C / C++ / MFC

22-Dec-04 8:19

Should I even bother using DrawDragRect or just write my own by using SetROP2?

DrawDragRect wouldn't draw off the window size so when I scroll up/down it won't follow along.

Someone mentioned in earlier post about using translate function for DragDractRect but I can't seem to find the function. With translation would it be possible drag a rectangle while scrolling down?

Re: Dragging rectangle

David Crow22-Dec-04 9:03

22-Dec-04 9:03

Anonymous wrote:
Someone mentioned in earlier post about using translate function for DragDractRect but I can't seem to find the function.

It's a member of the CDC class.

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

Re: Dragging rectangle

Anonymous22-Dec-04 11:45

VC6 function template problems

22-Dec-04 11:45

I have look through but I can't find the function that does the translation

Re: Dragging rectangle

John R. Shaw22-Dec-04 16:05

John R. Shaw

22-Dec-04 16:05

Hmm! I have never used DrawDragRect(), but your question implies that you have a scrolling problem and not a drawing problem. This sounds like you want the window to scroll, much like the window scrolls when you are trying to select more text (w/mouse) than you can actualy see (automatic scrolling). You have to issue the scroll command your self when the edge of the rectangle reaches the edge of the window you want it to scroll. The best way to do this, that I have used, is to start a timer and check the edge position in the timer function and have it issue the scroll commands (based on the edge position). The reason you would use a timer is because, if you do not, it would scroll way to fast.

You might look for articles on simple text editors to see how they are handling the scrolling when a user is dragging a mouse.

Good Luck!

INTP
"The more help VB provides VB programmers, the more miserable your life as a C++ programmer becomes."
Andrew W. Troelsen

peterchen22-Dec-04 7:47

peterchen

22-Dec-04 7:47

I've already found quite some "niceties" regarding VC6 and function templates (template parameter must occur as argument, and template over type rather than typename isn't resolved correctly).

I found new one, that boils down to:

<br />
template <typename CHAR, typename STRLEN> void Foo(CHAR const * p, STRLEN lenFunc, size_t charsize)<br />
{ ... };<br />
<br />
// call either:<br />
Foo("Hello", strlen, 1);<br />
// or<br />
Foo(L"Hello", wcslen, sizeof(wchar_t);<br />

I haven't reproduced this in minimum code yet, but it's pretty obvious that the compiler (sometimes) uses just the wchar_t overload for both branches.

Q:
- is this valid code under the piercing eyes of the C++ standard?
- Is this a known problem for VC6?
- Is something known about VC7 / other compilers?

we are here to help each other get through this thing, whatever it is Vonnegut jr.
boost your code || Fold With Us! || sighist | doxygen

Re: VC6 function template problems

Antti Keskinen22-Dec-04 13:04

Antti Keskinen

22-Dec-04 13:04

Are you sure that the problem is not caused by the fact that Windows headers define CHAR according if Unicode or MBCS is set ?

Try changing the typename in the template to something that is not so "reserved" as CHAR is. Like 'TYPE_CHAR' and 'TYPE_STRLEN', for example. If the compiler still produces wchar_t overloads, then it might be a bug.

As for the questions.
- Like stated, overloading the CHAR typedef can be a bad mistake. Most compilers have in-built definitions for CHAR. Many of them resolve to 8-bit integer values, but some specific compilers (such as mobile device/mobile platform ones) might produce a different result. In eyes of the C++ standard, the code is correct, though, as 'CHAR' is not a base type, but 'char' is.
- Unknown. You could try posting this as a bug suggestion to Microsoft and see what they reply. Most possibly the reply is a suggestion to move into a newer programming environment.
- Unknown. Visual Studio compilers are aimed at producing Windows and Windows Embedded code. Because ANSI/ISO Standard doesn't support stuff like multithreading, many of these compilers are not entirely standard compliant. Make no mistake, this is due to the lacking standard, not due to Microsoft's ineptness in following the standard.

-Antti Keskinen

----------------------------------------------
"If we wrote a report stating we saw a jet fighter with a howitzer, who's going to believe us ?"

-- R.A.F. pilot quote on seeing a Me 262 armed with a 50mm Mauser cannon.

Re: VC6 function template problems

peterchen22-Dec-04 19:53

peterchen

22-Dec-04 19:53

OK, I'll try renaming them (although CHAR works fine for other templates).

I'll see if I can reproduce that in VC6 in an minimum environment, and if if so, try VC7.

we are here to help each other get through this thing, whatever it is Vonnegut jr.
boost your code || Fold With Us! || sighist | doxygen

SetWindowText gives me headache

toxcct22-Dec-04 7:02

22-Dec-04 7:02

Hi everybody,

I've got a strange behavior with my code.
I have a dialog-based program, which opens another dialog (modal) when the user click on the right menu item.
There, OnInitDialog() is called before the new dialog is displayed, and it it there where I initialize my dialog depending on how the dialog was created.
I do a set of LoadString() to display the texts of the dialog in the correct language. but after loading the strings, SetWindowText() crashes.
here is the code :

Call of the new dialog :
<font color=#0000FF>void</font> CFactEditorDlg::OnFileOpen() {
    COpenFilesDlg dlg(m_strDBFile, m_strDestFile);
    <font color=#0000FF>if</font> (dlg.DoModal() == IDOK) {
        <font color=#008000>//...</font>
    }
}

New dialog's initialisation :
BOOL COpenFilesDlg::OnInitDialog() {
    CDialog::OnInitDialog();
    <font color=#008000>//...</font>
    CString strWindowText;
    strWindowText.LoadString(IDS_OFD_FACT_RECSTAT);    m_psrFact->SetWindowText(strWindowText);
    strWindowText.LoadString(IDS_OFD_DB_RECSTAT);      m_psrDataBase->SetWindowText(strWindowText);
    strWindowText.LoadString(IDS_OFD_PROMPT);          m_psFactPrompt->SetWindowText(strWindowText);
                                                       m_psDBPrompt->SetWindowText(strWindowText);
<font color=#FF0000>-></font>  strWindowText.LoadString(IDS_OFD_PREVIEW_BTN);     m_pbPreviewFact->SetWindowText(strWindowText);
    <font color=#008000>//...</font>
}

The real place having problem :
<font color=#0000FF>void</font> CWnd::SetWindowText(LPCTSTR lpszString) {
<font color=#FF0000>-></font>  ASSERT(::IsWindow(m_hWnd));

    <font color=#0000FF>if</font> (m_pCtrlSite == NULL)
        ::SetWindowText(m_hWnd, lpszString);
    <font color=#0000FF>else</font>
        m_pCtrlSite->SetWindowText(lpszString);
}

what does it mean ???
few day ago, this code was working well, and today, when i was updating another class of the program (which have no relation of any order with this one), it stops me there now...

can anyone help of any kind please ?

TOXCCT >>> GEII power
[toxcct][VisualCalc]

David Crow22-Dec-04 8:18

22-Dec-04 8:18

Is m_pbPreviewFact mapped to a valid control? In other words, you've probably got a DoDataExchange() method that looks similar to:

void COpenFilesDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialog::DoDataExchange(pDX);
    //{{AFX_DATA_MAP(COpenFilesDlg)
    DDX_Control(pDX, SOME_ID_HERE, m_pbPreviewFact);
    //}}AFX_DATA_MAP
}

Look to make sure that SOME_ID_HERE is in the project's resource.h file with a unique number, and that it is also in the dialog's template in the project's .rc file.

toxcct wrote:
few day ago, this code was working well, and today, when i was updating another class of the program (which have no relation of any order with this one), it stops me there now...

What happens if you remove this class? Does the SetWindowText() call start working again?

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

toxcct22-Dec-04 8:31

22-Dec-04 8:31

yes it does.
i put comments in the code sample, but before i do this into OnInitDialog(), I do :

pbPreviewFact = (CButton*)GetDlgItem(IDC_PREVIEW_BTN);

i don't understand... the assert failure is like pbPreviewFact is not a window, but it actually is... !
the worst is that i didn't even modify this class !!!
I was only working on another new dialog, with no relationship with this one...

TOXCCT >>> GEII power
[toxcct][VisualCalc]

toxcct22-Dec-04 8:45

22-Dec-04 8:45

i have another strange fact :
if i move the line (in my code) that is giving me an error, i still have an error at the same line !!!, that means on another code line ! Confused | :confused:

any idea ?

TOXCCT >>> GEII power
[toxcct][VisualCalc]

David Crow22-Dec-04 9:00

22-Dec-04 9:00

Comment out each of the SetWindowText() statements and recompile. Does the problem go away? If so, remove the comment from each statement individually and see which causes the problem to start.

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

Rick York22-Dec-04 13:05

Rick York

22-Dec-04 13:05

Also try "rebuild all." One of my pet peeves with VC6 is that it will not allow one to make Resource.h a dependency. That thoroughly annoys me. I can understand the rationale to not want it to be but to prohibit it from being one is stupid I think.

toxcct22-Dec-04 18:43

22-Dec-04 18:43

already done...
sorry

TOXCCT >>> GEII power
[toxcct][VisualCalc]

David Crow23-Dec-04 2:11

23-Dec-04 2:11

Rick York wrote:
One of my pet peeves with VC6 is that it will not allow one to make Resource.h a dependency.

Confused | :confused:

In all of my projects, resource.h is indeed in the dependency list. What am I missing here?

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

Phone Number Format

Anonymous22-Dec-04 6:31

22-Dec-04 6:31

Does anyone know of a good piece of code for formating phone numbers. By good, I mean formating based on country code (at the very least). Most of the hits I am seeing, on the WWW, seem to think it is pretty neat to be able to format a US phone number, but any programmer can do that (if someone cann't, there not a programmer).

Thanks for any help!

John R. Shaw
Sigh | :sigh:

"If I was at home, I would not be Anonymous."

Re: Phone Number Format

David Crow22-Dec-04 8:13

22-Dec-04 8:13

See the discussion here.

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

Re: Phone Number Format

Anonymous22-Dec-04 9:36

Scrollbar doesn't scroll all the way

22-Dec-04 9:36

Thanks David, thats about what I thought!

According to every thing I have now read even Microsoft cann't do it, except for certain countries with fixed formats (and problems may occur even for those). There is no garantee that any format will not change in the future; thereby breaking code depending on it.

John R. Shaw
Sigh | :sigh:

"If I was at home, I would not be Anonymous."

Budric B.22-Dec-04 4:49

Budric B.

22-Dec-04 4:49

Hi,
I'm havin a silly problem with a scroll bar. It works but it never scrolls all the way to the maximum range value.

For example here's the code:

<br />
		SCROLLINFO ScrollInfo;<br />
		ScrollInfo.cbSize = sizeof(ScrollInfo); <br />
		ScrollInfo.fMask = SIF_ALL;            <br />
		ScrollInfo.nMin = 0;                        <br />
		ScrollInfo.nMax = 125<br />
		ScrollInfo.nPage = ScrollInfo.nMax / 10;<br />
		ScrollInfo.nPos = 0;<br />
		ScrollInfo.nTrackPos = 0;				<br />
		m_ImageHorizontalScroll.SetScrollInfo(&ScrollInfo);	<br />
		int result = m_ImageHorizontalScroll.SetScrollPos(10);  //works<br />
		result = m_ImageHorizontalScroll.SetScrollPos(123);  //it appears to work<br />
		result = m_ImageHorizontalScroll.GetScrollPos();  //returns 113!!!  Where's the 123?<br />

So I have to set the nMax to my value + a fudge number? What should that number be?
Thanks.

Changing screen resolution in windows xp

Mohammad A Gdeisat22-Dec-04 4:41

Mohammad A Gdeisat

22-Dec-04 4:41

I have this code to change screen resolution, and it works for win98/2000

but it does not work for WinXP knowing that i log in as Administrator.

<br />
	DEVMODE dm;<br />
	dm.dmFields=DM_PELSWIDTH|DM_PELSHEIGHT;<br />
	dm.dmPelsHeight=600;<br />
	dm.dmPelsWidth=800;<br />
	ChangeDisplaySettings(&dm,0);

can anybody tell me whats wrong with this code, or another way that may work?

thanx all
Mohammad

A candle looses nothing by lighting another candle

Re: Changing screen resolution in windows xp

David Crow22-Dec-04 5:07