BitBlt on Win98 / WinNT - C / C++ / MFC Discussion Boards

Yeah, it looks like it works on my "English-speaking" w2k as well.
How annoying is that!

Cheers

Hi all,

I have two application, A.EXE and B.EXE. The two applications communicate using OLE Automation method. A.EXE is the server and B.EXE is the client. Now, I want B.EXE to pass a HWND to A.EXE, and A.EXE will draw image at the given HWND. I can't make it.

CWnd::FromHandlePermanent(hWnd) return NULL.

I would like get advice from codegurus here whether this approach is possible or not. If not, is there any other method to do so?

thanks

regards,
yhtay

> Now, I want B.EXE to pass a HWND to A.EXE, and A.EXE will draw
> image at the given HWND.
[...]
> I would like get advice from codegurus here whether this
> approach is possible or not.

No.

Is the HWND just the handle to the main window for B.EXE ? If so, why not just enumerate the windows and find it that way ? Or use Copydata to send the info between processes ?

Christian

The content of this post is not necessarily the opinion of my yadda yadda yadda.

To understand recursion, we must first understand recursion.

Hi All,
I am working with VC++(Windows NT).I have created an ATL Service !Now, what I want firstly is that when I run that service, it should not appear in the Task Manager .But, at the background the process should be running ! How can I do that ?Which is the suitable API function for this ?

Thanx in advance for the Help .

Yamini Devi

Try to look at following adress:
http://www.codeguru.com/cgi-bin/bbs/wt/showpost.pl?Board=vc&Number=203057&page=0&view=collapsed&sb=5&category=

Alex

Hi All,
I am working with VC++.I have created an ATL Service !Now, what I want firstly is that when I run that service, it should not appear in the Task Manager .But, at the background the process should be running ! How can I do that ?Which is the suitable API function for this

Hi there, can someone give me an idea as to why this code:

/*****************************************************/
/* draw some text */
/*****************************************************/

CRect rect;
CFont TextFont, *oldFont;

CWnd *wnd = GetDlgItem(IDC_PLACEHOLDER); // find where to put the text (a static control)
ASSERT(wnd != NULL);
ASSERT(IsWindow(wnd->m_hWnd) != FALSE);
wnd->GetWindowRect(&rect);
ScreenToClient(&rect);

CPaintDC dc(this) ; // device context for painting

if (m_dc.GetSafeHdc() == NULL)
{
m_dc.CreateCompatibleDC(&dc) ;
m_bitmapTitle.CreateCompatibleBitmap(&dc, rect.Width(), rect.Height()) ;
m_pbitmapOldTitle = m_dc.SelectObject(&m_bitmapTitle) ;
}

TextFont.CreateFont (40, 0, 0, 0, 300, // Create the font
TRUE, FALSE, 0, ANSI_CHARSET,
OUT_DEFAULT_PRECIS,
CLIP_DEFAULT_PRECIS,
PROOF_QUALITY,
DEFAULT_PITCH|FF_SWISS, "Arial") ;

oldFont = m_dc.SelectObject(&TextFont); // select the font

m_dc.SetTextColor (RGB(128, 0, 0)) ; // set a bunch of attributes of the dc
m_dc.SetBkMode(OPAQUE);
m_dc.SetBkColor(::GetSysColor(COLOR_3DFACE));
m_dc.SetTextAlign (TA_LEFT);

CString Title = "Test ";

m_dc.TextOut(0, 0, Title);

m_dc.SelectObject(oldFont) ;

CDC memDC ;
CBitmap memBitmap ;
CBitmap* oldBitmap ; // bitmap originally found in CMemDC

// create a memory dc
memDC.CreateCompatibleDC(&m_dc) ;
memBitmap.CreateCompatibleBitmap(&m_dc, rect.Width(), rect.Height()) ;
oldBitmap = (CBitmap *)memDC.SelectObject(&memBitmap) ;

if (memDC.GetSafeHdc() != NULL)
{

// draw the text on the memory dc
memDC.BitBlt(0, 0, rect.Width(), rect.Height(),
&m_dc, 0, 0, SRCPAINT) ;

// bitblt the result to the display DC
dc.BitBlt(rect.left, rect.top, rect.Width(), rect.Height(),
&memDC, 0, 0, SRCCOPY) ;
}

memDC.SelectObject(oldBitmap) ;

/*****************************************************/
/* done... */
/*****************************************************/

produces perfectly fine output on Win NT but garbage on win 95/98/Me?? I'm stuck!! Cry | :((

to understand what I mean about garbage, please see Win NT and Win98

Thanks in advance for any help!

Liam O'Hagan

Thanks Big Grin | :-D

Senior Test Engineer
GLI Australia
www.gli.com.au

Without a real context (not a DC context) it's pretty hard to tell.
I can however tell you that you're in error to not check the return codes from each and every function above why I'd say you deserve the errors. After you've added those checks, perhaps you can see for yourself what went wrong? If not, that would be a good point to ask this question.

P.S.
If you're the "Senior Test Engineer" for that company, would you mind telling me what products you sell so I know what to stay clear of?

The code I posted was a cut and paste into a demo project, I removed a lot of stuff to make it more readable and easy to see what I was trying to do.

We don't sell any products, so rest assured you need not live in fear of coming across any software that might hurt your pwetty wittle compewter.... Big Grin | :-D

I'd be more than happy to tell you the products we test, but wait, what's that?? you're anonymous, silly me...

Thanks for the constructive criticism...

Senior Test Engineer
GLI Australia
www.gli.com.au

I've rewritten your function, I hope you find it a little neater Smile | :)

/*****************************************************/
/* draw some text */
/*****************************************************/

CRect rcWnd;
CFont TextFont, *oldFont;

CWnd *wnd = GetDlgItem(IDC_PLACEHOLDER); // find where to put the text (a static control)
ASSERT(wnd != NULL);
ASSERT(IsWindow(wnd->m_hWnd) != FALSE);
wnd->GetWindowRect(&rcWnd);
ScreenToClient(&rcWnd);

CDC placeDC;
if (!placeDC.Attach(wnd->GetDC()->GetSafeHdc()))
ASSERT(FALSE);

if (m_dc.GetSafeHdc() == NULL)
{
if (!m_dc.CreateCompatibleDC(&placeDC))
ASSERT(FALSE);
if (!m_bitmapTitle.CreateCompatibleBitmap(&placeDC, rcWnd.Width(), rcWnd.Height()))
ASSERT(FALSE);
m_pbitmapOldTitle = m_dc.SelectObject(&m_bitmapTitle) ;
m_dc.FillSolidRect(0, 0, rcWnd.Width(), rcWnd.Height(), ::GetSysColor(COLOR_3DFACE));
}

if (!TextFont.CreateFont (40, 0, 0, 0, 300, // Create the font
TRUE, FALSE, 0, ANSI_CHARSET,
OUT_DEFAULT_PRECIS,
CLIP_DEFAULT_PRECIS,
PROOF_QUALITY,
DEFAULT_PITCH|FF_SWISS, "Arial"))
ASSERT(FALSE);

oldFont = m_dc.SelectObject(&TextFont); // select the font

m_dc.SetTextColor (RGB(128, 0, 0)) ; // set a bunch of attributes of the dc
m_dc.SetBkMode(OPAQUE);
m_dc.SetBkColor(::GetSysColor(COLOR_3DFACE));
m_dc.SetTextAlign (TA_LEFT);

CString Title = "Test ";

m_dc.TextOut(0, 0, Title);

m_dc.SelectObject(oldFont) ;

placeDC.BitBlt(0, 0, rcWnd.Width(), rcWnd.Height(), &m_dc, 0, 0, SRCCOPY);

Basically your problem was that a CBitmap created under 98 using CreateCompatibleBitmap is full of random garbage. The line

m_dc.FillSolidRect(0, 0, rcWnd.Width(), rcWnd.Height(), ::GetSysColor(COLOR_3DFACE));

fixes this. You should have had text in the top corner though, but I'm not sure why you did not as I did a partial rewrite to get rid of unnecessary DC's, etc.

Where in Australia are you ? ( I'm in Tassie )

Christian

The content of this post is not necessarily the opinion of my yadda yadda yadda.

To understand recursion, we must first understand recursion.

Thanks Christian, it's good to see that some people are still considerate enough to help another person with their work.

Regards

Liam

Senior Test Engineer
GLI Australia
www.gli.com.au

I noticed, just today, that IE has an interesting feature when organizing your favourites list. What I noticed is a line appears under an entry when you drag over it. It appears that the line is indicating where the item will be dropped. What this means to me is that a folder can be repositioned within the list rather than becoming a child of the target. I would like to do the same thing but have no idea how. I see this same type of thing in other products, Netscape and DemoShield. Can anyone help me? Try it yourself if you have not experienced this yet!

Check these methods:

CTreeCtrl::SetInsertMark
CTreeCtrl::SetInsertMarkColor

They're simple wrappers around TVM_SETINSERTMARK and TVM_SETINSERTMARKCOLOR messages, supported on COMCTL version 4.71 and later. Basically this means that target machine must have IE 4.0 or later installed.

Tomasz Sowinski
http://www.shooltz.com.pl

does anyone know how make a window active when multiple windows are open.
in an mdi applicatin under window menu item there is a list of all open files and the active
one is checked, i want to know how that code works, so that when i click on my tree node
that window should be activated,

Thanks,

F.Dost

Yeah its pretty easy,

use the SetActiveWindow (hwnd ) function.. You need to get the window handle for the window you want to activate though..

Do that by

hwnd = FindWindow(NULL, "Put the window title here")
SetActiveWindow (hwnd )

If you are talking about the MDI "document windows", you need to send WM_MDI* messages to the "MDI client", the window that is usually in the dark gray colour.

Hello, the codegurus around the world.;)

I often use this function from "HOW-TO VISUAL C++ 4.0" by Scott ?
to change the active view on MDI application.

void CMainFrame::SwitchToView(CDocTemplate* pTemplate, CRuntimeClass* pViewClass)
{
	CMDIChildWnd* pMDIActive = MDIGetActive();
	CDocument* pDoc = pMDIActive->GetActiveDocument();
	CView* pView;

	POSITION pos = pDoc->GetFirstViewPosition();
	while(pos != NULL)
	{
		pView = pDoc->GetNextView(pos);
		if(pView->IsKindOf(pViewClass))
		{
			//the requested view has already been created; show it
			pView->GetParentFrame()->ActivateFrame();
			return;
		}
	}

	//The requested view hasn't been created yet
	CMDIChildWnd* pNewFrame = (CMDIChildWnd*)
		pTemplate->CreateNewFrame(pDoc, NULL);

	if(pNewFrame == NULL) return;

	pTemplate->InitialUpdateFrame(pNewFrame, pDoc);

}

and call this function anywhere like this.

((CMainFrame*)AfxGetMainWnd())->SwitchToView(theApp.m_pAppTemplate,
        RUNTIME_CLASS(CAppView));

Have a nice day!
-Masaaki Onishi-

I know how to define flags...

#define FLAG1 0x00000001
#define FLAG2 0x00000002
#define FLAG3 0x00000004
#define FLAG4 0x00000008

#define FLAG5 (FLAG1|FLAG2|FLAG3|FLAG4) //for all

I would also like to have a way that FLAG1 -FLAG4 cant be ORed together expected when ORed together in FLAG5's ()

Any help...

hey brandon

preventing them from being or'd is simply a case of not writing code that or's them together

you can't stop certain bit combinations from appearing except by not creating them in the first place

---
"every year we invent better idiot proof systems and every year they invent better idiots"

Brandon,

You can't prevent someone from creating a particular value (after all, you don't have physical control over their keyboards Smile | :)

). What you want is an assert in your code that checks the passed-in flags. This will tell the programmer that they have passed you an illegal combo of flags.

void CYourFunction ( DWORD dwFlags )
{
  ASSERT( (dwFlags & FLAG1|FLAG2|FLAG3|FLAG4) == FLAG1|FLAG2|FLAG3|FLAG4 ||
          (dwFlags & FLAG1|FLAG2|FLAG3|FLAG4) == 0 );
 
  // function here...
}

This verifies that all or none of FLAG1-4 were passed.

Use ASSERT in MFC code, ATLASSERT in ATL, and _ASSERTE for plain ol' CRT.

--Mike--
http://home.inreach.com/mdunn/
The Signature, back by popular demand: Buffy. Pajamas.

Thank you that is what I was looking for.

I would like to know if there are similar functions as clreol and gotoxy which are not supported by vc++ Smile | :)

What do they do ? In GDI you have MoveTo, is that what gotoxy does ?

Christian

The content of this post is not necessarily the opinion of my yadda yadda yadda.

To understand recursion, we must first understand recursion.

AFAIK, VC runtime library exposes no such functionality. If you really want to play with text-mode windows/menus, your only hope are low-level console APIs, like WriteConsoleOutputCharacter Smile | :)

Tomasz Sowinski
http://www.shooltz.com.pl