I was able to get this working by copying the files at runtime to location I can access with a common path in both dev and when installed via msix (from the store)
public async Task<bool> CopyTesseractFiles()
{
if (!filesCopied)
{
string directoryName = Path.GetDirectoryName(new Uri(Assembly.GetExecutingAssembly().CodeBase).PathAndQuery);
var localFolder = FileSystem.AppDataDirectory;
var tessdataFolder = System.IO.Path.Combine(localFolder, "tessdata");
System.IO.Directory.CreateDirectory(tessdataFolder);
var tesseractFolder = System.IO.Path.Combine(localFolder, "win-x64");
System.IO.Directory.CreateDirectory(tesseractFolder);
tesseractFolder = System.IO.Path.Combine(tesseractFolder, "native");
System.IO.Directory.CreateDirectory(tesseractFolder);
ShowStatusMessage = true;
if (directoryName.IndexOf("repos") < 0)
{
string path = directoryName.Replace("%20", " ");
var sourceFilePath = Path.Combine(path, "runtimes\\tessdata\\eng.traineddata");
var destinationFilePath = System.IO.Path.Combine(tessdataFolder, "eng.traineddata");
try
{
System.IO.File.Copy(sourceFilePath, destinationFilePath, overwrite: true);
}
catch (Exception ex)
{
StatusMessage = "Error: " + ex.ToString();
await Task.Delay(1);
return false;
}
sourceFilePath = Path.Combine(path, "runtimes\\win-x64\\native\\leptonica-1.80.0.dll");
destinationFilePath = System.IO.Path.Combine(tesseractFolder, "leptonica-1.80.0.dll");
try
{
System.IO.File.Copy(sourceFilePath, destinationFilePath, overwrite: true);
}
catch (Exception ex)
{
StatusMessage = "Error: " + ex.ToString();
await Task.Delay(1);
return false;
}
sourceFilePath = Path.Combine(path, "runtimes\\win-x64\\native\\libSyncFusionTesseract.dll");
destinationFilePath = System.IO.Path.Combine(tesseractFolder, "libSyncFusionTesseract.dll");
try
{
System.IO.File.Copy(sourceFilePath, destinationFilePath, overwrite: true);
}
catch (Exception ex)
{
StatusMessage = "Error: " + ex.ToString();
await Task.Delay(1);
return false;
}
filesCopied = true;
return true;
}
else
{
string path = Path.GetFullPath(Path.Combine(directoryName, "../../../../../"));
var sourceFilePath = Path.Combine(path, "runtimes/tessdata/eng.traineddata");
var destinationFilePath = System.IO.Path.Combine(tessdataFolder, "eng.traineddata");
System.IO.File.Copy(sourceFilePath, destinationFilePath, overwrite: true);
sourceFilePath = Path.Combine(path, "runtimes/win-x64/native/leptonica-1.80.0.dll");
destinationFilePath = System.IO.Path.Combine(tesseractFolder, "leptonica-1.80.0.dll");
System.IO.File.Copy(sourceFilePath, destinationFilePath, overwrite: true);
sourceFilePath = Path.Combine(path, "runtimes/win-x64/native/libSyncFusionTesseract.dll");
destinationFilePath = System.IO.Path.Combine(tesseractFolder, "libSyncFusionTesseract.dll");
System.IO.File.Copy(sourceFilePath, destinationFilePath, overwrite: true);
filesCopied = true;
return true;
}
}
else
{
filesCopied = true;
return true;
}
}
Then to OCR:
private async Task<bool> OCRFile()
{
await Task.Delay(1000);
string path = FileSystem.AppDataDirectory;
try
{
using (OCRProcessor processor = new OCRProcessor())
{
//Assembly assembly = typeof(MainPage).GetTypeInfo().Assembly;
FileStream inputStream = new FileStream(sourcePdfPath, FileMode.Open, FileAccess.Read);
//Load an existing PDF document.
PdfLoadedDocument workingDocument = new PdfLoadedDocument(inputStream);
processor.TessDataPath = Path.Combine(path, @"tessdata\");
processor.TesseractPath = Path.Combine(path, @"win-x64\native\");
//Set OCR language.
processor.Settings.Language = Languages.English;
processor.Settings.PageSegment = PageSegMode.AutoOsd;
processor.Settings.IsImageStraighteningEnabled = true;
//Perform OCR with input document and tessdata (Language packs).
processor.PerformOCR(workingDocument);
//Create file stream.
//Saves the PDF to the memory stream.
using MemoryStream ms = new();
workingDocument.Save(ms);
//Close the PDF document
workingDocument.Close(true);
ms.Position = 0;
// Save the merged PDF to the Cache directory
var fileName = "OCRFile.pdf";
var filePath = Path.Combine(FileSystem.CacheDirectory, fileName);
//PdfViewer.DocumentSource = null;
document.Close(true);
docStream?.Close();
File.WriteAllBytes(filePath, ms.ToArray());
docStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
document = new PdfLoadedDocument(ms.ToArray());
}
return true;
} catch
{
return false;
}
}
