C / C++ / MFC Discussion Boards

paulb29-Jan-03 19:12

29-Jan-03 19:12

If I have a double type field in a jet database and the value 8.95 stored in it then when I retrieve it from the database as a string representaion it gives me "8.9499999999999993"

Is this just because the double type cannot represent the value 8.95 exactly? I have noticed that not all values come back as a huge string, e.g. 10.99, 1.95, and 8.5 are all exactly as entered. Or is it a bug with the code in the database driver that is doing the conversion?

Re: Precision of double type

Chris Richardson29-Jan-03 19:49

Chris Richardson

29-Jan-03 19:49

Binary representations of floating point numbers are pretty interesting. If you read the link below, you can see that IEEE floating point numbers can't represent 1/10 exactly, which you would think is strange, but since it's represented in binary, isn't so strange. Anyways, I don't have the answer to your question, but I bet somewhere in the MSDN does (maybe even the link below?).

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore/html/_core_IEEE_Floating.2d.Point_Representation_and_Microsoft_Languages.asp[^]

Chris Richardson

Programmers find all sorts of ingenious ways to screw ourselves over. - Tim Smith

Setting Bitmap Background for CProgressCtrl

Effiniti29-Jan-03 18:09

Effiniti

29-Jan-03 18:09

Does anyone know the technique to allow a background bitmap to be displayed for a CProgessCtrl.

Specifically what functions to override and implement. I think it is not possible to use DrawItem unless you make CProgressCtrl to be Owner Drawn.

Many Thanks In Advance

Re: Setting Bitmap Background for CProgressCtrl

Abbas_Riazi29-Jan-03 22:12

Abbas_Riazi

29-Jan-03 22:12

Hi,
I dont know can implement this technique or not? But this is an idea:
1- Create a PictureBox control to show your bitmap
2- Use SetParent API function to change parent of PictureBox control.
3- Set your ProgressBar control as parent of bitmap PictureBox.

A. Riazi

Visual C++ terms and agreements

moraalg29-Jan-03 16:52

moraalg

29-Jan-03 16:52

i have KaZZA and i was wondering if it's legal if i download a version of Visual C++ 6.0, if i did would i be able to register it without WINDOWS coming and knocking on my door telling me to give it up, lol

Re: Visual C++ terms and agreements

Christian Graus29-Jan-03 18:09

Christian Graus

29-Jan-03 18:09

Behold, this years winner in the 'stupidest man of the year contest'.

Yeah, it's legal, just send your details to piracy@microsoft.com and they will fix you up.

Christian

No offense, but I don't really want to encourage the creation of another VB developer.
- Larry Antram 22 Oct 2002

C# will attract all comers, where VB is for IT Journalists and managers - Michael
P Butler 05-12-2002

It'd probably be fairly easy to make a bot that'd post random stupid VB questions, and nobody would probably ever notice - benjymous - 21-Jan-2003

special .lnk files

Hervorzaubern29-Jan-03 14:01

Hervorzaubern

29-Jan-03 14:01

I am attempting to programmatically create a copy of a shortcut using the IShelllink interface. When I interogate most *.lnk files, the GetPath function returns a true target ie. "C:\Program Files\Adobe\Acrobat 5.0\Reader\AcroRd32.exe". There are some special shortcuts however, that behave differently. For example, a shortcut to MS Word returns the
C:\windows\installer\{ some guid }\wordicon.exe. from the GetPath function.

How can I determine the true target (ie: winword.exe ) given the information from the IShelllink functions?

Any suggestions?

Re: special .lnk files

C^hris L^osinger29-Jan-03 14:19

C^hris L^osinger

29-Jan-03 14:19

from http://www.codeproject.com/editctrl/dropedit.asp[^]

CString ExpandShortcut(CString &inFile)
{
	CString outFile = "";
	
    // Make sure we have a path
    ASSERT(inFile != _T(""));
	
    IShellLink* psl;
    HRESULT hres;
    LPTSTR lpsz = inFile.GetBuffer(MAX_PATH);
	
    // Create instance for shell link
    hres = ::CoCreateInstance(CLSID_ShellLink, NULL, CLSCTX_INPROC_SERVER,
        IID_IShellLink, (LPVOID*) &psl);
    if (SUCCEEDED(hres))
    {
        // Get a pointer to the persist file interface
        IPersistFile* ppf;
        hres = psl->QueryInterface(IID_IPersistFile, (LPVOID*) &ppf);
        if (SUCCEEDED(hres))
        {
            // Make sure it's ANSI
            WORD wsz[MAX_PATH];
            ::MultiByteToWideChar(CP_ACP, 0, lpsz, -1, wsz, MAX_PATH);
			
            // Load shortcut
            hres = ppf->Load(wsz, STGM_READ);
            if (SUCCEEDED(hres)) {
				WIN32_FIND_DATA wfd;
				// find the path from that
				HRESULT hres = psl->GetPath(outFile.GetBuffer(MAX_PATH), 
					MAX_PATH,
					&wfd, 
					SLGP_UNCPRIORITY);
				
				outFile.ReleaseBuffer();
            }
            ppf->Release();
        }
        psl->Release();
    }
	
	inFile.ReleaseBuffer();
	
	// if this fails, outFile == ""
    return outFile;
}

A | B - it's not a choice.

ThumbNailer

Re: special .lnk files

30-Jan-03 5:41

We actually do just what is described above. We are interogating the Microsoft Word.lnk file ( the shortcut installed in the Documents and Settings\AllUsers.Windows\StartMenu\Programs\Office\Microsoft Word.lnk). The problem is, the IShellLink->GetPath function returns C:\windows\installer\{ GUID }\wordicon.exe . But we all know that when a user runs Microsoft Word, the process running is called winword.exe. How does the system launch winword.exe when the shortcut target is wordicon.exe ? Smile | :)

Re: special .lnk files

Hervorzaubern30-Jan-03 5:42

Hervorzaubern

30-Jan-03 5:42

clistctrl in report mode: make the header not clickable.

trustno129-Jan-03 14:01

trustno1

29-Jan-03 14:01

hi,

how do you make the header, in report mode(list control), not clickable?

thx in advance!

Re: clistctrl in report mode: make the header not clickable.

Michael Dunn29-Jan-03 14:51

Michael Dunn

29-Jan-03 14:51

Add the LVS_NOSORTHEADER style to the list.

--Mike--
Looks like I picked the wrong week to stop sniffing glue.
1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

LAN connection test

Paul M Watt29-Jan-03 13:35

Paul M Watt

29-Jan-03 13:35

What is the best and/or the most reliable method of testing of a LAN is connected to the Internet.

The Wininet APIs make it easy to tell if the user is connected to a dialup modem, and a LAN, but there is no direct way to tell if the LAN is connected to the Internet.

Sending an IMCP packet is not a possibility, other than that I am open to your suggestions.

Thanks

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

Re: LAN connection test

Mike Nordell30-Jan-03 21:22

Mike Nordell

30-Jan-03 21:22

Paul Watt wrote:
What is the best and/or the most reliable method of testing of a LAN is connected to the Internet.

To try to connect to a (few) known high-uptime site(s)?

Adding color to a row in a list control

ElizabethC29-Jan-03 12:56

ElizabethC

29-Jan-03 12:56

I want to give color red for status = "Late", and blue for status = "Assigned" for each row in a list control. I tried ON_NOTIFY as suggested by many programmers found from www.google.com. But I can't get it to work. Here is the ON_NOTIFY function:

BOOL CProjectSearchView::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult)
{
NMHDR *p = (NMHDR*) lParam;
//take the default processing unless we set this to something else
if (p->code == NM_CUSTOMDRAW)
{
if (m_pSet->m_STATUS == "LATE")
{
*pResult = CDRF_DODEFAULT;
NMLVCUSTOMDRAW* lvcd = (NMLVCUSTOMDRAW*)p;
if (CDDS_PREPAINT == lvcd->nmcd.dwDrawStage)
{
*pResult = CDRF_NOTIFYITEMDRAW;
}
else if (CDDS_ITEMPREPAINT == lvcd->nmcd.dwDrawStage)
{
//this is the prepaint stage for an item
COLORREF crText;
crText = RGB(255, 0, 0);
//store the color back in the NMLVCUSTOMDRAW struct
lvcd->clrText = crText;
//tell windows to paint the control itself
*pResult = CDRF_DODEFAULT;
}
}
}

return CRecordView::OnNotify(wParam, lParam, pResult);
}

-Elizabeth

Eilzabeth

Re: Adding color to a row in a list control

Michael Dunn29-Jan-03 13:36

Michael Dunn

29-Jan-03 13:36

Don't call the base class OnNotify(), it's wiping out the return value you store in pResult.

--Mike--
Looks like I picked the wrong week to stop sniffing glue.
1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
My really out-of-date homepage
Sonork-100.19012 Acid_Helm

Re: Adding color to a row in a list control

ElizabethC30-Jan-03 11:44

ElizabethC

30-Jan-03 11:44

I got it working now. I created a custom draw handler by following the tutorial in http://home.inreach.com/mdunn/code/LVCustomDraw/LVCustomDraw.html.

Handler
ON_NOTIFY(NM_CUSTOMDRAW, IDC_PROJECT_LIST, OnCustomdrawProjectList)

Prototype
afx_msg void OnCustomdrawProjectList(NMHDR* pNMHDR, LRESULT* pResult);

-Elizabeth

Eilzabeth

AfxMessageBox: change the font size for the input string..

trustno129-Jan-03 11:52

trustno1

29-Jan-03 11:52

hi,

when i create a message box using afxmessagebox, can i get afxmessagebox to display the input string(the 1st parameter) in different font, size and color?

thx in advance!

Re: AfxMessageBox: change the font size for the input string..

Shog⁹29-Jan-03 12:21

Shog⁹

29-Jan-03 12:21

Check out ClsMessageBox, part of Jan van den Baard's ClassLib[^].

---

Shog⁹
I see the way the salesmen stare into the sun
I stood and watched them as they fell off one by one...

Windows XP Home or Professional?

Jon Sagara29-Jan-03 9:46

Jon Sagara

29-Jan-03 9:46

NetServerGetInfo allows you to get the version information for a computer on a network, however, it doesn't seem to have a method for returning the suite information.

For example, both XP Home and Professional return the 5.1 as their version number, but unlike the GetVersionEx, NetServerGetInfo doesn't return a suite mask.

So, how do you differentiate between the two when getting their information over the network?

Jon Sagara

Hi! I'm Melanoma, Moley Russell's wart.
-- Uncle Buck

Re: Windows XP Home or Professional?

Navin29-Jan-03 11:03

Navin

29-Jan-03 11:03

Huh? XP Home and XP Professional are different?
Big Grin | :-D

You can pick your friends, and you can pick your nose, but you can't pick your friend's nose.

Re: Windows XP Home or Professional?

Jon Sagara29-Jan-03 11:11

Jon Sagara

29-Jan-03 11:11

Yes. XP Home doesn't have domain support, therefore, our product doesn't support it.

Jon Sagara

Hi! I'm Melanoma, Moley Russell's wart.
-- Uncle Buck

Re: Windows XP Home or Professional?

ColinDavies29-Jan-03 22:15

ColinDavies

29-Jan-03 22:15

Jon Sagara wrote:
So, how do you differentiate between the two when getting their information over the network?

Jon, I don't think it's possible.
I don't have either about to test on, but I think you have found a genuine glitch.
I think that "Windows Server 2003" will probably identify itself differently. (I hope)
The only other way I guess is to test if something fails to run on the Home "Suite".

Regardz
Colin J Davies

Sonork ID 100.9197:Colin

You are the intrepid one, always willing to leap into the fray! A serious character flaw, I might add, but entertaining.
Said by Roger Wright about me.

Re: Windows XP Home or Professional?

Jon Sagara30-Jan-03 5:16

Jon Sagara

30-Jan-03 5:16

Argh.

Oh well. Time for my morning cup of Java | [Coffee]

. Thanks for the response. Smile | :)

Jon Sagara

Hi! I'm Melanoma, Moley Russell's wart.
-- Uncle Buck

Re: Windows XP Home or Professional?

Mike Nordell30-Jan-03 21:24

Mike Nordell

30-Jan-03 21:24

Isn't there some Wnet* function for this? Something like WnetGetInfoNnn?

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