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Sample Swift code for using PDFTron SDK to extract images from PDF files, along with their positioning information and DPI. Instead of converting PDF images to a Bitmap, you can also extract uncompressed/compressed image data directly using element.GetImageData() (described in the PDF Data Extraction code sample). Learn more about our Swift PDF Library and PDF Parsing & Content Extraction Library.
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//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2019 by PDFTron Systems Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.
//---------------------------------------------------------------------------------------
import PDFNet
import Foundation
//-----------------------------------------------------------------------------------
// This sample illustrates one approach to PDF image extraction
// using PDFNet.
//
// Note: Besides direct image export, you can also convert PDF images
// to GDI+ Bitmap, or extract uncompressed/compressed image data directly
// using element.GetImageData() (e.g. as illustrated in ElementReaderAdv
// sample project).
//-----------------------------------------------------------------------------------
var image_counter: Int = 0
func ImageExtract(reader: PTElementReader) {
while let element = reader.next() {
switch element.getType() {
case e_ptimage, e_ptinline_image:
image_counter += 1
print("--> Image: \(image_counter)")
print(" Width: \(element.getImageWidth())")
print(" Height: \(element.getImageHeight())")
print(" BPC: \(element.getBitsPerComponent())")
let ctm: PTMatrix2D = element.getCTM()
let x2: Double = 1
let y2: Double = 1
ctm.mult(PTPDFPoint(px: x2, py: y2))
print(" Coords: x1=\(ctm.getM_h()), y1=\(ctm.getM_v()), x2=\(x2), y2=\(y2)")
if element.getType() == e_ptimage {
let image: PTImage = PTImage(image_xobject: element.getXObject())
let path: String = URL(fileURLWithPath: URL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]).appendingPathComponent("").absoluteString).appendingPathComponent("image_extract1_\(image_counter)").path
image.export(toFile: path)
}
case e_ptform:
// Process form XObjects
reader.formBegin()
ImageExtract(reader: reader)
reader.end()
default:
break
}
}
}
func runImageExtractTest() -> Int {
return autoreleasepool {
var ret: Int = 0
// Initialize PDFNet
// Example 1:
// Extract images by traversing the display list for
// every page. With this approach it is possible to obtain
// image positioning information and DPI.
do {
try PTPDFNet.catchException {
let doc: PTPDFDoc = PTPDFDoc(filepath: Bundle.main.path(forResource: "newsletter", ofType: "pdf"))
doc.initSecurityHandler()
let reader: PTElementReader = PTElementReader()
// Read every page
let itr: PTPageIterator = doc.getPageIterator(1)
while itr.hasNext() {
reader.begin(itr.current())
ImageExtract(reader: reader)
reader.end()
itr.next()
}
print("Done...")
}
} catch let e as NSError {
print("\(e)")
ret = 1
}
print("----------------------------------------------------------------")
// Example 2:
// Extract images by scanning the low-level document.
do {
try PTPDFNet.catchException {
let doc: PTPDFDoc = PTPDFDoc(filepath: Bundle.main.path(forResource: "newsletter", ofType: "pdf"))
doc.initSecurityHandler()
image_counter = 0
let cos_doc: PTSDFDoc = doc.getSDFDoc()
let num_objs = cos_doc.xRefSize()
for i in 1..<num_objs {
guard let obj: PTObj = cos_doc.getObj(i) else {
continue
}
if !obj.isFree() && obj.isStream() {
// Process only images
var itr: PTDictIterator = obj.find("Type")
if !itr.hasNext() || !(itr.value().getName() == "XObject") {
continue
}
itr = obj.find("Subtype")
if !itr.hasNext() || !(itr.value().getName() == "Image") {
continue
}
let image: PTImage = PTImage(image_xobject: obj)
image_counter += 1
print("-. Image: \(image_counter)")
print(" Width: \(image.getWidth())")
print(" Height: \(image.getHeight())")
print(" BPC: \(image.getBitsPerComponent())")
let path: String = URL(fileURLWithPath: NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]).appendingPathComponent("image_extract2_\(image_counter)").path
image.export(toFile: path)
}
}
print("Done...")
}
} catch let e as NSError {
print("\(e)")
ret = 1
}
return ret
}
}