Create new data in registry key? - c++

Question

I just create new registry key called MyTestApp, and want to add new data in it, but don't know how. So I have following code.
bool CreateSectionDataRegistry(CString sectionData, CString sectionValue)
{
HKEY hKey; //registry key handle
LONG lResult; //result of registry operations
DWORD dwType, dwSize=0;
//try to open the key that we are currently pointing at with rootPath
lResult = RegOpenKeyEx(HKEY_LOCAL_MACHINE, rootPath + "\\" + "MyTestApp", NULL, KEY_ALL_ACCESS, &hKey);
if (lResult == ERROR_SUCCESS || lResult == ERROR_MORE_DATA)
{
//we have successfully opened the registry key. Now try to access the data
lResult = RegQueryValueEx(HKEY_LOCAL_MACHINE, sectionData, 0, &dwType, NULL, &dwSize);
if(lResult == ERROR_SUCCESS || lResult == ERROR_MORE_DATA)
{
//data already exists, so just return
RegCloseKey(hKey);
return true;
}
else//section data does not exist, so create new data
{
DWORD dwDisposition;
lResult = RegCreateKeyEx(HKEY_LOCAL_MACHINE, sectionData, 0, NULL, REG_OPTION_NON_VOLATILE, KEY_WRITE, NULL, &hKey, &dwDisposition);
RegCloseKey(hKey);
return true;
}
}
return false;
}
But when I trace down to the RegCreateKeyEx() call, it returns success but data is not created under the MyTestApp registry key or anywhere in the registry. Am I using the correct function to create new data under MyTestApp. Also from the argument above, I have CString sectionValue, so how do I check if I need to create data for REG_SZ or REG_DWORD?
Thanks!

Answer 1

It seems I just need to call RegSetValueEx() to create registry value under MyTestApp. Probably just me but when I look at the RegSetValueEx() definition in Microsoft website, it says set the value, but it does not say if value does not exist, it will create the value.
LPTSTR lpszData = new TCHAR[sectionValue.GetLength() + 1];
_tcscpy(lpszData, sectionValue);
lResult = RegSetValueEx(hKey, sectionData, 0, REG_SZ, (LPBYTE)lpszData, sectionValue.GetLength());
So now it creates the registry value, however I cannot still tell if sectionValue is REG_SZ or REG_DWORD.