C / C++ / MFC

Re: form background bitmap

30-May-04 16:25

See the FAQ
2.1 I'm trying to use a standard C++ library class (like cout, cin, or string) but the compiler gives an undeclared identifier error (C2065) on those names. Why?[^]

--Mike--
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form background bitmap

zubeido30-May-04 13:41

zubeido

30-May-04 13:41

Hi all!
I've been tring to put a bitmap background image on the main Dialog but nearest i can get is this:

CDC* pDC=GetDC();
CDC old; //New device context used as the source DC
//Creates a deice context compatible to pDC
old.CreateCompatibleDC(pDC);
CBitmap dlg_bmp;
CRect rect;
GetClientRect(&rect);
dlg_bmp.LoadBitmap(IDB_BITMAP3);
CBitmap* oldbmp= old.SelectObject(&dlg_bmp);
pDC->BitBlt(rect.left, rect.top, rect.Height(), rect.Width (),&old,0,0,SRCCOPY);
old.SelectObject(oldbmp);
dlg_bmp.DeleteObject(); //Deletes the bitmap
Invalidate();

when this runs the bitmap is loaded and it overrun the other controls hiding them
If some one help me i'd be very gratefull

AI_Warrior

Michael Dunn30-May-04 16:27

Re: form background bitmap

30-May-04 16:27

You need to handle WM_ERASEBKGND and paint the bitmap in response to that message.

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Aizaz31-May-04 2:14

Aizaz

31-May-04 2:14

try setting the background brush of the dialog box by usning the setclasslong method use GCL_HBRBACKGROUND as the index in the api.

funny working ListBox - help!

Anonymous30-May-04 11:46

Anonymous

30-May-04 11:46

Hi!

I have a problem with setting the character set in my ListBox (List). When I create a CFont object with a specific character set and I set that font in the Device Context recieved from the ListBox, then it is OK. I can write through that DC in the chosen charset. See Code :

CFont * font = new CFont; 
CFont *oldFont; 
CPaintDC dc( List ); 
font->CreateFont (28,0,0,0,700,0,0,0, 
	RUSSIAN_CHARSET, OUT_DEFAULT_PRECIS, 
	CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, 
	DEFAULT_PITCH|FF_DONTCARE, "Arial"); 
oldFont = dc.SelectObject( font); 
dc.ExtTextOut(10,170,0,NULL,"some text", 
strlen("some text"),NULL);

!!!!!!!!! BUT !!!!!!!!!
If I set that font right in my ListBox and want to have the text added with code :

<br />
List->SetFont( font, TRUE); <br />
List->AddString( "some other text" ); <br />

in the chosen charset, then it DOES NOT work !
However the added text has the other parameters of the chosen font ( Height and so on) but the charset is the original (standard) one
Does anyone know how to force the ListBox to accept the charset from the font also ? Or it might be a bug in my Visual Studio ?
PLEASE HELP!

Deriving Edit Box Control

Grahamfff30-May-04 11:11

Grahamfff

30-May-04 11:11

I have been trying to have an Edit Box take the Tab key as a simple move off the control - just tab around all the controls with Tabstop set.
Currently the Tab acts as an end to data input (i.e. like a Return or Enter key pressed). I did start to Derive the Edit Box control, but got stuck, see code below!

// MyEdit.cpp : implementation file<br />
//<br />
<br />
#include "stdafx.h"<br />
#include "MyEdit.h"<br />
<br />
<br />
// CMyEdit<br />
<br />
IMPLEMENT_DYNAMIC(CMyEdit, CEdit)<br />
CMyEdit::CMyEdit()<br />
{<br />
}<br />
<br />
CMyEdit::~CMyEdit()<br />
{<br />
}<br />
<br />
BEGIN_MESSAGE_MAP(CMyEdit, CEdit)<br />
 //{{AFX_MSG_MAP(CMyEdit)<br />
 ON_WM_GETDLGCODE() <br />
 //}}AFX_MSG_MAP<br />
END_MESSAGE_MAP()<br />
<br />
<br />
// CMyEdit message handlers<br />
<br />
UINT CMyEdit::OnGetDlgCode()<br />
{<br />
	//return CEdit::OnGetDlgCode() | DLGC_WANTTAB;<br />
	//return DLGC_WANTALLKEYS;<br />
	return DLGC_WANTTAB;<br />
// WHat am I doing hear!!!!<br />
}

Currently the Edit Box (MyEdit) only processes the TAB key, I want it to process all keys but with the Tab key just move on to the next tabstop.

Help!

grahamfff

C++ Launches File

vinniez_ok30-May-04 9:22

vinniez_ok

30-May-04 9:22

Lookin' for a l'il help here.
How do you launch a file from within a compiled C++ project?
I'd like my file to have a Switch where Case 1 is print this picture on the screen, Case 2 is leave program and launch a:\screensaver.exe
Is such a thing possible?
Thx

". . .gonna keep on tryin' - til I reach my highest ground"

Ravi Bhavnani30-May-04 9:45

Ravi Bhavnani

30-May-04 9:45

This will activate the currently selected screensaver:

BOOL bScreenSaverEnabled = FALSE;
BOOL bStatus = ::SystemParametersInfo
                (SPI_GETSCREENSAVEACTIVE, 0, &bScreenSaverEnabled, 0);
if (bStatus && bScreenSaverEnabled)
   AfxGetMainWnd()->SendMessage (WM_SYSCOMMAND, SC_SCREENSAVE);

[edit]
Ooops, I just re-read your post. Use CreateProcess() to execute an app from within your app.
[/edit]

/ravi

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Michael Dunn30-May-04 10:09

30-May-04 10:09

See the FAQ
6.4 How do I run another program from my program?[^]

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vinniez_ok30-May-04 13:04

vinniez_ok

30-May-04 13:04

Thanks Mike - I think I'll punt and go with WinExec().
If these are the last lines of my code:
////////////////////////
return; // return from next to last function
}
if (QuizAvg>0.79)
{
WinExec (“a:\ballfusion.exe”, SW_SHOWNORMAL );
}
Cout<< “Sorry – your score was less than 80%.”;
Clearscreen();
}
Return 0; // end of Main()
}

Do my B+ students get the executable screen saver no matter what (in a desktop setting) and my C students get the "sorry message"?
Where would the program finalize and is there good form for ending such a program that "tosses off" to another application (destructors, clearing mrmory and the like)? Thanks!

Michael Dunn30-May-04 16:30

30-May-04 16:30

You need an else block there, as it is now the "sorry" message will be printed all the time.
THe original program does not end after WinExec(), you need to do cleanup in the same way as when you don't call WinExec().

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Printing A report in A database

vinniez_ok30-May-04 17:14

vinniez_ok

30-May-04 17:14

thanks Mike - I re-read your tutorial. Some would have you avoid WinExec, but I'm a beginner and need "EZ".
So--- I follow the need for Else, I'll reverse the order so "C" students are handled first, and close out open classes & pointers prior to the IF-ELSE. But if the screensaver returns to C++ code and finds itself at a "return 0;" at the end of Main(), why won't my program end itself?
Appreciate it!

". . .gonna keep on tryin' - til I reach my highest ground"

Youngranger30-May-04 8:30

Youngranger

30-May-04 8:30

hi,
is there any way so i can print a report created in MSACCESS database through a VC++ code suppose that the report name is "report1" and it is in a database called "db1.mdb",waiting for help, thanks

how to get IDirectNotify

laia30-May-04 8:08

laia

30-May-04 8:08

i am working with a directsound program. i need IDirectNotify to place some notification when playing sound. but i found that i can't get it through the function-QueryInterface. it always fails. please help me. thanks

laia.

Re: how to get IDirectNotify

Alexander ^M.,30-May-04 11:40

Alexander ^M.,

30-May-04 11:40

HRESULT SetStopNotification(HANDLE hMyEvent, 
        LPDIRECTSOUNDBUFFER8 lpDsbSecondary)
{
  LPDIRECTSOUNDNOTIFY8 lpDsNotify; 
  DSBPOSITIONNOTIFY PositionNotify;
  HRESULT hr;

  if (SUCCEEDED(
      hr = lpDsbSecondary->QueryInterface(IID_IDirectSoundNotify8,
             (LPVOID*)&lpDsNotify))) 
  { 
    PositionNotify.dwOffset = DSBPN_OFFSETSTOP;
    PositionNotify.hEventNotify = hMyEvent;
    hr = lpDsNotify->SetNotificationPositions(1, &PositionNotify);
    lpDsNotify->Release();
  }
  return hr;
}

Don't try it, just do it! Wink | ;-)

this is my method

laia31-May-04 2:59

laia

31-May-04 2:59

I just use these codes to get it, but the QueryInterface always failed. Then I try to get the interface to the CaptureBuffer, it is ok. Why these happened?

laia

Unicode Programming

Truong D. Toan30-May-04 7:46

Truong D. Toan

30-May-04 7:46

I am programming with unicode.And I don't know how to send a character with the code > 0xFF.Anyone know it.
Thank you very much... Smile | :)

f6430-May-04 8:03

f64

30-May-04 8:03

Hi,
I don't know what do you mean with "...how to send a character..." but if what you want is assign a UNICODE character to a variable, this is how

TCHAR c = 0x0100;

Now if you are talking about UNICODE strings, use BSTR or one of the classes that encapsulate it, CComBSTR or _bstr_t.

Fabian

Truong D. Toan30-May-04 20:01

Truong D. Toan

30-May-04 20:01

Sorry for my ambiguous question.I want to send a message WM_CHAR with a code > 0xFF but when I use the following code :
wParam = 0x01ff
It send a character with code = 0xff.

f6431-May-04 8:05

f64

31-May-04 8:05

Hi,
Could you be more specific?
If I do this

TCHAR t = 0x01FF;
SendMessage(WM_CHAR, (WPARAM)t, NULL);

when I process the message I get wParam == 0x000001FF

Fabian