C / C++ / MFC

Re: How to read USB type Disk Drive device?

6-Mar-12 17:53

And then what did GetLastError() return?

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Le@rner12-Mar-12 20:41

Le@rner

12-Mar-12 20:41

GetLastError return "0x00000456 The media in the drive may have changed. "

Re: How to read USB type Disk Drive device?

David Crow13-Mar-12 3:18

create statusBar in dialog problem

13-Mar-12 3:18

Does this happen after the system comes out of Standby mode?

appollosputnik29-Feb-12 15:31

appollosputnik

29-Feb-12 15:31

I am trying to create a statusBar in the dialog but it's returning false. not creating the status bar please tell me whats going wrong in this. Thanks for any help. I am creating the status bar in the OnInitDialog() function

[code]

CStatusBar m_wndStatusBar; // member variable in the dialog header.

BOOL CDlgsViewDlg::OnInitDialog()
{
CDialog::OnInitDialog();
if (!m_wndStatusBar.Create(this) ||
!m_wndStatusBar.SetIndicators(indicators,
sizeof(indicators)/sizeof(UINT)))
{
TRACE0("Failed to create status bar\n");
return FALSE; // fail to create
}

m_wndStatusBar.SetPaneText(0,L"MainWindow Initialized");
}
[/code]

it's returning false. please help me.

Re: create statusBar in dialog problem

chenxi_129-Feb-12 18:00

chenxi_1

29-Feb-12 18:00

see http://www.cppblog.com/besterChen/archive/2009/04/03/78846.html[^]
Language： chs

Re: create statusBar in dialog problem

Chandrakantt29-Feb-12 18:53

Chandrakantt

29-Feb-12 18:53

You can create status bar by calling

m_wndStatusBar.Create(WS_CHILD|WS_VISIBLE|SBT_OWNERDRAW,
    CRect(0,0,0,0), this, 0);

You can have a look at Toolbar & StatusBar on Dialog[^]

Re: create statusBar in dialog problem

appollosputnik1-Mar-12 0:19

appollosputnik

1-Mar-12 0:19

thanks a lot it's working now.

Menu items disabled but appear enabled

cpp_prgmer29-Feb-12 9:27

29-Feb-12 9:27

I am disabling some menu items based on a condition but after some dialog launch in the application, these menu item appearance changes to those of enabled.
However, when I click them their appearance changes to that of a disabled button. I can also do this by simply switching focus or simply by minimize-restore of application.
Why does the menu item change appearance? How can I prevent that from happening?

David Crow29-Feb-12 9:56

29-Feb-12 9:56

Is this an MFC application? How are you disabling the menu items? From where, and how, are you launching the dialog box?

cpp_prgmer29-Feb-12 10:56

29-Feb-12 10:56

Yes this is a MFC application which works similar to the CProperty sheet wizard style but with CDialogs.
I am disabling the menu items in the frame class when the first dialog appears at start of the application but somewhere in between when other dialogs come up the appearance of the disabled menu items is changing from disabled to enabled.

Maximilien29-Feb-12 13:57

Maximilien

29-Feb-12 13:57

To enable/disable menu items it is best practice to use the ON_UPDATE_COMMAND_UI message.

It also best practice to use a SDI (with a CFormView) application if menus are needed.

Watched code never compiles.

cpp_prgmer1-Mar-12 3:56

1-Mar-12 3:56

Thanks for your advice. But turns out if you try to disable the menubar items after system creates window, you need to call DrawMenuBar().
Source of explanation: http://stackoverflow.com/questions/1835209/how-can-i-disable-and-gray-the-top-level-menu-item-using-mfc?answertab=oldest#tab-top[^]
This solves my problem... Hope this helps anyone else having similar issues.

Randor 29-Feb-12 17:47

Randor

29-Feb-12 17:47

Hi,

It sounds to me as if your doing something that is screwing up the MFC command routing. However based on your brief description I have no ideas as to what it could be. Did you check to see if the menu items have a unique resource ID?

Best Wishes,
-David Delaune

rana ray1-Mar-12 5:46

rana ray

1-Mar-12 5:46

Is it solved now?

regards
Vatsa
www.objectiveprogramming.com[^]

cpp_prgmer1-Mar-12 14:37

1-Mar-12 14:37

Yes my problem is solved. As replied earlier calling DrawMenuBar()solved my issue. Please refer to: http://stackoverflow.com/questions/1835209/how-can-i-disable-and-gray-the-top-level-menu-item-using-mfc[^]
for more details.

Randor 2-Mar-12 17:54

Randor

2-Mar-12 17:54

Hi,

I see that you showed your EnableMenuItem() function on stackoverflow. If you would have gave us a better description and shown that function here on codeproject you would have recieved a much better response.

Best Wishes,
-David Delaune

cpp_prgmer3-Mar-12 6:10

A C PROGRAM to extract a bit or a group of bits from a Ethernet frame

3-Mar-12 6:10

Sorry for the confusion, let me explain. The StackOverflow post was not me, it was a reference. I could not post my code online... Company policy. However, thanks for your concern in trying to help me solve my problem. I shall continue to approach you guys in future.

prathapkumar33429-Feb-12 4:05

prathapkumar334

29-Feb-12 4:05

I am doing a project in college in which i have to extract a bit or a group of bits from a Ethernet frame in C PROGRAMMING. Can someone please provide an example in writing the code? Thank you.

Pavan

Re: A C PROGRAM to extract a bit or a group of bits from a Ethernet frame

David Crow29-Feb-12 4:36