this is disappear.

so i want even if i drag the column the width of column not to be zero.like GridControls.
here width of column not to be zero whether we drag the column.

please tell me how can i do this.

thanks in advance.

IN A DAY, WHEN YOU DON'T COME ACROSS ANY PROBLEMS - YOU CAN BE SURE THAT YOU ARE TRAVELLING IN A WRONG PATH

Re: Width of List Column Header Not to be Zero.

aks.1-Jan-09 18:13

aks.

1-Jan-09 18:13

You have to derive a class from CListCtrl ( eg: CListCtrlEx ).
Override the CListCtrl::OnNotify() function.

BOOL CListCtrlEx::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult)
{
HD_NOTIFY *pHDN = (HD_NOTIFY*)lParam;
if((pHDN->hdr.code == HDN_ITEMCHANGINGW ||
pHDN->hdr.code == HDN_ITEMCHANGINGA)&&
pHDN->pitem->cxy < minWidth )
{
// If the compress width of list column header is less than the <minwidth> then return
*pResult = TRUE;
return TRUE;
}
return CListCtrl::OnNotify(wParam, lParam, pResult);
}

If you want each column to have different minwidth then you have to check the pHDN->iItem also.

aks

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