RegOpenKeyEx returning strange error

vipin_nvk

I have been trying to open particular registry key to know the version of Outlook currently installed on the PC. Here is the piece of code HKEY hKey; CString strKey = _T("Outlook.Application\\CurVer"); if (::RegOpenKeyEx(HKEY_CLASSES_ROOT, strKey, 0, KEY_READ, &hKey) == ERROR_SUCCESS) { // do something } else { DWORD dwError = GetLastError(); } The above piece of code fails to open the registry key and the GetLastError() returns error no. 122 which says "The data area passed to the system call is too small" I have administrative privilege on the PC, but this piece of code fails to open the key, what could be the reason, and how do I interpret the error returned? Thanx.

Jhony george

vipin_nvk wrote:

if (::RegOpenKeyEx(HKEY_CLASSES_ROOT, strKey, 0, KEY_READ, &hKey) == ERROR_SUCCESS)

Change the parameter value instead of "KEY_READ" give "KEY_ALL_ACCESS"... I'm not sure,whther this will work ..but try...

Born to win...!

vipin_nvk

This piece of code works fine at my place but fails with the above mentioned error at the client's place, so I wanted to know as to what could lead to the ERROR_INSUFFICIENT_BUFFER error so that it can be fixed and then sent across to the client. Do you think changing access to KEY_ALL_ACCESS will really work?

Jhony george

vipin_nvk wrote:

Do you think changing access to KEY_ALL_ACCESS will really work?

No, the changing key access ...it wont solve ur problem.. It's something related to other problem... :(

Born to win...!

Rajesh R Subramanian

Manivannan@congruent wrote:

Change the parameter value instead of "KEY_READ" give "KEY_ALL_ACCESS"...

As a matter of fact, that is a very bad suggestion. You should open a registry key only with the privileges that you may actually need.

Nobody can give you wiser advice than yourself. - Cicero .·´¯`·->Rajesh<-·´¯`·. Codeproject.com: Visual C++ MVP

David Crow

Have you tried:

HKEY hKey;

LONG lResult = ::RegOpenKeyEx(HKEY_CLASSES_ROOT, _T("Outlook.Application\\CurVer"), 0, KEY_READ, &hKey);
if (lResult == ERROR_SUCCESS)
{
// do something
}
else
{
LPVOID lpMsgBuf;

FormatMessage(FORMAT\_MESSAGE\_ALLOCATE\_BUFFER | FORMAT\_MESSAGE\_FROM\_SYSTEM,
              NULL,
              lResult,
              MAKELANGID(LANG\_NEUTRAL, SUBLANG\_DEFAULT),
              (LPTSTR) &lpMsgBuf,
              0,
              NULL);
...
LocalFree(lpMsgBuf);

}

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