C / C++ / MFC

13-Oct-05 1:31

I have used a date time control in my
project which i need to get the date from
teh user ,
I get everthing fine but the date retrived
is wrong.When again i select the same date
i get the date write by the same code .
Has anyone faced such problem.

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

The NULL Developer13-Oct-05 1:35

The NULL Developer

13-Oct-05 1:35

I couldnt exactly get your problem. Maybe you should call UpdateData(FALSE) before using the associated variable.

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

ThatsAlok13-Oct-05 7:38

ThatsAlok

13-Oct-05 7:38

The NULL Developer wrote:
Maybe you should call UpdateData(FALSE) before using the associated variable.
Just a little Correction.. there is no need of use UpdateData(FALSE) on CDateTimeCtrl

"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

vikas amin13-Oct-05 20:15

13-Oct-05 20:15

Thank you Alok
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

ThatsAlok13-Oct-05 20:21

ThatsAlok

13-Oct-05 20:21

vikas amin wrote:
I found a solution to directly get the text from the date time control
with GetWindowText ();

What about calling

DWORD CDateTimeCtrl::GetTime(
   CTime& timeDest 
) const;

"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

vikas amin13-Oct-05 21:28

13-Oct-05 21:28

actually alok
I have used DateTime control as an acitveX in my MFC project.
the control is placed on on DialonBar
I got the handle to the control by using this code

CWnd* pCtrl1 = m_dlgbar.GetDlgItem(IDC_DTPICKER1);
ASSERT(pCtrl1 != NULL);

Then i tried to get the text from the Datetime control by using the
code
pCtrl1->GetWindowText (st);
but it retives not data .Do u hav any idea why
i tested this code on a Dlgbase project

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

vikas amin13-Oct-05 23:27

13-Oct-05 23:27

i actully wanted to get the window text of a control
so i created a pointer to that control .

CDateTimeCtrl * pwnd =(CDateTimeCtrl *) m_dlgbar.GetDlgItem(IDC_DATE_PICKER);

now i tired to get the window text by this but

CString st;
pwnd->GetWindowText (st);

I dont understand why this dont work ..........
do u have any idea.

Yeh actuly i got the date and time by using the

pwnd->GetTime(ct);

Thank u

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

David Crow13-Oct-05 3:27

David Crow

13-Oct-05 3:27

vikas amin wrote:
I get everthing fine but the date retrived
is wrong.

What do you mean by "wrong?" What does the code look like?

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

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 />

how to use Class matrix in VC++

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

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

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

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

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

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

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.

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

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

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

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