private void TesseractErrorReceived(object sender, DataReceivedEventArgs e)
{
string msg = e.Data;
if (string.IsNullOrEmpty(msg) ||
msg.StartsWith("Tesseract Open Source OCR Engine", StringComparison.OrdinalIgnoreCase) ||
msg.Contains("Too few characters", StringComparison.OrdinalIgnoreCase) ||
msg.Contains("Empty page", StringComparison.OrdinalIgnoreCase) ||
msg.Contains(" diacritics", StringComparison.OrdinalIgnoreCase) ||
msg.Contains("Weak margin", StringComparison.OrdinalIgnoreCase))
{
return;
}
if (TesseractErrors.Count <= 100)
{
if (string.IsNullOrEmpty(LastError))
{
LastError = msg;
}
else if (!LastError.Contains(msg))
{
LastError = LastError + Environment.NewLine + msg;
}
TesseractErrors.Add(msg);
}
}
public List <string> Run(string languageCode, string psmMode, string engineMode, List <string> imageFileNames, bool run302 = false)
{
var dir = run302 ? Configuration.Tesseract302Directory : Configuration.TesseractDirectory;
string inputFileName = Path.GetTempPath() + Guid.NewGuid() + ".txt";
var filesToDelete = new List <string>();
var sb = new StringBuilder();
foreach (var imageFileName in imageFileNames)
{
filesToDelete.Add(imageFileName);
sb.AppendLine(imageFileName);
}
File.WriteAllText(inputFileName, sb.ToString());
filesToDelete.Add(inputFileName);
var outputFileName = Path.GetTempPath() + Guid.NewGuid();
using (var process = new Process())
{
process.StartInfo = new ProcessStartInfo(dir + "tesseract.exe")
{
UseShellExecute = true,
Arguments = "\"" + inputFileName + "\" \"" + outputFileName + "\" -l " + languageCode
};
if (!string.IsNullOrEmpty(psmMode))
{
var prefix = run302 ? " -psm " : " --psm ";
process.StartInfo.Arguments += prefix + psmMode;
}
if (!string.IsNullOrEmpty(engineMode) && !run302)
{
process.StartInfo.Arguments += " --oem " + engineMode;
}
process.StartInfo.Arguments += " hocr";
if (_runningOnWindows)
{
if (run302)
{
process.StartInfo.WorkingDirectory = Configuration.Tesseract302Directory;
}
else
{
process.ErrorDataReceived += TesseractErrorReceived;
process.StartInfo.Arguments = " --tessdata-dir \"" + Path.Combine(dir, "tessdata") + "\" " + process.StartInfo.Arguments.Trim();
}
}
else
{
process.StartInfo.UseShellExecute = false;
process.StartInfo.RedirectStandardError = true;
process.StartInfo.FileName = "tesseract";
}
process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
try
{
process.Start();
}
catch (Exception exception)
{
LastError = exception.Message + Environment.NewLine + exception.StackTrace;
TesseractErrors.Add(LastError);
return(new List <string> {
"Error!"
});
}
process.WaitForExit(8000 + imageFileNames.Count * 500);
var result = new List <string>();
string resultFileName = outputFileName + ".html";
if (!File.Exists(outputFileName))
{
resultFileName = outputFileName + ".hocr";
}
filesToDelete.Add(resultFileName);
try
{
if (File.Exists(resultFileName))
{
result = ParseHocr(File.ReadAllText(resultFileName, Encoding.UTF8));
}
foreach (var fileName in filesToDelete)
{
if (File.Exists(fileName))
{
File.Delete(fileName);
}
}
}
catch
{
// ignored
}
return(result);
}
}
public string Run(string languageCode, string psmMode, string engineMode, string imageFileName, bool run302 = false)
{
LastError = null;
var dir = run302 ? Configuration.Tesseract302Directory : Configuration.TesseractDirectory;
string tempTextFileName = Path.GetTempPath() + Guid.NewGuid();
using (var process = new Process())
{
process.StartInfo = new ProcessStartInfo(Path.Combine(dir, "tesseract.exe"))
{
UseShellExecute = true,
Arguments = "\"" + imageFileName + "\" \"" + tempTextFileName + "\" -l " + languageCode
};
if (!string.IsNullOrEmpty(psmMode))
{
var prefix = run302 ? " -psm " : " --psm ";
process.StartInfo.Arguments += prefix + psmMode;
}
if (!string.IsNullOrEmpty(engineMode) && !run302)
{
process.StartInfo.Arguments += " --oem " + engineMode;
}
process.StartInfo.Arguments += " hocr";
if (_runningOnWindows)
{
if (run302)
{
process.StartInfo.WorkingDirectory = Configuration.Tesseract302Directory;
}
else
{
process.ErrorDataReceived += TesseractErrorReceived;
process.StartInfo.Arguments = " --tessdata-dir \"" + Path.Combine(dir, "tessdata") + "\" " + process.StartInfo.Arguments.Trim();
}
}
else
{
process.StartInfo.UseShellExecute = false;
process.StartInfo.RedirectStandardError = true;
process.StartInfo.FileName = "tesseract";
}
process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
try
{
process.Start();
}
catch (Exception exception)
{
LastError = exception.Message + Environment.NewLine + exception.StackTrace;
TesseractErrors.Add(LastError);
return("Error!");
}
process.WaitForExit(8000);
if (process.HasExited && process.ExitCode != 0)
{
LastError = "Tesseract returned with code " + process.ExitCode;
TesseractErrors.Add(LastError);
}
}
string result = string.Empty;
string outputFileName = tempTextFileName + ".html";
if (!File.Exists(outputFileName))
{
outputFileName = tempTextFileName + ".hocr";
}
try
{
if (File.Exists(outputFileName))
{
result = File.ReadAllText(outputFileName, Encoding.UTF8);
result = ParseHocr(result);
File.Delete(outputFileName);
}
File.Delete(imageFileName);
}
catch
{
// ignored
}
return(result);
}
