Parallel DWG Reads

Anonymous — Fri, 24 Jul 2020 13:24:06 GMT

Hi.

My application (a .DLL which I netload in) accesses several DWGs selected in a windows form app and collects some block attribute info about them. How can I do this in parallel?

I don't need to save the DWG at all during processing.

DWG.cs:

public class DWG { public string DWGLocation; public string DWGName; public string DWGRev; public List<string> DWGLayouts; public string PDFName; public bool PDFExists; public bool IsDWGLocked; public bool IsPlotPDFLocked; public bool IsHistoricalPDFLocked; public bool IsReviewPDFLocked; // Class constructor based on passed parameter public DWG(string dwgToProcess) { DWGLocation = dwgToProcess; DWGName = Path.GetFileName(DWGLocation); PDFExists = File.Exists(FileOps.Path(DWGLocation) + GlobalVals.plotDir + PDFName); IsDWGLocked = FileOps.IsFileLocked(DWGLocation); IsPlotPDFLocked = FileOps.IsFileLocked(FileOps.Path(dwgToProcess) + GlobalVals.plotDir + PDFName); IsHistoricalPDFLocked = FileOps.IsFileLocked(FileOps.Path(dwgToProcess) + GlobalVals.historicalDir + PDFName); IsReviewPDFLocked = FileOps.IsFileLocked(FileOps.Path(dwgToProcess) + GlobalVals.reviewDir + PDFName); // Get the rev num and layout names from the DWG try { DWGRev = "?"; List<string> layouts = new List<string>(); using (Database db = new Database(false, true)) { db.ReadDwgFile(dwgToProcess, FileShare.Read, false, null); db.CloseInput(true); using (Transaction tr = db.TransactionManager.StartTransaction()) { // Layouts DBDictionary layoutDict = (DBDictionary)db.LayoutDictionaryId.GetObject(OpenMode.ForRead); foreach (DBDictionaryEntry entry in layoutDict) { if (entry.Key != "Model") { ObjectId layoutId = entry.Value; Layout layout = tr.GetObject(layoutId, OpenMode.ForRead) as Layout; layouts.Add(layout.LayoutName); } } DWGLayouts = layouts; // Attribute var bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead); if (bt.Has(GlobalVals.titleblock)) { // Open the block definition var btr = (BlockTableRecord)tr.GetObject(bt[GlobalVals.titleblock], OpenMode.ForRead); // Get the inserted block references ObjectIds var ids = btr.GetBlockReferenceIds(true, true); if (ids.Count > 0) { // Open the first block reference var br = (BlockReference)tr.GetObject(ids[0], OpenMode.ForRead); // Iterate through the attribute collection foreach (ObjectId id in br.AttributeCollection) { // Open the attribute reference var attRef = (AttributeReference)tr.GetObject(id, OpenMode.ForRead); // If the attribute tag is what we are searching for if (attRef.Tag.Equals(GlobalVals.revtag, StringComparison.CurrentCultureIgnoreCase)) { DWGRev = attRef.TextString == "" || attRef.TextString == " " ? "R0" : attRef.TextString; break; } } } } tr.Commit(); } } // Remove any spaces in the front or end of the REV val with trim in case of bad input DWGRev.Trim(); PDFName = PDFOps.GetPDFName(DWGLocation, DWGRev); } catch (System.Exception ex) { ErrorHandler.ErrorReport(ex, "GetRevNum", "notify"); } } }

I create multiple instances of DWG like so:

foreach (string dwg in dialog.FileNames) { // Check if the DWG already exists in list view to prevent duplicates in list view and list if (this.DwgList.FindItemWithText(dwg) == null) { // Create an instance of a DWG var dwgEntry = new DWG(dwg); // Make sure DWG is not locked if (!dwgEntry.IsDWGLocked) { // Make sure no PDFs are locked if (!dwgEntry.IsPlotPDFLocked && !dwgEntry.IsHistoricalPDFLocked && !dwgEntry.IsReviewPDFLocked) { // Add the item to the List & list view GlobalVals.dwgs.Add(dwgEntry); AddListViewItem(dwgEntry); } else { // Some or all of the PDFs are locked foreach (string error in FileOps.WhichPDFsAreLocked(dwgEntry)) { errors.Add(error); } } } else if (dwgEntry.IsDWGLocked) { errors.Add("The drawing " + dwgEntry.DWGName + " is currently open by a user."); } } else { errors.Add("The drawing " + Path.GetFileName(dwg) + " is already in the list."); } }

I tried doing it in parallel here, which crashed my AutoCAD:

Parallel.ForEach(dialog.FileNames, (dwg) = > { // Same body code as above }

Later in my code, I create a consolidated DSD file from the information in DWG object and send it to the publisher.

Re: Parallel DWG Reads

micle.space — Mon, 27 Jul 2020 13:15:23 GMT

just a quick result for a quick research on this forum:

https://forums.autodesk.com/t5/net/parallel-read-from-net/m-p/6397148

some quoted text: "...There is no parallel processing in AutoCAD. For better performance I would first suggest... "

https://forums.autodesk.com/t5/net/parallel-loop/m-p/3726470

again some quoted text: "...Sorry for the bad news, but the AutoCAD API isn't thread safe. You can.... "

topic Parallel DWG Reads in .NET Forum

Parallel DWG Reads

Re: Parallel DWG Reads