C / C++ / MFC Discussion Boards

f6431-May-04 8:22

31-May-04 8:22

Hi Check the MSDN fot CWnd::OnCtlColor, it even has a example of what you are asking. You just have to verify the message is for the control you want to change, otherwise do nothing.

Extracted form the MSDN

// This OnCtlColor handler will change the color of a static control
// with the ID of IDC_MYSTATIC. The code assumes that the CMyDialog
// class has an initialized and created CBrush member named m_brush.
// The control will be painted with red text and a background
// color of m_brush.

HBRUSH CZilchDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor) 
{
   // Call the base class implementation first! Otherwise, it may
   // undo what we're trying to accomplish here.
   HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);

   <big>// Are we painting the IDC_MYSTATIC control? We can use
  // CWnd::GetDlgCtrlID() to perform the most efficient test.</big>   
   if (pWnd->GetDlgCtrlID() == IDC_MYSTATIC)
   {
      // Set the text color to red
      pDC->SetTextColor(RGB(255, 0, 0));

      // Set the background mode for text to transparent 
      // so background will show thru.
      pDC->SetBkMode(TRANSPARENT);

      // Return handle to our CBrush object
      hbr = m_brush;
   }

   return hbr;
}

Fabian

Re: Problem with SetTextColor

Aviv Halperin31-May-04 9:16

Aviv Halperin

31-May-04 9:16

Thanks now its working fine,
I dont know how I missed this example in the MSDN (should have thought of it myself anyway), I only found a very general one with no reference as to the caller.
Is it possible maybe to call SetTextColor from outside OnCtlColor?
I tried it in various places and handlers but it did not seem to work(including in the OnPaint handler).
Maybe the attributes set for the DC fonts color are blocked when called from outside this segment of code...

Thanks again.

avivhal

documentation of jpeg format

includeh1031-May-04 6:54

includeh10

31-May-04 6:54

hi all,

i need good docs about jpeg format, i have to create my own file format for compressing bmp file based on jpeg.
all i have are poor jpeg docs from internet.

thanks for any link to better docs of jpeg format
cheers

includeh10

Re: documentation of jpeg format

Nirav Doshi31-May-04 9:11

Nirav Doshi

31-May-04 9:11

Try:
The Programmer's File Format Collection.

http://www.wotsit.org/[^]

* Don't wish it was easier, wish you were better! *

Re: documentation of jpeg format

includeh1031-May-04 9:49

includeh10

31-May-04 9:49

it looks useful.
thanks

includeh10

Re: documentation of jpeg format

Nirav Doshi31-May-04 22:23

Nirav Doshi

31-May-04 22:23

I forgot to mention yesterday, you can get latest info about JPEG from the organization's official site too:

http://www.jpeg.org[^]

* Don't wish it was easier, wish you were better! *

Gradients

Archer28231-May-04 6:35

Archer282

31-May-04 6:35

Can someone point me to an artical that shows you how to draw gradients on a DC?

Re: Gradients

f6431-May-04 8:00

f64

31-May-04 8:00

Hi Check GradientFill() on the Win32 API documentation.

Fabian

Re: Gradients

TrungHuynh31-May-04 13:24

TrungHuynh

31-May-04 13:24

you can do follow:

void CBMSButton::GradientFillRect(HDC hDC, RECT& rc, COLORREF crLight, COLORREF crDark)
{
TRIVERTEX vert[2];
GRADIENT_RECT gRect;
vert [0].x = rc.left;
vert [0].y = rc.top;
vert [0].Red = GetRValue(crLight) << 8;
vert [0].Green = GetGValue(crLight) << 8;
vert [0].Blue = GetBValue(crLight) << 8;
vert [0].Alpha = 0x0000; // It's no use for GradientFill

vert [1].x = rc.right;
vert [1].y = rc.bottom;
vert [1].Red = GetRValue(crDark) << 8;
vert [1].Green = GetGValue(crDark) << 8;
vert [1].Blue = GetBValue(crDark) << 8;
vert [1].Alpha = 0x0000;

gRect.UpperLeft = 0;
gRect.LowerRight = 1;
GradientFill(hDC, vert, 2 , &gRect, 1, GRADIENT_FILL_RECT_V);
}

You must import library:
#pragma message(" Automatically linking with MSIMG32.LIB library")
#pragma comment(lib, "MSIMG32.LIB")

Re: Gradients The Best

Sumit Kapoor31-May-04 18:04

Sumit Kapoor

31-May-04 18:04

Hi Dear...Try this..

----------------------------------------
CRect rect,rcClient;
GetClientRect(rcClient);
rect = rcClient;
int r1=32,g1=108,b1=244; //Any start color
int r2=5,g2=55,b2=165; //Any stop color

for(int i=0;i<rect.width();i++)
{=""
="" int="" r,g,b;
="" r="r1" +="" (i="" *="" (r2-r1)="" rect.width());
="" g="g1" (g2-g1)="" b="b1" (b2-b1)="" pdc-="">FillSolidRect(i,0,1,rect.Height(),RGB(r,g,b));
}

-------------------------------------------
This is not mine code, I'm also user of this code...but work nice...
OK! Good Bye

---Sumit Kapoor--- sumit_kapoor1980@hotmail.com

Re: Gradients The Best

Archer28231-May-04 18:09

Archer282

31-May-04 18:09

yes, i found that artical earlier today, and i got it to work, but i had to put the code in the OnPaint overide

but there is one thing i dont get about this formula

r1 + (i * (r2-r1) / rect.Width());

i know what it does, and why its needed, but i dont understand how the writer came up with it.

Re: Gradients The Best

Sumit Kapoor31-May-04 19:25

Sumit Kapoor

31-May-04 19:25

Actually...
The writer do very nice thing in this code..
as u can see.. we ca make shading from any color to other in fix area.. this is only possible if we change color according to side of area..that is what he is doing..
change color but with eyes on area..
OK bye...

Never consider anything Impossible before trying to solve that..---Sumit Kapoor---

Re: Gradients The Best (Mistake due to HTML)

Sumit Kapoor31-May-04 18:19

Sumit Kapoor

31-May-04 18:19

hi..
for loop in above code consider < as HTML TAG

so replace that with:

for(int i=0;i<rect.Width();i++)

---Sumit Kapoor---

Re: Gradients

Rick York1-Jun-04 10:37

Rick York

1-Jun-04 10:37

This article shows one method : http://www.codeproject.com/samples/fortune.asp[^]

__________________________________________
a two cent stamp short of going postal.

How to add Controls in CView

RedDragon2k31-May-04 4:59

RedDragon2k

31-May-04 4:59

Hi!

How can I create Controls in a CView Class ???
Please Help

MFG
RedDragon

Unix and C are the ultimate computer viruses.

Visit me: www.programming.info.ms

Re: How to add Controls in CView

valikac31-May-04 6:54

valikac

31-May-04 6:54

What controls?

Kuphryn

Re: How to add Controls in CView

includeh1031-May-04 6:58

includeh10

31-May-04 6:58

you can add any controls to CView with style WS_CHILD and the CView as its parent - the control can be CDialog also if use function Create() - not DoModal().

cheers

includeh10

Re: How to add Controls in CView

David Crow1-Jun-04 4:03

David Crow

1-Jun-04 4:03

Sounds like you need a CFormView instead.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: How to add Controls in CView

Anonymous1-Jun-04 9:47

Anonymous

1-Jun-04 9:47

I've solved the problem already. Thx to everyone

command line arguement for Win32

Member 115017631-May-04 4:58

Member 1150176

31-May-04 4:58

Sir,
I have developed an application using Win32.
Inside main(){
..
}
I have created a server socket and waiting to accept to connect.

How should I create an exe fom the command line.
It takes WS2_32.lib AS a parameter to give an exe.

Pls guide what can be command line parameters so that it can combine with the lib file to create exe..

Re: command line arguement for Win32

valikac31-May-04 6:55

valikac

31-May-04 6:55

You cannot link a library to an executable at runtime. How do you expect to compile the winsock library at runtime?

Kuphryn

Re: command line arguement for Win32

Member 115017631-May-04 17:59

Member 1150176

31-May-04 17:59

my aim is ti likn the object file and the lib file to create the exe.
How should I go about this

Re: command line arguement for Win32

David Crow1-Jun-04 4:06

David Crow

1-Jun-04 4:06

kuphryn wrote:
You cannot link a library to an executable at runtime.

Sure you can. It's called explicit linking.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: command line arguement for Win32

valikac1-Jun-04 6:42

valikac

1-Jun-04 6:42

Correct. Explicit linking works for DLL. How about library?

Kuphryn

Re: command line arguement for Win32

Nirav Doshi31-May-04 9:18

Nirav Doshi

31-May-04 9:18

I think you can just give a #pragma directive like:

#pragma comment (lib, "ws2_32")

in your source code (It can be a common header file, like stdafx.h, if you're using MFC!)

With this directive, you will NOT require any command line parameters, or even to include the LIB/DLL file in your project settings. The compiler will pick up the LIB file and use it while compiling.

* Don't wish it was easier, wish you were better! *

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