AutoCAD.Net/C#.Net QQ群:193522571 previewicon生成的块图标太小，CMLContentSearchPreviews生成大的图片

由于CMLContentSearchPreviews方法是AutoCAD2014中才加入的，所以只能应用于2014及以后版本，可惜啊！

using System.IO;

using Autodesk.AutoCAD.ApplicationServices;

using Autodesk.AutoCAD.DatabaseServices;

using Autodesk.AutoCAD.EditorInput;

using Autodesk.AutoCAD.Runtime;

using Autodesk.AutoCAD.Windows.Data;

namespace BlockPreviews

{

    public class Commands

    {

        [CommandMethod("GBP", CommandFlags.Session)]

        public static void GenerateBlockPreviews()

        {

            var ed = Application.DocumentManager.MdiActiveDocument.Editor;

            var res = ed.GetFileNameForOpen("Select file for which to generate previews");

            if (res.Status != PromptStatus.OK)

                return;

            string dwgname = res.StringResult;

            Document doc = null;

            try

            {

                doc = Application.DocumentManager.Open(dwgname, false);

            }

            catch

            {

                ed.WriteMessage("\nUnable to read drawing.");

                return;

            }

            var db = doc.Database;

            string path = Path.GetDirectoryName(dwgname),

                   name = Path.GetFileName(dwgname),

                   iconPath = path + "\\" + name + " icons";

            int numIcons = 0;

            using (var tr = doc.TransactionManager.StartTransaction())

            {

                var bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);

foreach (ObjectId btrId in bt)

                {

                    var btr = (BlockTableRecord)tr.GetObject(btrId, OpenMode.ForRead);

                    // Ignore layouts and anonymous blocks

                    if (btr.IsLayout || btr.IsAnonymous)

                        continue;

                    // Attempt to generate an icon, where one doesn‘t exist

                    if (btr.PreviewIcon == null)

                    {

                        object ActiveDocument = doc.GetAcadDocument();

                        object[] data = { "_.BLOCKICON " + btr.Name + "\n" };

                        ActiveDocument.GetType().InvokeMember(

                          "SendCommand",

                          System.Reflection.BindingFlags.InvokeMethod,

                          null, ActiveDocument, data

                        );

                    }
// Hopefully we now have an icon
if (btr.PreviewIcon != null)

                    {

                        // Create the output directory, if it isn‘t yet there
if (!Directory.Exists(iconPath))

                            Directory.CreateDirectory(iconPath);
var fname = iconPath + "\\" + btr.Name + ".bmp";
// Delete the image if it already exists
if (File.Exists(fname))

                            File.Delete(fname);
// Save the icon to our out directory
btr.PreviewIcon.Save(fname);
// Increment our icon counter
numIcons++;

                    }

                }

                tr.Commit();

            }

            doc.CloseAndDiscard();
ed.WriteMessage("\n{0} block icons saved to \"{1}\".", numIcons, iconPath);

        }
[CommandMethod("GBP2")]

        public static void GenerateBlockPreviews2()

        {

            Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
PromptFileNameResult res = ed.GetFileNameForOpen("Select file for which to generate previews");

            if (res.Status != PromptStatus.OK)

                return;
string dwgname = res.StringResult;

            int numIcons;

            string iconPath;
// We don‘t need a document for access to the BlockTable
using (var db = new Database(false, true))

            {

                try

                {

                    db.ReadDwgFile(

                      dwgname,

                      FileOpenMode.OpenForReadAndReadShare,

                      true,

                      ""

                    );

                }

                catch

                {

                    ed.WriteMessage("\nUnable to read drawing.");

                    return;

                }
var path = Path.GetDirectoryName(dwgname);

                var name = Path.GetFileName(dwgname);

                iconPath = path + "\\" + name + " icons";
using (var tr = db.TransactionManager.StartTransaction())

                {

                    var bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);

                    numIcons = ExtractThumbnails(iconPath, tr, bt);

                    tr.Commit();

                }

            }
ed.WriteMessage("\n{0} block icons saved to \"{1}\".", numIcons, iconPath);

        }
[CommandMethod("GBPC")]

        public static void GenerateCurrentBlockPreviews()

        {

            var doc = Application.DocumentManager.MdiActiveDocument;

            var ed = doc.Editor;

            var db = doc.Database;
var path = (string)Application.GetSystemVariable("DWGPREFIX");

            var name = (string)Application.GetSystemVariable("DWGNAME");

            var iconPath = path + name + " icons";
using (var tr = doc.TransactionManager.StartTransaction())

            {

                var bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);

                int numIcons = ExtractThumbnails(iconPath, tr, bt);

                tr.Commit();

                ed.WriteMessage("\n{0} block icons saved to \"{1}\".", numIcons, iconPath);

            }

        }
private static int ExtractThumbnails(string iconPath, Transaction tr, BlockTable bt)

        {

            int numIcons = 0;

            foreach (ObjectId btrId in bt)

            {

                var btr = (BlockTableRecord)tr.GetObject(btrId, OpenMode.ForRead);
// Ignore layouts and anonymous blocks

                if (btr.IsLayout || btr.IsAnonymous)

                    continue;

                // Attempt to generate an icon, where one doesn‘t exist

                {

                    // Create the output directory, if it isn‘t yet there

                    if (!Directory.Exists(iconPath))

                        Directory.CreateDirectory(iconPath);

                    // Save the icon to our out directory

                    var imgsrc = CMLContentSearchPreviews.GetBlockTRThumbnail(btr);

                    var bmp = ImageSourceToGDI(imgsrc as System.Windows.Media.Imaging.BitmapSource);

                    var fname = iconPath + "\\" + btr.Name + ".bmp";

                    if (File.Exists(fname))

                        File.Delete(fname);

                    bmp.Save(fname);

                    // Increment our icon counter

                    numIcons++;

                }

            }

            return numIcons;

        }
// Helper function to generate an Image from a BitmapSource
private static System.Drawing.Image ImageSourceToGDI(System.Windows.Media.Imaging.BitmapSource src

        )

        {

            var ms = new MemoryStream();

            var encoder = new System.Windows.Media.Imaging.BmpBitmapEncoder();

            encoder.Frames.Add(System.Windows.Media.Imaging.BitmapFrame.Create(src));

            encoder.Save(ms);

            ms.Flush();

            return System.Drawing.Image.FromStream(ms);

        }

    }

}

AutoCAD.Net/C#.Net QQ群:193522571
previewicon生成的块图标太小，CMLContentSearchPreviews生成大的图片,布布扣,bubuko.com

AutoCAD.Net/C#.Net QQ群:193522571
previewicon生成的块图标太小，CMLContentSearchPreviews生成大的图片