C / C++ / MFC Discussion Boards

Re: Getting a bit frustrated with Readfile/Writefile

Michael Dunn1-Mar-05 1:42

1-Mar-05 1:42

YttriumOxide wrote:
What ends up happening is that I get 256bytes of what appears to be random garbage written in to the file

What are you expecting to see in the image file? The first sector (512 bytes) of the disk is the boot sector, which has mostly machine language code.

--Mike--
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Re: Getting a bit frustrated with Readfile/Writefile

User 13768001-Mar-05 8:32

User 1376800

1-Mar-05 8:32

I'm aware of that... but what I'm getting really is garbage - not the first 256bytes of the disk (which as you quite rightly point out is the first 256bytes of the bootsector).

Changing colours of a combo box (reposted)

Alton Williams28-Feb-05 22:31

Alton Williams

28-Feb-05 22:31

Hi,

I've subclassed CComboBox. I've setup the background and text colours called Invalidate(). Which works perfectly well with the edit box. It's when I dropdown it's crashing the app. I want to able to change the colour of the listbox part as well.

Here's the code snippet:

<br />
BEGIN_MESSAGE_MAP(CComboEx, CComboBox)<br />
	//{{AFX_MSG_MAP(CComboEx)<br />
	ON_WM_CTLCOLOR_REFLECT()<br />
	ON_WM_CTLCOLOR()<br />
	//}}AFX_MSG_MAP<br />
END_MESSAGE_MAP()<br />
<br />
/////////////////////////////////////////////////////////////////////////////<br />
// CComboEx message handlers<br />
<br />
HBRUSH CComboEx::CtlColor(CDC* pDC, UINT nCtlColor) <br />
{<br />
	// TODO: Change any attributes of the DC here<br />
	<br />
/*	// TODO: Return a non-NULL brush if the parent's handler should not be called<br />
	if(nCtlColor = CTLCOLOR_LISTBOX)<br />
	{<br />
		return OnCtlColor(pDC,this,nCtlColor);<br />
	}<br />
*/	<br />
	pDC->SetTextColor(m_Text);<br />
	pDC->SetBkColor(m_Background);<br />
	pDC->SetBkMode(TRANSPARENT);<br />
	m_brush.DeleteObject();<br />
	m_brush.CreateSolidBrush(m_Background);<br />
	return m_brush;<br />
}<br />
<br />
HBRUSH CComboEx::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor) <br />
{<br />
	HBRUSH hbr = CComboBox::OnCtlColor(pDC, pWnd, nCtlColor);<br />
	<br />
	return hbr;<br />
}<br />
<br />

Thanks in advance,
Alton

How to get the full Path from GetDisplayName

Lonely Byte28-Feb-05 22:08

Lonely Byte

28-Feb-05 22:08

I need some help with the function CRecentFileList::GetDisplayName.

How did I get the full Path back from this function?

Although the full Path is stored in the Registry I always retrieve the shortened Path like
"D:\MyProgramm\DirLevel1\...\DirLevel4".

Could someone give me a hint on that please?
Thanks

Re: How to get the full Path from GetDisplayName

Ravi Bhavnani1-Mar-05 4:32

Ravi Bhavnani

1-Mar-05 4:32

How about just using the [][^] operator?

/ravi

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Re: How to get the full Path from GetDisplayName

Lonely Byte1-Mar-05 19:40

Lonely Byte

1-Mar-05 19:40

Thanks ravi.

That was a really good hint. Big Grin | :-D

Now I use

csDir = (*m_pRecentFileList)[nMRUIndex];

instead of my first try

m_pRecentFileList->GetDisplayName(csDir,nMRUIndex,"",0,true);

and it works fine.

How to manipulate bitmap in a View?

kokehqyu28-Feb-05 20:38

kokehqyu

28-Feb-05 20:38

By now I can generate some dib bitmap in a MDI application dynamic, so there are many bitmap in a view.In one hand,I need to manipulate these bitmap by the mouse, for example, drag a bitmap to somewhere else, or enlarge a bitmap by drag a bitmap's edge and so on.Another hand, I also need to manipulate these bitmap in while,such as printing the whole view.
What should do?
I think I need define a new view class or control which can contain and display one bitmap.then I only need the manipulate the view class or control. Big Grin | :-D

andy

Re: How to manipulate bitmap in a View?

Selvam R28-Feb-05 22:29

Selvam R

28-Feb-05 22:29

Hi,

http://www.codeproject.com/bitmap/cximage.asp[^]

Thanks and Regards,
Selvam,
http://www15.brinkster.com/selvamselvam/

Re: How to manipulate bitmap in a View?

kokehqyu1-Mar-05 13:50

kokehqyu

1-Mar-05 13:50

thank you, Selvam. Big Grin | :-D

andy

Initially visible dialog box

Kapgan28-Feb-05 20:16

Kapgan

28-Feb-05 20:16

How do I make my dialog box initially visible with MFC?

Re: Initially visible dialog box

zhang80060528-Feb-05 20:47

zhang800605

28-Feb-05 20:47

say detailedly .

CDialog dlg;
dlg.DoModal() ??

Re: Initially visible dialog box

Kapgan1-Mar-05 0:24

Kapgan

1-Mar-05 0:24

I had tried that. Actually I want to use the dialog box as a toolbar, that is why i want it visible. I have .cpp and .h files for the toolbar class derived from CDialog. I included the .h file in MainFrm.cpp. I also have CToolBarNew m_wndToolBarNew; in the protected section ofCMainFrame class. But it still gives compiler error: missing storage-class or type specifiers

Re: Initially visible dialog box

Ed K1-Mar-05 10:58

Ed K

1-Mar-05 10:58

Kapgan wrote:
I included the .h file in MainFrm.cpp.

Put it in the MainFrm.h file.

Why aren't you extending CToolBar?

ed

~"Watch your thoughts; they become your words. Watch your words they become your actions.
Watch your actions; they become your habits. Watch your habits; they become your character.
Watch your character; it becomes your destiny."
- -Uknown.

UDP transfer

Raghav SR28-Feb-05 19:21

Raghav SR

28-Feb-05 19:21

What is the simplest way to create a socket for UDP transfer

Re: UDP transfer

Alexander ^M.,1-Mar-05 5:14

Alexander ^M.,

1-Mar-05 5:14

The "simplest" way is to search codeproject instead of asking here!

Don't try it, just do it! Wink | ;-)

Media Gateway's in VoIP

Raghav SR28-Feb-05 19:18

Raghav SR

28-Feb-05 19:18

How to implement the concept of Media Gateways in VoIP.
What are the values for parameters of the socket() function in VC++ to send RTP datagrams.

on using SSL components

ppp00128-Feb-05 15:58

ppp001

28-Feb-05 15:58

Hi all,

I am currently evaluating SSL components from IPWorks to
implement https protocol for client-server communication.
But it is a bit expensive, do anyone have any experience on using it
or are there any other cheaper component for SSL communication ?

Thanks

Re: on using SSL components

valikac28-Feb-05 18:52

valikac

28-Feb-05 18:52

Check out OpenSSL.

Kuphryn

Re: on using SSL components

Ed K2-Mar-05 4:53

Ed K

2-Mar-05 4:53

MS XML Core[^]

ed

~"Watch your thoughts; they become your words. Watch your words they become your actions.
Watch your actions; they become your habits. Watch your habits; they become your character.
Watch your character; it becomes your destiny."
- -Uknown.

Skinning menus and undoc'd menu msgs

Ron Waller28-Feb-05 11:58

Ron Waller

28-Feb-05 11:58

I was wondering if any has info on the undocumented menu control messages, similar to the button messages: BM_CLICK, etc.

I found a really simple way to subclass the menu by changing its windows-class wnd proc.

First create an invisible menu window with the class name of "#32768" called from the CMainFrame's OnCreate, using it as a parent:

hwnd = CreateWindow( "#32768", "", WS_CHILD, 0,0,10,10,
pParent->m_hWnd, (HMENU) 0, AfxGetInstanceHandle(), &cs );

Then replace the window-class wnd proc with your own:

s_OldWindowProc = (WNDPROC) SetClassLong( hwnd,
GCL_WNDPROC, (DWORD) WindowProc );

Then destroy the window because you don't need it anymore - all menus in your app have the same class wnd proc.

In your "WindowProc" you send all the messages to the orginal class proc using CallWindowProc().

Here are the messages and what they seem to do:

0x000001E5: -Draw mouseover item and send statusbar msg.
0x000001EF: -Send out the command msg
0x000001E4: -End of popup menu
0x000001ED: -Process lbuttondown, draw pressed item, send statusbar msg
0x000001EB: -Handles when to send the command and terminate the popup

Now I think I have enough to override all the drawing so I can replace it with my own, while maintaining full menu functionality, even though I have to use LockWindowsUpdate() to prevent drawing on 0x01E5 and 0x01ED, while calling the orginal proc.

But it would be great to get the message names and the info they have in the Params, which would make skinning the menus a lot easier. Any help or info on where I can this information would be greatly appreciated.

BTW, thanks to .dan.g. and his orignal article on the subject for a lot of the information: http://www.codeproject.com/menu/skinmenu.asp

Unix file locking

Madmaximus28-Feb-05 11:29

Madmaximus

28-Feb-05 11:29

Hi All,

Looking for a way to dynamically control the lock and unlock a file between processes on a Unix machine using C++. Is it best to use the POSIX resource control?

Thanks in advance.
Ken

Win98 system sometimes hangs on ExitWindowsEx()

Still learning how to code28-Feb-05 11:08

Still learning how to code

28-Feb-05 11:08

I have a program which shuts a system down with the following:-

rc = ExitWindowsEx(EWX_SHUTDOWN | EWX_FORCE, 0);
pApp->LogString("Completed shutdown");
if (!rc)
dwError = GetLastError();

I suppose about half the time, this code operates on the Win98 system without a problem and shuts down O.K. However, on other occasions it hangs. Is this a known problem with Win98 ?? - I believe the O/S is up to date. Any ideas would be appreciated ! Confused | :confused:

Doug

Re: Win98 system sometimes hangs on ExitWindowsEx()

PJ Arends28-Feb-05 11:20

PJ Arends

28-Feb-05 11:20

From the MSDN docs on ExitWindowsEx

[quote]
EWX_FORCE Forces processes to terminate. When this flag is set, the system does not send the WM_QUERYENDSESSION and WM_ENDSESSION messages. This can cause the applications to lose data. Therefore, you should only use this flag in an emergency.

Windows 95/98/Me: Because of the design of the shell, calling ExitWindowsEx with EWX_FORCE fails to completely log off the user (the system terminates the applications and displays the Enter Windows Password dialog box, however, the user's desktop remains.) To log off the user forcibly, terminate the Explorer process before calling ExitWindowsEx with EWX_LOGOFF and EWX_FORCE.
[/quote]

Drop the EWX_FORCE flag.

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Re: Win98 system sometimes hangs on ExitWindowsEx()

Still learning how to code28-Feb-05 21:00

Still learning how to code

28-Feb-05 21:00

Thanks for the response - I had already seen the quoted text but, at the time, decided that (within my usage) there was no "data" to be lost. It's some time since I tried it without the EWX_FORCE flag so the following may be entirely wrong, but I've got a feeling I end up with the "Enter Windows Password dialog box, and I didn't know how to "terminate the explorer process". Can you explain how I would go about that ? Incidently (and I forgot to post this originally), when the shut down DOES fail/hang, there is just a desktop background without any icons, taskbar, etc. Anyhow, I'll try it again without the EWX_FORCE flag to refresh my memory ! Appreciate any help with the termination of the Windows Password dialog though !

Doug

Re: Win98 system sometimes hangs on ExitWindowsEx()

Still learning how to code1-Mar-05 10:00

Still learning how to code

1-Mar-05 10:00

I have now removed the EWX_FORCE flag and, on this occasion, no 'hang' occured. However the problem (without use of the flag)is when there is a network connection - during the shutdown process, a dialog appears stating that 'n' users are connected and proceeding will cause their disconnection; the dialog ultimately requests confirmation that shutdown should continue. How do I avoid this dialog without using the EWX_FORCE flag (assuming that that is the cause of the 'hang' during shutdown) Thanks in advance for any help on this !

Doug

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