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Extract Table from PDF Document
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The following code snippet also work with Aspose.PDF.Drawing library.
Extract Table from PDF
// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void Extract_Table()
{
// The path to the documents directory
var dataDir = RunExamples.GetDataDir_AsposePdf_Tables();
// Open PDF document
using (var document = new Aspose.Pdf.Document(dataDir + "the_worlds_cities_in_2018_data_booklet 7.pdf"))
{
foreach (var page in document.Pages)
{
Aspose.Pdf.Text.TableAbsorber absorber = new Aspose.Pdf.Text.TableAbsorber();
absorber.Visit(page);
foreach (var table in absorber.TableList)
{
foreach (var row in table.RowList)
{
foreach (var cell in row.CellList)
{
var textfragment = new Aspose.Pdf.Text.TextFragment();
TextFragmentCollection textFragmentCollection = cell.TextFragments;
foreach (var fragment in textFragmentCollection)
{
string txt = "";
foreach (var seg in fragment.Segments)
{
txt += seg.Text;
}
Console.WriteLine(txt);
}
}
}
}
}
}
}
Extract table border as Image
The page borders are path drawing operations. Therefore the Pdf->Html processing logic just performs drawing instructions and places the background behind the text. So, to repeat the logic, you have to process contents operators manually and draw the graphics yourself. Also please note that following code snippet might not work accurately for various PDF files but if you encounter any issue, please feel free to contact. This code was developed for specific PDF files. The following code snippet shows the steps to extract the table border as Image from PDF document.
// For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
private static void ExtractTableBorder()
{
// The path to the documents directory
var dataDir = RunExamples.GetDataDir_AsposePdf_Tables();
// Open PDF document
using (var document = new Aspose.Pdf.Document(dataDir + "input.pdf"))
{
Stack graphicsState = new Stack();
using (var bitmap = new System.Drawing.Bitmap((int)document.Pages[1].PageInfo.Width, (int)document.Pages[1].PageInfo.Height))
{
System.Drawing.Drawing2D.GraphicsPath graphicsPath = new System.Drawing.Drawing2D.GraphicsPath();
// Default ctm matrix value is 1,0,0,1,0,0
System.Drawing.Drawing2D.Matrix lastCTM = new System.Drawing.Drawing2D.Matrix(1, 0, 0, -1, 0, 0);
// System.Drawing coordinate system is top left based, while pdf coordinate system is low left based, so we have to apply the inversion matrix
System.Drawing.Drawing2D.Matrix inversionMatrix = new System.Drawing.Drawing2D.Matrix(1, 0, 0, -1, 0, (float)document.Pages[1].PageInfo.Height);
System.Drawing.PointF lastPoint = new System.Drawing.PointF(0, 0);
System.Drawing.Color fillColor = System.Drawing.Color.FromArgb(0, 0, 0);
System.Drawing.Color strokeColor = System.Drawing.Color.FromArgb(0, 0, 0);
using (System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(bitmap))
{
gr.SmoothingMode = SmoothingMode.HighQuality;
graphicsState.Push(new System.Drawing.Drawing2D.Matrix(1, 0, 0, 1, 0, 0));
// Process all the contents commands
foreach (var op in document.Pages[1].Contents)
{
var opSaveState = op as Aspose.Pdf.Operators.GSave;
var opRestoreState = op as Aspose.Pdf.Operators.GRestore;
var opCtm = op as Aspose.Pdf.Operators.ConcatenateMatrix;
var opMoveTo = op as Aspose.Pdf.Operators.MoveTo;
var opLineTo = op as Aspose.Pdf.Operators.LineTo;
var opRe = op as Aspose.Pdf.Operators.Re;
var opEndPath = op as Aspose.Pdf.Operators.EndPath;
var opStroke = op as Aspose.Pdf.Operators.Stroke;
var opFill = op as Aspose.Pdf.Operators.Fill;
var opEOFill = op as Aspose.Pdf.Operators.EOFill;
var opRGBFillColor = op as Aspose.Pdf.Operators.SetRGBColor;
var opRGBStrokeColor = op as Aspose.Pdf.Operators.SetRGBColorStroke;
if (opSaveState != null)
{
// Save previous state and push current state to the top of the stack
graphicsState.Push(((System.Drawing.Drawing2D.Matrix)graphicsState.Peek()).Clone());
lastCTM = (System.Drawing.Drawing2D.Matrix)graphicsState.Peek();
}
else if (opRestoreState != null)
{
// Throw away current state and restore previous one
graphicsState.Pop();
lastCTM = (System.Drawing.Drawing2D.Matrix)graphicsState.Peek();
}
else if (opCtm != null)
{
System.Drawing.Drawing2D.Matrix cm = new System.Drawing.Drawing2D.Matrix(
(float)opCtm.Matrix.A,
(float)opCtm.Matrix.B,
(float)opCtm.Matrix.C,
(float)opCtm.Matrix.D,
(float)opCtm.Matrix.E,
(float)opCtm.Matrix.F);
// Multiply current matrix with the state matrix
((System.Drawing.Drawing2D.Matrix)graphicsState.Peek()).Multiply(cm);
lastCTM = (System.Drawing.Drawing2D.Matrix)graphicsState.Peek();
}
else if (opMoveTo != null)
{
lastPoint = new System.Drawing.PointF((float)opMoveTo.X, (float)opMoveTo.Y);
}
else if (opLineTo != null)
{
System.Drawing.PointF linePoint = new System.Drawing.PointF((float)opLineTo.X, (float)opLineTo.Y);
graphicsPath.AddLine(lastPoint, linePoint);
lastPoint = linePoint;
}
else if (opRe != null)
{
System.Drawing.RectangleF re = new System.Drawing.RectangleF((float)opRe.X, (float)opRe.Y, (float)opRe.Width, (float)opRe.Height);
graphicsPath.AddRectangle(re);
}
else if (opEndPath != null)
{
graphicsPath = new System.Drawing.Drawing2D.GraphicsPath();
}
else if (opRGBFillColor != null)
{
fillColor = opRGBFillColor.getColor();
}
else if (opRGBStrokeColor != null)
{
strokeColor = opRGBStrokeColor.getColor();
}
else if (opStroke != null)
{
graphicsPath.Transform(lastCTM);
graphicsPath.Transform(inversionMatrix);
gr.DrawPath(new System.Drawing.Pen(strokeColor), graphicsPath);
graphicsPath = new System.Drawing.Drawing2D.GraphicsPath();
}
else if (opFill != null)
{
graphicsPath.FillMode = FillMode.Winding;
graphicsPath.Transform(lastCTM);
graphicsPath.Transform(inversionMatrix);
gr.FillPath(new System.Drawing.SolidBrush(fillColor), graphicsPath);
graphicsPath = new System.Drawing.Drawing2D.GraphicsPath();
}
else if (opEOFill != null)
{
graphicsPath.FillMode = FillMode.Alternate;
graphicsPath.Transform(lastCTM);
graphicsPath.Transform(inversionMatrix);
gr.FillPath(new System.Drawing.SolidBrush(fillColor), graphicsPath);
graphicsPath = new System.Drawing.Drawing2D.GraphicsPath();
}
}
}
bitmap.Save(dataDir + "ExtractTableBorder_out.png", ImageFormat.Png);
}
}
}