- stream
- A System.IO.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.
Visual Basic (Declaration) | |
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Overloads Public Function Load( _ ByVal stream As Stream, _ ByVal offset As Long, _ ByVal count As Long _ ) As RasterImage |
Visual Basic (Usage) | Copy Code |
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Dim instance As RasterCodecs Dim stream As Stream Dim offset As Long Dim count As Long Dim value As RasterImage value = instance.Load(stream, offset, count) |
Parameters
- stream
- A System.IO.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 Leadtools.RasterImage object that this method loads.This example will load an image located in an offset into a stream
Visual Basic | Copy Code |
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Public Sub LoadStreamOffset1Example() Dim codecs As RasterCodecs = New RasterCodecs() Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp") Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1_LoadStreamOffset1.bmp") ' Create a memory stream, add a cutsom header then copy the content of the file ' into this stream. After that, load the image from the stream given the offset Dim ms As MemoryStream = New MemoryStream() ' Add some custom header to the stream (4 bytes) Dim headerSize As Integer = 4 Dim i As Integer = 0 Do While i < headerSize ms.WriteByte(0) i += 1 Loop ' Now append the file into this stream Dim fs As FileStream = File.OpenRead(srcFileName) Const bufferSize As Integer = 1024 Dim buffer As Byte() = New Byte(bufferSize - 1) {} Dim bytesRead As Integer Do bytesRead = fs.Read(buffer, 0, bufferSize) If bytesRead > 0 Then ms.Write(buffer, 0, bytesRead) End If Loop While bytesRead > 0 fs.Close() ' Reset the memory stream position to the beginning ms.Position = 0 ' Now load the image with the offset Dim offset As Long = headerSize Dim count As Long = ms.Length - headerSize Dim image As RasterImage = codecs.Load(ms, offset, count) ' Save this image back to disk codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24) image.Dispose() ' Clean up codecs.Dispose() End Sub Public NotInheritable Class LEAD_VARS Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" End Class |
C# | Copy Code |
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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 cutsom 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:\Users\Public\Documents\LEADTOOLS Images"; } |
SilverlightCSharp | Copy Code |
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SilverlightVB | Copy Code |
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This method can be used to load an image file that is embedded in another stream.
The location of the image is specified as shown in the following simple illustration:
LEADTOOLS will attempt to load corrupted files, so you can see at least a portion of the image. For these images, the load methods succeed, but LoadStatus will return an error code.
This method will load all the pages in a multipage file. The resulting image will have the same bits/pixel and color order value of the image as it was stored in the file.
LEADTOOLS will attempt to load corrupted files, so you can see at least a portion of the image. For these images, the load methods succeed, but LoadStatus will return an error code.
Use the CodecsLoadOptions class to set up other load options parameters before calling this method.
Support for 12 and 16-bit grayscale images is only available in the Document/Medical Imaging editions.
For supported formats, refer to Summary of All Supported Image File Formats.
LEADTOOLS loads all PDF files as Raster PDF uncompressed RasterImageFormat.RasPdf, regardless of the compression and color space used when saving the file.
Target Platforms: Silverlight, Windows XP, Windows Server 2003 family, Windows Server 2008 family, Windows Vista, Windows 7, MAC OS/X (Intel Only)