C / C++ / MFC

Tomasz Sowinski30-Aug-02 1:12

30-Aug-02 1:12

Have a look at call stack. Where (file/line) is ASSERT located?

Tomasz Sowinski -- http://www.shooltz.com

Free your mind and your ass will follow.

jhwurmbach30-Aug-02 3:20

jhwurmbach

30-Aug-02 3:20

Do you have looked at CPtrArray? Maybe that helps.

BTW CArray is deprecated, nonstandard and broken. You are better off using a
std::vector<CEndPointGroup*>
or even a
std::vector<boost::shared_ptr<CEndPointGroup>>

Just remember to never use std::auto_ptr in a std:: container.

Tomasz Sowinski30-Aug-02 3:21

30-Aug-02 3:21

jhwurmbach wrote:
BTW CArray is deprecated, nonstandard and broken

Nonstandard, yes. But I'd appreciate if you'd explain 'broken' and 'deprecated' part.

Tomasz Sowinski -- http://www.shooltz.com

Free your mind and your ass will follow.

jhwurmbach30-Aug-02 3:48

jhwurmbach

30-Aug-02 3:48

Broken:
http://www.codeproject.com/cpp/ocarray.asp[^]
or
http://www.codeproject.com/cpp/carray_pitfall.asp[^]
The use of 'pitfall' is the same as MS using 'issue': Politically correct term for 'ERROR'
Meaning: CArray and references don't work.

Deprecated:
CArray is what MS had to come up with when the STL was not working, but they needed the functionality for MFC. Since the time the standard was released, there is no need to use these old nostandard CArray.

Problems with CArray

Koep30-Aug-02 0:48

Koep

30-Aug-02 0:48

Hi,

i believe that i have a problem to create a instance of the following object.

Declaration :
CArray <cendpointgroup*,cendpointgroup*> m_arEndPointGroups;

Add Pointer :
CEndPointGroup* _pEndPointGroup = NULL;
_pEndPointGroup = new CEndPointGroup(_groupname);
m_arEndPointGroups.Add(_pEndPointGroup);

At the last line i get an error. It seems that the arEndPointGroups-object is wrong allocated. What do i wrong ?

Marco

Re: Problems with CArray

mishgun30-Aug-02 1:35

mishgun

30-Aug-02 1:35

Maybe error in declaration of m_arEndPointsGroup?
CArray is class template
try CArray<cendpointgroup*, cendpointgroup*=""> m_arEndPointsGroup

nobody is perfect

Re: Problems with CArray

Koep30-Aug-02 1:43

Koep

30-Aug-02 1:43

Have u ever worked with CArray ?

Marco

CPrintDialog problem

Wouter Dhondt29-Aug-02 23:58

Wouter Dhondt

29-Aug-02 23:58

I'm losing all my hair on this one.

In my app, I create a CPrintDialog like this:

CPrintDialog dlg(FALSE);<br />
dlg.DoModal();

which is very basic stuff. Running this, the dialog appears. When I select the printer properties, the app closes itself without a message! So I created a new app with the MFC wizard. In this app, I've put the same code. And guess what: no problems at all. The printer properties are shown without a problem.

To make things worse, I only have this problem in NT SP6. No problem in W2K. Haven't tested this on other windows versions...

In debugging, I get an assertion.
Pressing retry on the assertion:
call stack:

AfxWndProc(HWND__ * 0x0012e870, unsigned int 1240072, unsigned int 1239180, long 1239124) line 365 + 25 bytes<br />
AfxWndProcBase(HWND__ * 0x0012e870, unsigned int 1240072, unsigned int 1239180, long 1239124) line 220 + 21 bytes

function:

/////////////////////////////////////////////////////////////////////////////<br />
// The WndProc for all CWnd's and derived classes<br />
<br />
LRESULT CALLBACK<br />
AfxWndProc(HWND hWnd, UINT nMsg, WPARAM wParam, LPARAM lParam)<br />
{<br />
	// special message which identifies the window as using AfxWndProc<br />
	if (nMsg == WM_QUERYAFXWNDPROC)<br />
		return 1;<br />
<br />
	// all other messages route through message map<br />
	CWnd* pWnd = CWnd::FromHandlePermanent(hWnd);<br />
	ASSERT(pWnd != NULL); // ASSERT FAIL HERE	ASSERT(pWnd->m_hWnd == hWnd);<br />
	return AfxCallWndProc(pWnd, hWnd, nMsg, wParam, lParam);<br />
}

Any ideas? I'm thinking of some conflicting resources...

New and improved: kwakkelflap.com

Recompiler Engine

Joel Holdsworth29-Aug-02 23:55

Joel Holdsworth

29-Aug-02 23:55

Hi Everyone,
I'm currently embarking on the most exciting, but complex project I've ever attempted. The program is an advanced parametric image generator. In the last version of the program I had a wonderful engine in place, but in the end it got rather tripped by its own complexity, and the overhead involved. So now in this second generation of the program I want to implement a dynamic recompilation engine.

Atm my plugins spit out a whole load of C++ code into a buffer which is then saved, and I'm using the MSVC compiler to compile the code into a dll, which I can then call to perform my image making work. The problem is that any possible speed increases are kind of lost in the time taken to build the dll, and in the wasted cycles from C++'s inherant slowness problems. Also the microsoft license specifically states that bundling their compiler with your product is illegal - I'm not so worried about this because its only a homebrew thing. (Btw I'm only using C++ because I need to comunicate with my C++ objects, I would prefer C in this case of coarse). But the whole system is a little messy.

I would prefer a lighter language such, but it must capable of interfacing with a MSC++ DLL, be reasonably easy to learn, compiling quickly, produce reasonably quick code, and preferably be open source (so I can mod it so that it spits out function ptrs rather than files). I know this is a tall order, and I'm asking if any of you know at all. Am I going about it the right way? would you suggest that I make my own scripting language which cuts and pastes blocks of asembler together? Maybe if anyone has experience in this type of thing...

Any help is much appreciated...

With time we live, with money we spend!
Joel Holdsworth.

Re: Recompiler Engine

Tomasz Sowinski30-Aug-02 0:03

30-Aug-02 0:03

Joel Holdsworth wrote:
in the wasted cycles from C++'s inherant slowness problems

Jig | [Dance]

LOL

Are you programming in assembler or just entering binary codes? Smile | :)

You can consider GCC - I think that C++ objects could be made compatible, as long as you don't use multiple inheritance.

Tomasz Sowinski -- http://www.shooltz.com

Free your mind and your ass will follow.

Re: Recompiler Engine

Joel Holdsworth30-Aug-02 0:26

Joel Holdsworth

30-Aug-02 0:26

Isn't GCC only for UNIX? Or is there some way of getting it run well with windows? Does it work with XP?

With time we live, with money we spend!
Joel Holdsworth.

Re: Recompiler Engine

Tomasz Sowinski30-Aug-02 0:37

30-Aug-02 0:37

Quick search on sourceForge(t) reveals this:

http://sourceforge.net/projects/mingw/[^]

Tomasz Sowinski -- http://www.shooltz.com

Free your mind and your ass will follow.

load file in buffer

Brakanjan29-Aug-02 22:44

Brakanjan

29-Aug-02 22:44

hi
I'm new to C++ and would like to know how to load a file into a buffer. Is it something like
char *buf1 = fopen(??);
though that does not seem to work

thanks

jmkhael29-Aug-02 23:31

jmkhael

29-Aug-02 23:31

FILE * pf;
pf = fopen("C:\\File\\Path\\File.extension" , "R" );

if (pf) { // File well opened
// in order to read work on the fread function

}

if u want to use MFC see the CStdioFile or CFile class

Papa
Murex Co.

while (TRUE)
Papa.WillLove ( Bebe ) ;

Brakanjan30-Aug-02 2:49

Brakanjan

30-Aug-02 2:49

tx for the reply.
pf (file in my case) unfortunately does change, but to 0, so the if function isn't entered. The file does exist, cuase I'm using the following code:

FILE *file;
CFileDialog cf(TRUE);

//Get Filename
if (cf.DoModal() == IDOK)
{
CString m_pathname1 = cf.GetPathName();
file=fopen(m_pathname1,"R");
}

if (file)
{
//does not enter here!!
}

what am I doing wrong?

Brakanjan30-Aug-02 2:56

Brakanjan

30-Aug-02 2:56

tx for the reply
pf (file in my case) unfortunately does change, but to 0, so the if function isn't entered. The file does exist, cuase I'm using the following code:

FILE *file;
CFileDialog cf(TRUE);

//Get Filename
if (cf.DoModal() == IDOK)
{
CString m_pathname1 = cf.GetPathName();
file=fopen(m_pathname1,"R");
}

if (file)
{
//does not enter here!!
}

what am I doing wrong?

Re: Tree control alignment

pépé30-Aug-02 4:18

pépé

30-Aug-02 4:18

file=fopen(m_pathname1,"r");

with a lowercase 'r'

"640K ought to be enough for anybody."
Bill Gates

Tree control alignment

Anonymous29-Aug-02 22:40

Anonymous

29-Aug-02 22:40

I like to right align tree control. If you know any idea then please tell me. Actually i want to print tree items in Arabic and for this purpose i needed to change the alignment of tree control items. If you know any such sample application or method then please tell me.

Tomasz Sowinski29-Aug-02 23:34

Access of PropertyPage members

29-Aug-02 23:34

I guess you should check WS_EX_LAYOUTRTL and SetProcessDefaultLayout. The following article has more information:

http://www.microsoft.com/msj/defaultframe.asp?page=/msj/0499/multilangUnicode/multilangUnicode.htm[^]

Tomasz Sowinski -- http://www.shooltz.com

Free your mind and your ass will follow.

Arjan Schouten29-Aug-02 22:39

Arjan Schouten

29-Aug-02 22:39

Hi,

I want to access member functions of my derived CPropertyPage
Classes from the PropertySheet in a for loop. The problem is that I don't how to get a pointer to the correct PropertyPage Class

I can do it like this

<br />
CParameterList parList;<br />
CMainPage* mainPage = GetPage(0);<br />
parList = mainPage->GetList();<br />
DoStuff();<br />
<br />
CDrivePage* drivePage = GetPage(1);<br />
parList = drivePage->GetList();<br />
DoStuff();<br />
<br />
and more<br />

But it would make more sence if I could do it in a loop

<br />
for (int i = 0 ; i < GetPageCount(); i++)<br />
{<br />
CParameterList parList;<br />
CPropertyPage* page = GetPage(i); // Now I can only access     members of the base class<br />
parList = page->GetList();                  // So this would not work <br />
DoStuff();<br />
}<br />

van Padoea

Re: Access of PropertyPage members

Pavel Klocek29-Aug-02 23:17

Pavel Klocek

29-Aug-02 23:17

1) You can use IsKindOf:

CPropertyPage* page = GetPage(i); <br />
if(page.IsKindOf(RUNTIME_CLASS(CMainPage))) ((CMainPage*)page)->GetList();

2) If you have GetList() methods in all your pages, you can derive your pages from a intermediate class which defines the GetList() method as virtual:

class CListPage:CPropertyPage<br />
{<br />
    virtual CParameterList GetList()=0;<br />
    ...<br />
}<br />
<br />
class CMainPage:CListPage<br />
{<br />
   virtual CParameterList GetList(){...}<br />
   ...<br />
}

Sonork 100.15206;PavelK

Re: Access of PropertyPage members

Arjan Schouten29-Aug-02 23:33

Arjan Schouten

29-Aug-02 23:33

Thank you,

Will try option 2 first.

van Padoea.

If every fool wore a crown, we would all be king - Lard

A question about a strange "extern" statement.

George Ma29-Aug-02 22:30

George Ma

29-Aug-02 22:30

Hi, everyone!

Take a look at the following source codes,

--------
#ifdef __cplusplus
extern "C" {
#endif
--------

In my experience, we can use function and variable after
the key word "extern", but what means "C" {
here?

Cheers,
George

Re: A question about a strange "extern" statement.

Dominik Reichl29-Aug-02 22:41

Dominik Reichl

29-Aug-02 22:41

This means that all following exported functions are in C style (and not C++, even if you are coding in C++).

If you declare something as C, you cannot use polymorphy (two functions with same name but different parameters). Every function has a unique name.

Using this declaration, you can use the DLL in Visual Basic or Pascal for example.

Big Grin | :-D

Dominik

Re: A question about a strange "extern" statement.

Tomasz Sowinski29-Aug-02 23:42