Hi,
Firstly, you should use the Forum for Protection Engine at the following link:
http://www.symantec.com/connect/security/forums/protection-engine-cloud-services-formerly-scan-engine
I'm not sure what do you mean by "not save the result file".
Do you mean say that you just want scan result returned from SPE?
In that case, you configure your ScanPolicy to "Scan Only" from Web console or configuration.xml setting of <ScanPolicy> tag value to "0".
Hope this helps,
Haro