C / C++ / MFC

Re: converting Strucutre to Byte array

27-Jun-09 4:01

Hi if possible please try to suggest me any solution for the thread Setting Font.. which
i posted below...

CPallini27-Jun-09 5:28

Does it have a part for C++ builder?

27-Jun-09 5:28

Indeed. Anyway you may send only sizeof(char)+sizeof(int) bytes. Of course then you've to make sure sizeof(int) is the same on both the sides. Roll eyes | :rolleyes:

favorxx26-Jun-09 22:20

favorxx

26-Jun-09 22:20

I've found the C/C++/MFC, but not found the C++ builder, does it have one for C++ builder in this website? Confused | :confused:

Re: Does it have a part for C++ builder?

CPallini27-Jun-09 0:37

Re: Does it have a part for C++ builder?

27-Jun-09 0:37

Do you mean a forum for C++ Builder? No we haven't. Anyway you try to ask your question here.
Smile | :)

favorxx27-Jun-09 3:19

favorxx

27-Jun-09 3:19

Thank you very much

How to read footer at a sector using C++/VC++

Shiv Murti Pal26-Jun-09 21:51

Shiv Murti Pal

26-Jun-09 21:51

How to read footer at a sector using C++/VC++

Write PE with VC6 [modified]

tuan111126-Jun-09 18:51

tuan1111

26-Jun-09 18:51

Hi!
I want to write to PE run on empty OS.
It help winAPI run on "Empty OS"
Please,full code & guide
Thanks : -D
-D -D -D -D -D -D
Vietnam.
by:tuan1111 Smile | :)

modified on Monday, July 20, 2009 9:24 PM

Re: Write kernel OS

Michael Schubert27-Jun-09 0:52

Michael Schubert

27-Jun-09 0:52

You're not giving up, are you?

tuan1111 wrote:
I'm reading bootloader

Try to read an English course first.

Alternatively, run your post through several, randomly selected languages on translate.google.com, I'm sure it will make more sense then.

tuan1111 wrote:
I say the hard things I want them

What?

tuan1111 wrote:
Please provide code

Let me correct that for you:
Pleeze sendz codez

Re: Write kernel OS

sashoalm27-Jun-09 2:37

sashoalm

27-Jun-09 2:37

The above post wouldn't be out of place in this site[^]

Smile | :)

There is sufficient light for those who desire to see, and there is sufficient darkness for those of a contrary disposition.
Blaise Pascal

Context sensitive help in MFC app

Sternocera26-Jun-09 11:39

Sternocera

26-Jun-09 11:39

Hello,

I'm developing an MFC application that I'd like to provide context sensitive help for. Does MFC provide such a facility? I think that .chm files are deprecated in Windows vista - something called MAML is used instead.

My questions is, what is the modern, preferred way to create context sensitive help within MFC?

Regards,
Sternocera

[SOLVED] Help needed with Alphablend function [modified]

Rozis26-Jun-09 11:01

26-Jun-09 11:01

Is there anbody out there who has a working code snippet that uses WinApi function Alphablend()?
Can Alphablend() be used with a bitmap that has no alphachannel?

Thanx

modified on Sunday, June 28, 2009 5:00 AM

PJ Arends26-Jun-09 12:05

26-Jun-09 12:05

I use it on a splash screen.

header file:

typedef BOOL (WINAPI ALPHABLEND)(HDC, int, int, int, int, HDC, int, int, int, int, BLENDFUNCTION);
typedef ALPHABLEND* LPALPHABLEND;

class ...
{
...
   HINSTANCE m_hLib;
   LPALPHABLEND m_lpfnAlphaBlend;
...
};

source file:

// in class c'tor
        m_hLib = LoadLibrary(_T("msimg32.dll"));
        if (m_hLib != NULL)
        {
            m_lpfnAlphaBlend = (LPALPHABLEND)GetProcAddress(m_hLib, "AlphaBlend");
        }

// in class d'tor
    if (m_hLib != NULL)
    {
        FreeLibrary(m_hLib);
        m_hLib = NULL;
    }


BOOL C*********::OnEraseBkgnd(CDC* pDC) 
{
    CDialog::OnEraseBkgnd(pDC);

    if (m_lpfnAlphaBlend != NULL)
    {
        CRect rc;
        GetClientRect(rc);

        BITMAP b;
        if (GetObject(m_hBitmap,
                      sizeof(BITMAP),
                      &b))
        {
            CDC DC;
            DC.CreateCompatibleDC(pDC);
            int s = DC.SaveDC();

            DC.SelectObject(m_hBitmap);
            
            BLENDFUNCTION bf = {0};
            bf.BlendOp = AC_SRC_OVER;
            bf.SourceConstantAlpha = 0x20;

            m_lpfnAlphaBlend(*pDC,
                             (rc.Width() - b.bmWidth) / 2,
                             (rc.Height() - b.bmHeight) / 2,
                             b.bmWidth,
                             b.bmHeight,
                             DC,
                             0,
                             0,
                             b.bmWidth,
                             b.bmHeight,
                             bf);
            DC.RestoreDC(s);
        }
    }
	
    return TRUE;
}

You may be right
I may be crazy
-- Billy Joel --

Within you lies the power for good - Use it!

Rozis27-Jun-09 2:22

27-Jun-09 2:22

Tnx for an answer..

I spelled your code character by character and it seems that i do essentially the same. So this leaves me to ask you some stupid questions:

1. Is bf.BlendOp = AC_SRC_OVER; the same as: bf.BlendOp = 0; ??
2. To my opinion you do nothing to add an alpha channel to your bitmap. Thus your bitmap has no alpha channel - do you agree on that?
3. Because i use another language then you: what does int s = DC.SaveDC() ; do? Is this one essential to Alphablend?

Thanks
Rozis

PJ Arends27-Jun-09 7:08

27-Jun-09 7:08

Rozis wrote:
1. Is bf.BlendOp = AC_SRC_OVER; the same as: bf.BlendOp = 0; ??

from wingdi.h:

#define AC_SRC_OVER                 0x00

Rozis wrote:
2. To my opinion you do nothing to add an alpha channel to your bitmap. Thus your bitmap has no alpha channel - do you agree on that?

From MSDN[^]:

When the AlphaFormat member is AC_SRC_ALPHA, the source bitmap must be 32 bpp. If it is not, the AlphaBlend function will fail.

So you are correct, I did not worry about the alpha channel. I just set the AlphaFormat value to zero.

Rozis wrote:
3. Because i use another language then you: what does int s = DC.SaveDC() ; do? Is this one essential to Alphablend?

See http://msdn.microsoft.com/en-ca/library/dd162945(VS.85).aspx[^] and http://www.flounder.com/savedc.htm[^]

You may be right
I may be crazy
-- Billy Joel --

Within you lies the power for good - Use it!

Rozis27-Jun-09 9:25

27-Jun-09 9:25

hmmm... im out of questions but it still doesn't run. This my code: (warning: this is not C-code, but i'll explain when needed)

hMemDC:=CreateCompatibleDC(hdc) // ':=' is used as '=' in C
if hMemDC!=NULL_PTR
  hbitmap:=CreatecompatibleBitmap(hdc,w,h)
  hold:=SelectObject(hMemDC,hBitmap)
  Rectangle(hmemDC,0,0,w,h)
  blendfunc.BlendOp:=0       // blendfunc is a structure BlendOp a member of this structure
  blendfunc.BlendFlags:=0
  blendfunc.SourceConstantAlpha:=128 //half transparent
  blendfunc.AlphaFormat:=0
  AlphaBlend(hdc,x,y,w,h,hMemDC,0,0,w,h,@blendfunc) // Here's the troublemaker
//StretchBlt(hdc,x,x,w,h,hMemDC,0,0,w,h,SRCCOPY)
//BitBlt(hdc,x,x,w,h,hMemDC,0,0,SRCCOPY)
  SelectObject(hMemDC,hold)
  DeleteObject(hBitmap)
  DeleteDC(hMemDC)
endif

When i use StretchBlt() or BitBlt() instead it works (altough not transparent). I checked if x,y,w and h are possitive - they are. Think you may ask whats '@blendfunc'. It means 'pointer to structure'. Use this construct for years so must be correct (for example in GetClientRect()). Tried a demo-exe from the code project to find out if problem is system related - it worked ok. Checked the prototype and the structure. I must do something really stupid...

Rozis

PJ Arends27-Jun-09 13:14

27-Jun-09 13:14

Rozis wrote:
Think you may ask whats '@blendfunc'. It means 'pointer to structure'.

That is the problem right there. AlphaBlend takes the structure, not a pointer to a structure, as the final parameter.

You may be right
I may be crazy
-- Billy Joel --

Within you lies the power for good - Use it!

Rozis28-Jun-09 0:00

28-Jun-09 0:00

Guess what, you're right!! That was the thing i was overlooking. You're a genius!!!
Did a quick try, made 0x00800000 as the last parameter to Alphablend() and it does the job. And it is lightyears faster then the workaround i made with getpixel(). Problem solved!

The reason i never questioned it, is because a struct is a chunk of memory so i expected this would always be a pointer when used as a parameter. I mean: when a have a struct of let's say 200 bytes and use it as a parameter to a function would this mean these 200 bytes are allocated on the stack?

Saw you're living in Canada, although you have a dutch name. So whenever you are in holland, call me, i have a present for you. Thanks for taking your time.

Rozis

PJ Arends28-Jun-09 20:48

Setting font.. [modified]

28-Jun-09 20:48

Rozis wrote:
You're a genius!!!

Not really, I just read the documentation Roll eyes | :rolleyes:

, I am just glad to be able to help.

Rozis wrote:
Saw you're living in Canada, although you have a dutch name.So whenever you are in holland, call me, i have a present for you

My grandparents emigrated from Holland to Canada in the fifties. I would love to go there some day and see where my heritage comes from. Maybe when I do finally manage the trip I will try to look you up and take you up on your offer.

You may be right
I may be crazy
-- Billy Joel --

Within you lies the power for good - Use it!

kumar sanghvi26-Jun-09 10:53

26-Jun-09 10:53

Hi,
i have a resource file in which i have changed the font property of the dialog to "Arial" regular
20....
then the font inside the dialog got increased...along with the text of the controls inside dialog..

and now i tried changing from the code in initDialog function like...

CFont newfont;
LOGFONT lf;
SecureZeroMemory(&lf, sizeof(lf));
lf.lfHeight = 20;
lf.lfWeight = FW_MEDIUM;
lstrcpy(lf.lfFaceName, _T("Arial"));
newfont.CreateFontIndirect(&lf);
GetDlgItem(IDC_CHECK1)->SetFont(&newfont);

GetDlgItem(IDC_STATIC)->SetFont(&newfont);

newfont.Detach();

and now when i build and see the output the look of the dialog with new font is not same and even the font looks smaller than the font of the dialog which i have tried to change manually the font property of the Dialog....

Please suggest me how can i make changes to my code so that both look similar....

modified on Friday, June 26, 2009 4:20 PM

CPallini26-Jun-09 11:06

26-Jun-09 11:06

Well, it looks like newfont goes out of scope.
Smile | :)

kumar sanghvi26-Jun-09 11:10

26-Jun-09 11:10

i mean even though thru code i have applied the font height as 20 font looks smaller
than the font which is obtained by manual change....

the font(thru code) is getting applied but it doesn"t looks same as the other font(manual)..

CPallini26-Jun-09 11:25

26-Jun-09 11:25

OK.

kumar sanghvi wrote:
lf.lfHeight= 20;

From MSDN [^]:

For the MM_TEXT mapping mode, you may use the following formula to specify a height for a font with a given point size.

lfHeight = -MulDiv(PointSize, GetDeviceCaps(hDC, LOGPIXELSY), 72);

where MulDiv is defined as follows:

#define MulDiv(a,b,c)       (((a)*(b))/(c))

kumar sanghvi26-Jun-09 18:55