private List <string> BuildArgs(string inputFilePath, TesseractOptions options)
{
var args = new List <string> {
$"\"{inputFilePath}\""
};
if (options != null)
{
if (options.OutputBasenameFilePath != null)
{
args.Add(options.OutputBasenameFilePath);
}
if (options.DotPerInch != null)
{
args.Add($"--dpi {options.DotPerInch}");
}
if (options.PageSegmentationMode != null)
{
args.Add($"--psm {(int)options.PageSegmentationMode}");
}
if (options.OcrEngineMode != null)
{
args.Add($"--oem {(int)options.OcrEngineMode}");
}
if (options.Languages != null)
{
args.Add("-l " + string.Join("+", options.Languages.Select(l => l.ToName())));
}
if (options.ConfigVars != null)
{
args.Add(string.Join(" ", options.ConfigVars.Select(kv => $"-c {kv.Key}={kv.Value}")));
}
if (options.ConfigFiles != null)
{
args.Add(string.Join(" ", options.ConfigFiles.Select(cf => cf.ToName())));
}
}
return(args);
}
public string PdfToText(byte[] pdfData, TesseractOptions options)
{
string imageFilePath = string.Empty;
try
{
imageFilePath = this.pdfToBitmapConverter.Convert(pdfData);
return(this.FileToText(imageFilePath, options));
}
finally
{
if (!string.IsNullOrWhiteSpace(imageFilePath) && File.Exists(imageFilePath))
{
File.Delete(imageFilePath);
}
}
}
public ProcessResult Process(string inputFilePath, TesseractOptions options)
{
if (!File.Exists(inputFilePath))
{
throw new ArgumentException($"Input file '{inputFilePath}' does not exit.");
}
if (!this.resourcesManager.TryGetDirectory(TesseractData, out var tesseractData))
{
throw new InvalidOperationException($"'{TesseractData}' directory not found.");
}
var cmd = "tesseract";
var args = this.BuildArgs(inputFilePath, options);
var environmentVariables = new List <KeyValuePair <string, string> >
{
new KeyValuePair <string, string>("TESSDATA_PREFIX", tesseractData)
};
return(this.processRunner.RunProcess(cmd, args, environmentVariables: environmentVariables));
}
public string FileToText(string inputFilePath, TesseractOptions options)
{
options.ConfigFiles = new List <ConfigFile> {
ConfigFile.OutputTxt
};
ProcessResult processResult;
try
{
processResult = this.tessaractEngine.Process(inputFilePath, options);
}
catch (Exception ex)
{
throw new TesseractException("Fail to call tesseract", ex);
}
if (processResult.ExitCode != 0)
{
throw new InvalidOperationException(processResult.Error);
}
return(processResult.Output);
}