WINDOWS REGISTRY ???

HI,

In GetProfilestring(...) API, the first two parametrers are section name and key name can some body explain me about these two params??

Thanx

GetProfleString Will retrive from ini files unless specified. I am not sure how yuo specify with the api, but if you use the CWinApp::GetProfileString/WriteProfileString it will retrieve values from teh registry. You must call the SetRegistryKey() function to set the registry key under the default location which is
HKEY_CURRENT_USER\Software in the registry.
To use a subkey under that you can use m_pszProfileName member.
CString GetProfileString( LPCTSTR lpszSection, LPCTSTR lpszEntry, LPCTSTR lpszDefault = NULL ); is the function header.
the lpszSection is the name of the section
ex: if we have a key called HKEY_CURRENT_USER\Software\Liberty Tax Service\stuff, stuff is the subkey.
the next param is lpszEntry whcih is the name of the value you wish to retrieve.
and then the last param is a default return string. ask if you still have questons


Jim Hewitt, Liberty Tax Service

Hi,

Thanx for the answer.

I have a query.I am looking to get the path of realplay.exe which is in

HKEY_CLASSES_ROOT\\Software\\RealNetworks\\RealPlayer\\6.0\\Preferences

How do I use CWinApp::GetProfileString(...)??

Put this function in your InitInstance of you app
SetRegistryKey((_T(HKEY_CLASSES_ROOT\\Software\\RealNetworks\\RealPlayer\\6.0\\Preferences”));
then any calls you maek to get or write profile string should read from that protion of the registry.

Jim Hewitt, Liberty Tax Service

HI,
HKEY_CLASSES_ROOT\\Software\\RealNetworks\\RealPlayer\\6.0\\Preferences\\MainApp contains the data what I am trying to retrive.

I have SetRegKey("HKEY_CLASSES_ROOT\\Software\\RealNetworks\\RealPlayer\\6.0\\Preferences\\MainApp"); in the InitInstance of my application.

and I am trying to retrive by using,

GetProfileString("HKEY_CLASSES_ROOT\\Software\\RealNetworks\\RealPlayer\\6.0\\Preferences\\MainApp", "MainApp",NULL);

Is this correct? I am unable to get the data??

I don't know what leads into this kind of discussion. Actually SetRegistryKey Always sets the key Under HKEY_CURRENT_USERS\Software . So when you say SetRegistryKey( "XXXX\\YYYY") it created entry as HKEY_CURRENT_USERS\Software\XXXX\YYYY. So you wont get any value. USe the Following code to get the Value

HRESULT UtilityFunctions::GetRegistryKeyStrVal( HKEY hKey , LPTSTR wSubkey , LPTSTR wValname,
TCHAR* lpszValue)
{

HKEY subKey;

//Open the Registry Key
if(::RegOpenKeyEx(hKey, wSubkey, 0, KEY_QUERY_VALUE,
&subKey) != ERROR_SUCCESS)
{
lpszValue = NULL;
return E_FAIL;
}

DWORD type = REG_DWORD;
DWORD cbData = 0;

// Get the Length of the Reg. key Value For allocation
if(::RegQueryValueEx(subKey, wValname, NULL,
&type, NULL, &cbData) != ERROR_SUCCESS)
{
lpszValue = NULL;
return E_FAIL;
}
//Query for Registry Value
type = REG_SZ;
TCHAR *pBuf = new TCHAR[cbData + 1];
if(::RegQueryValueEx(subKey, wValname, NULL, &type,
(LPBYTE)pBuf, &cbData) != ERROR_SUCCESS)
{
lpszValue = NULL;
return E_FAIL;
}
// Assign to the Return String
_tcscpy( lpszValue , pBuf);
//Delete the Bugger & close the Key
delete[] pBuf;
::RegCloseKey(subKey);
//return Success;
return S_OK;
}

Thanx for the code.

Will u tell me what exactly I need to pass as "hKey","wSubkey","wValname" . I am confused with key and subkey concept!!!.

hKey is one of the Following Value
HKEY_LOCAL_MACHINE
HKEY_CURRENT_USERS
HKEY_CLASSES_ROOT etc

i your case it is HKEY_CLASSES_ROOT

wSubKey in your case is
"Software\\RealNetworks\\RealPlayer\\6.0\\Preferences\\MainApp"
wValName is NULL ( bcoz your going to retrive Default value )

Use these value and if you have any problem contact me at [email protected]