public string GetText(
int zoneIndex
)
Function GetText( _
ByVal zoneIndex As Integer _
) As String
- (nullable NSString *)textForZoneAtIndex:(NSInteger)index error:(NSError **)error
public String getText(int zoneIndex)
String^ GetText(
int zoneIndex
)
zoneIndex
0-based index of the zone. Pass -1 for this parameter to get the text for all page zones at once.
A String containing the recognized characters found (or an empty string if zones on the page contains no recognition data).
Use this method to get the document result in a simple String object. Getting the result as text is helpful in situations when adding zones manually for form processing. For example, suppose the form you are processing has two areas of interests, a name field at coordinates 100, 100, 400, 120 and a social security number at coordinates 100, 200, 400, 220. You can structure your application as follows:
Create a new IOcrPage object from the form image using IOcrEngine.CreatePage.
Add the name zone manually:
OcrZone nameZone = new OcrZone();
nameZone.ZoneType = OcrZoneType.Text;
nameZone.Bounds = new LeadRect(100, 100, 400, 120);
ocrPage.Zones.Add(nameZone);
Recognize the page (only this one zone will recognized):
ocrPage.Recognize();
Get the value of the name field:
string name = ocrPage.GetText(0);
Remove the name zone from the page:
ocrPage.Zones.Clear();
Repeat the steps from (2) above to get the social security field.
This example gets the values of particular fields from a document.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Ocr;
using Leadtools.Forms.Common;
using Leadtools.WinForms;
using Leadtools.Drawing;
public void RecognizeTextExample()
{
// Get the form file name
Console.WriteLine("Setting up the form...");
string formFileName = GetMyForm();
// Assume we get the field information from an external source such as a database or an XML file
string[] fieldNames =
{
"Name",
"Address",
"SSN"
};
LeadRect[] fieldBounds =
{
new LeadRect(800, 160, 1500, 220),
new LeadRect(800, 560, 1500, 220),
new LeadRect(800, 960, 1500, 220)
};
int fieldCount = fieldNames.Length;
string[] fieldValues = new string[fieldCount];
// Create an instance of the engine
using (IOcrEngine ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.LEAD, false))
{
// Start the engine using default parameters
Console.WriteLine("Starting up the engine...");
ocrEngine.Startup(null, null, null, LEAD_VARS.OcrLEADRuntimeDir);
// Create a page from the image file
Console.WriteLine("Creating a page...");
using (IOcrPage ocrPage = ocrEngine.CreatePage(ocrEngine.RasterCodecsInstance.Load(formFileName, 1), OcrImageSharingMode.AutoDispose))
{
// Get our fields
for (int i = 0; i < fieldCount; i++)
{
// Clear all the zones in the page
ocrPage.Zones.Clear();
// Add our field zone
OcrZone ocrZone = new OcrZone();
ocrZone.ZoneType = OcrZoneType.Text;
ocrZone.Bounds = fieldBounds[i];
ocrZone.Name = fieldNames[i]; // Optional
Console.WriteLine("Adding the zone for field {0} to the page...", ocrZone.Name);
ocrPage.Zones.Add(ocrZone);
// Recognize the page. This will only recognize the zone we added
Console.WriteLine("Recognizing the page...");
ocrPage.Recognize(null);
fieldValues[i] = ocrPage.GetText(0);
}
}
// Shutdown the engine
// Note: calling Dispose will also automatically shutdown the engine if it has been started
Console.WriteLine("Shutting down...");
ocrEngine.Shutdown();
}
// We are done, show the fields
Console.WriteLine("-------------------------------------");
Console.WriteLine("Done, values extracted from the form:");
Console.WriteLine("-------------------------------------");
for (int i = 0; i < fieldCount; i++)
Console.WriteLine("{0} : {1}", fieldNames[i], fieldValues[i]);
}
private string GetMyForm()
{
string formFileName = LEAD_VARS.ImagesDir + "MyForm.tif";
// In this example we will create the form every time
// This will be a TIF file 11 by 8.5 inches in size containing a name, address and social security fields
using (RasterImage image = new RasterImage(
RasterMemoryFlags.Conventional,
2544,
3294,
24,
RasterByteOrder.Bgr,
RasterViewPerspective.BottomLeft,
null,
IntPtr.Zero,
0))
{
image.XResolution = 300;
image.YResolution = 300;
// Draw our fields into this image
IntPtr hdc = RasterImagePainter.CreateLeadDC(image);
try
{
using (Graphics g = Graphics.FromHdc(hdc))
{
g.FillRectangle(Brushes.White, 0, 0, image.ImageWidth - 1, image.ImageHeight - 1);
using (Font f = new Font("Times New Roman", 80, FontStyle.Regular))
{
using (Pen p = new Pen(Color.Black, 4))
{
using (StringFormat sf = new StringFormat())
{
sf.LineAlignment = StringAlignment.Center;
// Draw the fields
// Name
g.DrawString("Name:", f, Brushes.Black, 200, 200);
Rectangle rc = new Rectangle(800, 160, 1500, 220);
g.DrawRectangle(p, rc);
string value = "John Doe";
g.DrawString(value, f, Brushes.Black, rc, sf);
// Address
g.DrawString("Address:", f, Brushes.Black, 200, 600);
rc = new Rectangle(800, 560, 1500, 220);
g.DrawRectangle(p, rc);
value = "1234 Main Street, USA";
g.DrawString(value, f, Brushes.Black, rc, sf);
// Social security number
g.DrawString("SSN:", f, Brushes.Black, 200, 1000);
rc = new Rectangle(800, 960, 1500, 220);
g.DrawRectangle(p, rc);
value = "123-45-6789";
g.DrawString(value, f, Brushes.Black, rc, sf);
}
}
}
}
}
finally
{
RasterImagePainter.DeleteLeadDC(hdc);
}
// Save this image to disk
using (RasterCodecs codecs = new RasterCodecs())
{
codecs.Save(image, formFileName, RasterImageFormat.CcittGroup4, 1);
}
}
return formFileName;
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
public const string OcrLEADRuntimeDir = @"C:\LEADTOOLS 20\Bin\Common\OcrLEADRuntime";
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Ocr
Imports Leadtools.Forms
Imports Leadtools.WinForms
Imports Leadtools.Drawing
Public Sub RecognizeTextExample()
' Get the form file name
Console.WriteLine("Setting up the form...")
Dim formFileName As String = GetMyForm()
' Assume we get the field informations from an external source such as a database or an XML file
Dim fieldNames As String() = {"Name", "Address", "SSN"}
Dim fieldBounds As LeadRect() = {
New LeadRect(800, 160, 1500, 220),
New LeadRect(800, 560, 1500, 220),
New LeadRect(800, 960, 1500, 220)}
Dim fieldCount As Integer = fieldNames.Length
Dim fieldValues As String() = New String(fieldCount - 1) {}
' Create an instance of the engine
Using ocrEngine As IOcrEngine = OcrEngineManager.CreateEngine(OcrEngineType.LEAD, False)
' Start the engine using default parameters
Console.WriteLine("Starting up the engine...")
ocrEngine.Startup(Nothing, Nothing, Nothing, LEAD_VARS.OcrLEADRuntimeDir)
' Create a page from the image file
Console.WriteLine("Creating a page...")
Using ocrPage As IOcrPage = ocrEngine.CreatePage(ocrEngine.RasterCodecsInstance.Load(formFileName, 1), OcrImageSharingMode.AutoDispose)
' Get our fields
For i As Integer = 0 To fieldCount - 1
' Clear all the zones in the page
ocrPage.Zones.Clear()
' Add our field zone
Dim ocrZone As New OcrZone()
ocrZone.ZoneType = OcrZoneType.Text
ocrZone.Bounds = fieldBounds(i)
ocrZone.Name = fieldNames(i)
' Optional
Console.WriteLine("Adding the zone for field {0} to the page...", ocrZone.Name)
ocrPage.Zones.Add(ocrZone)
' Recognize the page. This will only recognize the zone we added
Console.WriteLine("Recognizing the page...")
ocrPage.Recognize(Nothing)
fieldValues(i) = ocrPage.GetText(0)
Next
End Using
' Shutdown the engine
' Note: calling Dispose will also automatically shutdown the engine if it has been started
Console.WriteLine("Shutting down...")
ocrEngine.Shutdown()
End Using
' We are done, show the fields
Console.WriteLine("-------------------------------------")
Console.WriteLine("Done, values extracted from the form:")
Console.WriteLine("-------------------------------------")
For i As Integer = 0 To fieldCount - 1
Console.WriteLine("{0} : {1}", fieldNames(i), fieldValues(i))
Next
End Sub
Private Function GetMyForm() As String
Dim formFileName As String = LEAD_VARS.ImagesDir + "MyForm.tif"
' In this example we will create the form every time
' This will be a TIF file 11 by 8.5 inches in size containing a name, address and social security fields
Using image As New RasterImage(
RasterMemoryFlags.Conventional,
2544, 3294, 24,
RasterByteOrder.Bgr,
RasterViewPerspective.BottomLeft,
Nothing, IntPtr.Zero, 0)
image.XResolution = 300
image.YResolution = 300
' Draw our fields into this image
Dim hdc As IntPtr = RasterImagePainter.CreateLeadDC(image)
Try
Using g As Graphics = Graphics.FromHdc(hdc)
g.FillRectangle(Brushes.White, 0, 0, image.ImageWidth - 1, image.ImageHeight - 1)
Using f As New Font("Times New Roman", 80, FontStyle.Regular)
Using p As New Pen(Color.Black, 4)
Using sf As New StringFormat()
sf.LineAlignment = StringAlignment.Center
' Draw the fields
' Name
g.DrawString("Name:", f, Brushes.Black, 200, 200)
Dim rc As New Rectangle(800, 160, 1500, 220)
g.DrawRectangle(p, rc)
Dim value As String = "John Doe"
g.DrawString(value, f, Brushes.Black, rc, sf)
' Address
g.DrawString("Address:", f, Brushes.Black, 200, 600)
rc = New Rectangle(800, 560, 1500, 220)
g.DrawRectangle(p, rc)
value = "1234 Main Street, USA"
g.DrawString(value, f, Brushes.Black, rc, sf)
' Social security number
g.DrawString("SSN:", f, Brushes.Black, 200, 1000)
rc = New Rectangle(800, 960, 1500, 220)
g.DrawRectangle(p, rc)
value = "123-45-6789"
g.DrawString(value, f, Brushes.Black, rc, sf)
End Using
End Using
End Using
End Using
Finally
RasterImagePainter.DeleteLeadDC(hdc)
End Try
' Save this image to disk
Using codecs As New RasterCodecs()
codecs.Save(image, formFileName, RasterImageFormat.CcittGroup4, 1)
End Using
End Using
Return formFileName
End Function
Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
Public Const OcrLEADRuntimeDir As String = "C:\LEADTOOLS 20\Bin\Common\OcrLEADRuntime"
End Class
GetRecognizedCharacters Method
SetRecognizedCharacters Method
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