- (void)totalPagesInStreamAsync:(LTLeadStream *)stream
completion:(void (^)(NSInteger totalPages, NSError * __nullable error))completion
stream
A ILeadStream containing the image data to query.
Number of pages in the specified stream.
NOTE: This topic is part of RasterCodecs
Async support using the .NET System.ComponentMode.AsyncOperation
model. For .NET async/await
,
use Task<CodecsImageInfo> GetInformationAsync(ILeadStream stream, bool totalPages).
GetInformationAsync and GetFormatAsync use GetInformationAsync internally. So, if more information about the image is required, it is recommended to call GetInformationAsync directly and obtain the data once.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Color;
using Leadtools.Svg;
public void LoadPagesFromStreamTest()
{
// Create a new RasterCodecs instance
using (RasterCodecs rasterCodecs = new RasterCodecs())
{
Stream stream = File.OpenRead(Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"));
RasterImageFormat rasterImageFormat = rasterCodecs.GetFormat(stream);
int totalPages = rasterCodecs.GetTotalPages(stream);
// Using extensions in RasterCodecsExtensions
// GetInformationAsync is used to get CodecsImageInfo
using (ILeadStream outputLeadStream = LeadStream.Factory.FromStream(stream))
{
//Using GetInformationAsync to obtain the format data as CodecsImageInfo, instead of the internal GetFormatAsync
Task<CodecsImageInfo> task = rasterCodecs.GetInformationAsync(outputLeadStream, true);
CodecsImageInfo codecsImageInfo = task.Result;
//Get task data
Debug.WriteLine($"Task ID: {task.Id}");
Debug.WriteLine($"Is a Document File: {task.Result.Document.IsDocumentFile}");
Debug.WriteLine($"codecsImageInfo Palette: {codecsImageInfo.GetPalette()}");
// Get total pages using TotalPages instead of GetTotalPagesAsync
Debug.WriteLine($"Total Pages: {task.Result.TotalPages}");
}
// Get the number of pages
int pageCount = rasterCodecs.GetTotalPages(stream);
Debug.WriteLine("Number of pages in the file is {0}", pageCount);
// Load all pages
for (int pageNumber = 1; pageNumber <= pageCount; pageNumber++)
{
using (RasterImage rasterImage = rasterCodecs.Load(stream, pageNumber))
{
Debug.WriteLine("Page {0} loaded", pageNumber);
}
}
}
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images";
}
Help Collections
Raster .NET | C API | C++ Class Library | HTML5 JavaScript
Document .NET | C API | C++ Class Library | HTML5 JavaScript
Medical .NET | C API | C++ Class Library | HTML5 JavaScript
Medical Web Viewer .NET
Multimedia
Direct Show .NET | C API | Filters
Media Foundation .NET | C API | Transforms
Supported Platforms
.NET, Java, Android, and iOS/macOS Assemblies
Imaging, Medical, and Document
C API/C++ Class Libraries
Imaging, Medical, and Document
HTML5 JavaScript Libraries
Imaging, Medical, and Document
Your email has been sent to support! Someone should be in touch! If your matter is urgent please come back into chat.
Chat Hours:
Monday - Friday, 8:30am to 6pm ET
Thank you for your feedback!
Please fill out the form again to start a new chat.
All agents are currently offline.
Chat Hours:
Monday - Friday
8:30AM - 6PM EST
To contact us please fill out this form and we will contact you via email.