TImageEnView.LayersImport

Declaration

function LayersImport(const FileName: String; Stream: TStream = nil; FileFormat: TIOFileType = ioUnknown; Append: Boolean = False; PdfPage: Integer = 0): Integer;

Description

Imports layers from a file or stream in PDF, IEV, ALL or DXF format.

Parameter	Description
FileName	The full path to a file to import (or '' if importing from a stream)
Stream	A stream to import from (or nil if importing from file)
FileFormat	The type of file, if known. It should be one ioIEV, ioALL or ioDXF. You can also specify ioUnknown, whereby ImageEn will infer the format from the content (with DXF only the file extension is considered)
Append	When false the existing content is cleared before importing
PdfPage	If importing from a multiple page PDF file, specify which page to import from

Result is -1 in the case of an error, otherwise returns the number of layers added.

Note: For more control over PDF importing, use AssignAsLayers

Importing from PDF
ImageEn will import the following PDF Object types:
- Images: Imported as a TIEImageLayer. Transparency may be lost for some PDF image types
- Text: Imported as a TIETextLayer. Fonts that are unavailable on the system will be substituted. Font sizes may not be correct
- Paths: Imported as a TIEPolylineLayer, or TIELineLayer if only two points. Bezier curves will be treated as lines, Alternate and Winding fills are treated as explicitly closed fills

Shading and Form objects are ignored.

Importing from IEV/ALL
IEV and ALL are object formats of TImageEnVect.
Conversion is as follows:

Object Kind	Converted To	Notes
iekLINE	TIELineLayer	-
iekBOX	TIEShapeLayer	-
iekELLIPSE	TIEShapeLayer	-
iekARC	TIEPolylineLayer	-
iekBITMAP	TIEImageLayer	-
iekTEXT	TIETextLayer	-
iekRULER	Skipped	-
iekPOLYLINE	TIEPolylineLayer	-
iekANGLE	TIEAngleLayer	-
iekMEMO	TIETextLayer	Text formatting is lost
iekLINELABEL	TIELineLayer	Inward arrows are converted to outward arrows

Importing from DXF
DXF is an Autocad vector format. DXF file can only be imported from file and only lines and ellipses objects are supported.

Examples

// Import from an PDF file (replacing the existing layers)
ImageEnView1.LayersImport( 'C:\Document.pdf' );

// Import from an PDF stream (adding to the existing layers)
ImageEnView1.LayersImport( '', myStream, ioPDF, True );

// Import from an IEV file (adding to the existing layers)
ImageEnView1.LayersImport( 'C:\Vect.iev', nil, ioIEV, True );

// Import from an IEV stream (replacing the existing layers)
ImageEnView1.LayersImport( '', myStream );

// Import from an Autocad file
ImageEnView1.LayersImport( 'C:\cad.dxf', nil, ioDXF );

TImageEnView.LayersImport