C / C++ / MFC Discussion Boards

thenewbee8-Jun-07 3:14

8-Jun-07 3:14

Iam new to MFC.
I have a Dialog Bar having a text box attached to toolbar. When i try to change the value of that text box i get an error - something like unsupported action.
When i debugged i came to know that its showing error on UpdateData(TRUE)

MY code is
class A{
.
.
.
MyDlgBar obj;
obj.Value="xxxxxx";// value is a public variable
obj.UpdateValue();
.
.
.
}

********
void MyDlgBar::UpdateValue(){
.
.
SetDlgItemText(IDC_EDIT1,Value);
UpdateData(TRUE);
.
.
}
Whats the reason for this . . .

Re: DialogBar

Rajkumar R8-Jun-07 3:30

Rajkumar R

8-Jun-07 3:30

Hi,
check whether you created the dialogbar using Create() function.
MyDlgBar obj; I think the constuctor donot create the window.

Best Regards
Raj

Re: DialogBar

vivekphlp10-Jun-07 17:33

vivekphlp

10-Jun-07 17:33

The dialog bar is being displayed but the above said functionality is not working... (passing a value to the dialog bar)

Proud To Be an Indian

Re: DialogBar

Rajkumar R10-Jun-07 18:56

Rajkumar R

10-Jun-07 18:56

Hi,
What the MyDlgBar::DoDataExchange() does?

Re: DialogBar

thenewbee10-Jun-07 19:56

thenewbee

10-Jun-07 19:56

i dint change it . . .
it have the default code some

DDX_Text(pDX, IDC_EDIT1, m_strIndicator);

where
//{{AFX_DATA_INIT(CIndicator)
m_strIndicator = _T("hi");
//}}AFX_DATA_INIT

CEdit box buffer limit

NYTSX8-Jun-07 3:03

NYTSX

8-Jun-07 3:03

Hi,

I'm working on an application that is trying to emulate a DOS prompt utilizing a CEdit box. I have the data scrolling as the data fills the window, but every so often the data stops updating. I can still scroll the window up and down, but the data just doesn't show up anymore.

My question is whether there is a buffer size the window can handle? Is there a way to actually have it function like command prompt and automatically erase/delete the oldest info from the screen? (right now it shows everything from the start of the application and never erases anything)

Thanks in advance

Re: CEdit box buffer limit

David Crow8-Jun-07 3:08

David Crow

8-Jun-07 3:08

NYTSX wrote:
My question is whether there is a buffer size the window can handle?

I seem to recall it being 64KB.

NYTSX wrote:
Is there a way to actually have it function like command prompt and automatically erase/delete the oldest info from the screen?

Yes. You could keep everything in a CString variable, which you trim accordingly.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: CEdit box buffer limit

NYTSX8-Jun-07 3:36

NYTSX

8-Jun-07 3:36

DavidCrow wrote:
Yes. You could keep everything in a CString variable, which you trim accordingly.

Can you elaborate a little more on this?

Or maybe I can explain in more detail of what I want to accomplish, and you can tell me how to resolve it with your CString idea?

Basically I need to delete old "commands" entered into my window exactly how it is done in a command prompt. This way as the window scrolls down with new data the oldest one is deleted. I would like to keep the last 200 or so lines of text in my CEdit box.

Thanks!

Re: CEdit box buffer limit

David Crow8-Jun-07 3:43

David Crow

8-Jun-07 3:43

NYTSX wrote:
I would like to keep the last 200 or so lines of text in my CEdit box.

If the lines are not too long, perhaps a listbox would be a better choice. Add lines 1-200 to the control, and when the 201st line is added, simply delete the first (oldest) line from the control. Make sense?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: CEdit box buffer limit

NYTSX8-Jun-07 3:55

NYTSX

8-Jun-07 3:55

Unfortunately this is a older application that I am updating since now there is more traffic going to the screen and it uses a CEdit box.

I originally thought about using a listbox, but the commands actually span across multiple lines and of course I don't have time or the budget to completely over haul the app.

Have any more suggestions? Is there a way I can access the 64kb buffer that is allocated for the control?

Thanks!

Re: CEdit box buffer limit

David Crow8-Jun-07 3:59

David Crow

8-Jun-07 3:59

NYTSX wrote:
Have any more suggestions?

Yes. How about using a CStringArray?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: CEdit box buffer limit

daveyerwin8-Jun-07 6:14

daveyerwin

8-Jun-07 6:14

>I would like to keep the last 200 or so lines

here is an idea ...

CString cs;
for(i=0;i<200;i++){cs += "\r\n";}//"initialize" string

cs = AddLastRemoveFirst("these two lines are added to the end\r\nand two lines are removed from the beginning",cs);// add to string

CString AddLastRemoveFirst(CString StringToAdd, CString StringToAddTo)
{
  CString newline("\r\n");
  StringToAdd += newline;
  int i ;
  i = StrToAdd.Find(newline);
  while(i != -1)
  {		
    StringToAddTo = StringToAddTo.Mid(StringToAddTo.Find(newline) + 2) ;	
    StringToAddTo += StringToAdd.Left(i) + newline;			
    StringToAdd = StringToAdd.Mid(StringToAdd.Find(test) + 2);
    i = StrToAdd.Find(newline);
  }
  return StringToAddTo ;
}

How to retrieve text

arun kumar kk8-Jun-07 1:31

arun kumar kk

8-Jun-07 1:31

hi
I am developing an MDI application.
I am using DrawText() method to display text on the view.
I want to retrieve the text while clicking on the text.

plz help me if you have the technic to dod that

regards

Arun Smile | :)

Re: How to retrieve text [modified]

Rajkumar R8-Jun-07 2:23

Rajkumar R

8-Jun-07 2:23

Hi,
Why You are not happy with this link, you have posted the message once again?

http://blogs.msdn.com/oldnewthing/archive/2004/04/23/118893.aspx[^]

I am not familiar with Accessibility API.

I suggest one method, Keep the text information and position expliclitly of all the Text String drawn using drawtext() and on mouse click() select the text from the data using a simple rectangle collision(hit test) from the mouse pos.

Best Regards
Raj.

-- modified at 8:33 Friday 8th June, 2007

Re: How to retrieve text

Nelek8-Jun-07 3:30

Nelek

8-Jun-07 3:30

Or make an CObject derived class with "position" and "content" as members.

Then when you click, take check out if the click is where you want. If one object has this point in its "position" range, make whatever you want with the "content"

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Re: How to retrieve text

Hamid_RT8-Jun-07 3:53

Hamid_RT

8-Jun-07 3:53

You asked this question again did you see my reply?

WhiteSky

Re: How to retrieve text

Rajkumar R8-Jun-07 4:01

Rajkumar R

8-Jun-07 4:01

Hi,
That's what I asked him.
BTW, Iam not familiar with accessibility API.
Could you please brief how its working on drawtext.
if not it's ok I will refer it.

Best Regards
Raj

error C2664 in MFC..?

Software_Specialist8-Jun-07 1:31

Software_Specialist

8-Jun-07 1:31

<br />
ifstream message_file;<br />
TCHAR message[1000];<br />
int i;<br />
message_file.get(message[i++]);<br />

ERROR C2664 : cannot convert parameter 1 from 'TCHAR' to 'char&'

Any suggestions for the above problem

Re: error C2664 in MFC..?

Rajkumar R8-Jun-07 2:13

Rajkumar R

8-Jun-07 2:13

Hi,

use wifstream in place of ifstream,
it seems your project is unicode defined.

you may use

 #ifdef _UNICODE
wifstream message_file;
#else
ifstream message_file;
#endif

Best Regards
Raj

Re: error C2664 in MFC..?

CPallini8-Jun-07 2:17

CPallini

8-Jun-07 2:17

Why are you mixing Generic-Text Mappings with a class specialized for elements of type char?

Software_Specialist wrote:

TCHAR message[1000];

Try to change the above with:

char message[1000];

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Re: error C2664 in MFC..?

Software_Specialist8-Jun-07 2:27

Software_Specialist

8-Jun-07 2:27

well i am well confused now. okay pls have a look over this post of mine where i discussed mainly about char variable...

http://www.codeproject.com/script/comments/forums.asp?forumid=1647&select=2073148&df=100&fr=26

Now all of them said me to use TCHAR in place of char or wchar_t..
I have not defined UNICODE...All of them said that TCHAR can handle both UNICODE nad non UNICODE ...So its always better to use TCHAR.

Now i am finished changing every related char to TCHAR and left with 1 error which i asked ...

Well yeh i am rewriting mfc VC++ code to VS2005(MFC)...so am facing promlems...m new to MFC...

Now if ill change message back to char ill again get many errors so that means i have to change everything again....and would end up in never ending error loop....
Any other way out...?

Thanks

Re: error C2664 in MFC..?

Rajkumar R8-Jun-07 2:39

Rajkumar R

8-Jun-07 2:39

Hi,
Yes, It's nice choice of using generic text mapping function.
So that you can compile both in unicode and non unicode version.

Well C++ stream class has both version,
whar_t version of "ifstream" is "wifstream", "cin" is "wcin", ...
but i don't know the generic mapping for these class.

map these classes yourself for unicode and other version.

Best Regards
Raj

Re: error C2664 in MFC..?

CPallini8-Jun-07 2:42

CPallini

8-Jun-07 2:42

Software_Specialist wrote:
Now all of them said me to use TCHAR in place of char or wchar_t..
I have not defined UNICODE...All of them said that TCHAR can handle both UNICODE nad non UNICODE ...So its always better to use TCHAR.

Well, they're right: actually TCHAR works both for UNICODE and not-UNICODE builds. The same is not true for ifstream that is a class specialized for handling char buffers.
YOu can either follow my suggestion or accept the more elegant solution of Rajkumar_R [^].
Big Grin | :-D

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Re: error C2664 in MFC..?

David Crow8-Jun-07 2:46

David Crow

8-Jun-07 2:46

Software_Specialist wrote:
I have not defined UNICODE...

This is the default for VS2005. Change ifstream to wifstream as has been mentioned.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: error C2664 in MFC..?

Software_Specialist8-Jun-07 3:03

Software_Specialist

8-Jun-07 3:03

wifstream giving me linking errors....may be i need to change all the ifstream to wifstream....n ofstream to wofstream...
trying to figure this out....

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