Re: OpenGL - C / C++ / MFC Discussion Boards

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Re: Linked list help?!

Christian Graus7-Jun-01 13:23

Christian Graus

7-Jun-01 13:23

A linked list can be singly or doubly linked, as the other reply said. You can do it two ways - first make the end nodes of a different class or ( my preference ) simply make the pointers NULL if you are at an end ( i.e. the last one has NULL for the next item, the first NULL for previous if doubly linked ).

I absolutely appluad you for writing your own linked list, but unless it does something special that a normal one doesn't do, I'd recommend using the STL for your container classes. You get to write code that will compile anywhere, lots of algorithms for free, etc. Write your own for sure, so you know how it all works, but then use the standrd one.

Christian

#include "std_disclaimer.h"

People who love sausage and respect the law should never watch either one being made.

The things that come to those who wait are usually the things left by those who got there first.

NT compilation and linking time

7-Jun-01 1:47

Does anyone knows or have an idea of how long does it take to do a full compilation of the Windows NT operating system. No, I DO NOT have the source code for the OS but would like to use the information as reference in a document on source code organization I am putting together at work.

Thanks in advance.

Accessing records through Recordset Pointer

yamini7-Jun-01 1:42

yamini

7-Jun-01 1:42

Hi ,
I have ATL Component with it's interface exposing a method which will pass the Disconnected Recordset pointer.
At the client side,I can get this Recordset pointer.But, I could not access this Recordset Pointer as it gives error that
"The operation requested by the application is not allowed if the object is closed ".I should not create another Recordset pointer on the client side.How can I rectify the problem ?

Thanx in advance for the help.

Regards,
yamini.

Re: Accessing records through Recordset Pointer

Phil Boyd7-Jun-01 3:21

Phil Boyd

7-Jun-01 3:21

Did you AddRef the recordset pointer before you returned it?

Phil Boyd
MCP

"I took the road less traveled..."

Re: Accessing records through Recordset Pointer

yamini7-Jun-01 20:16

yamini

7-Jun-01 20:16

Hi,
I tried to AddRef the Recordset pointer before returning . But, it did not work.
The function prototype at Server .

HRESULT GetAllElements([out,retval]_Recordset **ppRecordset);

The code at the client goes this way.

void main()
{
//Creating an instance of the Component and getting the Interface say Idemo
_Recordset *ppRecordset;
Idemo->GetAllElements(&ppRecordset);
if(SUCCEEDED(hr))
{
ppRecordset->MoveFirst //Here I am getting the Error that if object is closed can't do the operation requested by the Application.
}
}

I must not create another Recordset at the Client side .

Thanx in advance for the help.

Regards,
yamini.

OpenGL

7-Jun-01 0:53

Hi,
Sorry if this is the wrong place to ask, but how do you get an outline for say a solid filled box; the only way i could think of is to render the filled box first, then render the outline.. anyone know a better way??
Cheers

Re: OpenGL

Michael P Butler7-Jun-01 1:30

Michael P Butler

7-Jun-01 1:30

There is a lot of useful OpenGL stuff at http://www.opengl.org/developers/code/tutorials.html and of course http://www.opengl.org itself.

Hope some of it helps,

Michael Smile | :)

Re: OpenGL

Ulf Öhlén9-Jun-01 22:56

Ulf Öhlén

9-Jun-01 22:56

Drawing the box twice is fine, but you have to use polygon offsets or there will be some ugly effects.

glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
glEnable(GL_POLYGON_OFFSET_FILL); // Enable polygon offset
glPolygonOffset(1.0f, 1.0f);
DrawMyBox(); // Draw filled box
glDisable(GL_POLYGON_OFFSET_FILL);

glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
DrawMyBox(); // Draw outlined box

--------------
"Criticism is often constructive because it makes you feel superior when you give it"
-- Dogbert

SimpleFrame and Windowless

7-Jun-01 0:30

I Want Create ActiveX Control.
Contain other AcitveX in it.
and Transparent Picture. Smile | :)

Re: SimpleFrame and Windowless

Michael P Butler7-Jun-01 0:33

Michael P Butler

7-Jun-01 0:33

Sounds like you need a composite control. The ATL object wizard will allow you to create one.

Copying files

confalonieri6-Jun-01 23:29

confalonieri

6-Jun-01 23:29

Hi.
In my Visual C++ application, I have to copy some files from a directory to another one.
How can I do that ?

Thanks.

Re: Copying files

Tomasz Sowinski6-Jun-01 23:37

Tomasz Sowinski

6-Jun-01 23:37

Use SHFileOperation or CopyFile.

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

Display data in Dialog Box

louis6-Jun-01 23:10

louis

6-Jun-01 23:10

Hi there,

I can't seem to display my data received from a host PC in my listbox which is placed in a dialog, using an SDI application.
this code however works fine when I used a single dialog application.

Can someone please help.

here are some code.

/****************************************/
//MySocket.h
/***************************************/
....
....
....
class CMyListBox;
/////////////////////////////////////////////////////////////////
/// CMySocket command target
class CMySocket : public CAsyncSocket
{
// Attributespublic:
// Operations
public:
char m_charBuff[sizeof(RcvStvRec)];
UINT m_nSendersPort;
CString m_strSendersIP;
CMySocket();
virtual ~CMySocket();
// Overrides
public:
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CMySocket)
public:
virtual void OnReceive(int nErrorCode);
//}}AFX_VIRTUAL............}

/***************************************/
//MySocket.cpp
/***************************************/
void CMySocket::OnReceive(int nErrorCode)
{
if (m_bActivateDlg)
{ if (m_pModeless == NULL)
{
m_pModeless = new CMyListBox;
m_pModeless->Create(IDD_DIALOG2);
m_pModeless->ShowWindow(TRUE);
}
m_bActivateDlg = FALSE; // create modeless dialog box only once }

int nError = ReceiveFrom (m_charBuff, sizeof(m_charBuff),m_strSendersIP, m_nSendersPort);

MoveMemory(&RcvStv, &m_charBuff, sizeof(TRcvStvRec));

CMyListBox *Ref=(CMyListBox *)AfxGetApp()->m_pMainWnd;
Ref->UpdateListBox(); // function in MyListBox.cpp CAsyncSocket::OnReceive(nErrorCode);
}

/******************************************/
//MyListBox.h
/******************************************/
...
....
.....
# include "MySocket.h"
class CMySocket;
////////////////////////////////////////////////////////////////////////////
/// CMyListBox dialog
class CMyListBox : public CDialog
{
// Construction
public:
int m_nCount, m_nListCount;
CListBox *pList;
void UpdateListBox ();
CMyListBox(CWnd* pParent = NULL);
// standard constructor
...
....
.....
}

/******************************************/
//MyListBox.cpp
/******************************************/
void CMyListBox::UpdateListBox()
{
CString Rv, RCount;
pList = (CListBox *) (GetDlgItem(IDC_LIST1));

if ((m_nListCount = pList->GetCount()) > 50)
{
pList->ResetContent(); // clear listbox when full
}

RCount.Format("%d ", m_nCount);
Rv.Format("%d, %10.3f, %10.3f, %10.3f", RcvStv.Int1, RcvStv.X1, RcvStv.Y1, RcvStv.Z1);
pList->AddString("Rcv " + RCount + "Int " + Rv);

m_nCount = m_nCount + 1; // general counter
}

Thanks.

Re: Display data in Dialog Box

Masaaki Onishi7-Jun-01 4:16

Masaaki Onishi

7-Jun-01 4:16

Hello, the codegurus around the world.;)

CMyListBox *Ref=(CMyListBox *)AfxGetApp()->m_pMainWnd;
ASSERT(Ref); //You will get the assertion failure.
Ref->UpdateListBox();

As long as you use the dailog based application, the above lines is OK
because m_pMainWnd is same as m_pModeless.
However, if you use SDI,m_pMainWnd is the application object of your SDI.
So, I think that this simple works.

if (m_pModeless) {
   m_pModeless->SetFocus(); //might need to execute the process?
   m_pModeless->UpdateListBox();
}

Have a nice day!

-Masaaki Onishi-

Re: Display data in Dialog Box

louis7-Jun-01 21:20

louis

7-Jun-01 21:20

Thank you.
It works.

Blush | :O

Get number of 1s in a set of binary numbers

hearties6-Jun-01 23:04

hearties

6-Jun-01 23:04

is there a functions of method where I can obtain the number of 1s in a set of binary numbers?

eg. I have
data = 59; //00111011;

and I get
nCount = 5; // since there are 5 ones in the binary equivalent of 59

Thanks in advance.

Re: Get number of 1s in a set of binary numbers

Mark Jones6-Jun-01 23:53

Mark Jones

6-Jun-01 23:53

This should do what you want.

int GetHighBitCount(int i)
{
int iResult=0;

while (i)
{
// Mask for least significant bit of 'i'
if (i & 0x00000001)
iResult++;

// Right shift 'i' by one bit
i >>= 1;
}

return iResult;
}

Mark Jones

Software Engineer
Hampshire
UK

Re: Get number of 1s in a set of binary numbers

markkuk7-Jun-01 0:38

markkuk

7-Jun-01 0:38

#include <iostream>
#include <bitset>

int main(int argc, char* argv[])
{
    unsigned long data = 59;
    int nCount = std::bitset<32>(data).count();

    std::cout << nCount << endl;
    return 0;
}

This asssumes 32 bit longs, I don't remember the correct way to portably get the number of bits in a type.

previewing word documents

Kannan Kalyanaraman6-Jun-01 21:19

Kannan Kalyanaraman

6-Jun-01 21:19

hi,

I wanted to write an application similar to that of MS Word Viewer. Is it possible to identify the dll that is used by
ms word viewer and then use it in my application programmatically. If this is not possible, I would like to know,is there
by any means i can preview the content of the word document, in my application with/without using Automation. The user should not be able to edit or alter settings.
Thanks in advance.

Cheers
Kannan

Chart in VC++ MFC

Aky6-Jun-01 19:59

Aky

6-Jun-01 19:59

where can i get source code for Creating a chart using MFC with values from a Database?

Re: Chart in VC++ MFC

Christian Graus7-Jun-01 13:29

Christian Graus

7-Jun-01 13:29

Just read some GDI tutorials - drawing a chart is pretty easy unless you want it to look like Excel. If you do, you can use Excel as a COM object ( although this means you require Excel ), or spend a bit more time learning how to draw 3D circles, etc. But a basic pie/bar/point graph is easy, you just need to learn how to draw lines & curves.

Christian

#include "std_disclaimer.h"

People who love sausage and respect the law should never watch either one being made.

The things that come to those who wait are usually the things left by those who got there first.

What's wrong with my code? (class template)

Li Lirong6-Jun-01 19:25

Li Lirong

6-Jun-01 19:25

I have the following codes, all of them are in the same file "test.cpp"

//declaration
template <class T> class temp
{
public:
    class nested
        {
        public:
            void test();
        };

    void test()
    {
        nested nes;
        nes.test();
    }
};

//definition
template <class T>
void temp<T>::nested::test()
{}

int main( /* int argc, char* argv[] */ )
{
    temp<int> tem;
    tem.test();
    return 0;
}

error message:
test.obj : error LNK2001: unresolved external symbol
"public: void __thiscall temp<int>::nested::test(void)"
(?test@nested@?$temp@H@@QAEXXZ)
test.exe : fatal error LNK1120: 1 unresolved externals

what's wrong with my code?
thanks
Cry | :((

Lirong

Re: What's wrong with my code? (class template)

Vivek Rajan6-Jun-01 20:00

Vivek Rajan

6-Jun-01 20:00

Lirong -

Pls try reposting with "<" and ">" for the < and > symbols.
Some key statements are missing..

But I think I might know the answer, some compilers are really anal about this stuff. They expect all template functions to be defined in one file (.h or .cpp), in other words ONE Translation Unit.. (boo hoo !! ) I suspect VC++ is one of those compilers. ( Maybe an expert can confirm).

So, try writing the "test" function of the inner class within the class defn. things should be ok.

Eg.
...
class nested {
public:
void test()
{
// put your function body here
};
...

Hooe this helps-
Vivek

Re: What's wrong with my code? (class template)

Li Lirong6-Jun-01 21:02

Li Lirong

6-Jun-01 21:02

Thanks.

I have made some correctness on my question;

Yes, If I write the definition of "test" of the nested class within the class declaration, it does work.

So my question is:
Is it possible to separate the definition and declaration of a function of a nested class ( which is nested in a template ).

Is there anything wrong with my syntax?
Or it is just because of the compiler(vc++6)?

Thanks.

Lirong

Re: What's wrong with my code? (class template)

7-Jun-01 4:23

Lirong -

Unfortunately, if you have a class template.. you gotta put the nested method code within the class definition. (ie *.h file)

You did nothing wrong. It is just VC++ 6.0. ( actually many other compilers are also guilty)

Later-
Vivek

Last Visit: 31-Dec-99 18:00 Last Update: 5-May-24 1:40

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