If Statement On Registry Key

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C++

Windows

Win7

IE9

I'm running this code to change registry key. However; I want to add an if statement to it that query the key before the change is made. Let's say I want to change the key to "0", I would query the key and if it was "0" then the code would stop, If it's a "3" then it would continue. How can this be done with this working code that I have? Thank you.

#define BUFFER_SIZE 1024 //add this to your header		
HKEY hKey;			
DWORD dwErr = NO_ERROR;
 
dwErr = RegOpenKeyEx (HKEY_CURRENT_USER,L"Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings\\Zones\\3",NULL,KEY_SET_VALUE|KEY_QUERY_VALUE,&hKey);
if(ERROR_SUCCESS == dwErr)
{
	BYTE data[BUFFER_SIZE] = {0};
	DWORD dwType = REG_NONE;
 
	dwErr = RegQueryValueEx(hKey,L"1803",NULL,&dwType,data,&buffersize);
	if(ERROR_SUCCESS == dwErr && REG_DWORD == dwType)
	//If Key "1803" Value = 0 then
	//Stop
	//Else
	{
		*((LPDWORD)data) = 0;
		dwErr = RegSetValueExW(hKey,L"1803",0,REG_DWORD,data,sizeof(DWORD));
	}
	RegCloseKey (hKey);
}