C / C++ / MFC Discussion Boards

Michael Schubert12-Jun-09 2:42

12-Jun-09 2:42

Did you even bother to read my reply when you posted this yesterday?

The text will wrap automatically when you use the ES_MULTILINE style.

DDX and Arrays

stevepqr11-Jun-09 22:32

stevepqr

11-Jun-09 22:32

VS6.0, C++

I have a control I need to 'interact' with, I set it up the usual way with
ID = IDC_TINY1 and using ClassWizard to assign a variable CStatic m_Tiny1, as expected this gives me:-

DDX_Control(pDX, IDC_TINY1, m_Tiny1);

and in the header:-

CStatic m_Tiny1;

Now though I have 11 more identical controls and instead of having m_Tiny1, m_Tiny2, m_Tiny3 etc I think it would be better to have an array m_Tiny[12] but there seems to be no way to assign each element of the array using ClassWizard. So I decided to edit these entries manually to give me:-

DDX_Control(pDX, IDC_TINY1, m_Tiny[0]);
DDX_Control(pDX, IDC_TINY2, m_Tiny[1]);
DDX_Control(pDX, IDC_TINY3, m_Tiny[2]);
.
.
.
DDX_Control(pDX, IDC_TINY12, m_Tiny[11]);

and:-

CStatic m_Tiny[12];

This appeared to work just fine until I came to edit another control using ClassWizard I then got the error:-

Parsing Error: Expected ")" Input Line:"DDX_Control(pDX,IDC_TINY1,m_Tiny[0]"

I'm assuming this is VS telling me I have an entry in the DDX that it didn't put there even though it quite happily will compile and run it.

So to the problem: Is having array elements in DDX entries a valid thing to do? If yes then how do I do it without the error?

Thanks

Apathy Rules - I suppose...

Its not the things you fear that come to get you but all the things that you don't expect

Re: DDX and Arrays

Cedric Moonen11-Jun-09 22:54

Cedric Moonen

11-Jun-09 22:54

stevepqr wrote:
Parsing Error: Expected ")" Input Line:"DDX_Control(pDX,IDC_TINY1,m_Tiny[0]"

You forgot ");" at the end of the line. That's exactly what VS is telling you also Smile | :)

Cédric Moonen
Software developer

Charting control [v2.0]
OpenGL game tutorial in C++

Re: DDX and Arrays

Chandrasekharan P11-Jun-09 23:03

Chandrasekharan P

11-Jun-09 23:03

cedric, i dont think he has forgotten to add the closing bracket because in the query where he is adding the control variable i can see the bracket being put properly.

Re: DDX and Arrays

Caslen11-Jun-09 23:05

Caslen

11-Jun-09 23:05

Thanks for that but I forgot it from the post not the code! message actually reads:-

Parsing Error: Expected ")" Input Line:"DDX_Control(pDX,IDC_TINY1,m_Tiny[0]);"

Sorry!

Re: DDX and Arrays

Chandrasekharan P11-Jun-09 23:00

Chandrasekharan P

11-Jun-09 23:00

put the above code after like this //}}AFX_DATA_MAP

//}}AFX_DATA_MAP


<blockquote class="FQ"><div class="FQA">stevepqr wrote:</div>DDX_Control(pDX, IDC_TINY1, m_Tiny[0]);
DDX_Control(pDX, IDC_TINY2, m_Tiny[1]);
DDX_Control(pDX, IDC_TINY3, m_Tiny[2]);
.
.
.
DDX_Control(pDX, IDC_TINY12, m_Tiny[11]);</blockquote>

in DoDataExchange Function. It should work.

Re: DDX and Arrays

Caslen11-Jun-09 23:06

Caslen

11-Jun-09 23:06

Thanks but the code is already included inside the '//}}AFX_DATA_MAP' I didn't change this part just added lines inside the markers.

Re: DDX and Arrays

Chandrasekharan P11-Jun-09 23:08

Chandrasekharan P

11-Jun-09 23:08

i had the same problem and this was solved by adding the code outside the markers.

Re: DDX and Arrays

Ozer Karaagac11-Jun-09 23:14

Ozer Karaagac

11-Jun-09 23:14

ClassWizard only parses the lines inside its comments.

You should place your custom lines outside the class wizard's special comments. Just below the comment line //}}AFX_DATA_MAP, for example.

CDialog::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CYourDialogClassName)
  // lines added by ClassWizard
  // DDX_Control(...);
  // DDX_Text(...);
//}}AFX_DATA_MAP
// lines added manually
DDX_Control(pDX, IDC_TINY1, m_Tiny[0]);
DDX_Control(pDX, IDC_TINY2, m_Tiny[1]);

You should also take definitions into account in header file.

// Dialog Data
//{{AFX_DATA(CDlgFoo)
enum { IDD = IDD_DIALOG1 };
CStatic m_static1;
//}}AFX_DATA
CStatic m_Tiny[12];

The lines added manually in that way, won't be parsed by ClassWizard.

Re: DDX and Arrays

Caslen11-Jun-09 23:28

Caslen

11-Jun-09 23:28

I thought of this already - when I try it I get 'Cannot Add New Member' when I try to add a new member but otherwise it works ok. I'm getting round this by commenting out the above lines adding new members and then uncommenting them, PITA!! Smile | :)

Re: DDX and Arrays

Ozer Karaagac11-Jun-09 23:39

Ozer Karaagac

11-Jun-09 23:39

The problem may be with <your project="" name="">.clw file. Close project then rename that file. ClassWizard will re-create it. Or you may edit yourself if you know what you do. Smile | :)

Re: DDX and Arrays

stevepqr12-Jun-09 0:02

stevepqr

12-Jun-09 0:02

Thanks! Deleting the .clw and regenerating it did the trick - strangely, after recreating it I had to exit VS and restart but now all is good.

Thanks to everyone else too for their suggestions.

Smile | :)

Apathy Rules - I suppose...

Its not the things you fear that come to get you but all the things that you don't expect

Saving and Restoring Toolbars (Win32 SDK)

signalatub11-Jun-09 22:03

signalatub

11-Jun-09 22:03

I am trying to Saving and Restoring Toolbars status by sending TB_SAVERESTORE message. MSDN says if you don't have user data to store with the toolbar buttons, you don't need to handle TBN_SAVE or TBN_RESTORE notification. So, now, the saving and restoring are fine, the program restores toolbar buttons correctly. However, if I try to kill that toolbar control restored, Visual Studio gives a warning message "Unhandled exception at 0x7c901230 in win32tst.exe: User breakpoint." This warning only shows if the program is launched inside the Visual Studio. It just runs fine if launched outside of Visual Studio. So I tried to debug with WinDbg.exe, and it gives a more detailed description of that user breakpoint warning "Invalid Address specified to RtlFreeHeap". Anybody knows what's wrong with the restoring? Thanks.

case WM_NOTIFY:
{
switch (((LPNMHDR)lParam)->code)
{
case TBN_GETBUTTONINFO:
{
LPTBNOTIFY lpTbNotify = (LPTBNOTIFY)lParam;

// Pass the next button from our array. There is no need to
// filter out buttons that are already used; they will be
// ignored.
int buttonCount = sizeof(tbButtons) / sizeof(TBBUTTON);
if (lpTbNotify->iItem < buttonCount)
{
lpTbNotify->tbButton = tbButtons[lpTbNotify->iItem];
return TRUE;
}
else
{
// No more buttons.
return FALSE;
}
}
break;

case TBN_QUERYINSERT:
case TBN_QUERYDELETE:
return TRUE;
case TBN_ENDADJUST:
{
TBSAVEPARAMS tbSave;
tbSave.hkr = HKEY_CURRENT_USER;
tbSave.pszSubKey = "Software\\key";
tbSave.pszValueName = "tbsave";
SendMessage(GetDlgItem(hWnd,ID_TOOLBAR),TB_SAVERESTORE, TRUE, (LPARAM)&tbSave);
}
return TRUE;
}
}
break;

Add support for Memory leak detection

Nandu_77b11-Jun-09 20:14

Nandu_77b

11-Jun-09 20:14

We have a huge C++ code, developed on Microsoft Visual Studio 6.0. This contains but server and client code. Now the requirement is to add a support for memory leak detection.
So can any one help me to code, which should check the existing whole code base for memory leaks.

Thanks,
Nandu

Re: Add support for Memory leak detection

chirag_chauhan11-Jun-09 20:46

chirag_chauhan

11-Jun-09 20:46

You can use CRT functions like _CrtDumpMemoryLeaks, Refer http://msdn.microsoft.com/en-us/library/d41t22sb(VS.71).aspx[^] to start with.

Re: Add support for Memory leak detection

Nandu_77b11-Jun-09 21:02

Nandu_77b

11-Jun-09 21:02

Thanks, But the above mentioned will not support VS6.0, I need a similar solution for VS 6.0

-Nandu

Re: Add support for Memory leak detection

Hamid_RT11-Jun-09 21:32

Hamid_RT

11-Jun-09 21:32

See Visual Leak Detector [^].

Of one Essence is the human race
thus has Creation put the base
One Limb impacted is sufficient
For all Others to feel the Mace
(Saadi )

segmentation problem

sandeep_dhruwa11-Jun-09 19:31

sandeep_dhruwa

11-Jun-09 19:31

Help me with these program
/* program to illustrte read function with pointer */
//this program may not work properly because of memory problems in read
#include<stdlib.h>
#include<stdio.h>
#include<unistd.h>
#include<string.h>
int main()
{
char *buf,c;
int nread;
memset(buf,0,0);
buf=malloc(1024);
nread=read(0,&buf,100);
printf("characters read: %d\n",nread);

if(nread == -1)
{
write(2,"An error occured in read function\n",27);
}
else
{
if(nread==0)
write(2,"Data is not written to the filedescriptor\n",27);
else
write(1,&buf,nread);
}
free(buf);
}

output:
sandeep@sandeep Unsure | :~

$ ./a.out <x
characters read: 75
this is Kead program
which is throwing lots of errore
lets correct them
Segmentation fault

Re: segmentation problem

Cedric Moonen11-Jun-09 20:13

Cedric Moonen

11-Jun-09 20:13

sandeep_dhruwa wrote:
char *buf,c;
int nread;
memset(buf,0,0);
buf=malloc(1024);

You have to call malloc before calling memset. Otherwise, you will try to write into an invalid pointer.

Cédric Moonen
Software developer

Charting control [v2.0]
OpenGL game tutorial in C++

Re: segmentation problem

sandeep_dhruwa11-Jun-09 21:06

sandeep_dhruwa

11-Jun-09 21:06

still I am getting the error

Re: segmentation problem

Cedric Moonen11-Jun-09 21:11

Cedric Moonen

11-Jun-09 21:11

And for the read and write functions, don't pass the address of your buffer variable: it is already a pointer. Pass the pointer directly:

read(...,buffer,...);

(apply that for every read and write).

Cédric Moonen
Software developer

Charting control [v2.0]
OpenGL game tutorial in C++

Re: segmentation problem

sandeep_dhruwa11-Jun-09 23:51

sandeep_dhruwa

11-Jun-09 23:51

thanks it solved
thankyou

Re: segmentation problem

CPallini11-Jun-09 21:25

CPallini

11-Jun-09 21:25

sandeep_dhruwa wrote:
nread=read(0,&buf,100);

sandeep_dhruwa wrote:
write(1,&buf,nread);

You should use buf, not &buf.
For instance

nread = read(0, buf, 100);

BTW your code is a mess, you really need a good C tutorial.
Smile | :)

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.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Call to a constructor while executing (obj < 3) . Kindly explain?

Member 397434711-Jun-09 18:01

Member 3974347

11-Jun-09 18:01

class CA{
  private:
    int m_Var;
  public:
        CA(int x=0): m_Var(x){cout<<"1";}
        bool operator < (const CA &obj2) {     cout<<"2";       return (m_Var < obj2.m_Var) ? true : false;}
};
int main(void) {
  CA obj1=2;
  if(obj1 < 3){cout << "In If block" << endl;}
}

the output of this code is 112In If block .. i can understand the reason behind the first 1 and "2In If block" .. i dont understand when the second 1 is being called?

as per my understanding when (obj1<3) executes it may call obj1.operator<(3)

But constructor is being called but whats makes it to call?
kindly explain why the second 1 is being displayed?

Re: Call to a constructor while executing (obj < 3) . Kindly explain?

Naveen11-Jun-09 18:18

Naveen

11-Jun-09 18:18

Member 3974347 wrote:
as per my understanding when (obj1<3) executes it may call obj1.operator<(3)

Not actually. It is actually called like

obj1.operator<( CA(3));// A local temporary object is created here.

Here the integer 3 is automatically converted to a CA object by involking the constructor. Such conversions are called implicit conversions. You can prevent such conversions using the explicit keyword[^]

nave

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