Load(Stream,long,long) Method (original) (raw)
Summary
Loads an image file, letting you specify the location of the image data within the stream.
Syntax
Parameters
stream
A Stream containing the image data to load.
offset
Offset from the beginning of the stream at which loading should start.
count
Total size of the image file data.
Return Value
The RasterImage object that this method loads.
Example
This example will load an image located in an offset into a stream
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Color;
using Leadtools.Svg;
public void LoadStreamOffset1Example()
{
RasterCodecs codecs = new RasterCodecs();
string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp");
string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_LoadStreamOffset1.bmp");
// Create a memory stream, add a custom header then copy the content of the file
// into this stream. After that, load the image from the stream given the offset
MemoryStream ms = new MemoryStream();
// Add some custom header to the stream (4 bytes)
int headerSize = 4;
for (int i = 0; i < headerSize; i++)
ms.WriteByte(0);
// Now append the file into this stream
FileStream fs = File.OpenRead(srcFileName);
const int bufferSize = 1024;
byte[] buffer = new byte[bufferSize];
int bytesRead;
do
{
bytesRead = fs.Read(buffer, 0, bufferSize);
if (bytesRead > 0)
ms.Write(buffer, 0, bytesRead);
}
while (bytesRead > 0);
fs.Close();
// Reset the memory stream position to the beginning
ms.Position = 0;
// Now load the image with the offset
long offset = headerSize;
long count = ms.Length - headerSize;
RasterImage image = codecs.Load(ms, offset, count);
// Save this image back to disk
codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24);
image.Dispose();
// Clean up
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