Problems Querying a registry value

[Luis E Cuadrado]

Hello Everybody ok, here is my code: HKEY keyHandle; char *rgValue = NULL; PLONG buffLen = NULL; if(RegOpenKey( HKEY_LOCAL_MACHINE, "Software\\Microsoft\\Windows\\CurrentVersion", &keyHandle) == ERROR_SUCCESS) { //MessageBox(_T("Key was opened")); RegQueryValue(keyHandle, "MediaPath", rgValue, buffLen ); MessageBox(rgValue); } What I want to do is to query the registry value of MediaPath and store it in the rgValue variable. I looked at it in MSDN and I did exactly that it says. I tryed a couple of times and nothing is being saved in rgValue. Have you guys had this problem before. What should I do? Am I missing something? Any anwer is more than welcome. Have a good day, Luis E. Cuadrado :0)

[Tomasz Sowinski]

You need to initialize buffLen with an address of variable containing max size of buffer before calling RegQueryValue. Tomasz Sowinski -- http://www.shooltz.com

Free your mind and your ass will follow.

[Luis E Cuadrado]

Hi Tomasz: Thank you for your quick reply. This is what I did to my code after reading your reply: HKEY keyHandle; char rgValue**[MAX_PATH];** DWORD buffLen = MAX_PATH; if(RegOpenKey( HKEY_LOCAL_MACHINE, "Software\\Microsoft\\Windows\\CurrentVersion", &keyHandle) == ERROR_SUCCESS) { //MessageBox(_T("Key was opened")); RegQueryValue(keyHandle, "MediaPath", rgValue, (PLONG) buffLen ); MessageBox(rgValue); } Is that what you meant by initializing buffLen? I'm new in MFC specially reading registry stuff, so I apologize for my ignorance. Luis E. Cuadrado :0)

[Tomasz Sowinski]

It should work. BTW: 'registry stuff' you're using now isn't MFC, its plain Win32 API. Tomasz Sowinski -- http://www.shooltz.com

Free your mind and your ass will follow.

[Le centriste]

Yes, that is what he meant, except for:

LONG buffLen = MAX_PATH;
RegQueryValue(keyHandle, "MediaPath", rgValue, &buffLen );

Btw, you should use RegQueryValueEx. Michel It is a lovely language, but it takes a very long time to say anything in it, because we do not say anything in it, unless it is worth taking a very long time to say, and to listen to.
- TreeBeard

[Luis E Cuadrado]

Hello: Well, I started to look to RegOpenKeyEx and RegQueryValueEx in MSDN. I used those in my code and it works. The help that you guys provided to me worked with these too. I want to thank you guys (Thomasz and Michel) for your help. I really appreciate it. Take care, Luis E. Cuadrado :0)