Re: problem with functions and variables... - C / C++ / MFC Discussion Boards

mark novak14-Apr-05 0:38

14-Apr-05 0:38

I've never experienced a pure virtual function call. However from what I hear it really can only happen in the constructor or in the deconstructor. Then off course it could be a side effect of using invalid pointers to these objects. Also MSVC6 has been known to allow abstract classes to be created in certain cases. It also never hurts to do a rebuild all. I’ve seen some really straight up weird occurrences cause me a good couple hours of confusion all completely melt with a simple rebuild all.

Service Control Manager types with MFC

sweep12313-Apr-05 3:41

sweep123

13-Apr-05 3:41

I have been trying to use the http://www.beyondlogic.org/porttalk/porttalk.htm[^]">PortTalk device driver to access the parallel ports of my PC.

The sample Console applications works OK, but when I try and use this code in a MFC application I get the following errors:-

c:\ParallelPortTest\ParallelPortTest\pt_ioctl.c(114): error C2065: 'SC_HANDLE' : undeclared identifier
c:\ParallelPortTest\ParallelPortTest\pt_ioctl.c(114): error C2146: syntax error : missing ';' before identifier 'SchSCManager'
c:\ParallelPortTest\ParallelPortTest\pt_ioctl.c(114): error C2065: 'SchSCManager' : undeclared identifier

I have tried many complier options but still get the above errors, any suggestions?

Re: Service Control Manager types with MFC

Alexander ^M.,13-Apr-05 3:55

Alexander ^M.,

13-Apr-05 3:55

Check the include files and the defines (maybe version conflict, MFC assumes windows NT 4.0 -> stdafx.h ).

Don't try it, just do it! Wink | ;-)

Re: Service Control Manager types with MFC

sweep12313-Apr-05 4:10

sweep123

13-Apr-05 4:10

Running Windows 2000 SP3 and have included stdafx.h, still lots of errors.

Re: Service Control Manager types with MFC

Ravi Bhavnani13-Apr-05 5:30

Ravi Bhavnani

13-Apr-05 5:30

Is winsvc.h being #included?

/ravi

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Re: Service Control Manager types with MFC

sweep12313-Apr-05 5:38

sweep123

13-Apr-05 5:38

Thanks, I included #include winsvc.h in the file that was giving the errors.

BUT now get the following Link Erros:-

ParallelPortTest error LNK2005: "void __cdecl outportb(unsigned short,unsigned char)" (?outportb@@YAXGE@Z) already defined in ParallelPortTest.obj
ParallelPortTest error LNK2005: "unsigned char __cdecl inportb(unsigned short)" (?inportb@@YAEG@Z) already defined in ParallelPortTest.obj
ParallelPortTest error LNK2005: "unsigned char __cdecl OpenPortTalk(void)" (?OpenPortTalk@@YAEXZ) already defined in ParallelPortTest.obj
ParallelPortTest error LNK2005: "void __cdecl ClosePortTalk(void)" (?ClosePortTalk@@YAXXZ) already defined in ParallelPortTest.obj

Do you know what libraries to include?

problem with functions and variables...

Green Fuze13-Apr-05 2:35

Green Fuze

13-Apr-05 2:35

Hey everybody! Smile | :)

I created 2 function.

<br />
void CHelperDlg::UpdateVars(void) //updates the vars in the options<br />
{<br />
  CFile fLinkAfter(m_strAppPath+"\\Settings\\LinkAfter.dat", CFile::modeReadWrite);<br />
<br />
  ReadFiles(m_clsOptions.m_OptionLinkAfter, fLinkAfter);<br />
	MessageBox(m_clsOptions.m_strOptionLinkAfter);<br />
}<br />
<br />
void CHelperDlg::ReadFiles(CString TheVar, CFile ReadedFile)<br />
{<br />
	char cBuffer[10];<br />
	UINT iRead;<br />
<br />
	iRead = ReadedFile.Read(cBuffer, 10);<br />
	TheVar = cBuf;<br />
}<br />

now, as far as I understand the var "m_clsOptions.m_OptionLinkAfter"
should get the content of the cBuf, and for some reason, the
"m_clsOptions.m_OptionLinkAfter" still remains empty after the other function is called (checked with the MessageBox).
(TheVar gets m_clsOptions.m_strOptionLinkAfter as its parameter)

shouldn't the ReadFiles function update m_clsOptions.m_strOptionLinkAfter???

THANKS!!!

Re: problem with functions and variables...

David Crow13-Apr-05 2:41

David Crow

13-Apr-05 2:41

Green Fuze wrote:
void CHelperDlg::ReadFiles(CString TheVar, CFile ReadedFile)

Change to:

void CHelperDlg::ReadFiles(CString &TheVar, CFile ReadedFile)

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: problem with functions and variables...

Green Fuze13-Apr-05 13:28

Green Fuze

13-Apr-05 13:28

Perfect!

and I think I just understood something really important!

thanks!

Re: problem with functions and variables...

Ryan Binns13-Apr-05 18:28

Ryan Binns

13-Apr-05 18:28

On top of that, make sure you pass your CFile object by reference or pointer, otherwise the state of the CFile object when returning from the function will be out of sync with the state of the operating system file handle.

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"

encrypt to database in vc++

nehathoma13-Apr-05 1:52

nehathoma

13-Apr-05 1:52

Do anyone know how to encrypt a data into a database in vc++?plz help me!!!

Re: encrypt to database in vc++

Yulianto.13-Apr-05 15:02

Yulianto.

13-Apr-05 15:02

What do you want to know? The encrypt method, or the encripting with vc++? You can google and find encrypt method.

<italic>Work hard, Work effectively and a bit of luck is the key to success.

Re: encrypt to database in vc++

ThatsAlok14-Apr-05 19:36

ThatsAlok

14-Apr-05 19:36

Hain Neha,
is code given by me is not working!

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A question on deleting entries in win registry

PrashantJ13-Apr-05 1:24

PrashantJ

13-Apr-05 1:24

Hi,

I am trying to delete a value from my windows registry through VC++ code. Tried using a couple of win API's like RegDeleteValue(), DelRegTree but did'nt really work.
May be I am passing incorrect arguments or I am using the wrong functions. I would appreciate if someone shares his/her views, may be the method to be used or so.

eg.
I have to delete XXX from the registry. This is how my registry looks.
HKEY_CURRENT_USER
Software
Something
ProductV1
ProductV2
XXX

Thanks

Re: A question on deleting entries in win registry

ThatsAlok13-Apr-05 1:42

ThatsAlok

13-Apr-05 1:42

Here is small Source code

#include <atlbase.h> //yes it is available in vc 6.0

CRegKey key;

if(key.Open(HKEY_CURRENT_USER,"Software\\Something\\ProductV1\\ProductV2")==ERROR_SUCCEESS)
{

//for deleting Value
   key.DeleteValue("XXX");
//for deleting subkey
   key.DeleteSubKey("123");

//close key
	key.Close();

}

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Re: A question on deleting entries in win registry

PrashantJ13-Apr-05 2:20

PrashantJ

13-Apr-05 2:20

Something has badly changed in .NET compared to vc 6.

I am getting an error
error C2065: 'CRegKey' : undeclared identifier

But I looked at .NET\atlbase.h, I see a class named CRegKey.

Anybody any ideas?

Thanks

Re: A question on deleting entries in win registry

David Crow13-Apr-05 2:30

David Crow

13-Apr-05 2:30

It's going to be hard to show what you did wrong if you don't show us the code that is not working.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: A question on deleting entries in win registry

PrashantJ13-Apr-05 2:32

PrashantJ

13-Apr-05 2:32

I copied and pasted the same code that Alok listed above.

Also included the header file #include <atlbase.h> in the source code. Thats all I did.

Thanks

Re: A question on deleting entries in win registry

David Crow13-Apr-05 2:39

David Crow

13-Apr-05 2:39

Ok, but what about the code that you had before CRegKey was suggested? There is no reason why you should not be able to get that working.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: A question on deleting entries in win registry

PrashantJ13-Apr-05 3:22

PrashantJ

13-Apr-05 3:22

I had tried this earlier. But RegDeleteValue always returns 2 (file not found error)

long retVal = RegDeleteValue(HKEY_CURRENT_USER, "Software\\Company Name\\Product Name\\File-TT");

Thanks

Re: A question on deleting entries in win registry

Blake Miller13-Apr-05 6:37

Blake Miller

13-Apr-05 6:37

Maybe for this one you need to use:

HKEY MyKey;<br />
<br />
LONG RegOpenKey(<br />
  HKEY_CURRENT_USER, "Software\\Company Name\\Product Name,<br />
  &MyKey<br />
);<br />
<br />
RegDeleteKey( <br />
  MyKey, <br />
  "File-TT"<br />
);<br />
<br />
RegCloseKey(MyKey);

You delete registry values by opening the entire key, you delete registry keys by opening the parent key and then calling RegDeleteKey with the name of the child.

Unicode C++ Problem

nitinmahajan8013-Apr-05 1:21

nitinmahajan80

13-Apr-05 1:21

Hi All,

I want to write a simple C/C++ program which should be able to display All Unicode characters, that are present in character set of any Standard Unicode Font.

I am using the wchar_t data type to store the character constant but how can i pass the Unicode value for a literal like HINDI Aa (\u0905)
But it will always give the error literal constant extends limit

Can Anyone help me out

Thanks In Advance
Nitin Mahajan

Re: Unicode C++ Problem

ThatsAlok13-Apr-05 1:36

ThatsAlok

13-Apr-05 1:36

Could you post some code snippet,so we can undertsand you problem in better way!

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Re: Unicode C++ Problem

nitinmahajan8013-Apr-05 18:57

nitinmahajan80

13-Apr-05 18:57

#include <conio.h>

#include <locale.h>
#include <iostream.h>
#include <stdlib.h>
#include <stdio.h>

int wmain( int argc, wchar_t *argv[ ], wchar_t *envp[ ] )
{
wchar_t wc = '\x0907';

cout<<wc;
getch();
}

now="" i="" am="" getting="" the="" error=""
ibcd.lib(wwincrt0.obj)="" :="" lnk2001:="" unresolved="" external="" symbol="" _wwinmain@16
and="" want="" to="" send="" this="" character="" <b="">wc to a notepad window for displaying the it there by pressing a button from my application. Is there any way you have for that?
I have tries the postmesage API but it doesn't work as:

PostMessage(HWND_BROADCAST,ch,WM_CHAR,0);

Thanks 4 Ur Reply

Re: Unicode C++ Problem

ThatsAlok13-Apr-05 19:15

ThatsAlok

13-Apr-05 19:15

nitinmahajan80 wrote:
int wmain( int argc, wchar_t *argv[ ], wchar_t *envp[ ] )

Isn't that Decalartion Right,WinMain Sig. is something like this

int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR      cmdLine,
                   int nShowCmd)

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