Getting PDF page count using Bridge.

[Paul MR]

It seems that Bridge will cache the page count of PDF's, to get this to work, it makes the current window the files path then reads the cache pagecount.

Code: Select all

alert (getPDFCount("~/desktop/PSGUIDE.pdf"));

function getPDFCount(filePath) {
 if (!BridgeTalk.isRunning( "bridge" ) ) BridgeTalk.launch("bridge");   
   var filePath=File(filePath);
      var data;
   if ( BridgeTalk.isRunning( "bridge" ) ) {
     var bt = new BridgeTalk();
     bt.target = "bridge";
     bt.body = 'function a(){app.document.setPresentationMode("browser","' +filePath.path+'");tn = new Thumbnail( File("'+filePath+'") ); return tn.core.itemContent.pageCount}a();';
     bt.onResult = function( inBT ) { data = eval(inBT.body)  }
     bt.onError = function( inBT ) { data = ''; }
     bt.send();
     bt.pump();
     $.sleep( 100 );
     var timeOutAt = ( new Date() ).getTime() + 5000;
     var currentTime = ( new Date() ).getTime();
     while ( ( currentTime < timeOutAt ) && ( undefined == data ) ) {
        bt.pump();
        $.sleep( 100 );
        currentTime = ( new Date() ).getTime();
       }
      }
      if ( undefined == data ) {
        data = '';
      }
     return data;
};



[duke2]

I noticed this wasn't picking up changes in the document (whereby the page count changed). Obviously this is down to the caching. This altered version refreshes the pdf before reporting the page count.

Code: Select all

alert (getPDFCount("~/desktop/PSGUIDE.pdf"));

function getPDFCount(filePath) {
if (!BridgeTalk.isRunning( "bridge" ) ) BridgeTalk.launch("bridge");   
   var filePath=File(filePath);
      var data;
   if ( BridgeTalk.isRunning( "bridge" ) ) {
     var bt = new BridgeTalk();
     bt.target = "bridge";
     bt.body = 'function a(){app.document.setPresentationMode("browser","' +filePath.path+'");tn = new Thumbnail( File("'+filePath+'") ); tn.refresh(); return tn.core.itemContent.pageCount}a();';
     bt.onResult = function( inBT ) { data = eval(inBT.body)  }
     bt.onError = function( inBT ) { data = ''; }
     bt.send();
     bt.pump();
     $.sleep( 100 );
     var timeOutAt = ( new Date() ).getTime() + 5000;
     var currentTime = ( new Date() ).getTime();
     while ( ( currentTime < timeOutAt ) && ( undefined == data ) ) {
        bt.pump();
        $.sleep( 100 );
        currentTime = ( new Date() ).getTime();
       }
      }
      if ( undefined == data ) {
        data = '';
      }
     return data;
};