Overloads Public Sub Load( _
   ByVal stream As Stream, _
   ByVal offset As Long, _
   ByVal count As Long _
) 

Visual Basic (Usage)	Copy Code
Dim instance As RasterImageViewer Dim stream As Stream Dim offset As Long Dim count As Long   instance.Load(stream, offset, count)

public void Load( 
   Stream stream,
   long offset,
   long count
)

public: void Load( 
   Stream* stream,
   long offset,
   long count
) 

public:
void Load( 
   Stream^ stream,
   long offset,
   long count
) 

Parameters

stream

A Stream containing the image data to load.

offset

Offset from the beginning of the stream at which loading should begin.

count

Total size of the image file data.

This example will load an image located in an offset into a stream.

Visual Basic

Copy Code

Public Sub RasterImageViewer_Load3(ByVal viewer As RasterImageViewer)    Dim srcFileName As String = "C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\Image1.cmp"    Dim destFileName As String = "C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\Image1_LoadStreamOffset1.bmp"       ' Create a memory stream, add a custom header and then copy the content of the file       ' into this stream. After that, load the image from the stream using the offset.    Dim ms As MemoryStream = New MemoryStream()       ' Add a 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 using the offset    Dim offset As Long = headerSize    Dim count As Long = ms.Length - headerSize    viewer.Load(ms, offset, count)    ' Save this image back to disk    viewer.Save(destFileName, RasterImageFormat.Bmp, 24, 0) End Sub

C#

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public void RasterImageViewer_Load3(RasterImageViewer viewer)  {     string srcFileName = @"C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\Image1.cmp";     string destFileName = @"C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\Image1_LoadStreamOffset1.bmp";       // Create a memory stream, add a custom header and then copy the content of the file     // into this stream.  After that, load the image from the stream using the given offset.       MemoryStream ms = new MemoryStream();       // Add a 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;     viewer.Load(ms, offset, count);       // Save this image back to disk     viewer.Save(destFileName, RasterImageFormat.Bmp, 24, 0);  }

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.

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: Microsoft .NET Framework 3.0, Windows XP, Windows Vista, and Windows Server 2003 family

Reference