用C#读取PDF，PDG
2024-07-21 02:26:04
供稿：网友
//创建pdf文件
using system;
using system.io;
using system.text;
using system.collections;
namespace paladin.utility
{
/// <summary>
/// topdf 的摘要说明。
/// </summary>
public class topdf
{
static float pagewidth = 594.0f;
static float pagedepth = 828.0f;
static float pagemargin = 30.0f;
static float fontsize = 20.0f;
static float leadsize = 10.0f;
static memorystream mpdf= new memorystream();
public topdf()
{
//
// todo: 在此处添加构造函数逻辑
//
}
static void converttobyteandaddtostream(string strmsg)
{
byte[] buffer=null;
buffer=asciiencoding.ascii.getbytes(strmsg);
mpdf.write(buffer,0,buffer.length);
buffer=null;
}
static string xrefformatting(long xvalue)
{
string strmsg =xvalue.tostring();
int ilen=strmsg.length;
if (ilen<10)
{
stringbuilder s=new stringbuilder();
int i=10-ilen;
s.append('0',i);
strmsg=s.tostring() + strmsg;
}
return strmsg;
}
static public void createpdf(string filepath)
{
streamwriter ppdf=new streamwriter(filepath);
arraylist xrefs=new arraylist();
//byte[] buffer=null;
float ypos =0f;
long streamstart=0;
long streamend=0;
long streamlen =0;
string strpdfmessage=null;
//pdf文档头信息
strpdfmessage="%pdf-1.1/n";
converttobyteandaddtostream(strpdfmessage);
xrefs.add(mpdf.length);
strpdfmessage="1 0 obj/n";
converttobyteandaddtostream(strpdfmessage);
strpdfmessage="<< /length 2 0 r >>/n";
converttobyteandaddtostream(strpdfmessage);
strpdfmessage="stream/n";
converttobyteandaddtostream(strpdfmessage);
////////pdf文档描述
streamstart=mpdf.length;
//字体
strpdfmessage="bt/n/f0 " + fontsize +" tf/n";
converttobyteandaddtostream(strpdfmessage);
//pdf文档实体高度
ypos = pagedepth - pagemargin;
strpdfmessage=pagemargin + " " + ypos +" td/n" ;
converttobyteandaddtostream(strpdfmessage);
strpdfmessage= leadsize+" tl/n" ;
converttobyteandaddtostream(strpdfmessage);
//实体内容
strpdfmessage= "(http://www.wenhui.org)tj/n" ;
converttobyteandaddtostream(strpdfmessage);
strpdfmessage= "et/n";
converttobyteandaddtostream(strpdfmessage);
streamend=mpdf.length;
streamlen=streamend-streamstart;
strpdfmessage= "endstream/nendobj/n";
converttobyteandaddtostream(strpdfmessage);
//pdf文档的版本信息
xrefs.add(mpdf.length);
strpdfmessage="2 0 obj/n"+ streamlen + "/nendobj/n";
converttobyteandaddtostream(strpdfmessage);
xrefs.add(mpdf.length);
strpdfmessage="3 0 obj/n<</type/page/parent 4 0 r/contents 1 0 r>>/nendobj/n";
converttobyteandaddtostream(strpdfmessage);
xrefs.add(mpdf.length);
strpdfmessage="4 0 obj/n<</type /pages /count 1/n";
converttobyteandaddtostream(strpdfmessage);
strpdfmessage="/kids[/n3 0 r/n]/n";
converttobyteandaddtostream(strpdfmessage);
strpdfmessage="/resources<</procset[/pdf/text]/font<</f0 5 0 r>> >>/n";
converttobyteandaddtostream(strpdfmessage);
strpdfmessage="/mediabox [ 0 0 "+ pagewidth + " " + pagedepth + " ]/n>>/nendobj/n";
converttobyteandaddtostream(strpdfmessage);
xrefs.add(mpdf.length);
strpdfmessage="5 0 obj/n<</type/font/subtype/type1/basefont/courier/encoding/winansiencoding>>/nendobj/n";
converttobyteandaddtostream(strpdfmessage);
xrefs.add(mpdf.length);
strpdfmessage="6 0 obj/n<</type/catalog/pages 4 0 r>>/nendobj/n";
converttobyteandaddtostream(strpdfmessage);
streamstart=mpdf.length;
strpdfmessage="xref/n0 7/n0000000000 65535 f /n";
for(int i=0;i<xrefs.count;i++)
{
strpdfmessage+=xrefformatting((long) xrefs[i])+" 00000 n /n";
}
converttobyteandaddtostream(strpdfmessage);
strpdfmessage="trailer/n<</n/size "+ (xrefs.count+1)+"/n/root 6 0 r/n>>/n";
converttobyteandaddtostream(strpdfmessage);
strpdfmessage="startxref/n" + streamstart+"/n%%eof/n";
converttobyteandaddtostream(strpdfmessage);
mpdf.writeto(ppdf.basestream);
mpdf.close();
ppdf.close();
}
}
}
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