C++简单代码设置U盘的可写性

如题，主要用于本机限制U盘访问，代码如下：

/*
@prarm dwValue,0为可写，1为不可写
*/
BOOL SetUsbWriteProtect(DWORD dwValue)
{
    HKEY hKey;;
    DWORD dwRet = RegCreateKey(HKEY_LOCAL_MACHINE,"SYSTEM\\CurrentControlSet\\Control\\StorageDevicePolicies",&hKey);
    if (dwRet != ERROR_SUCCESS)
        return FALSE;
    DWORD dwSize = sizeof(dwValue);
    dwRet = RegSetValueEx(hKey,"WriteProtect",0,REG_DWORD,(BYTE*)&dwValue,dwSize);
    RegCloseKey(hKey);
    if (dwRet == ERROR_SUCCESS)
        return TRUE;
    return FALSE;
}