无法使用itextsharp找到图像数据或EI

Question

使用itextsharp从PDF文件中提取文本时出现错误“无法找到图像数据或EI”

我已经放置了我的代码和示例文件。请做好必要的事。

                        Dim simg,tmp,sImgPDFLst  As String
                        simg = AOTD_SU_20131118_006.pdf
                        Dim reader As iTextSharp.text.pdf.PdfReader = Nothing 
                        tmp = pdf.parser.PdfTextExtractor.GetTextFromPage(reader, 1, New pdf.parser.SimpleTextExtractionStrategy())
                        If tmp.Length = 0 Then
                              sImgPDFLst = "Following files are IMAGE PDF" 
                        End If
                        reader.Dispose()
                        reader.Close()
                        reader = Nothing

链接：https://drive.google.com/file/d/0B_nzYHWVJJ7KbnFSRWx5ZVNpSkk/edit?usp=sharing