Re: Scrolling - C / C++ / MFC Discussion Boards

31-Mar-02 9:28

I have a OnEraseBkgnd() function to change the background colour of my MDI app's frame window to a nice blue colour rather than boring grey... but every permutation of my attempts to do so don't work..

Can somebody please tell me the correct code for changing the background? I have this so far, but does not work:

BOOL CMainFrame::OnEraseBkgnd(CDC* pDC)
{
// Paint it a nice colour.
CBrush backBrush(0x00755121);
// Save old brush.
CBrush* pOldBrush = pDC->SelectObject(&backBrush);
CRect rcRect;
pDC->GetClipBox(&rcRect); // Erase the area needed.
pDC->PatBlt(rcRect.left, rcRect.top, rcRect.Width(), rcRect.Height(), PATCOPY);
pDC->SelectObject(pOldBrush);

return TRUE;
}

Thanks

Re: Quick newbie question

Christian Graus31-Mar-02 12:32

Christian Graus

31-Mar-02 12:32

I believe the problem is that you need to do this elsewhere to get the background of an MDI app. I forget exactly where, but my recollection is an article on this was posted recently.

Christian

The tragedy of cyberspace - that so much can travel so far, and yet mean so little.

"I'm somewhat suspicious of STL though. My (test,experimental) program worked first time. Whats that all about??!?!
- Jon Hulatt, 22/3/2002

Re: Quick newbie question

Paul M Watt31-Mar-02 15:38

Paul M Watt

31-Mar-02 15:38

Your code is correct for painting over a background. However the reason that it does not appear is because your MDI frame window, contains an MDI client window. This is where you will need to handle the erase background message.

You will have to sub class that window in order to handle that message. The MDI frame provides a variable m_hWndMDIClient that represents that handle of that window.

Re: Quick newbie question

Mazdak1-Apr-02 0:22

Mazdak

1-Apr-02 0:22

This is what you want:

http://www.codeproject.com/useritems/MDIBackgroundImage.asp

Mazy

"So,so you think you can tell,
Heaven from Hell,
Blue skies from pain,...
How I wish,how I wish you were here."
Wish You Were Here-Pink Floyd-1975

WinXP symbols - VC does not find them

Lockhart31-Mar-02 9:27

Lockhart

31-Mar-02 9:27

I've Windows XP, VC + SP5

I've installed (windowsxp.x86.fre.rtm.symbols.exe) but when I debug my application still they are not found:

[...]
Loaded 'C:\WINDOWS\system32\ole32.dll', no matching symbolic information found.
[...]

But "C:\WINDOWS\SYMBOLS\DLL\ole32.pdb" exists, it's been installed by the exe above.

I heard about a problem with 'pdb' files and about some changes to do in the registry under DevStudio but I don't remember more Frown | :(

Any help?

Thanks in advance.

Re: WinXP symbols - VC does not find them

Tim Smith31-Mar-02 11:55

Tim Smith

31-Mar-02 11:55

Chances are you have applied a OS patch the XP and the OLE32.PDB doesn't match the DLL anymore.

Tim Smith

I know what you're thinking punk, you're thinking did he spell check this document? Well, to tell you the truth I kinda forgot myself in all this excitement. But being this here's CodeProject, the most powerful forums in the world and would blow your head clean off, you've got to ask yourself one question, Do I feel lucky? Well do ya punk?

Scrolling

31-Mar-02 9:21

Hi,

I was wondering how you would do a proper scrolling in a CScrollView
when you perform search and find and highlighting for characters? I mean there are ways to force the vertical scrollbar to move up and down, but how
do you make sure that it moves up and down only when it's necessary
(only when the item is outside of the current screen)?

Re: Scrolling

alex.barylski31-Mar-02 22:11

alex.barylski

31-Mar-02 22:11

CRect rcClient;

GetClientRect(&rcClient);

TEXTMETRICS tm;
CDC* pDC = CDC::FromHandle(::GetDC(this->m_hWnd));
pDC->GetTextMetrics(&tm);

int nLineHeight = tm.tmHeight (I think) + tm.tmAscent; (i think)

The above code would work on constant font size, but you would have to figure something else out if you have graphics and such or font's of different sizes.

Basically once you have individual line height and client area figured out, you would need to determine which line the word (found) was located.

int iLine = Search("Test");  //psuedo function

Now that you have the line index:

int nSpace = iLine * nLineHeight;

nSpace is the number of pixels all the lines up to the current indexed line consume.

By having this value and having you current viewing area(client rect) you could subtract client area by line height(s) and determine if the text is out of the viewing area and requires scrolling.

if(nSpace >= rcClient.bottom) //Requires scrolling
{
  //...Calculate required scrolling distance
  //...Set scrollbar(s) to calculated offset
}
else
  AfxMessageBox("Don't scroll...Text is within current area");

I'm missing a few thing i'm sure, but from the above you should get the gist of things and be able to take it one step further.

Cheers! Smile | :)

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

Time trial?

Edilson Vasconcelos de Melo Junior31-Mar-02 9:11

Edilson Vasconcelos de Melo Junior

31-Mar-02 9:11

Hi,
Is there any classes or ActiveX control that can make my appl time trial? And what about adware?

Thank u very much,
Dirso.

Re: Time trial?

Christian Graus31-Mar-02 12:35

Christian Graus

31-Mar-02 12:35

This stuff is easy to do and the only solution is to roll your own. I mean, if a common class exists to do a time trial, doesn't that mean by figuring out how to break it, someone can in one stroke crack every program that uses it ?

Christian

The tragedy of cyberspace - that so much can travel so far, and yet mean so little.

"I'm somewhat suspicious of STL though. My (test,experimental) program worked first time. Whats that all about??!?!
- Jon Hulatt, 22/3/2002

Re: Time trial?

Nish Nishant31-Mar-02 14:13

Nish Nishant

31-Mar-02 14:13

CExpire - A C++ class that implements time and run based restrictions
Shareware authors can use this class to limit the number of runs or the number of days that a program will function

Has anyone seen my sig?

Re: Time trial?

Christian Graus31-Mar-02 14:45

Christian Graus

31-Mar-02 14:45

Have you seen the guys photo on that artice ? Would you trust someone who looks like that to write code for - oh, sorry, Nish ..... :P :P :P :P :P :P :P

Christian

The tragedy of cyberspace - that so much can travel so far, and yet mean so little.

"I'm somewhat suspicious of STL though. My (test,experimental) program worked first time. Whats that all about??!?!
- Jon Hulatt, 22/3/2002

Re: Time trial?

Nish Nishant31-Mar-02 15:07

Nish Nishant

31-Mar-02 15:07

Christian Graus wrote:
Have you seen the guys photo on that artice ? Would you trust someone who looks like that to write code for - oh, sorry, Nish .....

Yeah, you'd have thought he was a model or a film actor going by his good looks eh?

Nish

Make MSDN universal, FREE!

Re: Time trial?

Christian Graus31-Mar-02 15:19

Christian Graus

31-Mar-02 15:19

Yeah - that's what I meant. Always hard to take those good looking people seriously.

Christian

The tragedy of cyberspace - that so much can travel so far, and yet mean so little.

"I'm somewhat suspicious of STL though. My (test,experimental) program worked first time. Whats that all about??!?!
- Jon Hulatt, 22/3/2002

Re: Time trial?

Edilson Vasconcelos de Melo Junior1-Apr-02 2:52

Edilson Vasconcelos de Melo Junior

1-Apr-02 2:52

Thank u very much!!!!! Ur work is really GREAT!!!! It's not a 5 it's a BIG 1000!!!

Dirso

Re: Time trial?

Nish Nishant1-Apr-02 16:11

Nish Nishant

1-Apr-02 16:11

Edilson Vasconcelos de Melo Junior wrote:
Thank u very much!!!!! Ur work is really GREAT!!!! It's not a 5 it's a BIG 1000!!!

Glad to be of assistance Smile | :)

Nish

Make MSDN universal, FREE!

Edit box balloon tips in WinXP

sultan_of_6string31-Mar-02 8:08

sultan_of_6string

31-Mar-02 8:08

This is pissing me off big time. I have an edit box in a dialog and want to show a balloon tip as soon as the dialog is open:

BOOL Welcome_OnInitDialog(HWND hDlg, HWND hWndFocus, LPARAM lParam)
{
	// Display the music folder (as saved in the registry)
	SetDlgItemText(hDlg, IDC_MUSIC_FOLDER, g_musicFolder);
	
	WCHAR szTitle[] = L"Music Folder";
	WCHAR szText[] = L"Enter the path to your music folder here, or click browse..";
	EDITBALLOONTIP ebt;
	ebt.cbStruct = sizeof(ebt);
	ebt.pszTitle = szTitle;
	ebt.pszText = szText;
	ebt.ttiIcon = TTI_INFO;
	Edit_ShowBalloonTip(GetDlgItem(hDlg, IDC_MUSIC_FOLDER), &ebt);

	return TRUE;
}

It is not working. Yet, when the user clicks the OK button. My WM_COMMAND hander has no problem displaying balloon tip:

void Welcome_OnCommand(HWND hDlg, int nId, HWND hWndCtrl, UINT uCodeNotify)
{
	HWND hMusicFolder = GetDlgItem(hDlg, IDC_MUSIC_FOLDER);

	if (nId == IDOK)
	{
		g_musicFolder.GetFromHWnd(hMusicFolder);
		DWORD dwFileAttributes = GetFileAttributes(g_musicFolder);
		if (dwFileAttributes == 0xffffffff || dwFileAttributes &
			FILE_ATTRIBUTE_DIRECTORY != FILE_ATTRIBUTE_DIRECTORY)
		{
			// Select the text in the text box.
			SendMessage(hMusicFolder, EM_SETSEL, 0, -1);
			// Display a balloon tip.
			WCHAR szTitle[] = L"Invalid folder name";
			WCHAR szText[] = L"Please confirm that this is the path to your music folder.";
			EDITBALLOONTIP ebt;
			ebt.cbStruct = sizeof(ebt);
			ebt.pszTitle = szTitle;
			ebt.pszText = szText;
			ebt.ttiIcon = TTI_WARNING;
			Edit_ShowBalloonTip(hMusicFolder, &ebt);
			
			return;
		}
.
.
.
}

What's going on? Any fixes?

Thanks

Re: Edit box balloon tips in WinXP

Ravi Bhavnani31-Mar-02 9:11

Ravi Bhavnani

31-Mar-02 9:11

The dialog may not have finished initializing until OnInitDialog(). Try setting up the balloon tip within a handler for a fake command (I use IDC_INIT_GUI). Post the command (using PostMessage (WM_COMMAND, IDC_INIT_GUI)) from within OnInitDialog() to ensure that the handler will be executed after the dialog has initialized itself.

/ravi

"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com

Test

31-Mar-02 3:18