Class Libraries & REST APIs for the developers to manipulate & process Files from Word, Excel, PowerPoint, Visio, PDF, CAD & several other categories in Web, Desktop or Mobile apps. Develop & deploy on Windows, Linux, MacOS & Android platforms.... Open ( presentationFile , false ))...ppt = PresentationDocument . Open ( docName , false )) { // 获取第一张幻灯片的关系...