pyPdf用于IndirectObject提取（python提取pdf信息）

按照此示例，我可以将所有元素列出到pdf文件中

import pyPdfpdf = pyPdf.PdfFileReader(open("pdffile.pdf"))list(pdf.pages) # Process all the objects.print pdf.resolvedObjects

现在，我需要从pdf文件中提取非标准对象。

我的对象是一个名为MYOBJECT的对象，它是一个字符串。

与我有关的python脚本打印的部分是：

{''/MYOBJECT'': IndirectObject(584, 0)}

pdf文件是这样的：

558 0 obj<</Contents 583 0 R/CropBox[0 0 595.22 842]/MediaBox[0 0 595.22 842]/Parent 29 0 R/Resources  <</ColorSpace <</CS0 563 0 R>>    /ExtGState <</GS0 568 0 R>>    /Font<</TT0 559 0 R/TT1 560 0 R/TT2 561 0 R/TT3 562 0 R>>    /ProcSet[/PDF/Text/ImageC]    /Properties<</MC0<</MYOBJECT 584 0 R>>/MC1<</SubKey 582 0 R>> >>    /XObject<</Im0 578 0 R>>>>  /Rotate 0/StructParents 0/Type/Page>>endobj.........584 0 obj<</Length 8>>stream1_22_4_1     --->>>>  this is the string I need to extract from the objectendstreamendobj

我如何跟随584值以引用我的字符串（当然在pyPdf下）？

答案1

中的每个元素pdf.pages都是字典，因此假设它在第1页上，pdf.pages[0][''/MYOBJECT'']应该是您想要的元素。

您可以尝试单独打印或戳在它help和dir在提示更多关于如何得到你想要的字符串蟒蛇

编辑：

收到pdf副本后，我在找到了对象，pdf.resolvedObjects[0][558][''/Resources''][''/Properties''][''/MC0''][''/MYOBJECT'']可以通过getData（）检索值

以下函数通过递归查找有问题的密钥提供了一种更通用的解决方案

import typesimport pyPdfpdf = pyPdf.PdfFileReader(open(''file.pdf''))pages = list(pdf.pages)def findInDict(needle,haystack):    for key in haystack.keys():        try:            value = haystack[key]        except:            continue        if key == needle:            return value        if type(value) == types.DictType or isinstance(value,pyPdf.generic.DictionaryObject):              x = findInDict(needle,value)            if x is not None:                return xanswer = findInDict(''/MYOBJECT'',pdf.resolvedObjects).getData()

active-directory – 如何匿名获取Active Directory域objectGUID

dsquery * "DC=lab,DC=local" -scope base -attr objectguid

# rpcclient -U% labdc01.lab.local -c lsaquery
Domain Name: LAB 
Domain Sid: S-1-5-21-3869872838-1836277878-698564084

angular – 无法解析AuthenticationService的所有参数：([object Object],？,[object Object])

@Inject(forwardRef(() => AuthenticationService)) public authService: AuthenticationService

import { Injectable } from '@angular/core';
import {Http,Headers,Response} from '@angular/http';
import 'rxjs/add/operator/toPromise';
import {Observable} from 'rxjs/Rx';

import {AppServices} from "../../app.services";
import {Router} from "@angular/router";

@Injectable()
export class AuthenticationService {
  public token: any;

  constructor(
    private http: Http,private appService: AppServices,private router: Router
  ) {
    this.token = localStorage.getItem('token');
  }

  login(username: string,password: string): Observable<boolean> {
    let headers = new Headers();
    let body = null;
    headers.append("Authorization",("Basic " + btoa(username + ':' + password)));

    return this.http.post(this.appService.api + '/login',body,{headers: headers})
      .map((response: Response) => {
        let token = response.json() && response.json().token;
        if (token) {
          this.token = token;
          localStorage.setItem('Conform_token',token);
          return true;
        } else {
          return false;
        }
      });
  }

  logout(): void {
    this.token = null;
    localStorage.removeItem('Conform_token');
    this.router.navigate(['/login']);
  }
}

import {Injectable} from '@angular/core';
import {Headers,Http,RequestOptions} from '@angular/http';
import {Router} from "@angular/router";
import {AuthenticationService} from "./auth/auth.service";

import 'rxjs/add/operator/toPromise';
import {Observable} from 'rxjs/Rx';

@Injectable()

export class AppServices {

  api = '//endpoint/';

  public options: any;
  constructor(
    private http: Http,private router: Router,public authService: AuthenticationService // doesn't work
  //  @Inject(forwardRef(() => AuthenticationService)) public authService: AuthenticationService // doesn't work either
      ) {
        let head = new Headers({
      'Authorization': 'Bearer ' + this.authService.token,"Content-Type": "application/json; charset=utf8"
    });
    this.options = new RequestOptions({headers: head});
  }

  // ====================
  //    data services
  // ====================

  getData(): Promise<any> {
    return this.http
      .get(this.api + "/data",this.options)
      .toPromise()
      .then(response => response.json() as Array<Object>)
      .catch((err)=>{this.handleError(err);})
  }

import { browserModule } from '@angular/platform-browser';
import { browserAnimationsModule } from '@angular/platform-browser/animations';

import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import {BaseRequestOptions,HttpModule} from '@angular/http';

import { MaterialModule} from '@angular/material';
import {FlexLayoutModule} from "@angular/flex-layout";
import 'hammerjs';

import { routing,appRoutingProviders }  from './app.routing';
import { AppServices } from './app.services';
import {AuthGuard} from "./auth/auth.guard";
import {AuthenticationService} from "./auth/auth.service";

import {AppComponent} from './app.component';
import {AuthComponent} from './auth/auth.component';
import {NotFoundComponent} from './404/not-found.component';
import { HomeComponent } from './home/home.component';

@NgModule({
  declarations: [
    AppComponent,AuthComponent,NotFoundComponent,HomeComponent
  ],imports: [
    browserModule,browserAnimationsModule,FormsModule,HttpModule,routing,MaterialModule,FlexLayoutModule
  ],providers: [AppServices,AuthGuard,AuthenticationService],bootstrap: [AppComponent]
})
export class AppModule { }

export class AuthenticationService {
  public token: any;
  appService: AppServices;
  constructor(
    private http: Http,// private appService: AppServices,injector:Injector;
    private router: Router
  ) {
    setTimeout(() => this.appService = injector.get(AppServices));
    this.token = localStorage.getItem('token');
  }

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