doc pdf ppt与 txt之间的转换 ：

组件的作用一般是将文件读出成字符格式，并不是单纯的转换文件名后缀，所以需要将读出的东西写入txt文件 。

添加office引用

.net中对office中的word及ppt进行编程时，确保安装office时已经安装了word，ppt可编程组件（自定义安装时可查看）或者安装“Microsoft Office 2003 Primary Interop Assemblies”

安装后，在编程页面添加引用：

添加引用-com—microsoft powerpoint object 11.0 libaray/word 11.0 object library;

还得添加office组件

using Microsoft.Office.Interop.Word;

using Microsoft.Office.Interop.PowerPoint;

using org.pdfbox.pdmodel;

using org.pdfbox.util;

using Microsoft.Office.Interop.Word;

using Microsoft.Office.Interop.PowerPoint;

publicvoid pdf2txt(FileInfo file,FileInfo txtfile)

{

PDDocument doc =PDDocument.load(file.FullName);

PDFTextStripper pdfStripper =newPDFTextStripper();

string text = pdfStripper.getText(doc);

StreamWriter swPdfChange =newStreamWriter(txtfile.FullName,false,Encoding.GetEncoding("gb2312"));

swPdfChange.Write(text);

swPdfChange.Close();

}

对于doc文件中的表格，读出的结果是去除掉了网格线，内容按行读取。

Public void word2text(FileInfo file,FileInfo txtfile)

{

object readOnly =true;

object missing = System.Reflection.Missing.Value;

object fileName = file.FullName;

Microsoft.Office.Interop.Word.ApplicationClass wordapp =new Microsoft.Office.Interop.Word.ApplicationClass();

Document doc = wordapp.Documents.Open(ref fileName,

ref missing,ref readOnly,ref missing, ref missing,ref missing,

ref missing,ref missing,ref missing, ref missing,ref missing,

ref missing,ref missing,ref missing, ref missing,ref missing);

string text = doc.Content.Text;

doc.Close(ref missing,ref missing,ref missing);

wordapp.Quit(ref missing,ref missing,ref missing);

StreamWriter swWordChange =new StreamWriter(txtfile.FullName,false,Encoding.GetEncoding("gb2312"));

swWordChange.Write(text);

swWordChange.Close();

}

Public void ppt2txt(FileInfo file, FileInfo txtfile)

{

Microsoft.Office.Interop.PowerPoint.Application pa =new Microsoft.Office.Interop.PowerPoint.ApplicationClass();

Microsoft.Office.Interop.PowerPoint.Presentation pp = pa.Presentations.Open(file.FullName,

Microsoft.Office.Core.MsoTriState.msoTrue,

Microsoft.Office.Core.MsoTriState.msoFalse,

Microsoft.Office.Core.MsoTriState.msoFalse);

string pps ="";

StreamWriter swPPtChange =new StreamWriter(txtfile.FullName,false,Encoding.GetEncoding("gb2312"));

foreach (Microsoft.Office.Interop.PowerPoint.Slide slidein pp.Slides)

{

foreach (Microsoft.Office.Interop.PowerPoint.Shape shapein slide.Shapes)

pps += shape.TextFrame.TextRange.Text.ToString();

}

swPPtChange.Write(pps);

swPPtChange.Close();

}

读取不同类型的文件

Public  StreamReader text2reader(FileInfo file)

{

StreamReader st =null;

switch (file.Extension.ToLower())

{

case".txt":

st = new  StreamReader(file.FullName,Encoding.GetEncoding("gb2312"));

break;

case".doc":

FileInfo wordfile =new  FileInfo(@"E:/my programs/200807program/FileSearch/App_Data/word2txt.txt");//不能使用相对路径，想办法改进

word2text(file, wordfile);

st = newStreamReader(wordfile.FullName,Encoding.GetEncoding("gb2312"));

break;

case".pdf":

FileInfo pdffile =new FileInfo(@"E:/my programs/200807program/FileSearch/App_Data/pdf2txt.txt");

pdf2txt(file, pdffile);

st = new StreamReader(pdffile.FullName,Encoding.GetEncoding("gb2312"));

break;

case".ppt":

FileInfo pptfile =new FileInfo(@"E:/my programs/200807program/FileSearch/App_Data/ppt2txt.txt");

ppt2txt(file,pptfile);

st = new StreamReader(pptfile.FullName,Encoding.GetEncoding("gb2312"));

break;

}

return st;

}

c#读取doc，pdf，ppt，txt文件