C / C++ / MFC Discussion Boards

_Flaviu24-Jun-13 21:18

24-Jun-13 21:18

Does anyone meet the sitation when a image with many horizontal lines, with low levels zoom (when image is fit to window), is seen with moire effect ? And the drawing is made in classic way:

C++

...
pDC->SetStretchBltMode(COLORONCOLOR);
pDC->StretchBlt(xDst, yDst, nDstWidth, nDstHeight, pMemDC, xSrc, ySrc, nSrcWidth, nSrcHeight, SRCCOPY);
...

I had tried with stretch mode HALFTONE, with the same results ...

After all, I dind't know where the problem come ... (P.S. I draw with GDI).

Re: Moire effect

CPallini24-Jun-13 21:36

CPallini

24-Jun-13 21:36

You might try my DLL[^].

Veni, vidi, vici.

Re: Moire effect

_Flaviu24-Jun-13 21:49

_Flaviu

24-Jun-13 21:49

Thank you, I doubt that you have an VC6 version of your project ... Smile | :)

Do you ? And one thing, what is the source of the problem ? From where the problem came from ?

Re: Moire effect

CPallini24-Jun-13 22:05

CPallini

24-Jun-13 22:05

Nope. However, the DLL project contains just two important files, namely resample.c and resample.h. You may generate a DLL project skeleton via Visual Studio 6 Application Wizard and then add such files to it (probably you have to replace the generated header and source).
It should be simple.
You may even embed the resample.c and resample.h content directly into your project (that is without the need of loading the DLL).

Veni, vidi, vici.

Re: Moire effect

JackDingler26-Jun-13 11:48

JackDingler

26-Jun-13 11:48

It looks like someone has given you a solution, so I'll explain a bit why this happens.

The resizing of your image using GDI is a simple re-sampling algorithm. When you shrink it, pixels in a horizontal and vertical direction are removed, at a semi regular spacing, to make the image fit the new size.

This has the effect of producing a horizontal and vertical waveform in your image.
Your parallel lines in the image, also make up a wave pattern.

When these two wave patterns interact, you get an interference pattern and see the Moire' effect.

http://en.wikipedia.org/wiki/Moire_effect[^]

a C++ / XINPUT project getting underway..

JimmyOneSlap23-Jun-13 14:42

JimmyOneSlap

23-Jun-13 14:42

Hi all,
I'm about to embark on my first development project. I'm really happy to see so much community spirit and collaboration going on online. Im going to be using the Neurosky SDK with C++ in order to read brainwave data, and I'll be using that data to manipulate the responsiveness of an Xbox 360 controller depending on how well the user is concentrating. Hopefully it'll be a fun little tool to assist gamers in staying alert!

If anyone has experience with XINPUT and has some pointers to set me off in the right direction that would be great!

I do have a specific question too. - How best to approach the issue of Computer Games reading directly from the Xbox controller and ignoring my program altogether?

All suggestions welcome! Smile | :)

Re: a C++ / XINPUT project getting underway..

Richard MacCutchan23-Jun-13 21:10

Richard MacCutchan

23-Jun-13 21:10

This is really not a C++ question, and I suspect you would get better support by looking at some of these links[^].

Use the best guess

implemented code of inline assembly language on any of the method e.g: Stack, Calculator

Member 1012140622-Jun-13 6:05

Member 10121406

22-Jun-13 6:05

Kindly send or inform me if you can help me out.
Thanks

Re: implemented code of inline assembly language on any of the method e.g: Stack, Calculator

NotPolitcallyCorrect22-Jun-13 6:19

NotPolitcallyCorrect

22-Jun-13 6:19

Please do not cross post. Pick one forum and stick to it.

DirectShow Source Filter Connection Error 0x8004022F

sdancer7520-Jun-13 21:54

sdancer75

20-Jun-13 21:54

Trying to build my own source filter (AVI format) I always get connection error with AVI Splitter.

Please take in mind that I am trying to open a fully functional avi video file, that works just fine with microsoft's async file and I that tried at the very begginng to change my mediatype declaration without success.

The error description in the graphEdit is "These filters cannot agree on connection. Verify type compatibility of input pin and output pin. Return code VFW_E_INVALID_FILE_FORMAT
0x8004022F".

DXerr.exe reports :

HRESULT: 0x80040207 (2147746311)
Name: DIERR_NOTBUFFERED
VFW_E_NO_ACCEPTABLE_TYPES
Description: Attempted to read buffered device data from a device that is not buffered. & There is no common media type between these pins.
Severity code: Failed
Facility Code: FACILITY_ITF (4)
Error Code: 0x0207 (519)

My mediatype is declared as :

C++

const AMOVIESETUP_MEDIATYPE sudOpPinTypes =
{ 
	&MEDIATYPE_Stream, 
	&MEDIASUBTYPE_NULL 
};

I debugged the code and I found that somewhere in the

C++

HRESULT CBasePin::AgreeMediaType(IPin *pReceivePin, const CMediaType *pmt)

inside the amfilter.cpp is gettings first the AVI Splitter's MediaType list with the folowing code :

C++

hr = pReceivePin->EnumMediaTypes(&pEnumMediaTypes);

Ok with that. Then it tries all mediatypes inside the method

C++

HRESULT CBasePin::TryMediaTypes(IPin *pReceivePin, __in_opt const CMediaType *pmt, IEnumMediaTypes *pEnum)

by retriving them one by one with the following statement

C++

hr = pEnum->Next(1, (AM_MEDIA_TYPE**)&pMediaType,&ulMediaCount);

At this point, the hr result returns S_FALSE and the pMediaType is undefined. The error code is

0x8004022f error code
VFW_E_INVALID_FILE_FORMAT

So the AVISplitter does not purpose any right ?

Now the code beggins to scan my own source filter mediatype list.

Despite the fact that I declared 2 or 3 different mediatypes it returns only one and it fails at

C++

hr = AttemptConnection(pReceivePin, pMediaType);

and specifically at

C++

hr = pReceivePin->ReceiveConnection((IPin *)this, pmt);

What am I doing wrong ?

I suspect my MediaType declaration, but i dont see anything wrong. Below I attach the filter's template declarations with only one mediatype.

C++

const WCHAR szAsyncFile[] = L"Async Source (File)";
const WCHAR szAsyncHttp[] = L"Async Source (Http)";

//
// Setup data for filter registration
//
const AMOVIESETUP_MEDIATYPE sudOpPinTypes =
{ 

	&MEDIATYPE_Stream, 
	&MEDIASUBTYPE_NULL 
	

};



const AMOVIESETUP_PIN sudOpPin =
{ 
	
		L"Output",          // String pin name
		FALSE,              // Is it rendered
		TRUE,               // Is it an output
		FALSE,              // Allowed none
		FALSE,              // Allowed many
		&CLSID_NULL,        // Connects to filter
		L"Input",           // Connects to pin
		1,					// Number of types
		&sudOpPinTypes		// The pin details
    
};



const AMOVIESETUP_FILTER sudAsyncFile =
{ 
    &CLSID_PIAsyncFile,				 // clsID
    szAsyncFile,                    // strName
    MERIT_UNLIKELY,                 // dwMerit
    1,                              // nPins
    &sudOpPin                       // lpPin
};

const AMOVIESETUP_FILTER sudAsyncHttp =
{ 
    &CLSID_PIAsyncHttp,				// clsID
    szAsyncHttp,                    // strName
    MERIT_UNLIKELY,                 // dwMerit
    1,                              // nPins
    &sudOpPin                       // lpPin
};




//
//  Object creation template
//
CFactoryTemplate g_Templates[] = 
{
    { 
        szAsyncFile,
        &CLSID_PIAsyncFile,
        CAsyncFilter::CreateInstance,
        NULL,
        &sudAsyncFile  
    },

    {
        szAsyncHttp,
        &CLSID_PIAsyncHttp,
        CAsyncFilterHttp::CreateInstance,
        NULL,
        &sudAsyncHttp
    }


};



int g_cTemplates = sizeof(g_Templates) / sizeof(CFactoryTemplate);

sdancer75

modified 21-Jun-13 8:45am.

How to add shadow to a dialog without border

smithzhang20-Jun-13 20:17

smithzhang

20-Jun-13 20:17

Hi, all

I create a new dialog based on MFC (VS2008) without border.

But i found that the dialog without shadow when executing.

how to add the shadow to it.

please help me. thanks

Re: How to add shadow to a dialog without border

smithzhang20-Jun-13 20:34

smithzhang

20-Jun-13 20:34

the style of the dialog is popup

the border is none

Font size of menu text in MFCRibbonbar in feature pack.

Anu_Bala20-Jun-13 19:16

Anu_Bala

20-Jun-13 19:16

Im using MFC feature pack for my application to create menu bar looks like MS Office.
But is there any option to change the fonst size of text appearing in Ribbon Panel.

I used Add Category, Add Panel and CMFCRibbonButton for buttons in Panel. Just i want to increase the text size in each button.Now it appears very small.

Anu

OnLButtonDown not getting called for Slider Control in MFC.?

mbatra3120-Jun-13 7:04

mbatra31

20-Jun-13 7:04

Hi,

I am using a slider control on a dialog box. I have handled OnLButtonDown for Slider control. But I wonder its not getting called whenever I click on the slider thumb, instaed it gets called when I click anywhere on the dialog.

I want to handle OnLButtonDown when I click on the slider thumb.

Anybody have any idea where is the issue.?

Any help will be appreciated.

Regards,
Mbatra

Re: OnLButtonDown not getting called for Slider Control in MFC.?

thanh_bkhn20-Jun-13 18:59

thanh_bkhn

20-Jun-13 18:59

Do you really need a OnLButtonDown on a Slider control? If you just want to handle whenever its value get changed, you can try OnHScroll or OnVScroll instead.

Re: OnLButtonDown not getting called for Slider Control in MFC.?

mbatra3120-Jun-13 19:20

mbatra31

20-Jun-13 19:20

Hi,

Yes I do need to handle OnLButtonDown.
Scenario is I am using slider control to show the progress of the video. Slider will be incremented in steps in proportion to the time elapsed for the video. Now when I click on the slider and hold for the moment, I need to stop it, otherwise the slider keeps incrementing with the timer while still user is holding the mouse on clicking on its thumb.
So I need to handle this message handler. I have tried in OnHScroll also, it didn't work.

Regards,
Mbatra

Re: OnLButtonDown not getting called for Slider Control in MFC.?

thanh_bkhn20-Jun-13 20:27

thanh_bkhn

20-Jun-13 20:27

In the OnHScroll, the UINT nSBCode parameter contains the code message. nSBCode == TB_THUMBTRACK when you use the mouse to drag it.

Re: OnLButtonDown not getting called for Slider Control in MFC.?

mbatra3120-Jun-13 20:35

mbatra31

20-Jun-13 20:35

I had already tried this......NOT WORKING.

just check the same case.....Click on the slider thumb, but don't move the slider. Just click the left button and hold. Slider thumb keeps on moving with the timer and video progression.

I need to left click the mouse button on the slider thumb and handle that message.

Regards,
Mbatra

Re: OnLButtonDown not getting called for Slider Control in MFC.?

David Crow21-Jun-13 10:12

David Crow

21-Jun-13 10:12

I just tried and I get notifications of each move. Code excerpt looks like:

BEGIN_MESSAGE_MAP(CTestDlg, CDialog)
    ON_NOTIFY(TRBN_THUMBPOSCHANGING, IDC_SLIDER1, &CTestDlg::OnTRBNThumbPosChangingSlider1)
END_MESSAGE_MAP()

void CTestDlg::OnTRBNThumbPosChangingSlider1(NMHDR *pNMHDR, LRESULT *pResult)
{
    NMTRBTHUMBPOSCHANGING *pNMTPC = reinterpret_cast<NMTRBTHUMBPOSCHANGING *>(pNMHDR);

    TRACE(_T("Position = %lu\n"), pNMTPC->dwPos);

    *pResult = 0;
}

Did you remember to turn on the "Notify Before Move" style?

"One man's wage rise is another man's price increase." - Harold Wilson

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Re: OnLButtonDown not getting called for Slider Control in MFC.?

mbatra3121-Jun-13 20:16

mbatra31

21-Jun-13 20:16

Hi David,

Thanx for the reply.

Also plz help me to solve one more issue. I want to to move the thumb where user has clicked the mouse, not in ticks.

Slider thumb should move to the position in one shot, user clicked the mouse...

I tried this code.....but it didn't work for me.

CRect rc, trc;
		m_Slider.GetChannelRect(rc);
		m_Slider.GetThumbRect(trc);
		rc.InflateRect(0, (trc.Height() - rc.Height())/2);
		if (!PtInRect(rc, point))
		return;
		LONG range = m_Slider.GetRangeMax();
		LONG pos = point.x - rc.left - trc.Width()/2;
		LONG width = rc.Width() - trc.Width();
		m_Slider.SetPos(int(DOUBLE(pos) * range / width + 0.5));

Please share any sample code if you have.

Regards,
Mbatra

Re: OnLButtonDown not getting called for Slider Control in MFC.?

David Crow24-Jun-13 5:29

David Crow

24-Jun-13 5:29

Try something like:

void CSliderCtrlEx::OnLButtonDown(UINT nFlags, CPoint point)
{
    CSliderCtrl::OnLButtonDown(nFlags, point);

    CRect rectClient;
    GetClientRect(rectClient);

    CRect rectChannel;
    GetChannelRect(rectChannel);

    int nPos = (GetRangeMax() - GetRangeMin()) * 
               (point.x - rectClient.left - rectChannel.left) / 
               (rectChannel.right - rectChannel.left);   

    SetPos(nPos);
}

modified 3-Jul-13 10:50am.

Re: OnLButtonDown not getting called for Slider Control in MFC.?

mbatra3124-Jun-13 22:40

mbatra31

24-Jun-13 22:40

Hi David,

I tried this one also....Still not working.

I had one issue, I don't know but the OnLButtonDown() handler is not getting called anymore. This is happening in case of mine.

That's why I was not able to set the position of the slider.

I have done like this:

void CCapturePage::OnLButtonDown(UINT nFlags, CPoint point)
{
   //CSliderCtrl::OnLButtonDown(nFlags, point);
    CRect rectClient;
    GetClientRect(rectClient);
 
    CRect rectChannel;
    m_CaptureSlider.GetChannelRect(rectChannel);
 
    int nPos = (m_CaptureSlider.GetRangeMax() - m_CaptureSlider.GetRangeMin()) * 
               (point.x - rectClient.left - rectChannel.left) / 
               (rectChannel.right - rectChannel.left);
    m_CaptureSlider.SetPos(nPos);

	//SetCapture();
	//SetFocus();
	//LBtnValue = m_CaptureSlider.GetPos();
	/*{
		CRect rc, trc;
		m_CaptureSlider.GetChannelRect(rc);
		m_CaptureSlider.GetThumbRect(trc);
		rc.InflateRect(0, (trc.Height() - rc.Height())/2);
		if (!PtInRect(rc, point))
		return;
		LONG range = m_CaptureSlider.GetRangeMax();
		LONG pos = point.x - rc.left - trc.Width()/2;
		LONG width = rc.Width() - trc.Width();
		m_CaptureSlider.SetPos(int(DOUBLE(pos) * range / width + 0.5));
	}*/

	CPropertyPage::OnLButtonDown(nFlags, point);
}

This is a Propery page which is included in a property sheet. On that Dialog box, I am using a slider control.

Does SetCapture() and SetFocus() make any difference in OnLButtonDown().

I don't know why this handler is not getting called.?

Regards,
Mbatra

Re: OnLButtonDown not getting called for Slider Control in MFC.?

David Crow25-Jun-13 2:57

David Crow

25-Jun-13 2:57

mbatra31 wrote:

I had one issue, I don't know but the OnLButtonDown() handler is not getting called anymore.

Because it is supposed to be in a CSliderCtrl-derived class.

How to retrieve the user defined data type into main function

Manoj739019-Jun-13 22:54

Manoj7390

19-Jun-13 22:54

Hi everyone.. I have written the code for encryption algorithm. It has one user function header file also. Sample code is as shown below... I want return {Pa,C1,C2} in the program to main function. Please help me..

C++

#include <cstdlib>

#include <iostream>

#include <vector>

using namespace std;

#include <math.h>

#include "FiniteFieldElement.hpp"


namespace Cryptography

{    
    template<int P>

typedef struct {
  Cryptography::EllipticCurve<P>::Point Pa;
  Cryptography::FiniteFieldElement<P> c1;
  Cryptography::FiniteFieldElement<P> c2;
} encrypt_data_t;

        class   EllipticCurve

        {

            public:
               
                typedef FiniteFieldElement<P> ffe_t;
                
                class   Point

                {

                    friend  class   EllipticCurve<P>;

                    typedef FiniteFieldElement<P> ffe_t;

                    ffe_t  x_;

                    ffe_t  y_;

                    EllipticCurve    *ec_;

                    }

                   
     		.....
		.....
		....
		...

                };
               

                typedef EllipticCurve<P> this_t;

                typedef class EllipticCurve<P>::Point point_t;

namespace   utils

{    

}



using namespace Cryptography;

using namespace utils;


template <int P>
encrypt_data_t<P> my_encrypt()

{

    typedef EllipticCurve<263> ec_t;

    ec_t   myEllipticCurve(1,1);


   // Alice

    
    ec_t::Point Pa = a*G;  // public key

    
    // encrypt using Bob`s key

    ec_t::Point Pk = a*Pb;

    ec_t::ffe_t c1( m1*Pk.x() );

    ec_t::ffe_t c2( m2*Pk.y() );

    cout << "Encrypted message from Alice to Bob = {Pa,c1,c2} = {" << Pa << ", " << c1 << ", " << c2 << "}\n\n";

     encrypt_data_t <263> ret;
     ret.Pa = Pa;
     ret.c1 = c1;
     ret.c2 = c2;

     return ret;  
}

main()
{
 int result;
  template <int P> 
  result = encrypt_data_t<P> my_encrypt();
 }

"I want to return {Pa,C1,C2} to the main program using structures... I am getting so many errors"
"Please help me with this problem"

Re: How to retrieve the user defined data type into main function

CPallini20-Jun-13 1:57

CPallini

20-Jun-13 1:57

Quote:
I am getting so many errors

I would start fixing them (or post them here if you are unable to).

Veni, vidi, vici.

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