Getting the number of pages in a PDF [JavaScript in CS3]

Question

Hello All,
I am an InDesign JavaScript newbie that will be posting questions in the near future. Before asking a lot of questions, I would like to contribute something to the group. Here is a function that will query a PDF and return the number of pages that it contains. This is useful for placing multi-page PDFs.
Rick Quatro
rick at frameexpert dot com
function GetPdfPageCount(oFile)
// Convert filename to a VBS-friendly format.
var sFile = oFile.fsName.replace(/\\/g, "\\\\");
var aFile = [sFile]; // An array of arguments.
if(File.fs == "Windows"){
var sGetPdfPageCount = "Dim AcroApp, AVDoc, PDDoc, iPages\r";
sGetPdfPageCount += "Set AcroApp = CreateObject(\"AcroExch.App\")\r";
sGetPdfPageCount += "Set PDDoc = CreateObject(\"AcroExch.PDDoc\")\r";
sGetPdfPageCount += "If PDDoc.Open(arguments(0)) Then\r";
sGetPdfPageCount += " iNumPages = PDDoc.GetNumPages()\r";
sGetPdfPageCount += " Set oInDesign = CreateObject(\"InDesign.Application\")\r";
sGetPdfPageCount += " oInDesign.ScriptArgs.SetValue \"ScriptArgumentA\", CStr(iNumPages)\r";
sGetPdfPageCount += " PDDoc.Close()\r";
sGetPdfPageCount += "End If\r";
sGetPdfPageCount += "Set AcroApp = Nothing\r";
sGetPdfPageCount += "Set PDDoc = Nothing\r";
app.doScript(sGetPdfPageCount, ScriptLanguage.visualBasic,aFile);
return Number(app.scriptArgs.getValue("ScriptArgumentA"));
else
return 0;

Answer 1

Hi Peter,
The solutions that open the PDF files with f.open and look for particular strings don't work for all of the PDF files I have. This one seems to work well for me so far. Thanks for the link.
Rick