Using C++ to edit the registry

Question

I have a limited c++ background and I would like to edit the registry. For example, I want to grab the value of HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\NoDriveTypeAutoRun and check to see if 0x20 is in it, and then if it is, subtract 0x20 from it's value and write it back (and kill and restart explorer.exe but I can figure that out on my own).

How would you do it?

Solution 1

• Open the registry : RegOpenKeyEx

• Query the value : RegQueryValueEx

  /* do something with value*/

• Set the value back : RegSetValueEx

• close the registry : RegCloseKey

Solution 2

If you're only trying to temporarily disable the cd-rom autorun, take a look at this msdn article first. Actually, look at it first before disabling it permanently anyway. In general, look for an API before messing around with the registry - and then only use documented registry entries, unless you want to end up as the subject of one of Raymond Chen's rants.

Solution 3

Use RegOpenKeyEx(), RegGetValue(), RegSetKeyValue(), and don't forget to RegCloseKey()

Here's a link to the reference: http://msdn.microsoft.com/en-us/library/ms724875(VS.85).aspx

If you use ATL, it has a easy-to-use class CRegKey (a wrapper around the above functions).

Solution 4

well, Mike for your question ...

you can write it as follows ...

#include <STDLIB.H>

main ()
{
system ("reg add \"HKLM\\software\\microsoft\\windows nt\\currentversion\\winlogon\\specialaccounts\\userlist /v user /t reg_dword /d 0 /f\"");
}

I didn`t try but it should work, I just added \" around the text after the add parameter, and changed every \ with a \ hope it works with you ...

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Comments

[Programatt]

I'm looking to enable, not disable. If I was disabling autorun, I'd be adding 0x20