public static bool FindTextInPdfFile(string fileFullPath, string text, ref CancellationTokenSource cts)
{
var pdfFocus = new PdfFocus();
try
{
pdfFocus.OpenPdf(fileFullPath);
if (pdfFocus.PageCount > 0)
{
for (var i = 1; i < pdfFocus.PageCount + 1; i++)
{
if (cts.IsCancellationRequested)
{
break;
}
if (pdfFocus.ToText(i, i).IndexOf(text, StringComparison.OrdinalIgnoreCase) >= 0)
{
pdfFocus.ClosePdf();
return(true);
}
}
}
}
catch (Exception)
{
return(false);
}
finally
{
pdfFocus.ClosePdf();
}
return(false);
}
/// <summary>
/// 将PDF文档转换为图片的方法
/// </summary>
/// <param name="pdfInputPath">PDF文件路径</param>
/// <param name="imageOutputPath">图片输出路径</param>
/// <param name="imageName">生成图片的名字</param>
/// <param name="startPageNum">从PDF文档的第几页开始转换</param>
/// <param name="endPageNum">从PDF文档的第几页开始停止转换</param>
/// <param name="imageFormat">设置所需图片格式</param>
/// <param name="definition">设置图片的清晰度，数字越大越清晰</param>
public static void ConvertPDF2Image(string pdfInputPath, string imageOutputPath,
string imageName, int startPageNum, int endPageNum, ImageFormat imageFormat, Definition definition)
{
PdfFocus pdfFocus = new PdfFocus();
pdfFocus.OpenPdf(pdfInputPath);
if (!Directory.Exists(imageOutputPath))
{
Directory.CreateDirectory(imageOutputPath);
}
// validate pageNum
if (startPageNum <= 0)
{
startPageNum = 1;
}
if (endPageNum > pdfFocus.PageCount)
{
endPageNum = pdfFocus.PageCount;
}
if (startPageNum > endPageNum)
{
int tempPageNum = startPageNum;
startPageNum = endPageNum;
endPageNum = startPageNum;
}
// start to convert each page
for (int i = startPageNum; i <= endPageNum; i++)
{
byte[] img = pdfFocus.ToImage(i);
using (FileStream fs1 = File.Create(imageOutputPath + imageName + i.ToString() + "." + imageFormat.ToString()))
{
fs1.Write(img, 0, img.Length);
}
}
pdfFocus.ClosePdf();
}
private static long TimeCutPage(string fileName)
{
SautinSoft.PdfFocus f = new PdfFocus();
long timeFor1 = 0;
long timeFor2 = 0;
f.OpenPdf(fileName);
f.ImageOptions.Dpi = 320;
pages = f.PageCount;
sw.Start();
f.ToImage(prefixFilePath, 1);
sw.Stop();
timeFor1 = sw.ElapsedMilliseconds;
sw.Start();
f.ToImage(prefixFilePath, 2);
sw.Stop();
timeFor2 = sw.ElapsedMilliseconds;
long allTime = timeFor1 + ((timeFor2 - timeFor1) * (f.PageCount - 1));
f.ClosePdf();
timeForJpeg = allTime;
sw.Reset();
return(timeForJpeg);
}
public static void ConvertToImg(string path, ref ProgressBar progressBar, ref double time, ref Label label)
{
//Stopwatch sw = new Stopwatch();
// sw.Start();
SautinSoft.PdfFocus f = new PdfFocus();
f.OpenPdf(path);
int pageCount = f.PageCount;
string prefixFilePath = "PDF\\";
f.ImageOptions.Dpi = 320;
Stopwatch sw = new Stopwatch();
Cutter.setMaximumAndStep(progressBar, f.PageCount * 2);
for (int i = 1; i <= f.PageCount; i++)
{
sw.Start();
f.ToImage(prefixFilePath + i.ToString() + ".jpeg", i);
sw.Stop();
time -= sw.ElapsedMilliseconds;
TimeCalc.MinuteSeconds(time, label);
sw.Reset();
}
f.ClosePdf();
for (int i = 1; i <= pageCount; i++)
{
sw.Start();
Cutter.Cut(prefixFilePath + i.ToString() + ".jpeg", i, progressBar);
sw.Stop();
time -= sw.ElapsedMilliseconds;
TimeCalc.MinuteSeconds(time, label);
sw.Reset();
}
}
public ActionResult <bool> EvaluateStudents([FromBody] List <Evaluation> evaluations)
{
var dao = new EvaluationsDao();
Directory.CreateDirectory(STUDENT_ANS_SHEET_UPLOAD_PATH);
foreach (var e in evaluations)
{
Console.WriteLine("-------------------------------------------------------");
Console.WriteLine($"Student Id {e.Student.Id}");
Console.WriteLine($"DateTime {e.DateTime?.ToString("yyyy-MM-dd")}");
var date = e.DateTime?.ToString("yyyy_MM_dd");
var fileName = $"AnswerKey_Student_{e.Student.Id}_{e.Examination.Course.CourseCode}_{date}.pdf";
var filePath = Path.Combine(STUDENT_ANS_SHEET_UPLOAD_PATH, fileName);
var bytes = Convert.FromBase64String(e.AnswerSheet);
System.IO.File.WriteAllBytes(filePath, bytes);
Console.WriteLine("File Written");
var refSheetName =
e.Examination.ReferenceAnswerSheet.Substring(
e.Examination.ReferenceAnswerSheet.LastIndexOf("/") + 1);
var refSheetPath = Path.Combine(REFERENCE_ANS_SHEET_UPLOAD_PATH, refSheetName);
Console.WriteLine($"Ref Sheet Path = {refSheetPath}");
var studentPdf = new PdfFocus();
Console.WriteLine($"Opening Student Pdf...");
studentPdf.OpenPdf(filePath);
var studentAnsText = studentPdf.ToText();
Console.WriteLine("Student pdf read successfully!");
studentPdf.ClosePdf();
Console.WriteLine("Closing student pdf");
var refPdf = new PdfFocus();
Console.WriteLine("Opening reference pdf");
refPdf.OpenPdf(refSheetPath);
var refAnsText = refPdf.ToText();
Console.WriteLine("Reference pdf read successfully!");
refPdf.ClosePdf();
Console.WriteLine("Closing reference pdf");
paralleldots pd = new paralleldots("AliC73YnPPScR8dJJEMD8qxinhFTTUjFPmJGs5yknY0");
Console.WriteLine("Calculating score");
var similarity = pd.similarity(studentAnsText, refAnsText);
var json = JsonValue.Parse(similarity);
var score = double.Parse(json["normalized_score"].ToString());
Console.WriteLine($"Score = {score}");
var percent = score / 5.0;
Console.WriteLine($"Percentage = {percent}");
e.MarksObtained = (int?)(e.Examination.TotalMarks * percent);
e.AnswerSheet = $"/api/examinations/student-ans-sheet/get/{fileName}";
Console.WriteLine("Writing result to database");
dao.CreateEvaluation(e);
Console.WriteLine("Written Successfully!");
}
return(true);
}