CAD从二制流数据中加载图形（com接口Delphi语言）

主要用到函数说明：

_DMxDrawX::ReadBinStream

从二制流数据中加载图形，详细说明如下：

参数	说明
VARIANT varBinArray	二制流数据，是个byte数组
BSTR sPassword	图纸密码.没有密码，传空字符串
LONG lReadContent	加载内容，如果全部加载，传16777215,十六进制0xFFFFFF

Delphi代码实现如下：

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function OleToMStream(OV:OleVariant): TMemoryStream;             var               Data: PByteArray;               Size: integer;             beginResult:=TMemoryStream.Create;                     try                        Size:=VarArrayHighBound(OV,1)-VarArrayLowBound(OV,1)+1;                        Data:=VarArrayLock(OV);                         try                            Result.Position:=0;                            Result.WriteBuffer(Data^,Size);                          finally                            VarArrayUnlock(OV);                          end;                      except                        Result.Free;Result:=nil;                      end;                    end;                       function MStreamToOle(Strm:TMemoryStream): OleVariant;                    var                      Data: PByteArray;                    beginResult:= VarArrayCreate([0,   Strm.Size   -   1],   varByte);                      Data:=   VarArrayLock(Result);                     try                          Strm.Position   :=   0;                          Strm.ReadBuffer(Data^,   Strm.Size);                      finally                          VarArrayUnlock(Result);                      end;                    end;                       procedure TForm2.Button6Click(Sender: TObject);                    var                      aryData:OleVariant;                      memStream : TMemoryStream ;                      aryReadData:     OleVariant;                    begin                        // 写到内存流                       MxDrawX1.WriteBinStream(aryData,'',23);                       memStream := OleToMStream(aryData);                        // 从内存流加载                       aryReadData := MStreamToOle( memStream);                       MxDrawX1.ReadBinStream(aryData,'',23);                       end;