1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Text;
  5 using System.IO.Compression;
  6 using System.IO;
  7 using ESRI.ArcGIS.DataSourcesGDB;
  8 using ESRI.ArcGIS.esriSystem;
  9 using ESRI.ArcGIS.Geodatabase;
 10 using ESRI.ArcGIS.Geometry;
 11 namespace CompressMxd
 12 {
 13     class CompressMxdFile
 14     {
 15         public static IWorkspace OpenWorkspace(string mdbPath)
 16         {
 17             IWorkspaceFactory pwspfact=new AccessWorkspaceFactoryClass();
 18             IWorkspace pwsp = pwspfact.OpenFromFile(mdbPath, 0);
 19             return pwsp;
 20         }
 21         public static bool ReadAndCompressMxdFile(string fileName, IWorkspace pwsp)
 22         {
 23             byte[] buffer = null;
 24             try
 25             {
 26                 using (System.IO.FileStream sourceStream = new System.IO.FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read))
 27                 {
 28                     buffer = new byte[sourceStream.Length];
 29                     int checkCounter = sourceStream.Read(buffer, 0, buffer.Length);
 30                     byte[] compressBytes = Compress(buffer);
 31
 32                     MemoryBlobStream blob = new MemoryBlobStream();
 33                     ((IMemoryBlobStreamVariant)blob).ImportFromVariant(compressBytes as object);//将一个Byte[]对象作为参数传入
 34
 35                     IFeatureWorkspace pFwsp = pwsp as IFeatureWorkspace;
 36                     ITable ptable = pFwsp.OpenTable("MxdCollection");
 37                     IRow row = ptable.CreateRow();
 38                     var idx = row.Fields.FindField("MxdFile");
 39                       IField field = ptable.Fields.get_Field(idx);
 40                       if (field.CheckValue(blob))
 41                       {
 42                           row.set_Value(idx, blob as object);
 43                       }
 44                       row.Store();
 45                 }
 46             }
 47             catch (System.Exception ex)
 48             {
 49                 return false;
 50             }
 51
 52             return true;
 53         }
 54         public static bool DeCompressMxdFile(string fileName,IWorkspace pwsp)
 55         {
 56
 57             IFeatureWorkspace pFwsp = pwsp as IFeatureWorkspace;
 58             ITable ptable = pFwsp.OpenTable("MxdCollection");
 59             IRow row = ptable.GetRow(4);
 60             var idx = row.Fields.FindField("MxdFile");
 61             object objtest =  row.get_Value(idx);
 62
 63             IMemoryBlobStreamVariant pVar = objtest as IMemoryBlobStreamVariant;
 64             object pobj = new object();
 65             pVar.ExportToVariant(out pobj); //转入Object对象
 66             byte[] desbytes = Decompress((byte[])pobj);
 67             using (System.IO.FileStream destinationStream = new System.IO.FileStream(fileName, FileMode.Create))
 68             {
 69                 destinationStream.Write(desbytes,0,desbytes.Length);
 70             }
 71             return true;
 72         }
 73         private static byte[] Compress(byte[] bytes)
 74         {
 75             using (MemoryStream ms = new MemoryStream())
 76             {
 77                 GZipStream Compress = new GZipStream(ms, CompressionMode.Compress);
 78
 79                 Compress.Write(bytes, 0, bytes.Length);
 80
 81                 Compress.Close();
 82
 83                 return ms.ToArray();
 84
 85             }
 86         }
 87
 88         private static byte[] Decompress(Byte[] bytes)
 89         {
 90             using (MemoryStream tempMs = new MemoryStream())
 91             {
 92                 using (MemoryStream ms = new MemoryStream(bytes))
 93                 {
 94                     GZipStream Decompress = new GZipStream(ms, CompressionMode.Decompress);
 95
 96                     Decompress.CopyTo(tempMs);
 97
 98                     Decompress.Close();
 99
100                     return tempMs.ToArray();
101                 }
102             }
103         }
104     }
105 }