pdf_text_extraction

Description:

pdf text extraction

A library to extract text from PDF #
This lib only works on Linux and Windows at the moment as it depends on compiling forked xpdf for the proper platform. #
https://github.com/insinfo/xpdf
on linux it depends on the GNU v3 standard C++ library (libstdc++6): #
sudo apt-get install libstdc++6
example 1 low level #
import 'dart:io' show Platform, Directory;
import 'package:ffi/ffi.dart';
import 'dart:ffi';
import 'package:path/path.dart' as path;
import 'package:pdf_text_extraction/pdf_text_extraction.dart';
import 'package:pdf_text_extraction/src/pdf_to_text_bindings.dart';

void logCallback(Pointer<Int8> msg) {
print(nativeInt8ToString(msg));
}

void main() {
var libraryPath = path.join(Directory.current.path, 'pdftotext.dll');
if (Platform.isLinux) {
libraryPath = path.join(Directory.current.path, 'pdftotext.so');
}

final dylib = DynamicLibrary.open(libraryPath);
var pdfLib = PDFToTextBindings(dylib);
//input pdf file
var uriPointer = stringToNativeInt8('pdf_file.pdf', allocator: calloc);
// output text character encoding
var textOutEnc = stringToNativeInt8('UTF-8', allocator: calloc);
var layout = stringToNativeInt8('rawOrder', allocator: calloc);
//function for print log info
var lgf = Pointer.fromFunction<Void Function(Pointer<Int8>)>(logCallback);

Pointer<Pointer<Int8>> textOut = calloc();

var result = pdfLib.extractText(
uriPointer, 1, 1, textOutEnc, layout, textOut, lgf, nullptr, nullptr);

var textResult = nativeInt8ToString(textOut.value);

calloc.free(uriPointer);
calloc.free(textOutEnc);
calloc.free(textOut);

if (result == 0) {
print('result ok: $textResult');
} else {
print('erro on text extraction');
}
}
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example 2 hi level #
void main() {
var pdfLib = PDFToTextWrapping();
var textResult = pdfLib.extractText('pdf_file.pdf', startPage: 1, endPage: 0);
print('result: $textResult');
}
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