ReadExtensions(string,int) Method (original) (raw)
Summary
Loads extensions from the specified EXIF file.
Syntax
C#
Objective-C
C++/CLI
Python
- (nullable LTCodecsExtensionList *)readExtensionsFromFile:(NSString *)file
pageNumber:(NSInteger)_pageNumber_
error:(NSError **)error
Parameters
fileName
The input file name.
pageNumber
1-based index of the page within the file that contains the extension.
Return Value
A CodecsExtensionList object that contains the extensions found in this file.
Example
This example will show detailed information on the streams present in the Exif file.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Color;
using Leadtools.Svg;
public void ExtensionsExample(string exifFileName)
{
RasterCodecs codecs = new RasterCodecs();
string stampFileName = Path.Combine(LEAD_VARS.ImagesDir, "Extension.bmp");
string audioFileNameTemplate = Path.Combine(LEAD_VARS.ImagesDir, "Extension.wav");
// Read the extensions from the file
Debug.WriteLine("Reading the extensions from the exif file");
CodecsExtensionList extensionList = codecs.ReadExtensions(exifFileName, 1);
if (extensionList != null)
{
if ((extensionList.Flags & CodecsExtensionListFlags.Stamp) == CodecsExtensionListFlags.Stamp)
{
Debug.WriteLine("Stamp extension: Found, saving to {0}", stampFileName);
RasterImage stampImage = extensionList.CreateStamp();
codecs.Save(stampImage, stampFileName, RasterImageFormat.Bmp, 24);
stampImage.Dispose();
}
else
Debug.WriteLine("Stamp extension: Not found");
if ((extensionList.Flags & CodecsExtensionListFlags.Audio) == CodecsExtensionListFlags.Audio)
{
Debug.WriteLine("Audio extension: Found, saving ...");
RasterNativeBuffer audioData;
int streamIndex = 0;
do
{
audioData = extensionList.GetAudioData(streamIndex);
if (audioData.Data != IntPtr.Zero)
{
string audioFileName = string.Format(audioFileNameTemplate, streamIndex);
Debug.WriteLine("To {0}", audioFileName);
using (FileStream fs = File.Create(audioFileName))
{
byte[] data = new byte[audioData.Length];
Marshal.Copy(audioData.Data, data, 0, (int)audioData.Length);
fs.Write(data, 0, (int)audioData.Length);
}
streamIndex++;
}
}
while (audioData.Data != IntPtr.Zero);
Debug.WriteLine("{0} total audio streams found", streamIndex);
}
else
Debug.WriteLine("Audio extension: Not found");
CodecsExtension[] extensions = extensionList.GetExtensions();
Debug.WriteLine("Total number of extensions found in the file: {0}", extensions.Length);
for (int i = 0; i < extensions.Length; i++)
{
CodecsExtension extension = extensions[i];
Debug.WriteLine(" {0}. Name: {1}, Clsid: {2}, UCDefault: {3}, DatLength: {4}",
i, extension.Name, extension.Clsid, extension.UCDefault, extension.DataLength);
}
// Finalize cannot be called directly, it is invoked automatically.
// To clean up before exiting, use Dispose
extensionList.Dispose();
}
else
Debug.WriteLine("No extensions were found in the file");
codecs.Dispose();
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images";
}
Leadtools.Codecs Assembly
CompactFile(Stream,Stream,int,int,bool,int,int,bool,int,CodecsSavePageMode,bool,bool) Method
CompactFile(Stream,Stream,int,int,bool,long,int,bool,long,CodecsSavePageMode,bool,bool,bool) Method
CompactFile(string,string,int,int,bool,int,int,bool,int,CodecsSavePageMode,bool,bool) Method
CompactFile(string,string,int,int,bool,long,int,bool,long,CodecsSavePageMode,bool,bool,bool) Method