How to check that the given path exists in registry? - winapi

Question

Actually i have Path=Software\\Wow6432Node\\Microsoft\\Windows\\CurrentVersion\\Run,andSoftware\\Microsoft\\Windows\\CurrentVersion\\Run and i am passing root key asHKEY_USESRSfrom which i am getting subkeys.then Iam Concatinating subkey+Path.....In loop i am gettingHKEY_USERS\S-1-5-19\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Run also actually which is not existing in registry...is there any function to check Complete path exists or not?
listData.RemoveAll();
HKEY hrKey=HKEY_USERS,hKey;
if(hrKey==HKEY_USERS)
{
TCHAR achKey[MAX_KEY_LENGTH]; // buffer for subkey name
DWORD cbName; // size of name string
TCHAR achClass[MAX_PATH] = TEXT(""); // buffer for class name
DWORD cchClassName = MAX_PATH; // size of class string
DWORD cSubKeys=0; // number of subkeys
DWORD cbMaxSubKey; // longest subkey size
DWORD cchMaxClass; // longest class string
DWORD cValues; // number of values for key
DWORD cchMaxValue; // longest value name
DWORD cbMaxValueData; // longest value data
DWORD cbSecurityDescriptor; // size of security descriptor
FILETIME ftLastWriteTime; // last write time
DWORD i, retCode;
// Get the class name and the value count.
retCode = RegQueryInfoKey(hrKey, // key handle
achClass, // buffer for class name
&cchClassName, // size of class string
NULL, // reserved
&cSubKeys, // number of subkeys
&cbMaxSubKey, // longest subkey size
&cchMaxClass, // longest class string
&cValues, // number of values for this key
&cchMaxValue, // longest value name
&cbMaxValueData, // longest value data
&cbSecurityDescriptor, // security descriptor
&ftLastWriteTime); // last write time
if (cSubKeys)
{
for (i=0; i<cSubKeys; i++)
{
cbName = MAX_KEY_LENGTH;
retCode = RegEnumKeyEx(hrKey, i,achKey,&cbName,NULL,NULL,NULL,&ftLastWriteTime);
if (retCode == ERROR_SUCCESS)
{
CString subKey=achKey;
if(subKey!=_T(".DEFAULT")&&(subKey.Mid(subKey.ReverseFind('_')+1)!=_T("Classes")))
{
csRegistryPath=subKey+_T("\\")+csRegistryPath;
CLog::Log( csRegistryPath);
}
}
}
}
csRegistryPath is array in calling function then once i will getS-1-5-19\Software\Microsoft\Windows\CurrentVersion\Run and S-1-5-19\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce basing on this path i am performing further operations but actually HKEY_USERS\S-1-5-19\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\RunOnce not exist in registry if get this path i need to check if this is existing or not ? to do this isthere any API

Answer 1

For a Win32 API solution you use RegOpenKeyEx to test for existence of a key.
Do note that you must not hard code Wow6432Node. Use the KEY_WOW64_32KEY flag to specify that you want to look in the 32 bit view of the registry.
You would want to pass
STANDARD_RIGHTS_READ | KEY_WOW64_32KEY
to the samDesired argument of RegOpenKeyEx.