使用流时，ImageMagick仅转换pdf的第一页

Question

问题

当我使用ImageMagick通过将整个文件读入内存来转换pdf时，它将PDF转换为6页图像（根据需要）。当我使用流接口尝试相同操作时，它只会转换第一页，而不会转换其他任何页面。如何获取此代码的流版本以转换整个pdf？

代码

org.hibernate.exception.SQLGrammarException: JDBC exception executing SQL [select c1_0.constructor_id, c1_0.is_active, m1_0.model_id, c3_0.constructor_id, c3_0.is_active, m3_0.model_id, m3_0.constructor_id, m3_0.count_business_slots, m3_0.count_eco_slots, m3_0.is_active, m3_0.name, c3_0.name, m1_0.count_business_slots, m1_0.count_eco_slots, m1_0.is_active, m1_0.name, m1_0.constructor_id, c1_0.name from constructor as c1_0 left outer join (model as m1_0) on c1_0.constructor_id=m1_0.constructor_id left outer join (constructor as c2_0) on m1_0.constructor_id=c2_0.constructor_id inner join (constructor as c3_0) on m1_0.constructor_id=c3_0.constructor_id left outer join (model as m3_0) on c3_0.constructor_id=m3_0.constructor_id where c1_0.is_active=?]

环境

使用GhostScript 9.26和ImageMagick 7.0.8-49

我看不到任何错误输出，但是我相对不熟悉流。