Re: Creating a Tree Structure - C / C++ / MFC Discussion Boards

Tim Smith24-Jan-05 4:21

24-Jan-05 4:21

If it doesn't work, then your code has other bugs in it. I know that doesn't really help you out a lot, but time and time again I see people waste time trying to figure out why the operating system isn't working when it turns out that our code just has a simple bug.

I'm not bitching at you or saying you are a bad programmer. We all do it. I recently wasted two hours trying to figure out why MFC's wait cursor wasn't working when it turned out I just forgot to specify a variable name.

i.e.

CWaitCursor;

instead of

CWaitCursor waitCursor;

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

std::out_of_range

Anonymous24-Jan-05 1:11

Anonymous

24-Jan-05 1:11

Hi,
I get this runtime error
Unhandled exception at 0x7c59bbf3 in NewMumsEngine.exe: Microsoft C++ exception: std::out_of_range @ 0x016c605c.

when I try to execute this line

sVarData = m_pElement[iPos].sValue.substr(iIndex+1);
where
sVarData is of string type.
m_pElement[iPos] is an object of a structure
sValue is another string variable in the same structure.

Can anyone please explain this error to me and tell me how to remove it.Any suggestions please?

thanks,
Arjun.

Re: std::out_of_range

Mike Dimmick24-Jan-05 1:23

Mike Dimmick

24-Jan-05 1:23

You don't say what type m_pElement is but I presume it's a pointer to a C-style array. I'd therefore guess that iIndex + 1 is greater than the length of sValue, assuming that sValue is a std::string.

You probably need to check that iIndex is less than the length of sValue before performing this operation.

Stability. What an interesting concept. -- Chris Maunder

Re: std::out_of_range

markkuk24-Jan-05 3:11

markkuk

24-Jan-05 3:11

substr() throws out_of_range when the index is beyond the end of the string. Check the iIndex value.

difference between console based programming and event based coding

phijophlip24-Jan-05 0:43

phijophlip

24-Jan-05 0:43

Hello

What is difference between console based coding and event based coding
in window platform

Frown | :(

Philip

Re: difference between console based programming and event based coding

David Crow24-Jan-05 2:38

David Crow

24-Jan-05 2:38

The former runs in a console window (as opposed to GUI), while the latter is based on events (as opposed to synchronous). They are not necessarily mutually exclusive.

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

Creating a Tree Structure

Pazzuzu24-Jan-05 0:43

Pazzuzu

24-Jan-05 0:43

Hi All,

I want to build a structure of userdefined elements,which will be having child & subchild elemetnts as well(Like a Tree Structure). Using STL or so...

Is there any build-In facility in c++,by which I could create a tree structure like this & query for elements as well, within this structure.

If not any suggestions how to proceed.....

Thanks...

Re: Creating a Tree Structure

HurricaneFlossie25-Jan-05 13:04

HurricaneFlossie

25-Jan-05 13:04

Try using an XMLDOMDoc. You can use XPath syntax to navigate the tree and find nodes. XML is a self-defining tree structure which includes it's own navigation functions. Sounds like a perfect answer to you problem.

Check out the following links.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/xmlsdk/html/xmobjxmldomdocument.asp

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/xmlsdk/html/xmrefxpathsyntax.asp

Some people see things that are and ask, Why? Some people dream of things that never were and ask, Why not? Some people have to go to work and don't have time for all that ...
Author: George Carlin

Re: Creating a Tree Structure

Pazzuzu26-Jan-05 3:58

Pazzuzu

26-Jan-05 3:58

Thanks,Will try in that direction...

Stunning GUI .. How ?

AbinThomas24-Jan-05 0:27

AbinThomas

24-Jan-05 0:27

hi,
recently i got some work which needed a good GUI. I did a lot of time googling but became even more confused. i hav seen stunning gui's like those of google's picasa, acdc6 ... How do they do it ?
Several sites advices to use a manifest file to make application Theme aware in XP. it works fine but only with Xp. should i go with using bitmaps for all the controls and dialog backgrounds, OR use a third party tool like BCG/codejock software.
I am a beginner and can anyone please give an advice on how to start with this. i am so desparate to make my controls and other parts of my application
look great. any help is highly appreciatable WTF | :WTF:

thankx,
abin

Re: Stunning GUI .. How ?

Maximilien24-Jan-05 3:07

Maximilien

24-Jan-05 3:07

application like picasa manually draw their own GUI, either by using bitmaps, or simple GDI drawing.

Doing a complete UI package for your software can be time consumming, and should only be done if it's absolutly necessary, or that you have both time and money; BUT it can be really fun to do.

Also, have a look at topics that talk about skinning application.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Multi-Language app trouble

Deian24-Jan-05 0:22

Deian

24-Jan-05 0:22

Hello,

I'm writting and app that is completely in Bulgarian language, all the resources are in Bulgarian and the program displays the cyrillic labels and messages correctly undef Windows XP but does not always display them correctly under Windows 9x/ME.

How to ensure that the cyrillic charcters will always be displayed correctly under all OS's ?

Thanks in advance!

how to change regional setting

venu_vooda23-Jan-05 22:36

venu_vooda

23-Jan-05 22:36

My application is not running in sweden,denmark where the default regional setting is set to dutch.I read in some articles that this is a bug .
And the application runs fine when regional settting is set to English(uk)

Now I want to change regional setting thru my program

will setlocale function help in this respect

Re: how to change regional setting

ThatsAlok23-Jan-05 23:47

ThatsAlok

23-Jan-05 23:47

Hello Venu!
you can use SetLocaleInfo to set Regional Setting from your program

"I Think this Will Help"
<h5
alok gupta="" <br=""> visit me at http://www.thisisalok.tk

Cross platform GUID's

Giles23-Jan-05 22:24

Giles

23-Jan-05 22:24

Anyone know of an implementation for cross platform GUID's?

Been looking into them, and they were put together by Paul Leach at Microsft, in an internet RFC, for the Network Working Group, as an alternative to UUID's.

Instead of just being a large random number (UUID's???), they consist of a time stamp, IP address, and some other stuff to guarentee unquieness, but at the same time being sortable.

Been looking around, but have not been able to find the RFC, or any implementations in C++.

I know Java has them, and Windows has them built in as well, but on Unix, its a UUID gen, which is not the same as a GUID in how it should be generated.

reading a file - one bit at a time

2000ram23-Jan-05 22:17

2000ram

23-Jan-05 22:17

I wasn't sure how to approach this, but say you have a binary file and i want to read it 1 bit at a time -- how would you read one bit at a time?

Re: reading a file - one bit at a time

toxcct23-Jan-05 22:27

toxcct

23-Jan-05 22:27

1 bit, one 1 byte ???

you have many functions to read files, but only 1 byte at least.

what you could do so is reading the byte, and exctracting its bit that's interresting you...

for example, i want the bit b4 of the first byte of the file (i consider b0 is the LSB, and b7 is the MSB) :

<font color=#0000FF>int </font>file = fopen(<font color=#808080>"file1.txt"</font>, <font color=#808080>"r"</font>);
<font color=#0000FF>char </font>cByte = 0;
fscanf(file, <font color=#808080>"%c"</font>, &cByte);
<font color=#0000FF>bool </font>bBit_b4 = (cByte & 0x10) >> 4;
<font color=#0000FF>if </font>(bBit_b4) {
    <font color=#008000>// b4 was set to 1</font>
}
else {
    <font color=#008000>// b4 was set to 0
</font>}

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

Re: reading a file - one bit at a time

2000ram23-Jan-05 23:41

2000ram

23-Jan-05 23:41

thanx!!

i am doing in a similar fashion..
i just thought if there is any direct function

Anything wrong with this?

Yulianto.23-Jan-05 22:11

Yulianto.

23-Jan-05 22:11

POSITION pos = GetFirstViewPosition();
CString temp;
while (pos != NULL)
{
CRichEditView* pView = (CRichEditView*) GetNextView(pos);

int i, nLineLength, nLineCount = pView->GetRichEditCtrl().GetLineCount();
CString strText, strLine;

// Dump every line of text of the rich edit control.
for (i=0;i < nLineCount;i++)
{
nLineLength = pView->GetRichEditCtrl().LineLength(i);
pView->GetRichEditCtrl().GetLine(i, strText.GetBuffer(nLineLength));
AfxMessageBox(strText);
strText.ReleaseBuffer(nLineLength);
}
}

I think there`s a problem with the CString allocation memory.

<italic>Work hard and a bit of luck is the key to success.

You don`t need to be genius, to be rich.

Re: Anything wrong with this?

David Crow24-Jan-05 2:42

David Crow

24-Jan-05 2:42

Yulianto AKA goodmast3r wrote:
AfxMessageBox(strText);
strText.ReleaseBuffer(nLineLength);

These two lines should be switched. Straight from MSDN:

If you use the pointer returned by GetBuffer() to change the string contents, you must call ReleaseBuffer() before using any other CString member functions.

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

Re: Anything wrong with this?

James R. Twine24-Jan-05 3:37

James R. Twine

24-Jan-05 3:37

Besides the problem mentioned with using CString::GetBuffer(...) and CString::ReleaseBuffer(...), I believe you should be using nLineLength + 1 in the call CString::GetBuffer(...) to store the line extracted from the Rich Edit control to account for the terminating NUL character.

Peace!

-=- James
Tip for inexperienced drivers: "Professional Driver on Closed Course" does not mean "your Dumb Ass on a Public Road"!
Articles -- Products: Delete FXP Files & Check Favorites

SendMessage

Yulianto.23-Jan-05 21:54

Yulianto.

23-Jan-05 21:54

In OnInitDialog() of a class which inherits from CDialog,
SendMessage(WM_CLOSE) will close the dialog, but when using
::SendMessage((HWND)(CWnd*)this,WM_CLOSE,0,0);
it couldn`t close the dialog, where did I do wrong?

<italic>Work hard and a bit of luck is the key to success.

You don`t need to be genius, to be rich.

Re: SendMessage

ThatsAlok23-Jan-05 22:21

ThatsAlok

23-Jan-05 22:21

Why Don't you try

::SendMessage(this->GetSafeHwnd(),WM_CLOSE,0,0);

::SendMessage(this->m_hWnd,WM_CLOSE,0,0);

"I Think this Will Help"
<h5
alok gupta="" <br=""> visit me at http://www.thisisalok.tk

Re: SendMessage

ThatsAlok23-Jan-05 22:22

ThatsAlok

23-Jan-05 22:22

Why Don't you try

::SendMessage(this->GetSafeHwnd(),WM_CLOSE,0,0);

::SendMessage(this->m_hWnd,WM_CLOSE,0,0);

OFFTOPIC:Yulianto AKA goodmast3r?,if you don't mind could you tell me meaning of your name Yulianto.

Thanks

"I Think this Will Help"
<h5
alok gupta="" <br=""> visit me at http://www.thisisalok.tk

Re: SendMessage

Yulianto.23-Jan-05 22:50

Yulianto.

23-Jan-05 22:50

ThatsAlok wrote:
OFFTOPIC:Yulianto AKA goodmast3r?,if you don't mind could you tell me meaning of your name Yulianto.

Ehmm, No particular meaning. I was born on July. I think it`s a bad name, but anyway it was given by my parent. And what`s the meaning of
ThatsAlok

<italic>Work hard and a bit of luck is the key to success.

You don`t need to be genius, to be rich.

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