Deleting listbox item jumps to top? - C / C++ / MFC Discussion Boards

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Re: Programmatic control of mouse cursor

El'Cachubrey2-Dec-03 4:36

El'Cachubrey

2-Dec-03 4:36

See Keyboard(Mouse) Input Functions in msdn and arbitrary keybd_event & mouse_event

writing in a file

karteek2-Dec-03 0:53

karteek

2-Dec-03 0:53

Hi,

I am writing a DLL(general purpose plugin) for winamp.In this I want to write the details of the song into a file whenever the song changes. I used FILE *fp=fopen(file,"w") to open a file but it is giving errors. How should I open a file to write into?

Karteek

Re: writing in a file

BaldwinMartin2-Dec-03 1:09

BaldwinMartin

2-Dec-03 1:09

CString stmpfilename,sMyText;
tmpfilename = "C:\\my.txt";
sMyText = "Hello World\r\n";

CFile f;
if (f.Open(tmpfilename, CFile::modeCreate | CFile::modeWrite | CFile::shareDenyWrite))
{
f.Write(sMyText, sMyText.GetLength());
f.Close();
}

Best Wishes and Happy Holiday's,
ez_way

Re: writing in a file

karteek2-Dec-03 1:15

karteek

2-Dec-03 1:15

HI,

I tried CFile also.I wrote the same code and included afx.h.But it is giving errors.I included afx.h

KArteek

Re: writing in a file

judo2-Dec-03 1:53

judo

2-Dec-03 1:53

What is the exact error you got? You probably need to catch file exceptions.

Re: writing in a file

BaldwinMartin2-Dec-03 2:12

BaldwinMartin

2-Dec-03 2:12

OK This seems strange.
You said the you included afx.h

Try this please

#include <afx.h>
char* pFileName = "test.dat";
TRY
{
CFile f( pFileName, CFile::modeCreate | CFile::modeWrite );
}
CATCH( CFileException, e )
{
#ifdef _DEBUG
afxDump << "File could not be opened " << e->m_cause << "\n";
#endif
}
END_CATCH

Best Wishes and Happy Holiday's,
ez_way

Re: writing in a file

David Crow2-Dec-03 3:20

David Crow

2-Dec-03 3:20

And those compiler/linker/runtime errors are?

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?

Deleting listbox item jumps to top?

Moak2-Dec-03 0:43

Moak

2-Dec-03 0:43

Hi,
when I delete a listbox item it seams the top index is set to 0, is this a normal behaviour? Can I switch this off or is there any good workaround?

Thanks for help, Moak

Here is a little MFC code snippet to produce the effect:

<br />
BOOL CTest1Dlg::OnInitDialog()<br />
{<br />
    CDialog::OnInitDialog();<br />
<br />
    for(int t=1;t<20;++t) // fill listbox<br />
    {<br />
        CString sText;<br />
        sText.Format("listbox line %d", t);<br />
        m_list.AddString(sText);<br />
    }<br />
	m_list.SendMessage(WM_VSCROLL, SB_BOTTOM, NULL); //scroll to bottom<br />
<br />
	return TRUE;<br />
}<br />
<br />
void CTest1Dlg::OnButton1() <br />
{<br />
    m_list.DeleteString(0); //delete an entry, annoying jump to top happens here<br />
	<br />
}<br />

Re: Deleting listbox item jumps to top?

BaldwinMartin2-Dec-03 0:48

BaldwinMartin

2-Dec-03 0:48

void CYourApp::OnDelete()
{
CString tmp;
int nCurItem = m_ctrlMainList.GetCurSel();
m_ctrlMainList.GetText(nCurItem,tmp);
if (nCurItem != LB_ERR)
m_ctrlMainList.DeleteString(nCurItem);

UpdateData(FALSE);
}

Call it and see if the abhorant behavior continues.

Best Wishes and Happy Holiday's,
ez_way

Re: Deleting listbox item jumps to top?

includeh102-Dec-03 0:50

includeh10

2-Dec-03 0:50

use code as:

int iSel=m_list.GetCurSel();
//delete
m_list.SetCurSel(iSel);

includeh10

Re: Deleting listbox item jumps to top?

Moak2-Dec-03 1:00

Moak

2-Dec-03 1:00

doesn't work all the time, it requires a selected item.

Re: Deleting listbox item jumps to top?

Moak2-Dec-03 1:09

Moak

2-Dec-03 1:09

includeh10 wrote:
int iSel=m_list.GetCurSel();
//delete
m_list.SetCurSel(iSel);

how about this...
int nIndex=m_list.GetTopIndex();
m_list.DeleteString(0);
m_list.SetTopIndex(nIndex);

It will work also without selection (Sorry, BaldwinMartin I didn't understand your code). Do I really have to do this... why does deleting an item changes the position, is that a known bad Win32 behaviour?

Thanks again Smile | :)

XP style

viliam2-Dec-03 0:00

viliam

2-Dec-03 0:00

Some dialogs have new Windows XP
style - I maen buttons are not only simple
grey rectangle but they look better.
(as draw) or combo box has selection
button as blue rect and so on.
But when I am creating my dialog based
applications (in VC++ 7.1)
it still looks as Windows 98 or so on
even they run under Windows XP.

Is here any way how to turn of
this style for my application?

Thank you
Viliam

viliam

Re: XP style

Chris Morrison7-Dec-03 7:54

Chris Morrison

7-Dec-03 7:54

I assmume that what you are asking is how to enable Windows XP Visual Styles for your application, so that you dialog window is drawn in the current theme.

You will need to add a Common Controls Manifest to your application, this is a script written in XML that forces your application to use version 6.00 of the ComCtl32.dll to draw the controls and non-client areas of your windows.

This manifest can be embedded in your exe file's resources, or you can place it in the same directory as your exe file and give it the same name as your exe file with .manifest appended to the end. For example, if your exe is called MyApp.exe then you would call you manifest file MyApp.exe.manifest.

Click here[^] for further information.

Hope this helps,

Chris

Slow Editor in VC+ 6.0

BadJerry1-Dec-03 23:50

BadJerry

1-Dec-03 23:50

My C++ editor is painfully slow on a large file (13 000 lines) whenever I add a new line. Does anybody know something I can turn in or off so it would be usable?
Thanks for any advice (oh apart from breaking up the file!)

Re: Slow Editor in VC+ 6.0

VC++ Boy2-Dec-03 1:44

VC++ Boy

2-Dec-03 1:44

Is there other problems with the machine (no more disk space, etc.)?

Re: Slow Editor in VC+ 6.0

BadJerry2-Dec-03 1:56

BadJerry

2-Dec-03 1:56

I am afraid not... space on hard drives and below physical memory capacity...

Re: Slow Editor in VC+ 6.0

Brian Shifrin2-Dec-03 5:50

Brian Shifrin

2-Dec-03 5:50

1) Are you using visual assist, or any other pluggings? See if you can turn'em off improve performance...

Another option is to delete *.ncb, *.opt, *.clw... If *.opt is corrupt vc editing will be very slow.

Brian

Re: Slow Editor in VC+ 6.0

BadJerry2-Dec-03 7:11

BadJerry

2-Dec-03 7:11

Deleted the opt and it worked! Thanks a lot! I am very grateful!

key sound

viliam1-Dec-03 23:48

viliam

1-Dec-03 23:48

I have dialog based application.
And any time when I press some keyboard key
over the window it makes sound (Window sound)
Is here any way how to turn it off from program?
Thanx
Viliam

viliam

Re: key sound

David Crow2-Dec-03 9:53

David Crow

2-Dec-03 9:53

See if this helps any.

Five birds are sitting on a fence.
Three of them decide to fly off.
How many are left?

Re: key sound

viliam2-Dec-03 22:30

viliam

2-Dec-03 22:30

Thank you,
this is not exactly what I am looking for.
I didn't know this way but I cannot mute the speakers
in my application. It's already playing different audio
and problem is that I am playing audio and whan key
is pressed the key sound is mixed with my audio.
Key sound is not bothering me in time when
is nothing played - it doesn't matter in that time.

viliam

Changing COLORREF to RGB

harinat1-Dec-03 23:41

harinat

1-Dec-03 23:41

Hello Guys...

Thank you guys for the reply...
i have one more doubt...i wanna change the COLORREF item to RGB structure..ie i want the seperate values for R, G and B

Thanks in Advance,
Hariharan.S.N

Re: Changing COLORREF to RGB

Steve S1-Dec-03 23:44

Steve S

1-Dec-03 23:44

GetRValue and friends...

Steve S

Re: Changing COLORREF to RGB

BaldwinMartin2-Dec-03 1:04

BaldwinMartin

2-Dec-03 1:04

COLORREF RGB(
BYTE bRed, // red component of color
BYTE bGreen, // green component of color
BYTE bBlue // blue component of color
);

above is the structure

#define RGB(r, g ,b) ((DWORD) (((BYTE) (r) | \
((WORD) (g) << 8)) | \
(((DWORD) (BYTE) (b)) << 16)))
Above is the Macro

So COLORREF is a 24-bit RGB color.

BYTE GetBValue(
WORD rgb // 32-bit RGB value // blue
);

BYTE GetGValue(
DWORD rgb // 32-bit RGB value // green
);

BYTE GetRValue(
DWORD rgb // 32-bit RGB value // red

);

The GetRValue macro is defined as follows:

#define GetRValue(rgb) ((BYTE) (rgb))
#define GetGValue(rgb) ((BYTE) (rgb))
#define GetBValue(rgb) ((BYTE) (rgb))

long green = 128;
long red = 128;
long blue = 128;

COLORREF clr = RGB((blue + (green * 256) + (red * 255));

You may also create a structure of you own with COLORREF as a element with it.

Hope this helps.

Best Wishes and Happy Holiday's,
ez_way

Last Visit: 31-Dec-99 18:00 Last Update: 22-Sep-24 11:23

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