C / C++ / MFC

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

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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Alok Gupta
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PrashantJ13-Apr-05 2:20

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

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

PrashantJ13-Apr-05 2:32

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

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

PrashantJ13-Apr-05 3:22

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

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

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

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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Alok Gupta
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nitinmahajan8013-Apr-05 18:57

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

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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nitinmahajan8014-Apr-05 0:36

14-Apr-05 0:36

No Mr Alok,

This is used only when we are making the MFC DLL but i am making the Win32 Application

And what about Postmessage that i am asking abot have u got any idea.

I am presently loking for WM_UNICHAR windows message to be send as parameter in Postmessage API which is not implemented for versions before windows XP

Michael Dunn13-Apr-05 2:04

Michael Dunn

13-Apr-05 2:04

VC doesn't support the \u syntax, but this should work: L'\x905'

--Mike--
Visual C++ MVP Cool | :cool:

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Strange things are afoot at the U+004B U+20DD

nitinmahajan8014-Apr-05 0:44

How to configure Baudrate 76800

14-Apr-05 0:44

I have done that & so far i am successful in displaying string in the AfxMessage dialog box. But my problem is that I want to write the data into the file or to the notepad.
For this i am using the concept of :
i}
wmain()
{
wchar_t tch = L'\x311b';
TCHAR *tstring;

...

_stprintf(tstring,_T("Tchar Character : %su"),(LPCTSTR)tch);
...
}

2}
PostMessage , SendMessage API and trying to pass WM_UNICHAR message to that but till now not succesful

Adi Narayana Vemuru13-Apr-05 0:45

Adi Narayana Vemuru

13-Apr-05 0:45

Hello guys,

Requirement:My Application should work with any baudrate starting from 01- 256k ideally and i need to implement for 76800 baud with out fail.

Constraint:We are able configure the bauds from 0 - 9600 (all the numbers), 10400,14400,19200,38400,56000,57600,etc..... when i give different baudrate from the above list, the error comes is Invalid Parameter.

Question: Is there any work around to overcome this constraint.It's really urgent.

can someone through light on this.????

Thanks in advance.
Adi

Roger Allen13-Apr-05 5:40

Roger Allen

13-Apr-05 5:40

I take it your tryig to set the baud rate through a DCB structure and the BaudRate member.

Ar eyou setting it like this:

dcb.BaudRate = 76800;

The other issue could be that some of the othere DCB parameters are not filled out correctly.

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Adi Narayana Vemuru13-Apr-05 18:13

Adi Narayana Vemuru

13-Apr-05 18:13

Hello Roger,

Thanks for your response. Yes i'm setting the baudrate and other configuration parameters of serial port using DCB structure only with SetCommState() Function.

so when i use baudrates like 76800, the return value of SetCommState() function is INVALID_PARAMETER. So i want to know if anyone has done something to achieve this kinda baudrates configured with serial port for their requirements.

Thanks
Adi

Trollslayer13-Apr-05 23:40

Trollslayer

13-Apr-05 23:40

Some systems (drivers) have a list of accepted baud rates, I'm not sure if that could be your problem. Certainly on standard PC serial ports the hardware only allows a limited selection of baud rates and the driver will reflect this.

Elaine Rose | [Rose]

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