LoadAsync(ILeadStream,Int32,CodecsLoadByteOrder,Int32,Int32) Method

RasterCodecsExamples.prototype.LoadFile2Example = function ( )
{
   Tools.SetLicense ( ) ;
   with (Leadtools) {
      with (Leadtools.Codecs) {
         var codecs = new RasterCodecs();
         var loadFile;
         var image;
         var info;
         var bitsPerPixel;
         var first = 1;
         var last = 1;
         // First, test loading as different color byte order and bits per pixel
         var singlePageFileName = "Assets\\Image1.cmp";

         // Get the file information
         return Tools.AppInstallFolder().getFileAsync(singlePageFileName).then(function (ldFil) {
            loadFile = ldFil;
            return codecs.getInformationAsync(LeadStreamFactory.create(loadFile), true, 1)
         }).then(function (info) {

            console.info("Order according to info is: ", info.order, ", bits/pixel is: ", info.bitsPerPixel);

            // Now, load this file with different color byte order and bits per pixel
            bitsPerPixel = 1;
            return codecs.loadAsync(LeadStreamFactory.create(loadFile), bitsPerPixel, CodecsLoadByteOrder.rgb, 1, 1)
         })
         .then(function (img) {
            image = img;
            console.info("Loaded as ", image.order, " order and ", image.bitsPerPixel, " bits/pixel");
            console.assert(bitsPerPixel === image.bitsPerPixel, "bitsPerPixel === image.BitsPerPixel");
            image.close();

            var multiPageFileName = "Assets\\Eye.gif";

            // Get the file information (we are interested in the number of pages)
            return Tools.AppInstallFolder().getFileAsync(multiPageFileName)
         }).then(function (loadFile2) {
            loadFile = loadFile2;
            return codecs.getInformationAsync(LeadStreamFactory.create(loadFile), true, 1)
         })
         .then(function (inf) {
            info = inf;
            console.info("Number of pages according to info: ", info.totalPages);

            // Load the first page

            return codecs.loadAsync(LeadStreamFactory.create(loadFile), 0, CodecsLoadByteOrder.bgrOrGray, first, last)
         })
         .then(function (img) {
            image = img;
            console.info("Loading pages ", first, "to ", last, ", pages loaded = ", image.pageCount);
            console.assert(image.pageCount == last - first + 1, "image.pageCount == last - first + 1");
            image.close();

            // Load the second page
            first = 2;
            last = 2;
            return codecs.loadAsync(LeadStreamFactory.create(loadFile), 0, CodecsLoadByteOrder.bgrOrGray, first, last)
         })
         .then(function (img) {
            image = img;
            console.info("Loading pages ", first, "to ", last, ", pages loaded = ", image.pageCount);
            console.assert(image.pageCount == last - first + 1, "image.pageCount == last - first + 1");
            image.close();

            // Load from the second page to the second before last page
            first = 2;
            last = info.totalPages - 1;
            return codecs.loadAsync(LeadStreamFactory.create(loadFile), 0, CodecsLoadByteOrder.bgrOrGray, first, last)
         })
         .then(function (img) {
            image = img;
            console.info("Loading pages ", first, "to ", last, ", pages loaded = ", image.pageCount);
            console.assert(image.pageCount == last - first + 1, "image.pageCount == last - first + 1");
            image.close();

            // load all the pages
            return codecs.loadAsync(LeadStreamFactory.create(loadFile), 0, CodecsLoadByteOrder.bgrOrGray, 1, -1)
         })
         .then(function (img) {
            image = img;
            console.info("Loading all pages, pages loaded = ", image.pageCount);
            console.assert(image.pageCount === info.totalPages);
            image.close();

            // Clean up
            codecs.close();
         });
      }
   }
}