用C#实现生成PDF文档

2024-07-21 02:17:44

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using system;
using system.io;
using system.text;
using system.collections;

namespace pdfgenerator
{

public class pdfgenerator
{
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 streamwriter ppdf=new streamwriter("e://mypdf.pdf");

static memorystream mpdf= new memorystream();

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 void main(string[] args)
{
    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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