BitBlt not working? - C / C++ / MFC Discussion Boards

Re: Showing memory contents into a HTMLView?

Ravi Bhavnani4-Dec-02 10:38

Ravi Bhavnani

4-Dec-02 10:38

Brilliant! Simply brilliant! You just saved me from writing (and deleting) an ugly temp .htm file. Rose | [Rose]

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Re: Showing memory contents into a HTMLView?

J Patel4-Dec-02 10:47

J Patel

4-Dec-02 10:47

Thanks. But you should be aware of the max URL length that can be passed. I haven't tried this myself but if you look in wininet.h you see the following #defines

#define INTERNET_MAX_PATH_LENGTH 2048
#define INTERNET_MAX_SCHEME_LENGTH 32 // longest protocol name length
#define INTERNET_MAX_URL_LENGTH (INTERNET_MAX_SCHEME_LENGTH \
+ sizeof("://") \
+ INTERNET_MAX_PATH_LENGTH)

I guess as long as your html text doesn't go over the #define you'll be ok.

Jignesh

Re: Showing memory contents into a HTMLView?

Ravi Bhavnani4-Dec-02 11:58

Ravi Bhavnani

4-Dec-02 11:58

Good point. I guess it also pays to urlencode the text before checking its length.

Thanks for making TakeStock[^] less ugly. Smile | :)

/ravi

Let's put "civil" back in "civilization"
http://www.ravib.com
ravib@ravib.com

Re: Showing memory contents into a HTMLView?

Joan M4-Dec-02 20:46

Joan M

4-Dec-02 20:46

Hello,

This can be a great solution, but I don't know how to launch the code to my HTMLCtrl...

I'm using Paul DiLascia's HTMLCtrl (is directly derived from HTMLView), but I need to show the HTML "file" in that control not in a normal IE window.

How do I launch that? Do I need to use a system("about:MyHTMLCode") call?

If I do it in this way I won't be able to redirect MyHTMLCode to my HTMLCtrl because this would fire another instance of IE.

Is there any better way to launch it?

I've tried to pass this to the navigate instruction, but it hasn't worked for me:

<br />
CString a = "";<br />
a.Format("about:%s",csCodiHTML);<br />
this->m_HTMLCtrl.Navigate(a);<br />

could you explain how to do it?

Thank you in advance!

Re: Showing memory contents into a HTMLView?

J Patel5-Dec-02 4:00

J Patel

5-Dec-02 4:00

I tried the above with some simple HTML on a CHTMLView and not the HTMLCtrl (which should work the same though) and it worked.

I can think of two things.

1) I used the Navigate2 method.
2) Is the URL VERY long? See the above threads on limitations.

or you can try what someone else suggested (the atricle on codeguru).
HTH

Jignesh

Re: Showing memory contents into a HTMLView?

David Salter4-Dec-02 12:12

David Salter

4-Dec-02 12:12

Does this help?

http://codeguru.earthweb.com/ieprogram/HtmlMemory.html[^]

Dave.

Control not showing immediately

Brigg Thorp4-Dec-02 1:19

Brigg Thorp

4-Dec-02 1:19

Hello all...

I am having a problem with the animation control on a dialog. In my
WM_INITDIALOG handler, I have the following code:

<br />
case WM_INITDIALOG:<br />
  hAnim = CreateAnimationCtrl(hDlg, IDC_ANIMATE);<br />
  Animate_Play(hAnim, 0, -1, -1); <br />
  RedrawWindow(hDlg, NULL, NULL, RDW_INVALIDATE | RDW_ERASE |<br />
RDW_UPDATENOW | RDW_ALLCHILDREN);<br />
<br />
  RECT rect;<br />
  GetClientRect(hAnim, &rect); <br />
  InvalidateRect(hAnim, &rect, FALSE);<br />
<br />
  SetTimer(hDlg, 1, 350, NULL);<br />
<br />
  etc...<br />

In the timer event, I have the following code:

<br />
case WM_TIMER:<br />
  KillTimer(hDlg, 1);<br />
  SetTimer(hDlg, 1, 20, NULL);<br />
  theMain.m_nErrCode = theMain.m_lpDevice->Communicate(hDlg,<br />
&bPercent, &wPacketCount, szStatus);<br />
<br />
  etc...<br />

As you can see, I am running a communcation routine that is sending
data through the USB port using an HID driver and standard WriteFile
calls. However, when the dialog first loads up, sometimes, not all the
time, the animation will not show up immediately. I'm trying to make a
dialog like the Windows Explorer dialog shown during a long copy
operation. Is there anything that I can do to make sure that the
animation is up before running the communication?

Brigg Thorp
Software Engineer
Timex Corporation

BitBlt not working?

S O S4-Dec-02 0:38

S O S

4-Dec-02 0:38

Using MFC in a MDI program.
The view has no background, so nothing is painted automatically.
I have this BitBlt on the OnDraw function of a view.

CRect r;<br />
pDC->GetClipBox(&r);<br />
<br />
pDC->BitBlt(r.left, r.top, r.Width(), r.Height(), &pDoc->m_map.m_canvas,<br />
		r.left, r.top, SRCCOPY);

But it doesn't seem to do anything! Not a pixel gets painted.
I tried a FillSolidRect too here and that worked fine.

m_canvas is a DC created with CreateCompatibleDC(NULL)
the rect r seems to be correct and the m_canvas seems to be a valid canvas too.
Oh and the BitBlt returns 1, so it's not failing internally it seems...

Re: BitBlt not working?

Christian Graus4-Dec-02 0:43

Christian Graus

4-Dec-02 0:43

What are the values in r ? Are they within the bounds of the dialog ? Of the canvas ? Try making the last parameter WHITENESS and see what you get. ( You should get a white box ).

Christian

No offense, but I don't really want to encourage the creation of another VB developer. - Larry Antram 22 Oct 2002

Hey, at least Logo had, at it's inception, a mechanical turtle. VB has always lacked even that... - Shog9 04-09-2002

Again, you can screw up a C/C++ program just as easily as a VB program. OK, maybe not as easily, but it's certainly doable. - Jamie Nordmeyer - 15-Nov-2002

Re: BitBlt not working?

S O S4-Dec-02 5:22

S O S

4-Dec-02 5:22

The m_canvas should be exactly the size of the drawing area
The values in r seem the right ones needed
WHITENESS works fine

I didn't set the size of m_canvas in any way though. Should I have? And if yes, then with what function? I couldn't find anything that would do that

Re: BitBlt not working?

KaЯl4-Dec-02 5:30

KaЯl

4-Dec-02 5:30

Do you have selected a bitmap object in your "m_canvas" memory DC ?

Ohé Partisans, Ouvriers et Paysans
C'est l'alarme!

Le Chant des Partisans

Re: BitBlt not working?

S O S4-Dec-02 5:50

S O S

4-Dec-02 5:50

No. BitBlt doesn't require anything specific to be selected, does it?

Re: BitBlt not working?

KaЯl4-Dec-02 6:03

KaЯl

4-Dec-02 6:03

Ok, it's here probably the problem, there's no data in you document's object. Memory DCs require a bitmap which is the one with stores the graphical info.

When you create your document DC, create also a compatible bitmap (look at CBitmap::CreateCompatibleBitmap), select it in your memory DC, draw on it then BitBlt on your "device" DC.

Here a sample of the mechanic to use, extracted from a drawing method, with
m_SelectionRect = rectangle used to draw "on memory"
DrawMyObject(CDC *pDC): method which actually draws through pDC
dc: the "device" DC

CDC TempMemDC;<br />
CBitmap *pTempBitmap = new CBitmap();<br />
VERIFY(TempMemDC.CreateCompatibleDC(NULL));<br />
VERIFY(pTempBitmap->CreateCompatibleBitmap(&dc, m_SelectionRect.Width(),<br />
m_SelectionRect.Height())); <br />
CBitmap *pOldBitmap = (CBitmap *) TempMemDC.SelectObject(pTempBitmap); <br />
TempMemDC.BitBlt(0, 0, m_SelectionRect.Width(), m_SelectionRect.Height(), BLACKNESS);<br />
// Draw the module in the MemDC<br />
DrawMyObject(&TempMemDC);<br />
dc.BitBlt(0, 0, m_SelectionRect.Width(), m_SelectionRect.Height(), &TempMemDC, 0, 0, SRCCOPY);<br />
// reselect old bitmap<br />
TempMemDC.SelectObject(pOldBitmap);

HTH,

Ohé Partisans, Ouvriers et Paysans
C'est l'alarme!

Le Chant des Partisans

Re: BitBlt not working?

S O S4-Dec-02 7:46

S O S

4-Dec-02 7:46

Thanks, I think I get it now

Re: BitBlt not working?

KaЯl4-Dec-02 13:35

KaЯl

4-Dec-02 13:35

My pleasure if I may help. And welcome on CP Smile | :)

Ohé Partisans, Ouvriers et Paysans
C'est l'alarme!

Le Chant des Partisans

Repaint slider channel

Neha3-Dec-02 23:46

Neha

3-Dec-02 23:46

Hi,
I have written this to repaint the slider channel:

NMCUSTOMDRAW the_struct;
the_struct.hdr.hwndFrom =m_ProgressSlider.m_hWnd;
the_struct.hdr.idFrom = IDC_PROGRESSSLIDER;

the_struct.hdr.code=NM_CUSTOMDRAW;
the_struct.dwDrawStage = CDDS_ITEMPREPAINT;
the_struct.dwItemSpec =TBCD_CHANNEL;
the_struct.hdc =this->GetDC()->m_hDC;
m_ProgressSlider.GetChannelRect(&the_struct.rc);

SendMessage(WM_NOTIFY ,(WPARAM)IDC_PROGRESSSLIDER,(LPARAM)&the_struct);

But slider is not repainted.Can anyone help me..

Regards

Re: Repaint slider channel

KaЯl3-Dec-02 23:58

KaЯl

3-Dec-02 23:58

You probably have to derive your own slider class to do so.
This article[^] may perhaps help

HTH,

Ohé Partisans, Ouvriers et Paysans
C'est l'alarme!

Le Chant des Partisans

Re: MyListCtrl.SetSelectionMark doesn't call OnItemChangedLCtrl(...)

MFC is the Best4-Dec-02 0:15

MFC is the Best

4-Dec-02 0:15

i don´t know, if i understand you right, because my english is not so good.

if you have a listCtrl in MFC, for example: m_ctrlListBox, then you can add a string to the listbox: m_ctrlListBox.AddString("Hi");
if want to to select this entry you can do something like this:

<br />
m_ctrlList.AddString("Hi");<br />
m_ctrlList.SetCurSel(0);<br />
int place=m_ctrlList.GetCurSel();<br />
CString buffer;<br />
m_ctrlList.GetText(place, buffer);<br />

now the buffer includes the first entry of the listbox.

hope i could help you.
mfc

text from edit to list box

xxhimanshu3-Dec-02 23:21

xxhimanshu

3-Dec-02 23:21

i want to enter my edit box text into a list box. how it can be done? can anyone help..

himanshu

Re: text from edit to list box

Michael P Butler3-Dec-02 23:48

Michael P Butler

3-Dec-02 23:48

Are you using MFC?

CString sString = "";<br />
<br />
// Get edit box value<br />
m_edit.GetWindowText(sString);<br />
<br />
// Add edit box value to list control<br />
m_listbox.AddString(sString);

Michael

Fat bottomed girls
You make the rockin' world go round -- Queen

Re: text from edit to list box

Joan M3-Dec-02 23:54

Joan M

3-Dec-02 23:54

Try this:

<br />
CListBox a;<br />
CString b = "";<br />
<br />
yourEditBox.GetWindowText(&b);<br />
a.AddString(b);<br />

Of course you can change the CString and the GetWindowText(...) for a CString variable linked to your editbox... if you want to do it in this way you must call UpdateData();

hope this helps...

Re: text from edit to list box

xxhimanshu4-Dec-02 0:06

xxhimanshu

4-Dec-02 0:06

thanks a lot.. Smile | :)

Problems with data conversion

Gian3-Dec-02 22:57

Gian

3-Dec-02 22:57

Hi,
i've a problem converting data from a format to another. the function

VARIANT SaveToMemory(const VARIANT& Format, const VARIANT& CurSelection);

returns a byte array (text data) casted like a VARIANT. I need to put this array in a CString variable. So I've used this:

COleVariant varBuffer;
COleVariant mode, cur;
mode = (long)5;
cur = (short)TRUE;
varBuffer = m_txctrl.SaveToMemory(mode, cur);
CString m_text = ((CByteArray &)(varBuffer.pbVal)).GetData();

But this will return an empty string. using CString m_text = (varBuffer.pbVal); return me a single byte.

It's wrong my code?

Re: Problems with data conversion

Hans Ruck4-Dec-02 0:50

Hans Ruck

4-Dec-02 0:50

Gian wrote:
returns a byte array (text data) casted like a VARIANT

Where exactly is that byte array? It can't be pbVal because this one is about one single byte... (check MSDN)

rechi

Re: Problems with data conversion

Gian4-Dec-02 3:02

Gian

4-Dec-02 3:02

i've solved calculating the dimension of the OleVariant and using memcpy to copy data in a CByteArray. now works Smile | :)

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