當操作PDF文件時，通過編程來填充表單域是一種常見的任務。Adobe Acrobat Automation 和Aspose.Pdf for .NET都提供了該功能。本文將通過兩個示例來向你展示Adobe Acrobat Automation 和Aspose.Pdf for .NET填充表單域功能。通過示例，你會發現Aspose.Pdf for .NET在實現填充表單域功能時非常簡單易用，而且你還可以截取下面的代碼片段來幫你實現自己的項目任務。

　　在這個例子中，我們有一個文本字段名為“Name”的PDF文件，打算以“John Doe”值填充到PDF文件中。使用Acrobat Automation，你需要獲取字段名列表，并通過導航列表找到你所需要的字段。一旦在列表中找到該字段，您可以設置新的值。然而，Aspose.Pdf for .NET中的Aspose.Pdf.Facades 命名空間僅使用了一個簡單的FillField方法便為你提供了所有的功能。

Adobe Acrobat Automation

　　下面的代碼展示了如何使用Adobe Acrobat Automation來填充一個PDF表單域。

[C#]

String FORM_NAME = Application.StartupPath + "\\..\\..\\..\\..\\..\\TestFiles\\input.pdf";

// Initialize Acrobat by cretaing App object.

CAcroApp acroApp = new AcroAppClass();

// Show Acrobat Viewer

acroApp.Show();

// Create an AVDoc object

CAcroAVDoc avDoc = new AcroAVDocClass();

// Open the pdf

if(!avDoc.Open (FORM_NAME, ""))

{

string szMsg = "Cannot open" + FORM_NAME + ".\n";

Console.WriteLine(szMsg);

return;

}

// Create a IAFormApp object, so that we can access the form fields in

// the open document

IAFormApp formApp = new AFormAppClass();

// Get the IFields object associated with the form

IFields myFields = (IFields)formApp.Fields;

// Get the IEnumerator object for myFields

IEnumerator myEnumerator = myFields.GetEnumerator();

bool bFound = false;

// Fill the "Name" field with value "John Doe"

while(myEnumerator.MoveNext())

{

// Get the IField object

IField myField = (IField)myEnumerator.Current;

// If the field is "Name", set it's value to "John Doe"

if(myField.Name == "Name")

{

bFound = true;

myField.Value = "John Doe";

break;

}

}

if(bFound)

Console.WriteLine("Sucessfully changed the \"Name\" field value to \"John Doe\".");

else
 Console.WriteLine("Failed to locate the \"Name\" field in the form.");

[VB.NET]

Dim FORM_NAME As String = Application.StartupPath & "\..\..\..\..\..\TestFiles\input.pdf"

' Initialize Acrobat by cretaing App object.

Dim acroApp As CAcroApp = New AcroAppClass()

' Show Acrobat Viewer

acroApp.Show()

' Create an AVDoc object

Dim avDoc As CAcroAVDoc = New AcroAVDocClass()

' Open the pdf

If (Not avDoc.Open (FORM_NAME, "")) Then

Dim szMsg As String = "Cannot open" & FORM_NAME & "." & Constants.vbLf

Console.WriteLine(szMsg)

Return

End If

' Create a IAFormApp object, so that we can access the form fields in

' the open document

Dim formApp As IAFormApp = New AFormAppClass()

' Get the IFields object associated with the form

Dim myFields As IFields = CType(formApp.Fields, IFields)

' Get the IEnumerator object for myFields

Dim myEnumerator As IEnumerator = myFields.GetEnumerator()

Dim bFound As Boolean = False

' Fill the "Name" field with value "John Doe"

Do While myEnumerator.MoveNext()

' Get the IField object

Dim myField As IField = CType(myEnumerator.Current, IField)

' If the field is "Name", set it's value to "John Doe"

If myField.Name = "Name" Then

bFound = True

myField.Value = "John Doe"

Exit Do

End If

Loop

If bFound Then

Console.WriteLine("Sucessfully changed the ""Name"" field value to ""John Doe"".")

Else

Console.WriteLine("Failed to locate the ""Name"" field in the form.")

End If

Aspose.Pdf for .NET

下面的代碼展示了如何使用Aspose.Pdf for .NET來填充PDF表單域。

[C#]

//create Form object and open PDF file

Aspose.Pdf.Facades.Form pdfForm = new Aspose.Pdf.Facades.Form("input.pdf", "output.pdf");

//set the value of the particular field

pdfForm.FillField("Name", "John Doe");

//save the output PDF file

pdfForm.Save();

[VB.NET]

'create Form object and open PDF file

Dim pdfForm As New Aspose.Pdf.Facades.Form("input.pdf", "output.pdf")

'set the value of the particular field

pdfForm.FillField("Name", "John Doe")

'save the output PDF file

pdfForm.Save()

Console.WriteLine("Failed to locate the \"Name\" field in the form.");