C / C++ / MFC

Re: How to include a library file?

23-Mar-07 4:56

Thanks I get it now.

286? WOWW! Blush | :O

Nibu babu thomas25-Mar-07 17:13

Nibu babu thomas

25-Mar-07 17:13

_8086 wrote:
Thanks I get it now.

Really !

Nibu thomas
A Developer

Programming tips[^] My site[^]

Scrolling Text problem

vinhcyim23-Mar-07 0:13

vinhcyim

23-Mar-07 0:13

Dear,
I am trying to create a MFC program to scroll some text.
I have already used the double buffering technology, however, there is still some flicker...
I want to do one without any flicker.
Is anyone who can help me???
Thanks a lot.
Here is my code

struct News
{
CString strNews;
int pos;
int initpos;
BOOL bDecrease;
};
CList<news*,news*> m_News;

void CTextScroller::OnTimer(UINT in)
{
if(in == 0)
{
CClientDC dc(this);
CRect rectClient;
GetClientRect(&rectClient);
MoveTextToLeft(&dc, rectClient);
}
CStatic::OnTimer(in);
}

void CTextScroller::MoveTextToLeft(CDC* pDC, CRect& r)
{
int count = m_News.GetCount();
if(!count)
return;

CDC memDC;
memDC.CreateCompatibleDC(pDC);

if(m_BmpMain.m_hObject == NULL)
{
m_BmpMain.CreateCompatibleBitmap( pDC, r.Width(), r.Height() );
}

memDC.SelectObject(&m_BmpMain);
memDC.SelectObject(&m_font);
memDC.SetBkMode(TRANSPARENT);
memDC.SetTextColor(m_TextColor);

News *_news = NULL;
CSize size;
POSITION pos = m_News.GetHeadPosition();

memDC.FillSolidRect(&r,m_BkColor);

while(pos)
{
_news = m_News.GetNext(pos);
if(!_news)
return;
size = memDC.GetTextExtent(_news->strNews);
if(_news->bDecrease)
_news->pos--;
if(_news->pos < r.left - size.cx)
continue;

//memDC.DrawText(_news->strNews,CRect(_news->pos, 0, _news->pos + size.cx, size.cy),DT_LEFT);
memDC.TextOutW(_news->pos, 0, _news->strNews);
}

pDC->BitBlt(0, 0, r.Width(), r.Height(), &memDC, 0, 0, SRCCOPY);
}

posting guidelines

toxcct23-Mar-07 0:16

toxcct

23-Mar-07 0:16

please read this[^] and edit your message to use <pre></pre> tags when posting code

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Re: Scrolling Text problem

Mark Salsbery23-Mar-07 8:21

Mark Salsbery

23-Mar-07 8:21

As toxcct mentioned, please reformat your post so we can read your code without our eyes
bleeding Smile | :)

You shouldn't be getting any flicker unless maybe the window you're blitting to is redrawing
its background.

You're using double buffering so there's no need to set the BkMode of the memory DC to
TRANSPARENT.

Also, a possibly simpler solution is to use ScrollWindowEx to scroll a windows contents and then
only the newly exposed portion of the window needs to be repainted. No flicker and no double
buffering required Smile | :)

Mark

"If you can dodge a wrench, you can dodge a ball."

SDI/ View

_808623-Mar-07 0:10

23-Mar-07 0:10

I'm standing right here:

CString cs;
void CNotePadApp::OnFileOpen()
{
// I've a string here... may be "cs". How do I send this to CNotePadView::OnDraw(CDC* pDc)?
// So that it gets displayed. Please help.
}

void CNotePadView::OnDraw(CDC* pDc)
{
CNotePadDoc* pDoc = GetDocument();
pDc->TextOutA(0,0,csText,csText.GetBufferLength());

286? WOWW! Blush | :O

RChin23-Mar-07 2:01

RChin

23-Mar-07 2:01

Well since you are using the Doc/View architecture, the usual practice is to store the string in a member variable of your CDocument derived class (CNotePadDoc??).
This can then be easily accessed from your view.

<br />
void CNotePadApp::OnFileOpen()<br />
{<br />
  CString strText = _T("Some string ");<br />
  CNotPadDoc* pDoc = GetDocument();<br />
 pDoc->SetMyString(strText);<br />
}<br />
<br />
..<br />
void CNotePadView::OnDraw(CDC* pDc)<br />
{<br />
  CString csText;<br />
  CNotePadDoc* pDoc = GetDocument();<br />
<br />
  csText = pDoc->GetMyText();<br />
  pDc->TextOutA(0,0,csText,csText.GetBufferLength());<br />
..<br />

I Dream of Absolute Zero

_808623-Mar-07 0:52

23-Mar-07 0:52

You open a file, using the "open" in the winapp window menu. Now you store the content in a string.. Now, how do you send it to the view. Please note, you are now away from the view class. Where is the view class's object created?
In general the question goes like this:
You are inside a class far away from the view class. How do print a string from the far away class into the view(The client window that's displays content). You get me now?

286? WOWW! Blush | :O

_808623-Mar-07 2:11

23-Mar-07 2:11

Thanks RChin, I'll try that.

286? WOWW! Blush | :O

cp987623-Mar-07 13:47

cp9876

23-Mar-07 13:47

Check out:

Creating New Documents, Windows, and Views[^]

and

TN025[^]

Peter

"Until the invention of the computer, the machine gun was the device that enabled humans to make the most mistakes in the smallest amount of time."

_808624-Mar-07 5:56

24-Mar-07 5:56

Thanks dude!

----------------------------
286? WOWW! Blush | :O

_808624-Mar-07 5:57

24-Mar-07 5:57

Wow!!! Just checked very nice articles! thanks for sharing!

----------------------------
286? WOWW! Blush | :O

strings in c++

pariisa22-Mar-07 23:46

pariisa

22-Mar-07 23:46

hi I want write the code for :
char *strcpy(char *s1 , const char *s2 )?
char *strncpy(char *s1 , const char *s2 , int size)?

char *strcat( char *s1 , const char *s2 )?
char *strncat( char *s1 , const char *s2 , int size )?

int *strcmp( const char *s1 , const char *s2 )?
int *strncmp( const char *s1 , const char *s2 , int size)?

help me please

toxcct22-Mar-07 23:50

toxcct

22-Mar-07 23:50

what's your question exactly ? you want to rewrite thos function ?
what for ?

moreover, if you work with C++ strings, you'd better forget those old char*. they are a legacy from the C language, kept for compatibility.
however, you should use the std::string class instead; which class proposes all the functionnality you want to redevelop here (if i get you well)

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vijay_aroli23-Mar-07 0:08

vijay_aroli

23-Mar-07 0:08

toxcct wrote:
you want to rewrite thos function ?

yes, i think he wants to rewrite those functions. Cool | :cool:

and i also feel its part of an assignment/homework given to him.

Regards,
Vijay.

God may not give us what we 'want', but he surely gives us what we 'need'.

Paresh Chitte22-Mar-07 23:52

Paresh Chitte

22-Mar-07 23:52

What exactly do you want ? Please be specific while posting.

Regards,

Paresh.

C Mahesh23-Mar-07 0:03

C Mahesh

23-Mar-07 0:03

I think you should reffer to some good books on C and C++ (Ex: C and C++ Programmers Bible)