转换图片到pdf代码,VB.Net代码库,德仔网

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【VB.Net】转换图片到pdf
作者:雷霆 / 发布于2015/2/28/ 1636

	Imports System.Drawing
	Imports System.Text
	Imports System.IO
	Imports iTextSharp.text
	Imports iTextSharp.text.pdf

	

	'首先需要引用itextsharp.dll，一个开源dll，直接到官网下载

	

	'此函数主要处理从数据库等地来的图像，接收二进制流

	 Public Function ConvertImageToPDF(ByVal fileBuffer As Byte()) As Byte()

	 Dim pages As New List(Of [String])()
	 Dim result() As Byte
	 Dim image As iTextSharp.text.Image
	 Dim mStream As New MemoryStream()
	 Dim bm As Bitmap
	 Dim ImageStream As New MemoryStream(fileBuffer)
	 Dim pageCount As Integer

	 Dim document As New Document(iTextSharp.text.PageSize.LETTER, 20, 20, 20, 20)
	 'pdf
	 'PdfWriter.GetInstance(document, New FileStream(desPath + name & ".pdf", FileMode.OpenOrCreate))
	 PdfWriter.GetInstance(document, mStream)
	 document.Open()

	
	 Try
	 bm = New Bitmap(ImageStream)
	 pageCount = bm.GetFrameCount(System.Drawing.Imaging.FrameDimension.Page)

	 For i As Integer = 0 To pageCount - 1 '处理多页
	 bm.SelectActiveFrame(System.Drawing.Imaging.FrameDimension.Page, i)

	 image = iTextSharp.text.Image.GetInstance(bm, System.Drawing.Imaging.ImageFormat.Bmp)
	 ''A4
	 'If image.Height > iTextSharp.text.PageSize.A4.Height - 25 Then
	 ' image.ScaleToFit(iTextSharp.text.PageSize.A4.Width - 25, iTextSharp.text.PageSize.A4.Height - 25)
	 'ElseIf image.Width > iTextSharp.text.PageSize.A4.Width - 25 Then
	 ' image.ScaleToFit(iTextSharp.text.PageSize.A4.Width - 25, iTextSharp.text.PageSize.A4.Height - 25)
	 'End If
	 'Letter
	 If image.Height > iTextSharp.text.PageSize.LETTER.Height - 20 Then
	 image.ScaleToFit(iTextSharp.text.PageSize.LETTER.Width - 20, iTextSharp.text.PageSize.LETTER.Height - 20)
	 ElseIf image.Width > iTextSharp.text.PageSize.LETTER.Width - 20 Then
	 image.ScaleToFit(iTextSharp.text.PageSize.LETTER.Width - 20, iTextSharp.text.PageSize.LETTER.Height - 20)
	 End If
	 'center
	 image.Alignment = iTextSharp.text.Image.ALIGN_MIDDLE
	 document.NewPage()
	 document.Add(image)
	 Next
	 Catch ex As Exception

	 End Try

	 Try
	 document.Close()
	 Catch ex As Exception
	 Return Nothing
	 End Try

	 result = mStream.GetBuffer
	 Return result
	 End Function

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	'此函数主要处理来自于硬盘的图像

	 Public Function ConvertImageToPDF(ByVal desPath As String, ByVal name As String) As Byte()
	 Dim ImageStream As FileStream

	 Try
	 ImageStream = New FileStream(desPath & name, FileMode.Open)
	 Catch ex As Exception
	 Return Nothing
	 End Try

	 Dim result(ImageStream.Length) As Byte
	 ImageStream.Read(result, 0, result.Length)
	 ImageStream.Close()

	 result = ConvertImageToPDF(result)

	 Return result
	 End Function

	

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	'使用

	 Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

	 '以将图片读取到二进制流中，模拟从数据库中取数据

	 Dim path As String = "E:/PrintFiles/Image/"
	 Dim name As String = "Customer Collections Detail0065.tif"

	 Dim fileStream As New FileStream(path + name, FileMode.Open)
	 Dim sRdr As New BinaryReader(fileStream)
	 Dim buffer(fileStream.Length) As Byte

	 sRdr.Read(buffer, 0, fileStream.Length)

	

	 '转换图片到PDF

	 Dim Attachment() As Byte = ConvertImageToPDF(buffer)

	 '或者直接 Dim Attachment() As Byte = ConvertImageToPDF(path,name);注意取消上面这一段

	

	 '输出到前端

	 Response.Clear()

	 Response.ContentType = "application/octet-stream"
	 Response.ContentType = "application/pdf"

	 Response.AddHeader("Content-Length", Attachment.GetLength(0).ToString)
	 Response.AddHeader("Content-Disposition", "inline;filename=imageTest.pdf")
	 Response.Filter.Close() 'Close the filter
	 Response.BinaryWrite(Attachment)
	 Response.Flush()

	 Response.End()
	 End Sub
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　图片转pdf　
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