TX Text Control .NET 15.0 introduced the page rendering engine that allows you to export a metafile or a bitmap of each separate page. This enables developers to create thumbnails of the pages or to export images to view them in a browser. This sample shows how to create a multipage TIFF image from all pages of a document.
Two significant steps are required to create these images:
First, it is required to iterate through all pages of TX Text Control to create separate TIFF images:
ArrayList inputImages = new ArrayList();
foreach (Page page in textControl1.GetPages())
{
MemoryStream image = new MemoryStream();
Bitmap bitmap = page.GetImage(100, TXTextControl.Page.PageContent.All);
bitmap.Save(image, ImageFormat.Tiff);
inputImages.Add(image);
}Dim inputImages As New ArrayList()
For Each page As Page In textControl1.GetPages()
Dim image As New MemoryStream()
Dim bitmap As Bitmap = page.GetImage(100, TXTextControl.Page.PageContent.All)
bitmap.Save(image, ImageFormat.Tiff)
inputImages.Add(image)
NextEach TIFF image is stored in a memory stream which is added to an ArrayList for an easier handling when combining them.
In a second step, the TIFF images are combined to a single image. Therefore, a new image is created in order to append all other images from the ArrayList to a new frame of the new image using the SaveAdd method.
public static void CreateMultipageTIF(ArrayList InputImages, string Filename)
{
// set the image codec
ImageCodecInfo info = null;
foreach (ImageCodecInfo ice in ImageCodecInfo.GetImageEncoders())
{
if (ice.MimeType == "image/tiff")
{
info = ice;
break;
}
}
EncoderParameters ep = new EncoderParameters(2);
bool firstPage = true;
System.Drawing.Image img = null;
// create an image instance from the 1st image
for (int nLoopfile = 0; nLoopfile < InputImages.Count; nLoopfile++)
{
//get image from src file
System.Drawing.Image img_src = System.Drawing.Image.FromStream((Stream)InputImages[nLoopfile]);
Guid guid = img_src.FrameDimensionsList[0];
System.Drawing.Imaging.FrameDimension dimension = new System.Drawing.Imaging.FrameDimension(guid);
//get the frames from src file
for (int nLoopFrame = 0; nLoopFrame < img_src.GetFrameCount(dimension); nLoopFrame++)
{
img_src.SelectActiveFrame(dimension, nLoopFrame);
ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Compression, Convert.ToInt32(EncoderValue.CompressionLZW));
// if first page, then create the initial image
if (firstPage)
{
img = img_src;
ep.Param[1] = new EncoderParameter(System.Drawing.Imaging.Encoder.SaveFlag, Convert.ToInt32(EncoderValue.MultiFrame));
img.Save(Filename, info, ep);
firstPage = false;
continue;
}
// add image to the next frame
ep.Param[1] = new EncoderParameter(System.Drawing.Imaging.Encoder.SaveFlag, Convert.ToInt32(EncoderValue.FrameDimensionPage));
img.SaveAdd(img_src, ep);
}
}
ep.Param[1] = new EncoderParameter(System.Drawing.Imaging.Encoder.SaveFlag, Convert.ToInt32(EncoderValue.Flush));
img.SaveAdd(ep);
}Public Shared Sub CreateMultipageTIF(InputImages As ArrayList, Filename As String)
' set the image codec
Dim info As ImageCodecInfo = Nothing
For Each ice As ImageCodecInfo In ImageCodecInfo.GetImageEncoders()
If ice.MimeType = "image/tiff" Then
info = ice
Exit For
End If
Next
Dim ep As New EncoderParameters(2)
Dim firstPage As Boolean = True
Dim img As System.Drawing.Image = Nothing
' create an image instance from the 1st image
For nLoopfile As Integer = 0 To InputImages.Count - 1
' get image from src file
Dim img_src As System.Drawing.Image = System.Drawing.Image.FromStream(DirectCast(InputImages(nLoopfile), Stream))
Dim guid As Guid = img_src.FrameDimensionsList(0)
Dim dimension As New System.Drawing.Imaging.FrameDimension(guid)
' get the frames from src file
For nLoopFrame As Integer = 0 To img_src.GetFrameCount(dimension) - 1
img_src.SelectActiveFrame(dimension, nLoopFrame)
ep.Param(0) = New EncoderParameter(System.Drawing.Imaging.Encoder.Compression, Convert.ToInt32(EncoderValue.CompressionLZW))
' if first page, then create the initial image
If firstPage Then
img = img_src
ep.Param(1) = New EncoderParameter(System.Drawing.Imaging.Encoder.SaveFlag, Convert.ToInt32(EncoderValue.MultiFrame))
img.Save(Filename, info, ep)
firstPage = False
Continue For
End If
' add image to the next frame
ep.Param(1) = New EncoderParameter(System.Drawing.Imaging.Encoder.SaveFlag, Convert.ToInt32(EncoderValue.FrameDimensionPage))
img.SaveAdd(img_src, ep)
Next
Next
ep.Param(1) = New EncoderParameter(System.Drawing.Imaging.Encoder.SaveFlag, Convert.ToInt32(EncoderValue.Flush))
img.SaveAdd(ep)
End Sub