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getPDFPageLength.jsx

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f = File.openDialog ("select PDF file...");

alert(pdfPageCount(f));

function pdfPageCount(fNm)

{

if(fNm == null) return -1;

var f = new File(fNm);

f.encoding = "Binary";

if(!f.open("r")) return -1;

f.seek(0, 0);

var str = f.read();

f.close();

if(!str) return -1;

var ps = str.match(/<<\/Count\s\d+.+?>>/g);

if(ps!=null)

{

for (var i=0;i<ps.length;i++)

{

if (ps[i].indexOf("/Type/Pages")>-1)

{

ps = ps[i].match(/<<\/Count\s(\d+)/);

lim = parseInt(ps[1]);

if(isNaN(lim)) return -1;

return lim;

}

}

}

ps = str.match(/<<.+?\/Type\s\/Pages.+?>>/);

if(ps!=null)

{

ps = ps[0].match(/\/Count\s(\d+)/);

lim = parseInt(ps[1]);

if(isNaN(lim)) return -1;

return lim;

}

var ix, _ix, lim;

ix = str.indexOf("/N ");

_ix = str.indexOf("/T", ix);

lim = parseInt(str.substring(ix+3, _ix));

if(isNaN(lim)) return -1;

return lim;

}