c++ 读写注册表

void RegUpdate(HKEY hRootKey,LPCSTR szSubKey,LPCSTR szValueName,LPCSTR szValue)

{

   HKEY hKey;

   LONG rc;

   int nFile;

   rc = RegCreateKeyEx(hRootKey, szSubKey, NULL, NULL, , KEY_WRITE, NULL, &hKey, NULL);

   if(rc != ERROR_SUCCESS)

      return;

   nFile = strlen(szValue);

   RegSetValueEx(hKey, szValueName, NULL, REG_SZ, (LPBYTE)szValue, nFile);

   RegCloseKey(hKey);

}

string RegGet(HKEY hRootKey,LPCSTR szSubKey,LPCSTR szValueName)

{

    HKEY hKey;

    LONG rc;

    DWORD dwType;

    char szValue[];

    DWORD dwSize;

    rc = RegOpenKey(hRootKey, szSubKey, &hKey);

    if(rc != ERROR_SUCCESS)

        return FALSE;

    rc = RegQueryValueEx(hKey, szValueName, NULL, &dwType, (LPBYTE)szValue, &dwSize);

    if(rc == ERROR_SUCCESS && dwType == REG_SZ)

    {

        RegCloseKey(hKey);

        return (string)szValue;

    }

    RegCloseKey(hKey);

    return NULL;

}