C / C++ / MFC Discussion Boards

jschacker5-Sep-00 5:17

5-Sep-00 5:17

If you really want to do it without any wraper classes (i.e. MFC), get a few books like, "Windows 2000 Programming from the Ground Up" by Herbert Schildt. Herbert likes to hand crank all his stuff and will have examples on how to handle the messaging and window creation.

If you just want less complicated CWnd objects you can create a MDI application without the Document/View Architecture. This gives you the CView without the attached CDocument.

Unless you want to be able to use different compliers to compile your code, I would use window wraper classes for my development. They do make life easier.

Good Luck,
Jonathan Craig

Re: MDI app without MFC?

Sam Hobbs7-Sep-00 18:49

Sam Hobbs

7-Sep-00 18:49

Have you looked in the SDK samples? I would be quite surprised if there are not any samples there. Also I think that the Platform SDK documentation that describes MDI programs would at least have peices of a sample.

Re: MDI app without MFC?

Scott Leonard8-Sep-00 5:00

Scott Leonard

8-Sep-00 5:00

YES, you can. It's called WTL (Windows Template Library). It's on the Platform SDK, and it's great. You can create full-featured apps without MFC bloat and no dependencies.

Function for Converting a CString/char* to UTF-8?

Uwe Keim1-Sep-00 9:56

Uwe Keim

1-Sep-00 9:56

I tried the WideCharToMultiByte function but it seems that I have no success.

I'm trying to write an XML file.

Re: Function for Converting a CString/char* to UTF-8?

Michael Dunn1-Sep-00 20:10

Michael Dunn

1-Sep-00 20:10

Uwe, here's a UTF for Linux FAQ that talks about decoding UTF-8. It should give you a start regarding going the other way.

Here's a Google search that will give you some more stuff to look at. Smile | :)

Re: Function for Converting a CString/char* to UTF-8?

Uwe Keim1-Sep-00 23:32

Uwe Keim

1-Sep-00 23:32

Thank you very much, Mike!

I'll post a solution as soon as I figured it out. Maybe it will help others.

Solution FOUND: Function for Converting a CString/char* to UTF-8?

Uwe Keim2-Sep-00 1:24

Uwe Keim

2-Sep-00 1:24

After mailing with Markus Kuhn, the author of www.cl.cam.ac.uk/~mgk25/, he told me the following solution (function 1), which I wrapped a little bit (function 2):

// Convert a Latin-1 string to UTF-8.
// from xterm sources.
// t: output, s: input, len: input length.
// returns length of output.
static int Latin1toUTF8(TCHAR *t, const TCHAR *s, int len)
{
    const TCHAR *p = s;
    TCHAR *q = t;
    while (p < s + len) {
        if ((*p & 0x80) == 0) {
            *q++ = *p++;
        } else {
            *q++ = 0xC0 | ((*p >> 6) & 0x3);
            *q++ = 0x80 | (*p & 0x3F);
            p++;
        }
    }
    return q - t;
}

// MFC-wrapper for Latin1toUTF8.
void StringToUTF8( const CString& input, CByteArray& output )
{
	output.RemoveAll();

	if ( input.IsEmpty() )
		return;

	output.SetSize(input.GetLength()*6);	// prepare for worst-case.
	const int new_length = Latin1toUTF8( (TCHAR*)output.GetData(), input, input.GetLength() );

	ASSERT(new_length<=output.GetLength());
	output.SetSize(new_length);
}

Thanks to Markus!

CComboBoxEx and LimitText

David Saulnier1-Sep-00 8:49

David Saulnier

1-Sep-00 8:49

Anyone know how I can allow the user to enter a string wider than the edit portion of the CComboBoxEx? I've tried LimitText which works if I set it to a low number like 5. However, if I set it to a high number like 1024 or even 50 it doesn't take. I saw the comment in the MSDN about having to set the style to CBS_AUTOHSCROLL and tried that but still haven't gotten any luck.
TIA,
Dave Saulnier
CADKEY Corporation

IDE and Windows 2000 Problems

arf1-Sep-00 5:52

arf

1-Sep-00 5:52

Has anyone else noticed new problems with VC++ 6 after moving from NT4 to W2K?

I got a new system with W2K and after installing VC++ 6 the IDE now has a few small but very annoying problems that I don't recall from the NT4 days. I haven't yet applied SP4 because of MS' terrible track record with service packs. I thought I'd wait a few months to see if there wer any problems. Anyway, the problems are:

1. Cut and paste of code doesn't always work. You can select the text then hit CTRL-C but the IDE WILL NOT paste it into the new location no matter how many times I try. Repeatedly re-selecting and re-copying doesn't do anything. However, if I change my copy selection just by one character it works just fine!

2. When trying to save a modified source file, which is part of a loaded project, the IDE will tell me that the file cannot be saved (I forget the exact error). But if I try again, almost immediately, the file saves just fine. It's like there are two threads working with the file but they don't have any cooperation.

3. The IDE will periodically crash when I hit F7 to rebuild. This was so rare under NT4 that I was really surprised when it began happening under W2K.

4. After doing a cut/copy or paste the IDE gets stuck in selection mode. That is, the last location of the carat becomes the start of a text selection and wherever you move the carat to becomes the end of the selection. No amount of ESC, CTRL-C or anything will get it out of this selection mode. I got really pissed and wiped my hands over the entire keyboard several times, like you would a piano keys, and the all went back to normal. That is now how I fix it. It sounds like I'm beating the sh*t out of my keyboard Smile | :)

!!!

Re: IDE and Windows 2000 Problems

Paolo Messina1-Sep-00 10:01

Paolo Messina

1-Sep-00 10:01

I experienced what you say at point 4, but just one time.
I remember that selecting other text saved me from that trouble.
Never experienced the other points, however, maybe point 2 but one or two times.
I can't say why...

Cheers,
Paolo.

Re: IDE and Windows 2000 Problems

David Wulff1-Sep-00 14:36

David Wulff

1-Sep-00 14:36

Interesting, I though this was just me...

I am getting 1 very frequently, which is extremly annoying. I usually can't get pasting to work untill I have made a sucessfull paste outside of the IDE. I have absolutely no idea why this is.

I have never experienced 2 or 3, but 4 is also trur for me, though not just after attempting to copy.paste. Sometrimes the selection will just remain untill I reopen the source file.

I alos get another problem though, which is that the IDE VERY frequently stops responding for about 20 - 60 seconds, and then resumes. This is not during compile time, ubut while editing files. I have been told many approaches to solve this, but none have worked. Maybe it is because I have too many include directories set up, and VC++ uses a timer to update intellisense or something?...

Oh yeah, I am also using Windows 2000, the profesional edition, and didn't have these problems with NT4.

Sorry for my spelling

David Wulff1-Sep-00 14:38

David Wulff

1-Sep-00 14:38

Opps, I have very bad spelling which is obvoius from my last reply.

Sorry.

Re: IDE and Windows 2000 Problems

arf2-Sep-00 9:55

arf

2-Sep-00 9:55

I also encounter IDE pauses frequently but they are usually no longer than 2 or 3 seconds.

You didn't say what kind of system you had, buy my system is a 800 MHz P3 it may be fast enough to make the pause less noticible.

You are probably right about the delays being caused by intellisense. I thought about turning it off until it dawned on me how much I use it

Re: IDE and Windows 2000 Problems

David Wulff2-Sep-00 11:11

David Wulff

2-Sep-00 11:11

I don't think my system has much to do with it, before the move to Windows 2000, I was using a dual P2 450 with 128 MB RAM (NT4 SP3), but now I have a dual PIII 650 machine, with 512 MB RAM.

I also can't live without intellisense, it would require learning a hell of a lot about MFC that I don't want to, and don't have the time to.

Re: IDE and Windows 2000 Problems

Ronald L. Russell Jr. (Ron)5-Sep-00 3:28

Ronald L. Russell Jr. (Ron)

5-Sep-00 3:28

I have experienced (1), (2), and (4) on both NT4.0 SP 6.0a and Win2000 SP1. I have never experienced 3 on either operating system. I was really hoping that DevStudio SP4 would fix (1) because that is the problem I see most frequntly.

Re: IDE and Windows 2000 Problems

arf5-Sep-00 5:42

arf

5-Sep-00 5:42

You said that you were hoping VCPP SP4 would fix the problem, did it?

*** Dialog Box of Open & Save ******

Steve Lai1-Sep-00 5:39

Steve Lai

1-Sep-00 5:39

Hi Everyone,

How do I get the dialog box of Open & Save to come up?? (like the ones you see when you want to open and save a document in Microsoft Words).

I tried using CFileDialog but I'm having trouble. I'm not sure if I'm putting the wrong things in the parameter or what. I also get this error message of "failed assertion".

If anyone have any codes on an example of how to get the dialog box to work, please let me know.

Thanks in Advance!

Steve

Re: *** Dialog Box of Open & Save ******

Paolo Messina1-Sep-00 10:16

Paolo Messina

1-Sep-00 10:16

Hi Steve,

That should be pretty simple:

CString filename;
CFileDialog opendlg(TRUE, NULL, NULL, OFN_HIDEREADONLY,
    _T("Text files|*.txt;*.doc|Images|*.bmp;*.gif||"));
if (opendlg.DoModal() == IDOK)
    filename = opendlg.GetPathName()

This code works for a single selection dialog. At the end you have the complete name of the selected file in the filename variable.
This should help you getting started, but refer to MSDN for a complete explanation.

Cheers,
Paolo.

Replacement funtion for GetDIBits()-Please Help

Shiv31-Aug-00 22:42

Shiv

31-Aug-00 22:42

I am using GetDIBits()
function for a Win NT VC++ application
I need to use it for a Ce application but the function
GetDIBits()
is not available for CE.
So please suggest a replacement function
or an alternative approach
Thanks in advance

Re: Replacement funtion for GetDIBits()-Please Help

jschacker1-Sep-00 10:56

jschacker

1-Sep-00 10:56

I found the article, "A DIBSection wrapper for Win32 and WinCE", at http://codeguru.earthweb.com/ce/DIBSectionCE.shtml

It may help with DIBs under Windows CE.

gl
Jonathan Craig

Memory leak detection tool

Øyvind Bratland31-Aug-00 22:16

Øyvind Bratland

31-Aug-00 22:16

Where can I get a freeware memory-leak detection tool, like the (more advanced) Boundschecker?

Re: Memory leak detection tool

Alex Gorev1-Sep-00 5:35

Alex Gorev

1-Sep-00 5:35

Hi,

I've never heard about free tools like this...
BoundsChecker is a good staff and it worth spending money.

Regards,
Alex Gorev,
Dundas Software.

Re: Memory leak detection tool

roger C1-Sep-00 10:34

roger C

1-Sep-00 10:34

Or he could set out to write his own... not that I would recomend it...

Re: Memory leak detection tool

Michael Dunn1-Sep-00 14:16

Michael Dunn

1-Sep-00 14:16

If you are using MFC, MFC has built-in leak detection. It's not exhaustive, but it's free and already available.

Read up on CMemoryState and AfxEnableMemoryTracking().

How to debug in release mode

tomer dror31-Aug-00 21:25

tomer dror

31-Aug-00 21:25

Hi,
I want to debug my application in release mode
,added debug info into the release,
which tool allow me to view more that just assembley when
running it on the client machine

dr. watson...?,windbg...?
what should i do .???

thanks

tomer

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