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我想搜索一個PDF文件的單詞並將其替換。例如。搜索「錯誤」並替換爲「正確」。 我已經設法使用iText v5.5.9（禮貌http://www.codeguru.com/columns/vb/manipulating-pdf-files-with-itextsharp-and-vb.net-2012.htm）做一個測試程序哪種工作正常（文本被替換似乎在頂部）。 我想知道如果v7 iText會更好/更簡單，如果有人已經做到了/可以提供幫助。 下面是V5測試代碼讀取用的R/W密碼從數據庫的PDF然後用R/W密碼並將其寫入：iText7 .NET搜索/替換
' Based on http://www.codeguru.com/columns/vb/manipulating-pdf-files-with-itextsharp-and-vb.net-2012.htm
Imports System.IO 'Working With Files
Imports System.Text 'Working With Text
Imports System.Data.SqlClient
Imports iTextSharp.text 'Core PDF Text Functionalities
Imports iTextSharp.text.pdf 'PDF Content
Imports iTextSharp.text.pdf.parser 'Content Parser
Imports pdf_clr.LocTextExtraction 'Import LocationTextExtractionStrategy Capabilities
Public Class Class1
Public Shared Sub ReplacePDFText(ByVal strSource As String, ByVal strDest As String, ByVal iDocType As SByte, ByVal strSearch As String, ByVal strReplace As String, ByVal bCase As Boolean)
' strSource is an int
Dim i As Integer
Dim strSqlConnection As String = "context connection=true"
strSqlConnection = "Data Source=SERVER;Initial Catalog=DATABASE;Integrated Security=True"
Dim dbPDF As Byte() = Nothing 'For doc from database
Dim pcbContent As PdfContentByte = Nothing 'Read PDF Content
Dim psStamp As PdfStamper = Nothing 'PDF Stamper Object
Dim strPassword As String = strSource
Using connection As New SqlConnection(strSqlConnection)
connection.Open()
Dim command As New SqlCommand("SELECT pdf FROM docstore WHERE id=" & strSource, connection)
dbPDF = command.ExecuteScalar()
End Using
If IsNothing(dbPDF) <> True Then 'Check if dbPDF filled
'Dim pdfFileReader As New PdfReader(strSource, Encoding.ASCII.GetBytes(strPassword)) 'Read Our File
Dim pdfFileReader As New PdfReader(dbPDF, Encoding.ASCII.GetBytes(strPassword)) 'Read PDF
If strDest.ToString = "" Then
'strDest = System.IO.Path.GetTempPath() & System.IO.Path.GetRandomFileName()
strDest = "C:\tmp\" & System.IO.Path.GetRandomFileName() & ".pdf"
End If
Dim msPDF As New MemoryStream()
psStamp = New PdfStamper(pdfFileReader, msPDF) 'Memorystream as destination
psStamp.Writer.CloseStream = False
' set r/w password to
psStamp.SetEncryption(Nothing, Encoding.ASCII.GetBytes(strPassword), PdfWriter.ALLOW_PRINTING, PdfWriter.DO_NOT_ENCRYPT_METADATA)
For intCurrPage As Integer = 1 To pdfFileReader.NumberOfPages 'Loop Through All Pages
Dim lteStrategy As LocTextExtractionStrategy = New LocTextExtractionStrategy 'Read PDF File Content Blocks
pcbContent = psStamp.GetUnderContent(intCurrPage) 'Look At Current Block
'Determine Spacing of Block To See If It Matches Our Search String
lteStrategy.UndercontentCharacterSpacing = pcbContent.CharacterSpacing
lteStrategy.UndercontentHorizontalScaling = pcbContent.HorizontalScaling
'Trigger The Block Reading Process
Dim currentText As String = PdfTextExtractor.GetTextFromPage(pdfFileReader, intCurrPage, lteStrategy)
Dim scCase As StringComparison = IIf(bCase = 0, StringComparison.CurrentCultureIgnoreCase, StringComparison.CurrentCulture)
'Call
DoSearchReplace(lteStrategy, pcbContent, psStamp, strSearch, strReplace, scCase, "SearchReplaceLayer")
Next 'page
psStamp.Close() 'Close Stamp Destination Object
msPDF.Position = 0
dbPDF = msPDF.ToArray
msPDF.Close()
msPDF.Dispose()
' Write file as check during testing
File.WriteAllBytes(strDest, dbPDF)
If IsNumeric(strSource) And 1 = 1 Then
Using connection As New SqlConnection(strSqlConnection)
Dim cmd As New SqlCommand
cmd.CommandText = "sp_DOCSTORE_ADD_binary" ' updates or inserts into db
' stored procedure parameters as needed
cmd.Parameters.Add("@FILE", Data.SqlDbType.VarBinary) : cmd.Parameters("@FILE").Value = dbPDF
cmd.Parameters.Add("@retvalue", Data.SqlDbType.Int).Direction = Data.ParameterDirection.ReturnValue
cmd.CommandType = Data.CommandType.StoredProcedure
cmd.Connection = connection
connection.Open()
i = cmd.ExecuteNonQuery()
End Using
End If
End If
End Sub
Public Shared Sub DoSearchReplace(ByRef lteStrategy As LocTextExtractionStrategy, ByRef pcbContent As PdfContentByte, ByRef psStamp As PdfStamper, ByVal strSearch As String, ByVal strReplace As String, ByVal scCase As StringComparison, ByVal strLayer As String)
'Determine Match(es)
Dim lstMatches As List(Of iTextSharp.text.Rectangle) = lteStrategy.GetTextLocations(strSearch, scCase)
Dim pdLayer As New PdfLayer(strLayer, psStamp.Writer) 'New layer and enable Overwriting Capabilities
'Set Fill Colour Of Replacing Layer
pcbContent.SetColorFill(BaseColor.WHITE)
For Each rctRect As Rectangle In lstMatches 'Loop Through Each Match
pcbContent.Rectangle(rctRect.Left, rctRect.Bottom, rctRect.Width, rctRect.Height) 'Create New Rectangle For Replacing Layer
pcbContent.Fill() 'Fill With Colour Specified
pcbContent.BeginLayer(pdLayer) 'Create Layer
pcbContent.SetColorFill(BaseColor.DARK_GRAY) 'Fill Layer
pcbContent.Fill() 'Fill Underlying Content
Dim pgState As PdfGState 'Create GState Object
pgState = New PdfGState()
pcbContent.SetGState(pgState) 'Set Current State
pcbContent.SetColorFill(BaseColor.BLACK) 'Fill Letters
pcbContent.BeginText() 'Start Text Replace Procedure
pcbContent.SetTextMatrix(rctRect.Left, rctRect.Bottom) 'Get Text Location
'Set New Font And Size
pcbContent.SetFontAndSize(BaseFont.CreateFont(BaseFont.HELVETICA_OBLIQUE, BaseFont.CP1252, BaseFont.NOT_EMBEDDED), 12)
pcbContent.ShowText(strReplace) 'Replacing Text
pcbContent.EndText() 'Stop Text Replace Procedure
pcbContent.EndLayer() 'Stop Layer replace Procedure
Next 'rectangle
End Sub
乾杯。
你在找VB的解決方案嗎？我可以用C＃表達我的想法... – mkl