使用其他库存在计算不准确和部分压缩文件不支持问题。
安装 pdfinfo
sudo apt install poppler-utils # ubuntu debian
sudo dnf install poppler-utils # centos安装PHP类
composer require "howtomakeaturn/pdfinfo"计算代码
$pdf = new PDFInfo('path/to/the/pdf');
echo $pdf->pages;标签归档：PDF
C#实现自动打印PDF
采用PDFRender4NET
//打印机设置
PrinterSettings settings = new PrinterSettings();
settings.PrinterName = printername;
settings.PrintToFile = false;
settings.Copies = 1;
settings.PrintRange = PrintRange.AllPages;
//设置纸张大小（可以不设置取，取默认设置）
PaperSize ps = new PaperSize("Your Paper Name",595,842);
ps.RawKind = 9; //如果是自定义纸张，就要大于118
//打印设置
PDFRender.Printing.PDFPrintSettings pdfPrintSettings = new PDFRender.Printing.PDFPrintSettings(settings);
pdfPrintSettings.AutoRotate = false; //自动旋转
pdfPrintSettings.BitmapPrintResolution = 560; //图片打印精度
pdfPrintSettings.PaperSize = ps; //纸张尺寸
pdfPrintSettings.PageScaling = PDFRender.Printing.PageScaling.FitToPrinterMarginsProportional;
pdfFile.Print(pdfPrintSettings);
代码详见： https://github.com/HiRaygo/DocumentPrint/blob/master/PdfPrint.cs
采用SumatraPDF或Acrobat Reader方案
public static PrintEngine SumatraPDF = new PrintEngine("Sumatra PDF Reader",
((printerName, filePath, documentName) =>
{
string app = Path.Combine(Program.localPath, "SumatraPDF.exe");
string args = string.Format("-silent -exit-on-print -print-to \"{0}\" \"{1}\"", printerName, filePath);
Process p = new Process();
p.StartInfo = new ProcessStartInfo()
{
CreateNoWindow = true,
WindowStyle = ProcessWindowStyle.Hidden,
FileName = app,
Arguments = args
};
//if (User.isNetworkService())
//{
// p.StartInfo.UserName = Program.config.serviceLogin;
// p.StartInfo.Password = tools.secureString(tools.Decrypt(Program.config.servicePass));
// p.StartInfo.Domain = Program.config.serviceDomain;
// p.StartInfo.LoadUserProfile = true;
// p.StartInfo.UseShellExecute = false;
//}
p.Start();
})){};
/// <summary>
/// Print via external programm Acrobat Reader
/// </summary>
public static PrintEngine AcrobatReader = new PrintEngine("Acrobat Reader",
((printerName, filePath, documentName) =>
{
string app = Registry.LocalMachine.OpenSubKey(
@"SOFTWARE\Microsoft\Windows\CurrentVersion" +
@"\App Paths\AcroRd32.exe"
).GetValue("").ToString()
;
string args = string.Format("/h /t \"{0}\" \"{1}\"", filePath, printerName);
Process p = new Process();
p.StartInfo = new ProcessStartInfo()
{
CreateNoWindow = true,
WindowStyle = ProcessWindowStyle.Hidden,
FileName = app,
Arguments = args
};
//if (User.isNetworkService())
//{
// p.StartInfo.UserName = Program.config.serviceLogin;
// p.StartInfo.Password = tools.secureString(tools.Decrypt(Program.config.servicePass));
// p.StartInfo.Domain = Program.config.serviceDomain;
// p.StartInfo.LoadUserProfile = true;
// p.StartInfo.UseShellExecute = false;
//}
p.Start();
})){};
代码详见： https://github.com/RepairShopr/AutoPrintr-win/blob/master/AutoPrintr/modules/PrintEngines.cs
使用pdfbox给pdf去背景图片
前面采用了Python写的pdfrw做的，发现用acrobat不能编辑。
用pdfbox工具查看发现missing xobject。
java -jar pdfbox-app-2.0.13.jar PDFDebugger out.pdf
所以改用java的pdfbox库来写
package com.c4ys;
import org.apache.pdfbox.contentstream.PDContentStream;
import org.apache.pdfbox.contentstream.operator.Operator;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.pdfparser.PDFStreamParser;
import org.apache.pdfbox.pdfwriter.ContentStreamWriter;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDResources;
import org.apache.pdfbox.pdmodel.common.PDStream;
import org.apache.pdfbox.pdmodel.graphics.PDXObject;
import org.apache.pdfbox.pdmodel.graphics.form.PDFormXObject;
import org.apache.pdfbox.pdmodel.graphics.pattern.PDAbstractPattern;
import org.apache.pdfbox.pdmodel.graphics.pattern.PDTilingPattern;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
public class Main {
public static void main(String[] args) throws IOException {
if (args.length != 3) {
usage();
} else {
PDDocument doc = PDDocument.load(new File(args[0]));
if (doc.isEncrypted()) {
System.err.println(
"Error: Encrypted documents are not supported .");
System.exit(1);
}
for (PDPage page : doc.getPages()) {
List<Object> newTokens = createTokensWithoutImage(page, args[2]);
PDStream newContents = new PDStream(doc);
writeTokensToStream(newContents, newTokens);
page.setContents(newContents);
processResources(page.getResources(), args[2]);
}
doc.save(args[1]);
doc.close();
}
}
private static List<Object> createTokensWithoutImage(PDContentStream contentStream, String im) throws IOException {
PDFStreamParser parser = new PDFStreamParser(contentStream);
Object token = parser.parseNextToken();
List<Object> newTokens = new ArrayList<Object>();
while (token != null) {
if (token instanceof Operator) {
Operator op = (Operator) token;
if (op.getName().equalsIgnoreCase("do")) {
COSName previous = (COSName) newTokens.get(newTokens.size() - 1);
System.out.println(previous.getName());
if (previous.getName().equalsIgnoreCase(im)) {
// remove the argument to this operator
newTokens.remove(newTokens.size() - 1);
token = parser.parseNextToken();
continue;
}
}
}
newTokens.add(token);
token = parser.parseNextToken();
}
return newTokens;
}
private static void processResources(PDResources resources, String im) throws IOException {
for (COSName name : resources.getXObjectNames()) {
PDXObject xobject = resources.getXObject(name);
if (xobject instanceof PDFormXObject) {
PDFormXObject formXObject = (PDFormXObject) xobject;
writeTokensToStream(formXObject.getContentStream(),
createTokensWithoutImage(formXObject, im));
processResources(formXObject.getResources(), im);
}
}
for (COSName name : resources.getPatternNames()) {
PDAbstractPattern pattern = resources.getPattern(name);
if (pattern instanceof PDTilingPattern) {
PDTilingPattern tilingPattern = (PDTilingPattern) pattern;
writeTokensToStream(tilingPattern.getContentStream(),
createTokensWithoutImage(tilingPattern, im));
processResources(tilingPattern.getResources(), im);
}
}
}
private static void writeTokensToStream(PDStream newContents, List<Object> newTokens) throws IOException {
OutputStream out = newContents.createOutputStream(COSName.FLATE_DECODE);
ContentStreamWriter writer = new ContentStreamWriter(out);
writer.writeTokens(newTokens);
out.close();
}
/**
* This will print the usage for this document.
*/
private static void usage() {
System.err.println("Usage: java " + Main.class.getName() + " <input-pdf> <output-pdf> <image-object-name>");
}
}
Python 修改PDF文档尺寸以及去除水印图片
# -*- coding: UTF-8 -*-
import sys
import os
from pdfrw import PageMerge, PdfReader, PdfWriter, IndirectPdfDict
import fitz
# resize
def adjust(page):
info = PageMerge().add(page)
x1, y1, x2, y2 = info.xobj_box
viewrect = ((x2 - 421) / 2, (y2 - 595) / 2, 421, 595)
page = PageMerge().add(page, viewrect=viewrect)
return page.render()
fin, = sys.argv[1:]
fout = 'mid.' + os.path.basename(fin)
reader = PdfReader(fin)
writer = PdfWriter(fout)
for p in reader.pages:
writer.addpage(adjust(p))
writer.trailer.Info = IndirectPdfDict(reader.Info or {})
writer.write()
# trip backgroud images
doc = fitz.open(fout)
for i in range(len(doc)):
imglist = doc.getPageImageList(i)
for img in imglist:
xref = img[0]
if xref==51:
doc._deleteObject(xref)
print(img)
doc.save('new.' + os.path.basename(fin))