Re: Loop error - C / C++ / MFC Discussion Boards

ThatsAlok22-Feb-06 3:11

22-Feb-06 3:11

renuchandran wrote:
now i am sending with the help of Outlook exp config using vc++i need a code which is not depand on any extra tools

http://www.codeproject.com/internet/csmtpconn.asp[^]

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

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

Using Base Classes

Desmond Mardle21-Feb-06 5:13

Desmond Mardle

21-Feb-06 5:13

Hello.
Can any one help. I am writting a application which has a dialog which is used to display a database. I have derived the dialog from the from the base class
containing the data. I can access the data as exspected. The problem is I need to call the dialog from the base class. Is this possible using this method.

Or do I have setup a pointer to the dialog in the base class and copy all the data to dialog befor I call it as I have done in the past.

Thanks for any help
Desmond Mardle

Re: Using Base Classes

David Crow21-Feb-06 5:33

David Crow

21-Feb-06 5:33

Your dialog class is derived from CDialog, and your record set class is derived from CRecordset. Is that correct?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

Re: Using Base Classes

Desmond Mardle21-Feb-06 6:29

Desmond Mardle

21-Feb-06 6:29

Thanks For your replay. I have sorted it. I am not using CRecordset. I am using my own class.

I have set a pointer from my data class to the dialog. I transfer the data. Then call the dialog. I'm not using my data class as the base class of the dialog any more.

Regards
Desmond Mardle

Re: Using Base Classes

David Crow21-Feb-06 7:11

David Crow

21-Feb-06 7:11

Desmond Mardle wrote:
I am not using CRecordset. I am using my own class.

Which connects to your data source how?

Desmond Mardle wrote:
I'm not using my data class as the base class of the dialog any more.

That's good because it probably never should have been.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

Re: Using Base Classes

Bob Flynn21-Feb-06 5:39

Bob Flynn

21-Feb-06 5:39

In the general sense, you would not want to do what you are saying (access a derived class from a base class). In fact when you say

Desmond Mardle wrote:
Or do I have setup a pointer to the dialog in the base class and copy all the data to dialog befor I call it as I have done in the past.

it appears that you do not need need to access the derived class from the base class, but rather you are having some other issue.

All of that being said, I am not sure that I grasp the problem you are describing. But from the information you have provided, I think this article may be of assistance. It describes separation of the database and the view of the database in the context of the model-view-controller design pattern. http://www.codeproject.com/gen/design/MVC1.asp[^]

Loop error

Deviantizh21-Feb-06 5:11

Deviantizh

21-Feb-06 5:11

hi. im new to vc++ and i need some help. im tryin to break a string into tokens, but the problem is that this loops runs one time more then it is supposed to .e.g. for a string with 4 tokens it runs 5 times on the 5th run it displays an empty message box and then i get "debug assertion failed" and something about Expression iStart>=0.
if i remove the while it runs once but without the error.

//m_LineList is a CStringList
POSITION pos = m_LineList.GetHeadPosition() ;
int strpos = 0;
CString str;
str = m_LineList.GetNext( pos );
CString temp="";
while ( str != '\0')
{
temp = str.Tokenize( "," , strpos );
MessageBox(temp);
};

Re: Loop error

David Crow21-Feb-06 5:37

David Crow

21-Feb-06 5:37

Deviantizh wrote:
while ( str != '\0')

What's this? I seriously doubt you'll be able to successfully make this comparison. Use the IsEmpty() method instead.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

Re: Loop error

Joe Woodbury21-Feb-06 5:49

Joe Woodbury

21-Feb-06 5:49

I don't think the original string is modified by Tokenize, thus checking it will not work. You could check the return for an empty string, but you could have empty tokens. Off the top of my head, I'd suggest testing strpos (this solution was not tested; it's just a quick guess):

CString temp;<br />
while (strpos < str.GetLength())<br />
{<br />
   temp = str.Tokenize(",", strpos);<br />
   MessageBox(temp);<br />
}

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

-- modified at 11:49 Tuesday 21st February, 2006

Re: Loop error

Deviantizh21-Feb-06 6:05

Deviantizh

21-Feb-06 6:05

thanx ill try that out Smile | :)

Re: Loop error

Deviantizh21-Feb-06 6:18

Deviantizh

21-Feb-06 6:18

the problem is that
pos is set to -1 if no more separators can be found.
the solution u proposed works for that simple loop but in the following code it after displaying the entire row(all the tokens) the application hangs. can you please figure out why that is ?

while(pos != NULL)//while thr is data present
{
//MessageBox(m_LineList.GetNext( pos ));
str = m_LineList.GetNext( pos );
while( str != '\0' )//while not end of string
{
for(int i=1;i

Re: Loop error

Joe Woodbury21-Feb-06 7:23

Joe Woodbury

21-Feb-06 7:23

str will never be modified, you have an endless loop.
the atoi line is converting str, not temp.
atoi is converting string to intenger, not float
you aren't checking strpos.

The code doesn't make much sense since the outer loop implies you have multiple matrices, which you clearly don't. Are you tring to read a row at a time, or all the rows as one string? If the latter, you need to change the scope of your loops. I'll leave that as an excercise for you.

while(pos != NULL)<br />
{<br />
  CString str = m_LineList.GetNext(pos);<br />
  int strpos = 0;<br />
<br />
  for(int i = 1; i < 3 && strpos >= 0; i++)<br />
  {<br />
    for (int j = 1; j < 3 && strpos >= 0; j++)<br />
    {<br />
      CString temp = str.Tokenize( ", " , strpos );<br />
      if (strpos >= 0)<br />
      {<br />
        simmatrix[i][j]= temp.IsEmpty() ? 0.0f : (float) atof(temp);<br />
        MessageBox(temp);<br />
      }<br />
    }<br />
  }<br />
}

If you put this in a function, you could simplify the strpos tests.

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

Re: Loop error

Deviantizh22-Feb-06 2:03

Deviantizh

22-Feb-06 2:03

thanks, got the stuff workin

Modify the color of the scrollbar in Visual C++

Junyor21-Feb-06 4:50

Junyor

21-Feb-06 4:50

I was wondering if I can modify the colors of the scrollbars of some text boxes...something similar to what CSS does in HTML. Because this would make my application more interesting.
in css the code would be

scrollbar-face-color:005585;<br />
	scrollbar-highlight-color:005585;<br />
	scrollbar-3dlight-color:005585;<br />
	scrollbar-shadow-color:005585;<br />
	scrollbar-darkshadow-color:FFFFFF;<br />
	scrollbar-arrow-color:FFFFFF;<br />
	scrollbar-track-color:FFFFFF;

This code modifies the color of the scrollbars of internet explorer, but also of the textareas.

Re: Modify the color of the scrollbar in Visual C++

#realJSOP21-Feb-06 7:55

#realJSOP

21-Feb-06 7:55

Ummm, the user sets his colors, and probably doesn't want applications mucking around with them. Bad idea.

------- sig starts

"I've heard some drivers saying, 'We're going too fast here...'. If you're not here to race, go the hell home - don't come here and grumble about going too fast. Why don't you tie a kerosene rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt

"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

((COleDispatchImpl*)&m_xDispatch)->Disconnect()

RobJones21-Feb-06 4:47

RobJones

21-Feb-06 4:47

Hello,
I am using a 3rd party SDK to display inventory of a machine; anyway after using the following code I close my application in debug mode and it throws an ASSERT error (listed below). This looks to me like the object either isn't being destroyed properly or the refrence count is incorrect for what ever reason...

Any ideas?

<code>
IDatabasePtr  ptr	= NULL;
IInventoryPtr inventory = NULL;
int result = 0;

CWaitCursor wait;
try
{
	ptr.CreateInstance(__uuidof(Database), NULL, CLSCTX_INPROC_SERVER);
	result = ptr->SetConnectionString(_bstr_t(strConnectionString));
		
	if (result == 0)
		AfxMessageBox("Database connect failed.");
	else
	{
		try
		{
			inventory.CreateInstance(__uuidof(Inventory), NULL, CLSCTX_INPROC_SERVER);
			inventory->ShowInventoryTree(lComputerIDN);
		}
		catch (_com_error&)
		{
			AfxMessageBox("COM Error: Failed");
		}
	}
}
catch(_com_error&)
{
	AfxMessageBox("COM Error: Failed");
}</code>

Here's the error in debug.

<code>CCmdTarget::~CCmdTarget()
{
#ifndef _AFX_NO_OLE_SUPPORT
	if (m_xDispatch.m_vtbl != 0)
		((COleDispatchImpl*)&m_xDispatch)->Disconnect();
	ASSERT(m_dwRef <= 1); ////////// <---------- HERE
#endif
#ifdef _AFXDLL
	m_pModuleState = NULL;
#endif
}</code>

Whoever said nothing's impossible never tried slamming a revolving door!

-- modified at 11:06 Tuesday 21st February, 2006

Possible to connect to multiple IE COM models through the ROT?

TClarke21-Feb-06 4:00

TClarke

21-Feb-06 4:00

Hi all,

While working with print templates I got into a situation where my JavaScript loaded ActiveX control was not filling my m_spClientSite with a value other than NULL.
After wrestling with it for a while I decided to take a back door. It was necessary for me to access the COM interfaces in my instance of IE so I went to the Running Object Table. I enumerated its contents and was relaxed when I saw 3 IE entries as that was the number of IE windows I had open. Each one had been opened from the other. My problem is that all the IE objects in the ROT have the values of the first IE window opened (unfortunately not the one I wanted). WTF | :WTF:

So my question is: is there a way of access the other IE COM interfaces?

Or even more helpful: what's the procedure when you control hasn't got a useful value in its m_spClientSite.

Thanks loads for any help

Tom

Re: Possible to connect to multiple IE COM models through the ROT?

Stephen Hewitt21-Feb-06 11:38

Stephen Hewitt

21-Feb-06 11:38

As I understand it you want to access IE interfaces from an ActiveX control hosted by it but IOleObject::SetClientSite hasn't been called on your control yet. This is a situation that should never happen, something is going wrong - perhaps your code is trying to access IE's interfaces before the control is hosted properly. My advise would be to try to find the source of the problem and not "hack around" it - You'll just make more trouble for yourself.

Steve

Re: Possible to connect to multiple IE COM models through the ROT?

TClarke21-Feb-06 22:45

TClarke

21-Feb-06 22:45

Thanks Steve.

That which should never happen seem to be a common occurance using print templates though.

Tom

how get a function instruction length?

HOW WHAT21-Feb-06 2:58

HOW WHAT

21-Feb-06 2:58

i not want use
void a()
{
}
void b()
{
}

a_funlen = b - a

Re: how get a function instruction length?

David Crow21-Feb-06 5:38

David Crow

21-Feb-06 5:38

What is your question?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

Re: how get a function instruction length?

HOW WHAT21-Feb-06 14:46

HOW WHAT

21-Feb-06 14:46

a function compile and link, in exe's length

int fun()
{
__asm mov eax, 1
__asm ret 0
}

mov eax, 1 == b8 01 00 00 00
ret 0 == c3

so the fun length is 6

Re: how get a function instruction length?

Joe Woodbury21-Feb-06 5:52

Joe Woodbury

21-Feb-06 5:52

The best way is to have the compiler produce assembly code. Go to project properties | C/C++ | Output Files | Assemler Output. Select "Assembly, Machine-Source and Code." The output will be ".cod" files in your object directory.

Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke

MessageBox() change line

blang047721-Feb-06 2:48

blang0477

21-Feb-06 2:48

How can I tell MessageBox() to switch to next row?
I tried "\n" and it seems not working.

Re: MessageBox() change line

Russell^'21-Feb-06 3:09

Russell^'

21-Feb-06 3:09

Sometime you have to use \r\n
(or \n\r... I don't remember)

Bye

Have a nice code day Wink | ;)

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