摘要：from:https://www.ghostscript.com/download/gsdnld.html https://www.codeproject.com/Articles/317700/Convert-a-PDF-into-a-series-of-images-using-Csharp h
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摘要：// A delegate type for hooking up change notifications. public delegate void ProgressChangingEventHandler(object sender, string e); /// <summary> ///
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