目录引言将PowerPoint幻灯片转换为PNG图片将PowerPoint幻灯片转换为图片并指定图片大小将PowerPoint幻灯片转换为SVG图形文件引言
i\'ve got 3 Log classes that all implements iLog interface: DatabaseLog FileLog ScreenLog there can only be one instance of them. initially i though of using single pattern for each class but then
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