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Watermark is a recognizable text or image that appears under document text. A watermark is useful in the examination of paper because it can be widely used for trademarks, locations and so on. This article aims at introducing how to add PDF text watermark for WPF through a simple WPF PDF API Spire.PDF for WPF. Also it can implement PDF watermark by image.
First we need to complete the preparatory work:
- Download the latest Spire.PDF and install it on your machine.
- Add the Spire.PDF.WPF.dll files as reference.
- Open bin folder and select the three dll files under .NET 4.0.
- Right click property and select properties in its menu.
- Set the target framework as .NET 4.
- Add Spire.PDF as namespace.
Here comes to the explanation of the code.
Step 1: Create an instance of Spire.PDF.Document
[C#]
PdfDocument doc = new PdfDocument();
Step 2: Load the file base on a specified file path
[C#]
doc.LoadFromFile(@"..\..\Sample1.pdf");
Step 3: Add the text watermark to the first page
[C#]
PdfPageBase page = doc.Pages[0];
PdfTilingBrush brush = new PdfTilingBrush(new SizeF(page.Canvas.ClientSize.Width/2, page.Canvas.ClientSize.Height/3));
brush.Graphics.SetTransparency(0.3f);
brush.Graphics.Save();
brush.Graphics.TranslateTransform(brush.Size.Width / 2, brush.Size.Height / 2);
brush.Graphics.RotateTransform(-45);
brush.Graphics.DrawString("Spire.Pdf Demo",new PdfFont(PdfFontFamily.Helvetica, 24), PdfBrushes.Violet, 0, 0,new PdfStringFormat(PdfTextAlignment.Center));
brush.Graphics.Restore();
brush.Graphics.SetTransparency(1);
page.Canvas.DrawRectangle(brush, new RectangleF(new PointF(0, 0), page.Canvas.ClientSize));
Step 4: Save the PDF file
[C#]
doc.SaveToFile("TextWaterMark.pdf");
Full code:
[C#]
private void button1_Click(object sender, RoutedEventArgs e)
{
PdfDocument doc = new PdfDocument();
doc.LoadFromFile(@"..\..\Sample1.pdf");
PdfPageBase page = doc.Pages[0];
PdfTilingBrush brush = new PdfTilingBrush(new SizeF(page.Canvas.ClientSize.Width/2, page.Canvas.ClientSize.Height/3));
brush.Graphics.SetTransparency(0.3f);
brush.Graphics.Save();
brush.Graphics.TranslateTransform(brush.Size.Width / 2, brush.Size.Height / 2);
brush.Graphics.RotateTransform(-45);
brush.Graphics.DrawString("Spire.Pdf Demo",new PdfFont(PdfFontFamily.Helvetica, 24), PdfBrushes.Violet, 0, 0, new PdfStringFormat(PdfTextAlignment.Center));
brush.Graphics.Restore();
brush.Graphics.SetTransparency(1);
page.Canvas.DrawRectangle(brush, new RectangleF(new PointF(0, 0), page.Canvas.ClientSize));
doc.SaveToFile("TextWaterMark.pdf");
}
Effect screenshot:
Published in
Program Guide WPF
Tagged under
We have already demonstrated how to create form fields in PDF file. This article mainly shows you how developers fill form field in PDF in C# only with 3 simple steps by using a standalone .NET PDF component Spire.PDF.
Make sure Spire.PDF for .NET has been installed correctly and then add Spire.Pdf.dll as reference in the downloaded Bin folder though the below path: "..\Spire.Pdf\Bin\NET4.0\ Spire.Pdf.dll". Here comes to the details of how developers Fill Form Fields by using Spire.PDF:
Step 1: Open the form that needs to fill the data
[C#]
//Create a pdf document PdfDocument doc = new PdfDocument(); //Load from file doc.LoadFromFile(@"..\..\FormField.pdf");
Step 2: Update the data to the form
[C#]
//Get form
PdfFormWidget formWidget = doc.Form as PdfFormWidget;
for (int i = 0; i < formWidget.FieldsWidget.List.Count; i++)
{
PdfField field = formWidget.FieldsWidget.List[i] as PdfField;
//Fill the data for textBoxField
if (field is PdfTextBoxFieldWidget)
{
PdfTextBoxFieldWidget textBoxField = field as PdfTextBoxFieldWidget;
switch (textBoxField.Name)
{
case "email":
textBoxField.Text = "support@e-iceblue.com";
break;
case "password":
textBoxField.Password = true;
textBoxField.Text = "e-iceblue";
//Fill the data for listBoxField
if (field is PdfListBoxWidgetFieldWidget)
{
PdfListBoxWidgetFieldWidget listBoxField = field as PdfListBoxWidgetFieldWidget;
switch (listBoxField.Name)
{
case "email_format":
int[] index = { 1 };
listBoxField.SelectedIndex = index;
break;
//Fill the data for comBoxField
if (field is PdfComboBoxWidgetFieldWidget)
{
PdfComboBoxWidgetFieldWidget comBoxField = field as PdfComboBoxWidgetFieldWidget;
switch (comBoxField.Name)
{
case "title":
int[] items = { 0 };
comBoxField.SelectedIndex = items;
break;
//Fill the data for checkBoxField
if (field is PdfCheckBoxWidgetFieldWidget)
{
PdfCheckBoxWidgetFieldWidget checkBoxField = field as PdfCheckBoxWidgetFieldWidget;
switch (checkBoxField.Name)
{
case "agreement_of_terms":
checkBoxField.Checked = true;
break;
Step 3: Save and launch file
[C#]
//Save the document to file in PDF format doc.SaveToFile(@"../../FormFieldData.pdf.pdf"); //Launch the file System.Diagnostics.Process.Start(@"../../FormFieldData.pdf.pdf");
Effective Screenshot:
The original PDF with form fields:
After fill the form fields:
View the full code as below:
C#
using Spire.Pdf;
using Spire.Pdf.Fields;
using Spire.Pdf.Widget;
namespace FillFormFields
{
class Program
{
static void Main(string []args){
PdfDocument doc = new PdfDocument();
doc.LoadFromFile(@"..\..\FormField.pdf");
PdfFormWidget formWidget = doc.Form as PdfFormWidget;
for (int i = 0; i < formWidget.FieldsWidget.List.Count; i++)
{
PdfField field = formWidget.FieldsWidget.List[i] as PdfField;
if (field is PdfTextBoxFieldWidget)
{
PdfTextBoxFieldWidget textBoxField = field as PdfTextBoxFieldWidget;
switch (textBoxField.Name)
{
case "email":
textBoxField.Text = "support@e-iceblue.com";
break;
case "username":
textBoxField.Text = "E-iceblue";
break;
case "password":
textBoxField.Password = true;
textBoxField.Text = "e-iceblue";
break;
case "password2":
textBoxField.Password = true;
textBoxField.Text = "e-iceblue";
break;
case "company_name ":
textBoxField.Text = "E-iceblue";
break;
case "first_name":
textBoxField.Text = "James";
break;
case "last_name":
textBoxField.Text = "Chen";
break;
case "middle_name":
textBoxField.Text = "J";
break;
case "address1":
textBoxField.Text = "Chengdu";
break;
case "address2":
textBoxField.Text = "Beijing";
break;
case "city":
textBoxField.Text = "Shanghai";
break;
case "postal_code":
textBoxField.Text = "11111";
break;
case "state":
textBoxField.Text = "Shanghai";
break;
case "phone":
textBoxField.Text = "1234567901";
break;
case "mobile_phone":
textBoxField.Text = "123456789";
break;
case "fax":
textBoxField.Text = "12121212";
break;
}
}
if (field is PdfListBoxWidgetFieldWidget)
{
PdfListBoxWidgetFieldWidget listBoxField = field as PdfListBoxWidgetFieldWidget;
switch (listBoxField.Name)
{
case "email_format":
int[] index = { 1 };
listBoxField.SelectedIndex = index;
break;
}
}
if (field is PdfComboBoxWidgetFieldWidget)
{
PdfComboBoxWidgetFieldWidget comBoxField = field as PdfComboBoxWidgetFieldWidget;
switch (comBoxField.Name)
{
case "title":
int[] items = { 0 };
comBoxField.SelectedIndex = items;
break;
}
}
if (field is PdfRadioButtonListFieldWidget)
{
PdfRadioButtonListFieldWidget radioBtnField = field as PdfRadioButtonListFieldWidget;
switch (radioBtnField.Name)
{
case "country":
radioBtnField.SelectedIndex = 1;
break;
}
}
if (field is PdfCheckBoxWidgetFieldWidget)
{
PdfCheckBoxWidgetFieldWidget checkBoxField = field as PdfCheckBoxWidgetFieldWidget;
switch (checkBoxField.Name)
{
case "agreement_of_terms":
checkBoxField.Checked = true;
break;
}
}
if (field is PdfButtonWidgetFieldWidget)
{
PdfButtonWidgetFieldWidget btnField = field as PdfButtonWidgetFieldWidget;
switch (btnField.Name)
{
case "submit":
btnField.Text = "Submit";
break;
}
}
}
doc.SaveToFile(@"../../FormFieldData.pdf.pdf");
System.Diagnostics.Process.Start(@"../../FormFieldData.pdf.pdf");
}
}
}
VB.NET
Imports Spire.Pdf
Imports Spire.Pdf.Fields
Imports Spire.Pdf.Widget
Namespace FillFormFields
Class Program
Private Shared Sub Main(args As String())
Dim doc As New PdfDocument()
doc.LoadFromFile("..\..\FormField.pdf")
Dim formWidget As PdfFormWidget = TryCast(doc.Form, PdfFormWidget)
For i As Integer = 0 To formWidget.FieldsWidget.List.Count - 1
Dim field As PdfField = TryCast(formWidget.FieldsWidget.List(i), PdfField)
If TypeOf field Is PdfTextBoxFieldWidget Then
Dim textBoxField As PdfTextBoxFieldWidget = TryCast(field, PdfTextBoxFieldWidget)
Select Case textBoxField.Name
Case "email"
textBoxField.Text = "support@e-iceblue.com"
Exit Select
Case "username"
textBoxField.Text = "E-iceblue"
Exit Select
Case "password"
textBoxField.Password = True
textBoxField.Text = "e-iceblue"
Exit Select
Case "password2"
textBoxField.Password = True
textBoxField.Text = "e-iceblue"
Exit Select
Case "company_name "
textBoxField.Text = "E-iceblue"
Exit Select
Case "first_name"
textBoxField.Text = "James"
Exit Select
Case "last_name"
textBoxField.Text = "Chen"
Exit Select
Case "middle_name"
textBoxField.Text = "J"
Exit Select
Case "address1"
textBoxField.Text = "Chengdu"
Exit Select
Case "address2"
textBoxField.Text = "Beijing"
Exit Select
Case "city"
textBoxField.Text = "Shanghai"
Exit Select
Case "postal_code"
textBoxField.Text = "11111"
Exit Select
Case "state"
textBoxField.Text = "Shanghai"
Exit Select
Case "phone"
textBoxField.Text = "1234567901"
Exit Select
Case "mobile_phone"
textBoxField.Text = "123456789"
Exit Select
Case "fax"
textBoxField.Text = "12121212"
Exit Select
End Select
End If
If TypeOf field Is PdfListBoxWidgetFieldWidget Then
Dim listBoxField As PdfListBoxWidgetFieldWidget = TryCast(field, PdfListBoxWidgetFieldWidget)
Select Case listBoxField.Name
Case "email_format"
Dim index As Integer() = {1}
listBoxField.SelectedIndex = index
Exit Select
End Select
End If
If TypeOf field Is PdfComboBoxWidgetFieldWidget Then
Dim comBoxField As PdfComboBoxWidgetFieldWidget = TryCast(field, PdfComboBoxWidgetFieldWidget)
Select Case comBoxField.Name
Case "title"
Dim items As Integer() = {0}
comBoxField.SelectedIndex = items
Exit Select
End Select
End If
If TypeOf field Is PdfRadioButtonListFieldWidget Then
Dim radioBtnField As PdfRadioButtonListFieldWidget = TryCast(field, PdfRadioButtonListFieldWidget)
Select Case radioBtnField.Name
Case "country"
radioBtnField.SelectedIndex = 1
Exit Select
End Select
End If
If TypeOf field Is PdfCheckBoxWidgetFieldWidget Then
Dim checkBoxField As PdfCheckBoxWidgetFieldWidget = TryCast(field, PdfCheckBoxWidgetFieldWidget)
Select Case checkBoxField.Name
Case "agreement_of_terms"
checkBoxField.Checked = True
Exit Select
End Select
End If
If TypeOf field Is PdfButtonWidgetFieldWidget Then
Dim btnField As PdfButtonWidgetFieldWidget = TryCast(field, PdfButtonWidgetFieldWidget)
Select Case btnField.Name
Case "submit"
btnField.Text = "Submit"
Exit Select
End Select
End If
Next
doc.SaveToFile("../../FormFieldData.pdf.pdf")
System.Diagnostics.Process.Start("../../FormFieldData.pdf.pdf")
End Sub
End Class
End Namespace
Published in
Form Field
Tagged under
PDF supports actions. And Spire.PDF, a very powerful .NET component enables developers to add action chain to PDF file. Action chain means an action get executed automatically after another one.
In this article, a solution is introduced to add action chain to PDF file.
Step 1: Set the action that gets performed right after PDF document is opened
[C#]
String script
= "app.alert({"
+ " cMsg: \"I'll lead; you must follow me.\","
+ " nIcon: 3,"
+ " cTitle: \"JavaScript Action\""
+ "});";
PdfJavaScriptAction action1 = new PdfJavaScriptAction(script);
document.AfterOpenAction = action1;
Spire.PDF provides you a class called PdfJavaScriptAction that executes JavaScript code. Create a PdfJavaScriptAction instance “action1” using JavaScript code. And set the property AfterOpenAction of “document” to action1.
Step 2: Set the action that gets performed after “action1” using the property NextAction
[C#]
script
= "app.alert({"
+ " cMsg: \"The firt page!\","
+ " nIcon: 3,"
+ " cTitle: \"JavaScript Action\""
+ "});";
PdfJavaScriptAction action2 = new PdfJavaScriptAction(script);
action1.NextAction = action2;
Step 3: Set the action that gets performed after “action2”
[C#]
PdfDestination dest = new PdfDestination(pagetwo); dest.Zoom = 1; PdfGoToAction action3 = new PdfGoToAction(dest); action2.NextAction = action3;
PdfDestination can mark a specified page or location in PDF. Create a PdfDestination instance “dest” using “pagetwo”. Then create a PdfGoToAction instance “action3” using “dest”.
Step 4: Set the action that gets performed after “action3”
[C#]
script
= "app.alert({"
+ " cMsg: \"Oh sorry, it's the last page. I'm missing!\","
+ " nIcon: 3,"
+ " cTitle: \"JavaScript Action\""
+ "});";
PdfJavaScriptAction action4 = new PdfJavaScriptAction(script);
action3.NextAction = action4;
Step 5: Save the file
[C#]
document.SaveToFile("result.pdf");
Full code:
[C#]
using Spire.Pdf;
using Spire.Pdf.Actions;
using Spire.Pdf.General;
using Spire.Pdf.Graphics;
using System;
using System.Drawing;
namespace AddActionChain
{
class Program
{
static void Main(string[] args)
{
PdfDocument document = new PdfDocument();
PdfPageBase pageone = document.Pages.Add();
pageone.Canvas.DrawString("This is Page One.",
new PdfFont(PdfFontFamily.Helvetica, 20f),
new PdfSolidBrush(Color.Black),
10, 10);
PdfPageBase pagetwo = document.Pages.Add();
pagetwo.Canvas.DrawString("This is Page Two.",
new PdfFont(PdfFontFamily.Helvetica, 20f),
new PdfSolidBrush(Color.Black),
10, 10);
String script
= "app.alert({"
+ " cMsg: \"I'll lead; you must follow me.\","
+ " nIcon: 3,"
+ " cTitle: \"JavaScript Action\""
+ "});";
PdfJavaScriptAction action1 = new PdfJavaScriptAction(script);
document.AfterOpenAction = action1;
script
= "app.alert({"
+ " cMsg: \"The first page!\","
+ " nIcon: 3,"
+ " cTitle: \"JavaScript Action\""
+ "});";
PdfJavaScriptAction action2 = new PdfJavaScriptAction(script);
action1.NextAction = action2;
PdfDestination dest = new PdfDestination(pagetwo);
dest.Zoom = 1;
PdfGoToAction action3 = new PdfGoToAction(dest);
action2.NextAction = action3;
script
= "app.alert({"
+ " cMsg: \"Oh sorry, it's the last page. I'm missing!\","
+ " nIcon: 3,"
+ " cTitle: \"JavaScript Action\""
+ "});";
PdfJavaScriptAction action4 = new PdfJavaScriptAction(script);
action3.NextAction = action4;
document.SaveToFile("result.pdf");
System.Diagnostics.Process.Start("result.pdf");
}
}
}
Screenshot:
Published in
Action
Tagged under
