a prob with HKEY

[Krauze]

BOOL checkExistence(HKEY *hKey, LPCTSTR lpszAppName)
{
CRegKey regKey;

if( regKey.Open(HKEY\_LOCAL\_MACHINE, \_T("SOFTWARE\\\\Microsoft\\\\Windows\\\\CurrentVersion\\\\Uninstall"),
				KEY\_READ) != ERROR\_SUCCESS )
	return FALSE;

DWORD dwIndex = 0;
DWORD cbName  = 128;
TCHAR szSubkeyName\[128\];

CString strSubkeyName;

int nHasAllItems = 0;

while( regKey.EnumKey(dwIndex, szSubkeyName, &cbName) != ERROR\_NO\_MORE\_ITEMS )
{
	dwIndex++;
	cbName = 128;

	// TCHAR->CString
	strSubkeyName.Format(\_T("%s"), szSubkeyName);
	if( strSubkeyName.Compare(lpszAppName) )
	{
		nHasAllItems++;
		continue;
	}
	else
		break;
}

regKey.Close();

if( nHasAllItems == dwIndex )
	return FALSE;
else
{
	\*hKey = regKey.m\_hKey;// this causes debug assertion failure:m\_hKey!=0
	return TRUE;
}

}

I wrote this funx to check whether there's a particular installed app in the registry. After calling this funx, hKey is expected to be assigned the registry handle. But prob occurs as Ive indicated above.

[David Crow]

How are you calling checkExistence()?

Krauze wrote:

strSubkeyName.Format(_T("%s"), szSubkeyName);

What's wrong with: strSubkeyName = szSubkeyName;

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"Man who follows car will be exhausted." - Confucius

[Krauze]

I mean:

*hKey = regKey.m_hKey;

Prob occurs here.

[Cool_Dev]

"hKey is expected to be assigned the registry handle." but how as you did regKey.Close(); before *hKey = regKey.m_hKey; ?? Try

*hKey = regKey.Detach();

Remeber to call RegCloseKey() on the obtained handle once finished using it.

modified on Wednesday, July 28, 2010 1:30 AM

[David Crow]

How are you calling checkExistence()? Aso, have you considered something a little more manageable, like:

BOOL checkExistence( HKEY *hKey, LPCTSTR lpszAppName )
{
CString strKey;
strKey.Format(_T("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\%s"), lpszAppName);

return RegOpenKey(HKEY\_LOCAL\_MACHINE, strKey, hKey) == ERROR\_SUCCESS;

}

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"Man who follows car will be exhausted." - Confucius

[KarstenK]

regKey.Close(); *hKey = regKey.m_hKey; after closing the key the handle is invalid. You really shouldnt do that :doh: Press F1 for help or google it. Greetings from Germany

[Krauze]

In fact Ive tried this method later. And it works perfectly.