C / C++ / MFC

25-Apr-02 9:24

is there no simple way to delete a registry key? i have been looking and it seems it takes 20 lines of code just to delete a key..

i use :
WriteProfileString("Settings", "name", strName);

to store it, is it really that hard to remove it?

thanks for your advice!

-dz

Albert Pascual25-Apr-02 10:27

Albert Pascual

25-Apr-02 10:27

LONG RegDeleteKey(
HKEY hKey, // handle to open key
LPCTSTR lpSubKey // subkey name
);

That's the function I use!

Al

dazinith25-Apr-02 10:33

25-Apr-02 10:33

well part of the problem is that i dont know the HKEY, the WriteProfileString() function takes different values, and I'm not sure how to find out what the HKEY is, is there a command to get it somehow?

thanks for the responce!

-dz

Albert Pascual25-Apr-02 10:44

Albert Pascual

25-Apr-02 10:44

You could open the registry with:

LONG RegOpenKeyEx(
HKEY hKey, // handle to open key
LPCTSTR lpSubKey, // subkey name
DWORD ulOptions, // reserved
REGSAM samDesired, // security access mask
PHKEY phkResult // handle to open key
);

And the delete it with:

DWORD SHDeleteKey(
HKEY hkey,
LPCTSTR pszSubKey
);

Or:
LONG DelRegTree(
HKEY hParentKey,
const CString& strKeyName
);

However yoiu need the HKEY you can open it to get the HKEY with the SubKey from WriteProfileString()

Oh! Are you asking in MC++? You see I don't know if this question is for MC++ or C++ because we don't have a MC++ forum ... yet

Poke tongue | ;-P

So if you are using MC++ remember to
[DllImport("user32.dll")]
Poke tongue | ;-P

Joke a part, hope this help. That's all I know about the registry, somebody else may be able to help

Joaquín M López Muñoz25-Apr-02 10:35

25-Apr-02 10:35

I guess you refer to the inability of RegDeleteKey to delete keys recursively in NT/2000/XP (the same function recursively deletes keys in 95/98/ME). The function

<a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/Shell/reference/shlwapi/registry/shdeletekey.asp">SHDeleteKey</a>

, on the other hand, deletes keys in a recursive manner for both families of OSs --and it's only one line of code.
Caveat: SHDeleteKey is not present in 95 and NT 4.0 systems without IE 4.0 or higher. It is provided by default in later OSs.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

dazinith25-Apr-02 10:44

25-Apr-02 10:44

I must not be phrasing something right.. i have a variable in the registry 'key' under the following path:
HKEY_CURRENT_USER/Software/DeveloperName/Program/Settings/

the value is called 'UserName' and it is set to a string

to set this value i call:
WriteProfileString("Settings", "UserName", "Fred Smith");

I cannot figure out how to use the RegDeleteKey() function because it takes an HKEY variable type, how do i find out this value? i have tried passing the path and the value to delete, but that doesnt work..

hope that clarifies?

-dz

Albert Pascual25-Apr-02 10:50

Albert Pascual

25-Apr-02 10:50

HKEY myKey;

LONG RegOpenKeyEx(HKEY_CURRENT_USER,
"/Software/DeveloperName/Program/Settings/",
0,
0,
&myKey);

And the delete it with:

DWORD SHDeleteKey(HKEY myKey,
"/Software/DeveloperName/Program/Settings/"
);

To delete a value is something like:
LONG RegDeleteValue(
myKey, // handle to key
LPCTSTR lpValueName // value name
);

Hope this helps!

Al

Joaquín M López Muñoz25-Apr-02 10:55

25-Apr-02 10:55

I must not be phrasing something right

Yep, I misundesrstood your question. sorry. If I got it now, the way to delete a given key is by calling RegDeleteKey like this:

::RegDeleteKey(
  HKEY_CURRENT_USER,
  CString(AfxGetApp()->m_pszRegistryKey)+"\\"+AfxGetApp()->m_pszProfileName+"\\Settings\\UserName");

(Sort of, I haven't tested it.)

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

dazinith25-Apr-02 11:37

25-Apr-02 11:37

I tried your solution, as well as Pascal's, neither give any errors, but neither delete the key.. i traced the string before calling the RegDeleteKey() and the path looks exactly as it does in regedit, but the key never gets deleted..

-dz

Joaquín M López Muñoz25-Apr-02 11:54

25-Apr-02 11:54

!! I don't have any compiler handy, but I'll give this a try tomorrow morning (CET) and tell you back (in case you haven't found the solution yet.)

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Joaquín M López Muñoz25-Apr-02 20:16

25-Apr-02 20:16

This is the shortest solution I found (it really works, I tried it):

HKEY hKey=NULL;
::RegOpenKeyEx(
    HKEY_CURRENT_USER,
    CString("Software\\")+AfxGetApp()->m_pszRegistryKey+"\\"+AfxGetApp()->m_pszProfileName+"\\Settings",
    0,KEY_WRITE,&hKey);
::RegDeleteValue(hKey,"name");
::RegCloseKey(hKey);

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

dazinith26-Apr-02 3:52

Transfer the data between PropertyPage

26-Apr-02 3:52

thanks a bunch Smile | :)

-dz

ado

Drawil25-Apr-02 8:05

Drawil

25-Apr-02 8:05

hi every body

i added a microsoft ado data control after that many classes added to my workspace such as C_Recordset.., i need any help or example to know how connect and make a query.

Best Regards Smile | :)

Re: ado

Mazdak25-Apr-02 9:03

Mazdak

25-Apr-02 9:03

They are lot of articles in CP. Maybe you can find it there.

http://www.codeproject.com/database/

Mazy

"The path you tread is narrow and the drop is shear and very high,
The ravens all are watching from a vantage point near by,
Apprehension creeping like a choo-train uo your spine,
Will the tightrope reach the end;will the final cuplet rhyme?"Cymbaline-Pink Floyd

Re: ado

Philip Patrick25-Apr-02 9:14

Philip Patrick

25-Apr-02 9:14

Also look in MSDN, you will find some good examples there too Smile | :)

Philip Patrick
Web-site: www.stpworks.com
"Two beer or not two beer?" Shakesbeer

Need Web-based database administrator? You already have it!

Eugene Pustovoyt25-Apr-02 7:51

Eugene Pustovoyt

25-Apr-02 7:51

Help me please, how transfering the info between two Property Pages, inserting into the Property Sheet?

Best regards,

Eugene Pustovoyt

Sonork ID 100.10002:Yaumen

Joaquín M López Muñoz25-Apr-02 8:32

25-Apr-02 8:32

There's no standard way to do that as far as I know, so you can just use your imagination Smile | :)

Off the top of my hat, one method is as follows. Derive CMyPropertySheet from CPropertySheet and add member variables to hold the common data. When exiting a property page, store the relevant data into the parent:

BOOL COnePropertyPage::OnKillActive()
{
  if(!CPropertyPage::OnKillActive())return FALSE;
 
  // store data into the parent
  static_cast<CMyPropertySheet*>(GetParent())->m_commonData=...;
  return TRUE;
}

and retrieve in the other property pages at OnSetActive, you get the idea.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Eugene Pustovoyt25-Apr-02 18:55

Eugene Pustovoyt

25-Apr-02 18:55

As the variant, it approaches me!

Thank for the help

Best regards,

Eugene Pustovoyt

Sonork ID 100.10002:Yaumen

lucy25-Apr-02 8:49

lucy

25-Apr-02 8:49

Besides the method provided by Joaquín M López Muñoz, I have a Unsure | :~

way to do it.
Since propertypage is in fact a dialog, when you add them to your propertysheet, you have an object of each page already. say:
CPageD1 m_d1;
CPageD2 m_d2;
CPropertySheet m_sheet;
....
m_sheet.AddPage(&m_d1);
m_sheet.AddPage(&m_d2);
....
m_d1.m_data1 = m_d2.m_data2;

Can't you do this?