這是本文件的舊版！

How to detect previous version in InstallAnywhere?

Problem

軟體升級是維護產品必經之路。透過安裝程式升級，幾乎是大家都會使用的方式。

How to?

CustomCodeRule - HasPreviousVersionRule

package org.tonylin.practice.ia.customcode;
 
import com.zerog.ia.api.pub.CustomCodeRule;
 
public class HasPreviousVersionRule extends CustomCodeRule {
	@Override
	public boolean evaluateRule() {
		String base_version = (String)ruleProxy.getVariable("BASE_PRODUCT_VERSION");
		if( base_version == null || base_version.isEmpty() ) {
			return false;
		}
 
		String installer_version = (String)ruleProxy.getVariable("PRODUCT_VERSION_NUMBER");
 
		return installer_version.compareTo(base_version) >= 1;
	}
}

Reference