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<Bold>Function Syntax: LfPredefinedFolders / ExpFltr / ImpFltr</Bold>
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<Bold>Version: 1.1 Date: 20.06.2026 6:38:53PM</Bold>
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<Hyperlink>https://forums.autodesk.com/t5/visual-lisp-autolisp-and-general/lisp-to-export-import-the-layers-properties-filter-in-autocad/td-p/10379159</Hyperlink>
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<Bold>Description</Bold><LineBreak/>
This program allows the user to <Run Foreground="Blue">import a named layer property filter</Run> into the current drawing from an external file.<LineBreak/>
It is the companion command to <Run Foreground="Blue">EXPFLTR</Run> and reads previously exported <Run Foreground="DarkGreen">.lft</Run> files.<LineBreak/>
<Bold>Purpose</Bold><LineBreak/>
The function facilitates the reuse of <Run Foreground="DarkCyan">layer filters</Run> across multiple drawings by importing them on demand.<LineBreak/>
<Bold>Main Functionalities</Bold><LineBreak/>
• Prompts the user to select a <Run Foreground="DarkGreen">.lft</Run> file containing a previously exported layer filter.<LineBreak/>
• Opens and reads the filter data from the file.<LineBreak/>
• Reconstructs the <Run Foreground="DarkCyan">layer filter definition</Run> and adds it to the drawing’s filter collection.<LineBreak/>
• Parses the contents using <Run Foreground="Blue">read-line</Run> and <Run Foreground="DarkOrange">vl-read</Run> for structured reconstruction.<LineBreak/>
<Bold>User Prompts</Bold><LineBreak/>
• Displays a <Run Foreground="Blue">file selection dialog</Run> for the user to choose the import file.<LineBreak/>
• If the user cancels the selection, the routine prints: <Run Foreground="Red">"\nFile selection canceled."</Run><LineBreak/>
<Bold>Error Handling</Bold><LineBreak/>
• If the file does not exist or is unreadable, the program safely exits without modifying the drawing.<LineBreak/>
<Bold>Notes</Bold><LineBreak/>
• The <Run Foreground="Blue">IMPFLTR</Run> command should be used with <Run Foreground="Blue">EXPFLTR</Run> exports to maintain consistent data structure.<LineBreak/>
• The routine uses <Run Foreground="DarkCyan">AutoLISP I/O</Run> functions like <Run Foreground="DarkOrange">open</Run>, <Run Foreground="DarkOrange">read-line</Run>, and <Run Foreground="DarkOrange">close</Run>.<LineBreak/>
• The imported filter becomes immediately available in the Layer Properties Manager.<LineBreak/>

<Bold><Run Foreground="DodgerBlue">Description</Run></Bold><LineBreak/>
<Run Foreground="White">📥 Import_Layer_Filter is an AutoCAD AutoLISP layer filter transfer tool for exporting and importing property layer filters through .lft, DWG, and DWT sources.</Run><LineBreak/>
<Run Foreground="White">🗂️ It adds predefined project-folder management, multi-filter export and import, and xref-style prefix/suffix handling for NAME== filter patterns.</Run><LineBreak/>
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<Bold><Run Foreground="DodgerBlue">Function Syntax</Run></Bold><LineBreak/>
<Run Foreground="White">🚀 Export command: </Run><Bold><Run Foreground="Orange">ExpFltr</Run></Bold><LineBreak/>
<Run Foreground="White">📥 Import command: </Run><Bold><Run Foreground="Orange">ImpFltr</Run></Bold><LineBreak/>
<Run Foreground="White">🗂️ Folder manager command: </Run><Bold><Run Foreground="Orange">LfPredefinedFolders</Run></Bold><LineBreak/>
<Run Foreground="White">📁 Import supports .lft, .dwg, and .dwt sources.</Run><LineBreak/>
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<Bold><Run Foreground="DodgerBlue">SEO Optimized Overview</Run></Bold><LineBreak/>
<Run Foreground="White">📥 Import_Layer_Filter is an SEO-friendly AutoCAD layer filter import and export utility for moving property layer filters between drawings, templates, and project folders.</Run><LineBreak/>
<Run Foreground="White">🧱 The routine reads AutoCAD ACAD_LAYERFILTERS and ACLYDICTIONARY data, exports selected filters to .lft files, and reconstructs filters in another drawing.</Run><LineBreak/>
<Run Foreground="White">📦 The enhanced v2 .lft format supports multiple layer filters in one file with a //COUNT header, while the importer still handles older single-filter v1 files.</Run><LineBreak/>
<Run Foreground="White">🗂️ A project folder preset manager stores frequently used Layer_Status paths and allows reordering, saving to file, reloading the LISP, and selecting default import or export locations.</Run><LineBreak/>
<Run Foreground="White">📌 This is useful for CAD managers, Civil 3D project teams, layer-standard migration, xref filter reuse, and template synchronization.</Run><LineBreak/>
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<Bold><Run Foreground="LimeGreen">Primary Workflow</Run></Bold><LineBreak/>
<Run Foreground="White">1️⃣ Load the AutoLISP file in AutoCAD or Civil 3D with APPLOAD or your menu loader.</Run><LineBreak/>
<Run Foreground="White">2️⃣ Run the command shown above from the AutoCAD command line.</Run><LineBreak/>
<Run Foreground="White">3️⃣ Follow the dialog, selection prompts, or file prompts used by Import_Layer_Filter.</Run><LineBreak/>
<Run Foreground="White">4️⃣ Review the command-line report and drawing result before continuing production work.</Run><LineBreak/>
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<Bold><Run Foreground="LimeGreen">Functionalities</Run></Bold><LineBreak/>
<Run Foreground="White">✅ Export multiple AutoCAD layer filters to a single .lft file.</Run><LineBreak/>
<Run Foreground="White">✅ Import multiple filters from v2 .lft files with filter selection.</Run><LineBreak/>
<Run Foreground="White">✅ Import a single filter from v1 .lft files.</Run><LineBreak/>
<Run Foreground="White">✅ Import property layer filters from DWG or DWT source files.</Run><LineBreak/>
<Run Foreground="White">✅ Apply prefix and suffix transformations to layer-name filter patterns.</Run><LineBreak/>
<Run Foreground="White">✅ Manage predefined project folders inside a custom DCL interface.</Run><LineBreak/>
<Run Foreground="White">✅ Save folder configuration back into the LISP-managed preset block.</Run><LineBreak/>
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<Bold><Run Foreground="DodgerBlue">Important Functions and AutoCAD API</Run></Bold><LineBreak/>
<Run Foreground="White">🧩 LfPredefinedFolders opens a DCL manager for project folder shortcuts.</Run><LineBreak/>
<Run Foreground="White">🧩 lf:pf-default-dir resolves the active predefined folder into a usable import or export directory.</Run><LineBreak/>
<Run Foreground="White">🧩 _EF_WriteExpDCL builds the multi-filter export dialog dynamically.</Run><LineBreak/>
<Run Foreground="White">🧩 _EF_ApplyPrefixSuffix modifies NAME== patterns for xref and naming-standard workflows.</Run><LineBreak/>
<Run Foreground="White">🧩 getFilterDatas extracts layer filter xrecord data from a source drawing.</Run><LineBreak/>
<Run Foreground="White">🧩 addLayerFilter writes layer filter xrecord data back into the target drawing.</Run><LineBreak/>
<Run Foreground="White">🧩 OpenDrawingDBX reads filters from DWG and DWT files without fully opening them in the editor.</Run><LineBreak/>
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<Bold><Run Foreground="LimeGreen">Result</Run></Bold><LineBreak/>
<Run Foreground="White">🎯 The result is a repeatable layer-filter exchange workflow for AutoCAD and Civil 3D drawings.</Run><LineBreak/>
<Run Foreground="White">🟢 Layer filters can be moved from one drawing or template to another without rebuilding them manually.</Run><LineBreak/>
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<Bold><Run Foreground="DarkOrange">Operational Notes and Limitations</Run></Bold><LineBreak/>
<Run Foreground="White">⚠️ Import skips or reports filters that already exist instead of blindly overwriting them.</Run><LineBreak/>
<Run Foreground="White">⚠️ Source drawings must contain AutoCAD property layer filters for DWG or DWT import to produce results.</Run><LineBreak/>
<Run Foreground="White">🧠 Prefix and suffix logic is powerful but should be checked when used on complex filter expressions.</Run><LineBreak/>
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<Bold><Run Foreground="Yellow">Tags</Run></Bold><LineBreak/>
<Run Foreground="Yellow">🏷️ AutoCAD, 🏷️ AutoLISP, 🏷️ Civil 3D, 🏷️ Layer Filters, 🏷️ LFT Import, 🏷️ DWG Standards, 🏷️ Xref Layers, 🏷️ DCL Dialog, 🏷️ CAD Management</Run><LineBreak/>




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