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writing to HKEY_LOCAL_MACHINE??

Posted on 1998-11-02
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Last Modified: 2013-11-20
Using RegCreateKeyEx it seems that I cannot create a regestry key under HKEY_USERS or HKEY_LOCAL_MACHINE.  Is there a way to get around this problem?
If possible I'd like to steer away from CWinApp class members too.. - is this possible?

Tim
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Question by:TimB
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Expert Comment

by:plaroche
ID: 1324163
What kinds of problems are you having?

I write to HKEY_LOCAL_MACHINE\Software quite easily and it works fine.  Are you under NT? If so have you checked that the logged user is administrator of the machine? I think it's needed to write to that registry section.
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Accepted Solution

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gunn earned 130 total points
ID: 1324164
Try this function that I often use on WindowsNT/95/98, flawlessly ;)

-Tom

#define D_KEY "SOFTWARE\\Company\\WhateverElse"

char* GetRegKeyCT()

{

  long status;

  HKEY  hKey;

  DWORD type, datasize;

  BYTE *data;



  // Open the Key in the Windows Registry

  status = RegOpenKeyEx( HKEY_LOCAL_MACHINE,

                D_KEY,

                0,

                KEY_QUERY_VALUE,

                &hKey );



  // Check for error in opening

  if( status != ERROR_SUCCESS )

    return NULL;



  // Get the data size of the key first
   // "current_version" being the string you want to get...

  status = RegQueryValueEx( hKey, "current_version", NULL, &type, NULL, &datasize );

  if( datasize == 0 || status != ERROR_SUCCESS )

    return NULL;



  // Allocate the memory for the buffer then get the

  // data again, this time putting it into buffer.

  data   = (unsigned char*)malloc( (size_t)datasize );
   
   // "current_version" being the string you want to get...

  status = RegQueryValueEx( hKey, "current_version", NULL, &type, data, &datasize );



  // Check for error in obtaining data

  if( status != ERROR_SUCCESS )

    return NULL;



  // Close the open key

  status = RegCloseKey( hKey );



  return (char*)data;

}


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Expert Comment

by:gunn
ID: 1324165
Ahhhhhhhhh, stupid me ;)

I read it, thinking 'ahh! I have done that!, only to (after posting the "answer") find out after reading -again- the question, that you were looking for way to *create* the key....doh!  I have done that too, but don't have the code at my fingertips....

sorry about that, you can reject my answer ;(

-Tom

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LVL 1

Author Comment

by:TimB
ID: 1324166
Thanks for the help,  I figured out how to create a key under HKLM, I think it was just me not being able to understand mocrosoft help files - doh!

Here's what I did in the end:

RegCreateKeyEx(HKEY_LOCAL_MACHINE,      // handle of an open key
                  StrKeyPath, //  address of subkey name
                  0, // address of class string
                  NULL, // special options flag
                  0, //
                  KEY_SET_VALUE,  
                  NULL,
                  &hKey,
                          NULL) == ERROR_SUCCESS)


Thanks for your help anyway, and here's 130 points,

Bye-ee ;)

Tim
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