scrolling text - C / C++ / MFC Discussion Boards

Re: Assertion faliur when window is min and then max

Tara142-Jul-06 2:34

2-Jul-06 2:34

Thanks a lot.

Its working now.

I used GetSafeHdc() but it was still giving error. But I understood that before loding a bitmap to m_bitmap, I must free it. So I used m_bitmap.DeleteObject(); and, of course the second point that you stated.

Thanks once again.

Fortitudine Vincimus!

Re: Assertion faliur when window is min and then max

ovidiucucu2-Jul-06 21:29

ovidiucucu

2-Jul-06 21:29

Oups, I made a mistake in my previous answer.
I just have corrected it.

Also as long as we have not a CBitmap pointer, you can directly test m_hObject member instead of call GetSafeHandle, like WhiteSky already suggested.

Ovidiu Cucu
Microsoft MVP - Visual C++

Re: Assertion faliur when window is min and then max

Tara142-Jul-06 21:48

Tara14

2-Jul-06 21:48

SO, the reason that the assersion failure occurs is that when the dialog is minimised and then maximised, and the onPaint() function is called, the bitmap object tries to load an already loaded object. Is that correct?

Therefore, one must either delete the object before calling Load or check whether it is NULL, and call Load only if it is.

Fortitudine Vincimus!

Re: Assertion faliur when window is min and then max

Hamid_RT2-Jul-06 19:22

Hamid_RT

2-Jul-06 19:22

You can use

if (m_bitmap.m_hObject==NULL) <br />
m_bitmap.LoadBitmap ( IDB_MJ_SOFTWARE ) ;

whitesky

CRichEditCtrl - calculate how many visible lines?

rambuts2-Jul-06 1:11

rambuts

2-Jul-06 1:11

Hi all,

I am having trouble to calculate precisly how many visible lines (according to the font currently selected) i have in my CRichEditCtrl derived class.

here is the code snippet:

// this event is EN_CHANGE

void CMyRichEditCtrl::OnEdtChange()
{
        CDC* pDC = GetDC();
	int nTxtLen = GetWindowTextLength();
	SetSel(nTxtLen,nTxtLen);
	CHARFORMAT2 cf;
	GetSelectionCharFormat(cf);
	int nFontSize = cf.yHeight / 20;
	int nFontHeight = -MulDiv(nFontSize, GetDeviceCaps(pDC->m_hDC, LOGPIXELSY), 72);
	nFontHeight *= -1;
	ReleaseDC(pDC);
	CRect rc;
	GetRect ( rc );
	int nVisibleLines = rc.Height() / nFontHeight; 
	nVisibleLines -= 3;
	int nTotalLines = GetLineCount();
	int nDelta = nTotalLines - nVisibleLines;
        // ... do something with nDelta
}

trouble is , the calculation i get is incorrect, especially when i change the font size.....

can any1 help?

thanks in advanced

Rami

reverse of QueryDosDevice

Mila0251-Jul-06 23:52

Mila025

1-Jul-06 23:52

Hi,
I'm looking for function which works reverse of QueryDosDevice. I've got a "\\Device\\HarddiskVolume1" and I want to translate it to drive letter.

-----------
Mila

Re: reverse of QueryDosDevice

Randor 2-Jul-06 0:20

Randor

2-Jul-06 0:20

<br />
TCHAR GetDriveLetter(LPCTSTR lpDevicePath)<br />
{<br />
    TCHAR d = _T('A');<br />
    while(d < = _T('Z'))<br />
    {<br />
        TCHAR szDeviceName[3] = {d,_T(':'),_T('\0')};<br />
        TCHAR szTarget[512] = {0};<br />
        if(QueryDosDevice(szDeviceName, szTarget, 511) != 0)<br />
            if(_tcscmp(lpDevicePath, szTarget) == 0)<br />
                return d;<br />
        d++;<br />
    }<br />
    return NULL;<br />
}<br />

scrolling text

locoone1-Jul-06 22:04

locoone

1-Jul-06 22:04

im trying to make a scrolling text im using scrollwindow and it moves back and forth but when it goes from left to right if the text is say "hello" it looks like hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhello how can i get it to look right and not repeat the first letter?

Re: scrolling text

ovidiucucu2-Jul-06 2:25

ovidiucucu

2-Jul-06 2:25

To avoid such nasty hhhhhhhhhhhhhhhhhhhhheadaches, you can take a look at THIS FAQ[^]

Ovidiu Cucu
Microsoft MVP - Visual C++

Why can't this code translate VK_UP into VK_SHIFT+VK_TAB

zouchao11121-Jul-06 21:55

zouchao1112

1-Jul-06 21:55

CMyDialog::PreTranslateMessage()
{
if(pMsg->message == WM_KEYDOWN)
{
if(pMsg->wParam == VK_UP)
{
m_bUp = TRUE;
pMsg->wParam = VK_TAB;//tranlate into TAB
keybd_event(VK_SHIFT, 0, 0, 0); //press down the shift
}
else if(pMsg->wParam == VK_DOWN)
{
m_bUp = FALSE;
pMsg->wParam = VK_TAB;//tranlate into TAB
}
else
m_bUp = FALSE;
if(IsDialogMessage(pMsg))
return TRUE;
}
else if(m_bUp)
{
keybd_event(VK_SHIFT, 0, KEYEVENTF_KEYUP, 0);//Release SHIFT
m_bUp = FALSE;
}
return CDialog::PreTranslateMessage(pMsg);
}

Existing File [modified]

Moujan1-Jul-06 19:58

Moujan

1-Jul-06 19:58

Could someone tell me what open mode I can use to write data only to the end of my already created (existing) file? should I use iso::trunc?

~Moujan

-- modified at 1:59 Sunday 2nd July, 2006

Re: Existing File

Taka Muraoka1-Jul-06 20:07

Taka Muraoka

1-Jul-06 20:07

ios::app

0 bottles of beer on the wall, 0 bottles of beer, you take 1 down, pass it around, 4294967295 bottles of beer on the wall.

Awasu 2.2.2 [^]: A free RSS/Atom feed reader with support for Code Project.

Re: Existing File

Moujan1-Jul-06 20:35

Moujan

1-Jul-06 20:35

Thanks Taka,

Moujan

duplicate definitions

Moujan1-Jul-06 17:17

Moujan

1-Jul-06 17:17

Could some one tell me how I can prevent duplicate definitions in my program. I mean should I use something like #definemyClass or should I use provate keyword.

Thanks, Moujan

Re: duplicate definitions

Steve Echols1-Jul-06 18:03

Steve Echols

1-Jul-06 18:03

Typically in your .h header file you would put:

#ifndef _MY_CLASS_H
#define _MY_CLASS_H

class MyClass
{
...
};

#endif // _MY_CLASS_H

- S
50 cups of coffee and you know it's on!

Re: duplicate definitions

Moujan1-Jul-06 18:22

Moujan

1-Jul-06 18:22

Thanks for replay.

Moujan

System Wide hook for file save as dialog in All applications

Mo12341-Jul-06 6:46

Mo1234

1-Jul-06 6:46

Hi,
I am looking for System Wide hook for File Save as dialog.

What I want is to show more data inputs to enter in the dialog such as : a dropdown with some values, a date control etc.

It is not necessary it be the same dialog, it could be a new dialog all together with customized UI (preferrable) and gets some of the dropdown values from a database.

Creating the UI controls / Getting the information from database will not be issue at all.

What I am specifically looking for is how to make file save as hook, how to show a modified OR a new dialog all together (preferable) in all Apps when file save / file save as is executed ?

Have already seen the articles on System Wide hooks. They are very good but I am looking on how to do this specific application scenerio.

I will really appreciate your suggestions.

Thanks

Mo

Re: System Wide hook for file save as dialog in All applications

James Brown1-Jul-06 22:05

James Brown

1-Jul-06 22:05

Take a look at:

www.catch22.net/source[^]

I've got a sample there called 'report-view', it shows how to do a system-wide modification to all Open/Save dialogs and change the view to 'detail-view' in these windows.

James

http://www.catch22.net

Re: System Wide hook for file save as dialog in All applications

Mo12343-Jul-06 12:08

Mo1234

3-Jul-06 12:08

Thanks a lot for your response James. I downloaded the source and will have a look at it.

I also liked the content of your web site.

Mo

Label click in ListView triggers audio DLL:s?

Mattias G1-Jul-06 2:41

Mattias G

1-Jul-06 2:41

Hi all,

When I click in a label in my (heavily subclassed) ListView, I get the following DLL:s loaded:

<br />
Loaded 'C:\WINDOWS\SYSTEM32\winmm.dll', no matching symbolic information found.<br />
Loaded 'C:\WINDOWS\SYSTEM32\fireface_mme.dll', no matching symbolic information found.<br />
Loaded 'C:\WINDOWS\SYSTEM32\setupapi.dll', no matching symbolic information found.<br />
Loaded 'C:\WINDOWS\SYSTEM32\wintrust.dll', no matching symbolic information found.<br />
Loaded 'C:\WINDOWS\SYSTEM32\crypt32.dll', no matching symbolic information found.<br />
Loaded 'C:\WINDOWS\SYSTEM32\msasn1.dll', no matching symbolic information found.<br />
Loaded 'C:\WINDOWS\SYSTEM32\imagehlp.dll', no matching symbolic information found.<br />
Loaded 'C:\WINDOWS\SYSTEM32\EMGA8U2K.dll', no matching symbolic information found.<br />
Loaded 'C:\WINDOWS\SYSTEM32\version.dll', no matching symbolic information found.<br />
Loaded 'C:\WINDOWS\SYSTEM32\wdmaud.drv', no matching symbolic information found.<br />
Loaded 'C:\WINDOWS\SYSTEM32\wdmaud.drv', no matching symbolic information found.<br />
Loaded 'C:\WINDOWS\SYSTEM32\MSACM32.DRV', no matching symbolic information found.<br />
Loaded 'C:\WINDOWS\SYSTEM32\msacm32.dll', no matching symbolic information found.<br />
Loaded 'C:\WINDOWS\SYSTEM32\midimap.dll', no matching symbolic information found.<br />

The loading of the libraries takes about 1 sec, which is not acceptable. The app does not use any multimedia features, and is not based on MFC or any other framwork (pure Win32 API calls).

I have done some research, but is now totally at a loss. Any suggestions will be appreciated!

Thanks!

PS.

Fireface800 is my audio I/O unit, a beautiful piece of hardware if you ask me Smile | :)

Re: Label click in ListView triggers audio DLL:s?

Stephen Hewitt1-Jul-06 3:42

Stephen Hewitt

1-Jul-06 3:42

I would put a breakpoint inside LoadLibraryW (and friends) and try to get a call stack of the code which loads "winmm.dll".

Steve

Re: Label click in ListView triggers audio DLL:s?

Mattias G1-Jul-06 5:06

Mattias G

1-Jul-06 5:06

Good idea. Tried it, but the call stack doesn't tell me that much:

<br />
KERNEL32! 7c80acd3()<br />
COMCTL32! 5d0f0541()<br />
COMCTL32! 5d0f08a0()<br />
COMCTL32! 5d097aae()<br />
USER32! 77d48709()<br />
USER32! 77d487eb()<br />
USER32! 77d4c00e()<br />
USER32! 77d4c034()<br />
esListVw::OnMessage<br />

The bottom one is my own code, calling CallWindowProc(...) in response to a WM_LBUTTONDOWN.

Confused | :confused:

I think this is spooky. I would feel more comfortable if the app just crashed ...

Btw, tried to remove all custom stuff from the control (subclassing and responding to WM_NOTIFY's), but the multimedia DLL's get loaded anyway at first click (left or right mouse button doesn't matter, same behaviour if tabbing to the label).

Any idea on how to move forward? I'm stuck.

Thanks

Re: Label click in ListView triggers audio DLL:s?

Stephen Hewitt1-Jul-06 5:50

Stephen Hewitt

1-Jul-06 5:50

Don't use MSVC6 to get the stack. Use WinDBG. You can get it from here[^]. Configure the symbol path (in the "File" menu) with this string:
SRV*C:\Symbols*http://msdl.microsoft.com/download/symbols

You will need an internet connection. This will cause WinDBG to download symbols as needed from Microsoft and store them on your machine at "C:\Symbols". With these symbols you will get a more meaningful stack trace. You can issue the "kvn 1000" command to get a stack trace to send.

Steve

Re: Label click in ListView triggers audio DLL:s?

Mattias G3-Jul-06 1:51

Mattias G

3-Jul-06 1:51

Hehe, was hoping for that magical non-documentet extended style LVS_EX_NOAUDIO Smile | :)

The call stack looks like this:

<br />
LoadLibraryW<br />
CCPlaySound<br />
ListView_HandleMouse<br />
ListView_OnButtonDown<br />
ListView_WndProc<br />
InternalCallWinProc<br />
UserCallWinProcCheckWow<br />
CallWindowProcAorW<br />
CallWindowProcW<br />
esGridCtrl<br />

Any ideas? Have been using quite a few list views over the years, but this is a total mystery to me.

[Have been away a few days, hoping thread is not dead]

Re: Label click in ListView triggers audio DLL:s?

Stephen Hewitt3-Jul-06 3:07

Stephen Hewitt

3-Jul-06 3:07

Can you send more info. i.e. The total info when you enter "kvn 1000" in WinDBG. For examaple where in ListView_HandleMouse did CCPlaySound get called. Also if you issue the "lmv" the results would be useful.

Steve

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.