C / C++ / MFC Discussion Boards

Vaclav30-Aug-04 7:07

30-Aug-04 7:07

Thanks, you are correct.
I guess the real question is why did it showed up when I added multiple inheritance to the class. Time to check the macro itself.
Vaclav

Re: Multiple inheritance in MFC

PJ Arends30-Aug-04 17:58

PJ Arends

30-Aug-04 17:58

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_mfc_cobject.3a3a.operator_new.asp[^]

I have now read TN016. It states you have to overload the operator new and operator delete to remove amibiguities. Seems to me you also have to overload the third (three parameter) version of new.

Good luck;)

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

Re: Multiple inheritance in MFC

Vaclav31-Aug-04 9:57

Vaclav

31-Aug-04 9:57

Yes, it does say that, but only if the additional class has same base class.
I am just adding my own abstract class to add new precedures to the view class. I am actually trying to find an easy way to determine an active view so I can modify it. So far I found several ways to do that, but all of them require the actuall view class (cast) to work properly. The "normal" MFC code always returns CView class pointer which is pretty useless in my case.

It seem this note writer missed some important "details".

Thanks for you help.
Vaclav

Struct for CListCtrl items/subitems

Thomas Latuske29-Aug-04 8:03

Thomas Latuske

29-Aug-04 8:03

Hi,

I have a CListCtrl derived class. My question is how do I append a structure, with properties like textcolor, font..., to the items/subitems of this control? Should I use a CMap? If I should then tell me please how I should initialize the structure and the CMap a how do I map the struct to the items?

TIA!!!

best regards
Thomas

Re: Struct for CListCtrl items/subitems

toxcct29-Aug-04 9:24

toxcct

29-Aug-04 9:24

search for some articles here in CP... there are many good ones ; i'm sure you can fine what you need.

cheers,

TOXCCT >>> GEII power

Re: Struct for CListCtrl items/subitems

KaЯl29-Aug-04 22:53

KaЯl

29-Aug-04 22:53

If you want to customize the look of your ListCtrl items, you should have a look to this article: Neat Stuff to do in List Controls Using Custom Draw[^]

And if this article doesn't fit your need, have a look to the
List Control articles[^], you should find what you want there.

HTH,

K.

Собой остаться дольше...

Re: Struct for CListCtrl items/subitems

David Crow30-Aug-04 4:44

David Crow

30-Aug-04 4:44

After calling InsertItem(), you'll then need to call SetItemData().

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Ellipsis / variable parameters

0v3rloader29-Aug-04 6:46

0v3rloader

29-Aug-04 6:46

Hello,

I am implementing a function which accepts a number of variable parameters and it has the following form:
char *FormatString(char *pszFrm, ...)

This function performs some (limited) processing which, when concluded, should branch execution to a different function. And this is where the problem lies.

How do I pass this variable number of parameters, as it is (meaning unchanged), to a different function?

Any insights will be greatly appreciated.

Thank you

Re: Ellipsis / variable parameters

PJ Arends29-Aug-04 8:46

PJ Arends

29-Aug-04 8:46

You can pass the va_list you generate to any function that takes it.

char *FormatString(char *pszFrm, ...)
{
  va_list arguments;
  va_start(arguments, pszFrm);
 
  // Call function, passing 'arguments' as one of the variables
 
  va_end(arguments);
 
  return pointer_you_got_somehow;
}

Going by your function name, you are probably wanting to pass the parameters onto sprintf(). You can pass the va_list onto _vsnprintf which does the same thing as sprintf.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclang98/html/_pluslang_functions_with_variable_argument_lists.asp[^]

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

"Obviously ??? You're definitely a superstar!!!" mYkel - 21 Jun '04

Within you lies the power for good - Use it!

Re: Ellipsis / variable parameters

0v3rloader29-Aug-04 9:48

0v3rloader

29-Aug-04 9:48

I've been poking aroung MFC source files and managed to find a reference in ::AfxTrace to the _vsnprintf function...

But thanks a lot anyway!

Cheers,

David Nimrod

Sequentially sorting

Daniel132429-Aug-04 5:46

Daniel1324

29-Aug-04 5:46

I have a CStringArray filled with a bunch of filenames. The filenames are like this... 1.jpg, 2.jpg, 3.jpg, and so on.

I have over a thousand of these. From time to time and for some reason I need to go through and rename all of them. I use CFileFind with FindFile() and FindNextFile()to fill the string array with the filenames. But, they're sorted alphabetically, 1.jpg, 10.jpg, 100.jpg, 2.jpg, 20.jpg, etc.

I need these to be sorted sequentially.

I cant seem to figure out how to do it. All I need is to sort the filenames in the string array sequentially.

Any help?

Thanks,
Daniel

Re: Sequentially sorting

Maximilien29-Aug-04 6:09

Maximilien

29-Aug-04 6:09

string sorting is different than numerical sorting.

if your filenames are only <number>.jpg then, convert the number from string to number and sort according to the numbers.

<hr><a href="http://www.thesorus.qc.ca">Maximilien Lincourt</a>
<b>Your Head A Splode</b> - <i>Strong Bad</i>

Re: Sequentially sorting

Daniel132429-Aug-04 6:26

Daniel1324

29-Aug-04 6:26

I tried that first. Sorting an array of ints isnt any easier.

Know of an easy way to sequentially sort an array of ints?

Re: Sequentially sorting

Maximilien29-Aug-04 6:38

Maximilien

29-Aug-04 6:38

have a look at

QuickSort enabled CArray template class

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: Sequentially sorting

Daniel132429-Aug-04 6:43

Daniel1324

29-Aug-04 6:43

I figured this out...

	<br />
for (int yy = 0; yy < Size; yy++)<br />
{<br />
   for (int y = 1; y < Size; y++)<br />
   {<br />
      if (c[y] < c[y-1])<br />
      {<br />
         a = c[y-1];<br />
         b = c[y];<br />
         c[y] = a;<br />
         c[y-1] = b;<br />
         a = b = 0;<br />
      }<br />
   }<br />
}<br />

Size = size of int array.

Its ugly, but it works.

Re: Sequentially sorting

Ryan Binns29-Aug-04 19:24

Ryan Binns

29-Aug-04 19:24

Daniel1324 wrote:
for (int yy = 0; yy < Size; yy++)
{
for (int y = 1; y < Size; y++)
{
if (c[y] < c[y-1])
{
a = c[y-1];
b = c[y];
c[y] = a;
c[y-1] = b;
a = b = 0;
}
}
}

Size = size of int array.

Eek! | :eek:

Yikes! Have a look at the qsort() C library function. You should be able to do this:

static int intCompareFunc(const void *parm1, const void *parm2)
{
  int num1 = *static_cast<const int*>(parm1);
  int num2 = *static_cast<const int*>(parm2);
  return num1 - num2;
}
...
qsort(c, sizeof(int), Size, intCompareFunc);

That should sort the c array in ascending order.

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Use STL

Kevin McFarlane8-Oct-04 11:11

Kevin McFarlane

8-Oct-04 11:11

The best way to do these kinds of operation these days is to use STL. See my article here:

http://www.codeproject.com/vcpp/stl/legacytostl.asp[^]

You can apply STL algorithms to ordinary arrays and the MFC CArray as well as to vector.

Kevin

Finding CRLF or other Characters in char

shibble29-Aug-04 4:32

shibble

29-Aug-04 4:32

Hi,
iam a beginner to visual c++ and i think i have a simple question:
i want to search a character in a char variable.
like

<br />
switch (&mychar)<br />
  {<br />
  case CHR(13):<br />
    MessageBox("found");<br />
  default:<br />
    MessageBox("Not Found!");<br />
  }<br />

In VB i could compare like
if mychar = Chr(13) then ...

Can anybody call me the functionname of Chr or Ord or ASC in MFC c++ 6.0?
Thx alot!!
Bye

Re: Finding CRLF or other Characters in char

Member 30761229-Aug-04 7:09

Member 307612

29-Aug-04 7:09

Just use

case 13:<br />
// code

char is numerical type in C++

Igor Green
http://www.grigsoft.com
Compare It! + Synchronize It! : Files and folders comparison never was easier!

Re: Finding CRLF or other Characters in char

shibble29-Aug-04 7:19

shibble

29-Aug-04 7:19

Thx alot!!

Indentation+word wrapping in Edit windows

DaFrawg29-Aug-04 2:26

DaFrawg

29-Aug-04 2:26

Does someone know how I can indent the second part of a line in an edit control if it is wrapped?

Re: Indentation+word wrapping in Edit windows

Ryan Binns29-Aug-04 19:34

Ryan Binns

29-Aug-04 19:34

Try using a rich edit control rather than a standard edit box. You can set paragraph properties for them, including hanging indentation.

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Detect available ODBC data sources?

Roland E.29-Aug-04 0:09

Roland E.

29-Aug-04 0:09

Hi everyone!

Just wanted to know if there is a possibility to detect what ODBC data sources are available on the current system.

Right now I just open a DSN by calling OpenEx(..) from CDatabase. If I get returned false only would be fine, but I always get a messagebox telling me that the database source is not available.

I am using Firebird ODBC drivers. If I would be able to open the datasources by opening the database files (*.fdb) directly and not through the DSN, you could help me either! But so far I found no connection string that would do so for Firebird...

Thanks in advance,
Roland

Re: Detect available ODBC data sources?

JimmyRopes29-Aug-04 5:04

JimmyRopes

29-Aug-04 5:04

It depends on how comfortable you are with the system registry and if you are running WinNT/2000/2003/XP? I don't know if the Win98/ME directory is structured exactly the same way but a little exploring will probably get you similar information.

If you are not familiar with the system registry take a look at it using the H:\WINDOWS\system32\regedt32.exe (H:\WINNT\system32\regedt32.exe for NT) program. The H: drive is the system drive on my system so you will have to substitute your system drive, probably C:, if you have a single operating system loaded on your machine. You can also enter the "set" comand from the command line in a DOS command window and there will be an environment variable named SystemDrive that will tell you, as the name implies, what your system drive is. You can alternatively go to Control Panel=>System and look under the Advanced tab for a button labeled "Environment Variables" and use the windir system variable to construct the path to the regedit32 program.

Anyway, when you execute the regedit32 program you will be able to see what resides in your system registry. As the program name implies you can also edit the contents of your system registry but I would highly recommend against this unless you are very familiar with what the consequnces of the edit are.

Under the key "HKEY_LOCAL_MACHINE\SOFTWARE\ODBC\ODBC.INI\ODBC Data Sources" you will find an entry for each ODBC data source defined on your system and it's associated data provider. You can enumerate the data sources and parse the strings for *.fdb, in your case, and you have enough information to access the data base via ODBC services.

If you want more information about the data base use the data source string name to go further down the ODBC.INI tree and look for the string named "DBQ" under the data source name. The "DBQ" string value will be the path to the data base. From there you can test for the existance of the data base and from the "FIL" string value you can determine what type of data base you will be working with.

There are examples of accessing the system registry and using ODBC services programmitacly in MSDN if you are using the Microsoft Visual C++ compiler. If you are using another compiler consult their API documentation for how to accomplish the same results.

"Small" bug in CSimpleArray ???

Ernesto D.28-Aug-04 22:47

Ernesto D.

28-Aug-04 22:47

Hi all, ibe been trying to find a memory leak for the last 5 hours, and then i discovered what i think is a "small bug" in CSimpleArray<> collection helper, here´s an example:

class acls
{
public:
CString m_str;
// constructor, copy constructor, etc. here
};

// in some function...

// create some objects to add...
acls mycls;
mycls.m_str="ABC";
acls another;
another.m_str="CDE";

// and create the array & add the objects
CSimpleArray<acls> arr;
arr.Add(mycls);
arr.Add(another);
arr.RemoveAt(1);

this results in a memory leak pointing to the 2nd object added to the array, the interesting part is, that if you remove the very first item instead (RemoveAt(0)) there is no leak.
Can NE1 suggest a way arround this that does not involve NOT using CSimpleArray? my project is allmost finished, and rewritting everything not to use these arrays would take me forever.
thanks!

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