C / C++ / MFC

Class inheritance problems

23-Jun-04 4:32

No trick, just use InsertString().

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

Re: Combobox question

LukeV23-Jun-04 4:34

LukeV

23-Jun-04 4:34

Yeah I know... that was pretty dumb from my part Blush | :O

Thanks guys!

User 665823-Jun-04 2:39

23-Jun-04 2:39

Hi!

I can't derive my CBaseRenderer class from CD3DBase, here's my code:

#pragma once

class CD3DBase;

class CBaseRenderer : public CD3DBase
{
public:
	CBaseRenderer(void);
	~CBaseRenderer(void);

public:
	void OnLostDevice();
	void OnResetDevice();
	void OnFrameMove();
	void OnRender();
	void OnInitVolatileResources();
	void OnFreeVolatileResources();
};

and these are the errors:

------ Build started: Project: DXProject, Configuration: Release Win32 ------<br />
<br />
Compiling...<br />
CBaseRenderer.cpp<br />
e:\C++\DXProject\CBaseRenderer.h(7) : error C2504: 'CD3DBase' : base class undefined<br />
DXProject.cpp<br />
e:\C++\DXProject\CBaseRenderer.h(7) : error C2504: 'CD3DBase' : base class undefined<br />
CD3DBase.cpp<br />
e:\C++\DXProject\CBaseRenderer.h(7) : error C2504: 'CD3DBase' : base class undefined<br />
CApplication.cpp<br />
e:\C++\DXProject\CBaseRenderer.h(7) : error C2504: 'CD3DBase' : base class undefined

What's wrong with this code? Frown | :(

regards

modified 12-Sep-18 21:01pm.

Johnny ²23-Jun-04 2:53

Johnny ²

23-Jun-04 2:53

You must include the header for the definition of CD3DBase. If you are deriving from a class then it is not enough just to have a forward reference, you need the full class available.

User 665823-Jun-04 2:57

23-Jun-04 2:57

Ok thanks, but if I include the header, I get even more errors, since CBaseRenderer and CD3DBase include each other, because CD3DBase needs to create an object of CBaseRenderer

modified 12-Sep-18 21:01pm.

Johnny ²23-Jun-04 3:12

Johnny ²

23-Jun-04 3:12

You could put a forward declaration of CBaseRenderer into CD3DBase.h

User 665823-Jun-04 3:20

23-Jun-04 3:20

Ok, next errors Big Grin | :-D

#pragma once

/* includes */

class CBaseRenderer;

class CD3DBase
{
    /* ... */
private:
    CBaseRenderer gRenderer;
};

And here the errors:

e:\C++\DXProject\CD3DBase.h(46) : error C2079: 'CD3DBase::gRenderer' uses undefined class 'CBaseRenderer

modified 12-Sep-18 21:01pm.

David Crow23-Jun-04 3:26

23-Jun-04 3:26

You're missing #include "BaseRenderer.h" or you can make gRenderer a pointer.

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

User 665823-Jun-04 3:33

23-Jun-04 3:33

tried both. this eliminated all errors, except that now I get this one again:

e:\C++\DXProject\CBaseRenderer.h(5) : error C2504: 'CD3DBase' : base class undefined

#pragma once
#include "CD3DBase.h"

class CBaseRenderer : public CD3DBase
{ ...

but well...since I only need a pointer to an IDirect3DDevice9 from CD3DBase, I might also create a function to pass this one as a parameter and make CBaseRender not to inherit from CD3DBase.

modified 12-Sep-18 21:01pm.

error C2593: 'operator +=' is ambiguous (watch my code)

suiram4023-Jun-04 8:32

suiram40

23-Jun-04 8:32

you have a dependecy loop.

"a.h" file includes "b.h"
and "b.h" file includes "a.h"

when you derive the derivated class has to know the type tou derive from so you need the definition of the type not the declaration
of that type.

anderslundsgard23-Jun-04 2:24

anderslundsgard

23-Jun-04 2:24

How come that this line will compile in VS 6.0 but not in VS 7.0?

strOut += strData[iPos] ^ strKey[iKeyPos++];

strOut, strData and strKey are Cstring.
IPos and iKeyPos is int.

I got the compiler error: C2593: 'operator +=' is ambiguous (watch my code)

Thanks

_____________________________

...and justice for all

APe

Re: error C2593: 'operator +=' is ambiguous (watch my code)

David Crow23-Jun-04 3:21

Re: error C2593: 'operator +=' is ambiguous (watch my code)

23-Jun-04 3:21

d00_ape wrote:
How come that this line will compile in VS 6.0 but not in VS 7.0?

Actually, with warning level 4, VS6 also complains.

d00_ape wrote:
I got the compiler error: C2593: 'operator +=' is ambiguous (watch my code)

Of the various CString += operators, more than one of them matches the strData[iPos] ^ strKey[iKeyPos++] return value. Does this help:

strOut += (char) (strData[iPos] ^ strKey[iKeyPos++]);

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

anderslundsgard29-Jun-04 22:44

anderslundsgard

29-Jun-04 22:44

DavidCrow wrote:
strOut += (char) (strData[iPos] ^ strKey[iKeyPos++]);

It really helped. And still work with that XOR. THANKS!!

_____________________________

...and justice for all

APe

Re: error C2593: 'operator +=' is ambiguous (watch my code)

V.23-Jun-04 3:23

23-Jun-04 3:23

Don't know why you get the error but try this:

strOut += strData[iPos];<br />
strOut +=  strKey[iKeyPos++];

Could be that this works. (else you still can use strOut.append(...))

Good luck.

"If I don't see you in this world, I'll see you in the next one... and don't be late." ~ Jimi Hendrix

Re: error C2593: 'operator +=' is ambiguous (watch my code)

jmkhael23-Jun-04 7:25

jmkhael

23-Jun-04 7:25

He lost the XOR operation this way

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

How to hide col. in listview

Sumit Kapoor23-Jun-04 1:53

Sumit Kapoor

23-Jun-04 1:53

Hi..

Plz help me..
How to Hide column from listview.
even one drag width of other col. then it'll not display..
means... if we setWidth=0, then even your cannot show that fields..
Bye

---Sumit Kapoor--- sumit_kapoor1980@hotmail.com

computer names in local network

windsock23-Jun-04 1:30

windsock

23-Jun-04 1:30

Hi
I am calling a dialog box including a list control window.

This dialog box has computer names in local network.

I'ts using 'WNetOpenEnum' and 'WNetEnumResource' APIs.

Now I have used this code successfully in Windows 2000/XP.

But these codes got empty in Windows 98.

Nothing in list control.

Is a problem of network setting or not enough APIs to get names?

How can I do that?

anyone any ideas ?

Help me plz.

---- source list ---

void CNetworkDlg::SearchLocalPc(void)
{
// WNetOpenEnum parameter
DWORD dwScope = RESOURCE_CONTEXT;
NETRESOURCE *NetResource = NULL;
HANDLE hEnum;

// WNetOpenEnum for Windows 98. but Nothing in return value
unsigned long strWNetMSG = WNetOpenEnum(dwScope, RESOURCETYPE_ANY, NULL, NULL, &hEnum);

// for error
switch(strWNetMSG)
{
case NO_ERROR:
break;
case ERROR_NOT_CONTAINER:
AfxMessageBox("ERROR");
break;
case ERROR_INVALID_PARAMETER:
AfxMessageBox("ERROR");
break;
case ERROR_NO_NETWORK:
AfxMessageBox("ERROR");
break;
case ERROR_EXTENDED_ERROR:
AfxMessageBox("ERROR");
break;
default :
AfxMessageBox("ERROR");
return ;
}

// SOCKET creation
WSADATA wsaData;
WSAStartup(MAKEWORD(1, 1),&wsaData);

// if WNetOpenEnum success
if (hEnum)
{
// for WNetEnumResource
DWORD dwCount = 0xFFFFFFFF;
DWORD dwBufferSize = 16384;
LPVOID lpBuffer = new char[16384];

// continues a network-resource enumeration but Nothing in return value
unsigned long strWNetResourceMSG = WNetEnumResource(hEnum, &dwCount, lpBuffer, &dwBufferSize);

NetResource = (NETRESOURCE*)lpBuffer;

// for error
switch(strWNetResourceMSG)
{
case ERROR_MORE_DATA:
AfxMessageBox("ERROR");
break;
case ERROR_INVALID_HANDLE:
AfxMessageBox("ERROR");
break;
case ERROR_NO_NETWORK:
AfxMessageBox("ERROR");
break;
case ERROR_EXTENDED_ERROR:
AfxMessageBox("ERROR");
break;
default:
break;
}

if(m_ListSearchPc.GetItemCount() != 0)
m_ListSearchPc.DeleteAllItems();

m_dwCountTotalPc = 0;
for(unsigned int i = 0; i < dwCount; i++, NetResource++)
{
if (NetResource->dwUsage == RESOURCEUSAGE_CONTAINER && NetResource->dwType == RESOURCETYPE_ANY)
{
if (NetResource->lpRemoteName)
{
CString strFullName = NetResource->lpRemoteName;

if (strFullName.Left(2).Compare("\\\\") == 0)
strFullName = strFullName.Right(strFullName.GetLength() - 2);

if(strFullName.IsEmpty())
continue;

// 1. add number to list contorl
CString pcNo;
pcNo.Format("%d", m_dwCountTotalPc + 1);
m_ListSearchPc.InsertItem(m_dwCountTotalPc, pcNo);

// 2. add pc aname to list control
strFullName.MakeLower();
m_ListSearchPc.SetItemText(m_dwCountTotalPc, 1, (LPCTSTR)strFullName);
m_dwCountTotalPc++;
}
}
}
delete lpBuffer;
WNetCloseEnum(hEnum);
}
WSACleanup();

CString total;
total.Format("%d", m_dwCountTotalPc);
CString PopupMessage;
PopupMessage = "Number of Total Pc :";
PopupMessage += total;
SetDlgItemText(IDC_TEXT_LOCALPC_EA, LPCTSTR (PopupMessage));

UpdateData(FALSE);

}

Re: computer names in local network

David Crow23-Jun-04 3:36

Re: computer names in local network

23-Jun-04 3:36

When you say "nothing in return value," does that mean that WNetOpenEnum() is returning NO_ERROR?

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

windsock23-Jun-04 18:31

windsock

23-Jun-04 18:31

Yes. WNetOpenEnum() is returning NO_ERROR.

Re: computer names in local network

David Crow24-Jun-04 3:52