70002416 Save Open to from stream and data buffer

Summary

Save Open to from stream and data buffer

Solution

In version 1005.0.1 following methods was added to vdDocument object

System.IO.MemoryStream SaveToMemoryStream(string fileTypeExtension)
Exports the document to a memory stream using the file format defined by the passed fileTypeExtension.
"fileTypeExtension": It can be one of the following strings ".vdml",".vdcl",".vds",".vdf",".dxf",".dwg",".dgn",".pdf"
returns: A System.IO.MemoryStream object if success else null


bool LoadFromStream(System.IO.Stream stream, string fileTypeExtension)
Load the drawing from the passed stream
"stream": A System.IO.MemoryStream object
"fileTypeExtension": The type of the data that the passed stream is created. It can be one of the following strings ".vdml",".vdcl",".vds",".vdf",".dxf",".dwg",".dgn",".pdf"


byte[] SaveToDataBuffer(string fileTypeExtension)
Exports the document to a byte array using the file format defined by the passed fileTypeExtension.
"fileTypeExtension": It can be one of the following strings ".vdml",".vdcl",".vds",".vdf",".dxf",".dwg",".dgn",".pdf"
returns: An array of bytes if success else null


bool LoadFromDataBuffer(ref byte []bytes, int offset, int count, string fileTypeExtension)
Load the drawing from the passed bytes array data
"bytes": An array of bytes contains the contents of a drawing file
"offset": The offset of the first byte to read from buffer which is the start of the file buffer.
"count": The number of bytes to read from buffer which is the end of the file buffer.
"fileTypeExtension": The type of file that the data is created. It can be one of the following strings ".vdml",".vdcl",".vds",".vdf",".dxf",".dwg",".dgn",".pdf"

Managed C# Code Sample:

            doc.Open(@"C:\someFolder\someFile.vdml");
            System.IO.MemoryStream MS = doc.SaveToMemoryStream(".dxf");
            doc.New();
            doc.LoadFromStream(MS, ".dxf");
            doc.Redraw(true);

            doc.Open(@"C:\someFolder\someFile.vdml");
            Byte[] arBytes = doc.SaveToDataBuffer(".dxf");
            doc.New();
            doc.LoadFromDataBuffer(ref arBytes, 0, arBytes.Length, ".dxf");
            doc.Redraw(true);

Only the SaveToDataBuffer and LoadFromDataBuffer are exported to the VDF Wrapper so these two methods can be used in VB6 and Delphi and similar ActiveX-enabled IDEs
 
Code Examples:

In Delphi it can be used like:

uses
  .....,
 VectorDraw_Professional_tlb,vdrawi5_tlb,vdrawlib5_tlb, Activex ;
......
var
  Form1: TForm1;
   doc : VectorDraw_Professional_tlb.vdDocument;
   arrfile: Activex.PSafeArray;

procedure TForm1.Button1Click(Sender: TObject);
var
   viHigh, i: integer;
begin  // press 1st
   vdraw1.ActiveDocument.New();
   vdraw1.CommandAction.cmdCircle(vararrayof([1,1,0]),1);
   vdraw1.DisplayFrames:=63;
   doc:=vdraw1.ActiveDocument.WrapperObject as   VectorDraw_Professional_tlb.vdDocument;
   arrfile:= doc.SaveToDataBuffer('.dxf');
   vdraw1.ActiveDocument.New();
   vdraw1.CommandAction.Zoom('e',0,0);
   SafeArrayGetUBound(arrfile,1,vihigh)  ;
   doc.LoadFromDataBuffer(arrfile,0,vihigh,'.dxf');
   doc.redraw(true);
end;

     VDraw1.ActiveDocument.New
     VDraw1.CommandAction.cmdCircle array(1,1,0), 1
     Dim BArray() As Byte
     BArray = doc.SaveToDataBuffer("*.dxf")
     VDraw1.ActiveDocument.New
     VDraw1.Redraw
     Dim bal As Long
     Dim res As Boolean
     bal = UBound(BArray)
     res = doc.LoadFromDataBufferBArray , 0, bal, "*.dxf")
     doc.Redraw True

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