Want to read and write to video memory to process the display of the monitor - C / C++ / MFC Discussion Boards

vikas amin13-Oct-05 20:17

13-Oct-05 20:17

Thank you David
in the MSDN samples just search for floder named "cmnctrl1"
open the project and in the file "datetime.cpp" replace the function as below

<br />
<br />
<br />
void CDateTimePage::OnDTNotify(NMHDR *pHdr, LRESULT * pRes)<br />
{<br />
//->----declater the variable ----<br />
	CTime ct;<br />
	CString st;<br />
//->------------------------------<br />
<br />
switch( pHdr->code)<br />
	{<br />
		<br />
	case DTN_CLOSEUP:<br />
		m_lbNotifyList.AddString(_T("DTN_CLOSEUP"));<br />
		<br />
		break;<br />
	case DTN_DATETIMECHANGE:<br />
<br />
		m_lbNotifyList.AddString(_T("DTN_DATETIMECHANGE"));<br />
//->---------------------------------------------------------------------------<br />
//->this code added by Vikas Amin to display the date from the datetime control  //->in the listbox<br />
		(m_DateTime.GetMonthCalCtrl())->GetCurSel(ct);<br />
		ct.GetMonth ();<br />
		m_DateTime.UpdateData (TRUE);<br />
		st.Format(_T(" ---  %02d/%02d/%2d ---%2d"),ct.GetMonth(),ct.GetDay(),ct.GetYear(),((ct.GetDay())-12 ));<br />
		m_lbNotifyList.AddString(st);<br />
//->---------------------------------------------------------------------------<br />
		break;<br />
<br />
	case MCN_SELECT:<br />
		m_lbNotifyList.AddString(_T("asdf"));<br />
		break;<br />
<br />
	case DTN_DROPDOWN:<br />
		m_lbNotifyList.AddString(_T("DTN_DROPDOWN"));		<br />
		break;<br />
	case DTN_FORMAT:<br />
		m_lbNotifyList.AddString(_T("DTN_FORMAT"));<br />
		break;<br />
	case DTN_FORMATQUERY:<br />
		m_lbNotifyList.AddString(_T("DTN_FORMATQUERY"));<br />
		break;<br />
	case DTN_USERSTRING:<br />
		m_lbNotifyList.AddString(_T("DTN_USERSTRING"));<br />
		break;<br />
	case DTN_WMKEYDOWN:<br />
		m_lbNotifyList.AddString(_T("DTN_WMKEYDOWN"));<br />
		break;<br />
	}<br />
<br />
}<br />

The code in between the //->---- ... ... . //->-----
is added by me actully according to the theory it should display
the data in the datetime control but it displays a wrong date that
is 12 days before .

I found a solution to directly get the text from the date time control
with GetWindowText ();
but i have to parse it by my self & cannot use the direct function like GetMonth(),GetDay(),GetYear(),etc.

Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com

Re: Wrong date from CDateTimeCtl

David Crow14-Oct-05 2:44

David Crow

14-Oct-05 2:44

vikas amin wrote:
st.Format(_T(" --- %02d/%02d/%2d ---%2d"),ct.GetMonth(),ct.GetDay(),ct.GetYear(),((ct.GetDay())-12 ));
m_lbNotifyList.AddString(st);
...
but it displays a wrong date that
is 12 days before .

Do you suppose it has to do with the 12 that is being subtracted from GetDay()?

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

how to use Class matrix in VC++

chen100013-Oct-05 1:27

chen1000

13-Oct-05 1:27

hi,can you tell me how to use Class matrix in VC++,and will implement so kind of operation like mulitply,contradictorily and so on

Re: how to use Class matrix in VC++

ddmcr13-Oct-05 1:31

ddmcr

13-Oct-05 1:31

You can use CMatrix[^] class also , it supports all methods and operations you may need while working with matrices.

"Success is the ability to go from one failure to another with no loss of enthusiasm." - W.Churchill

Re: how to use Class matrix in VC++

chen100013-Oct-05 1:40

chen1000

13-Oct-05 1:40

can you give me some examples about how to use this Class CMatrix,Thank you very much.if you can provide some program about this Class ,you will make me very happy

Re: how to use Class matrix in VC++

ddmcr13-Oct-05 2:13

ddmcr

13-Oct-05 2:13

Ok I'll try to make you very happy Smile | :)

#1. Include the "matrix.h" file in you project

#2. Now for example if you want to add two matrices do following :

int main()<br />
{<br />
        //Construct 3x3 matrices<br />
        CMatrix a(3,3);<br />
	CMatrix b(3,3);<br />
	CMatrix c(3,3);<br />
<br />
	//Initialize elements of a and b matrices<br />
	for(int i=0;i<3;i++)<br />
		for(int j=0;j<3;j++){<br />
			a.SetElement(i,j,i+j);//just example<br />
			b.SetElement(i,j,i-j);//just example<br />
	}<br />
<br />
	//Add a and b matrices<br />
		c = a+b;<br />
<br />
	//Get elements of c matrix<br />
	for(int i=0;i<3;i++){<br />
		for(int j=0;j<3;j++)<br />
	            printf("%.f ",c.GetElement(i,j));<br />
	   printf("\n");<br />
	}<br />
return 0;<br />
}

All other operations you can implement similar to this , just take a good look to the link I posted .

"Success is the ability to go from one failure to another with no loss of enthusiasm." - W.Churchill

Re: how to use Class matrix in VC++

chen100016-Oct-05 0:43

chen1000

16-Oct-05 0:43

Thank you dear Giorgi,it's very kind of you,you are so wonderful.as I go over
the arithmetic of CMatrix,I found some of the functions are so abstract to understand.especially,the invert arithmetic is hard to understand,can you describe its idea for me.

Want to read and write to video memory to process the display of the monitor

dreammaker13-Oct-05 1:01

dreammaker

13-Oct-05 1:01

hi all

i need to read pixel values displayed in the monitor or Red, Green Blue values displayed and i need a method to write the altered pixel or color values back to the video memory so that ill be able to change the display of the monitor......... if someone out there knows answer in VC++ or in VB or in any other language for this functionality please give me some tips and ideas

Madhu

Re: Want to read and write to video memory to process the display of the monitor

vikas amin13-Oct-05 2:28

vikas amin

13-Oct-05 2:28

u need to use the low level
hardware interrupts
U can refer the yashwant kanitkars
book "Let us C"
try to fine the soft copy online
geting the pixel value from memory is
explained in last chapters of that book

Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com

Re: Want to read and write to video memory to process the display of the monitor

l a u r e n13-Oct-05 17:19

l a u r e n

13-Oct-05 17:19

errrr actually u need to go into directx stuff to do this
Wink | ;)

"there is no spoon"
{biz stuff} {about me}

Re: Want to read and write to video memory to process the display of the monitor

normanS13-Oct-05 19:42

normanS

13-Oct-05 19:42

With all respect to the previous replies, you certainly do not need to use assembler, and you definitely do not need to use DirectX!

Assuming you are using some Microsoft C variant, you can use the getpixel() and setpixel() functions - look them up in the help files.

To use getpixel and setpixel functions you need an hDC (handle to device context to the window or monitor), etc. Look for examples on the Microsoft MSDN site.

Re: Want to read and write to video memory to process the display of the monitor

normanS13-Oct-05 19:54

normanS

13-Oct-05 19:54

OK, some more information!

I suggest you download and have a look at the Colour Finder application, which is at http://www.codeproject.com/miscctrl/ColorFindercp1.asp[^]

To quote from the article, first a handle to the desktop device context is obtained using the API GetDCEx . This handle is then converted to a CDC class pointer using CDC::FromHandle. Then color is retrieved using the CDC method GetPixel.

I have not looked at the Colour Finder in detail, but it could be a good basis for what you want to do, and it's always easier to start with a working application, even if you throw away large bits (like tracking mouse movement, etc.) and add some bits (like changing the colour at a particular location.)

Re: Want to read and write to video memory to process the display of the monitor

dreammaker13-Oct-05 22:51

dreammaker

13-Oct-05 22:51

thanks for all your suggestions ill try em.... i tried using directX but... directX mode is initializing a blank screen and im not able to read the actual display.... ok ill try and if any one can give me some sample assembly code please get me

thanks
Madhu

want help for Dialogbar

vikas amin13-Oct-05 0:55

vikas amin

13-Oct-05 0:55

I have kept some ActiveX like a Button,
Check Box, & DateTime Control.
i get the events for the button but not
for the datetime control i dont get any
event notification or message(windows message).

Do anyone has any idea.
thank u

Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com

Self Calling function

benjnp13-Oct-05 0:53

benjnp

13-Oct-05 0:53

Can anybody show me how to create a program that will create a duplicate of your own program please? I can't figure it out. Maybe there's an API for this. thanx Smile | :)

Re: Self Calling function

Eytukan13-Oct-05 1:29

Eytukan

13-Oct-05 1:29

benjnp wrote:
I can't figure it out.

ya me too.

Every man should marry. After all, happiness is not the only thing in life.

--[v]--

Re: Self Calling function

Eytukan13-Oct-05 1:43

Eytukan

13-Oct-05 1:43

you mean the application?

Every man should marry. After all, happiness is not the only thing in life.

--[v]--

Re: Self Calling function

Fired Fish13-Oct-05 1:46

Fired Fish

13-Oct-05 1:46

duplicate of my own program ?
copy it ?

----------------------------
Jerry yu
Chinese
programming fans

Re: Self Calling function

kakan13-Oct-05 2:03

kakan

13-Oct-05 2:03

Like Unix fork?

XP versus NT

benjnp13-Oct-05 0:47

benjnp

13-Oct-05 0:47

I want to know what are the differences of Windows NT from Windows XP when in comes to affecting your application. One example is the Windows Directory of Windows NT is WINNT while WINDOWS for Windows XP.
ProcessEntry32's szExeFile works well in Windows ME and below, you'll be able to get the complete path of the file. While if you're using Windows NT and XP, you have to use ModuleEntry32 instead of ProcessEntry32 in order for you to acquire complete path of the process running on your task manager. But of course Its off the topic which covers the difference of NT over XP.
Anything else? Thanx Smile | :)

IP address

benjnp13-Oct-05 0:36

benjnp

13-Oct-05 0:36

How will I be able to get the IP address of the computer connecting to me? For example, I'm the server and there are quite a few computers that send files or interact to me. I need to get their IP address for me to use as their ID. I'm using MFC Sockets. Thanx in advance

Re: IP address

ThatsAlok13-Oct-05 1:06

ThatsAlok

13-Oct-05 1:06

benjnp wrote:
I need to get their IP address for me to use as their ID. I'm using MFC Sockets.

BOOL CAsyncSocket::GetPeerName(
CString& rPeerAddress,
UINT& rPeerPort
);

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Re: IP address

Anonymous13-Oct-05 4:04

Anonymous

13-Oct-05 4:04

The second argument of CAsyncSocket::Accept lpSockAddr is the address of a SOCKADDR structure in which you'll get the address of the connecting entity.

INI to XML conveersion (very urgent)

swaapu13-Oct-05 0:22

swaapu

13-Oct-05 0:22

Hi I am learning MFC exe application.
I have to convert ini files to xml files through my application. My sample ini file(ABCD.yak) is:

ABCD.yak

[Section1]
Key1=ABCD
Key2=20

Can anybody tell me how to convert it into an xml file using mfc.
Please tell me which functions should I make?
Thanx

Re: INI to XML conveersion (very urgent)

The NULL Developer13-Oct-05 0:39

The NULL Developer

13-Oct-05 0:39

see msxml 4.0 and dom in msdn

"Do first things first, and second things not at all."
— Peter Drucker.

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