Can you extract on a wildcard?
I can see that you can when zipping up files? I will not know the name of the files within the zipped folder, however the type will always be .png and there will only ever be one png file.
i.e.
using (var ms = new MemoryStream())
{
var entry = zipout["*.png"];
if (entry != null)
{
entry.Extract(ms);
}
else
{
return;
}
}
using (var zipout = ZipFile.Read(stream))
{
using (var ms = new MemoryStream())
{
foreach (var e in zipout.Where(e => e.FileName.Contains(".png")))
{
e.Extract(ms);
}
}
}
Related
When using PDFsharp (v1.5x) to concatenate multiple PDF files, hyperlinks that exist in the source files are lost.
The links need to be manually recreated in the composite file. Run this method each time you add a new PdfPage object to the target document.
private void FixWebLinkAnnotations(PdfPage page, PdfDocument doc, int docPage)
{
for (var i = 0; i < page.Annotations.Count; i++)
{
var annot = page.Annotations[i];
var subType = annot.Elements.GetString(PdfAnnotation.Keys.Subtype);
if (subType == "/Link")
{
var dest = annot.Elements.GetDictionary(PdfAnnotation.Keys.A);
var rect = annot.Elements.GetRectangle(PdfAnnotation.Keys.Rect);
if (dest != null && rect != null && dest.Elements.Count > 0)
{
var uri = dest.Elements.GetString("/URI");
for (var p = 0; p < doc.PageCount; p++)
{
if (p == docPage && uri != null)
{
doc.Pages[docPage].Annotations.Add(PdfLinkAnnotation.CreateWebLink(rect, uri));
}
}
}
}
}
}
This code was adapted from https://forum.pdfsharp.net/viewtopic.php?f=3&t=3382 to work with hyperlinks rather than document references.
I am trying to read the text from a QRcode image on my mobile app. I am using Xamarin.Forms with ZXing NuGet package.
I have been able to get the file using Xamarin.Essentials FilePicker. But I don't know how to actually read the barcode. I have looked at some stackoverflow solutions and they all seem to be Xamarin.Android based (using BinaryBitmap objects). I need a solution that can work for iOS and UWP as well. Here is what I have so far:
string file = "";
var filePickerOptions = new PickOptions
{
PickerTitle = "Select Barcode Image",
FileTypes = FilePickerFileType.Images
};
var result = await FilePicker.PickAsync(filePickerOptions);
if (result != null)
{
file = result.FullPath;
var res = Decode(file, BarcodeFormat.QR_CODE);
Console.WriteLine(res.Text);
}
public Result Decode(string file, BarcodeFormat? format = null, KeyValuePair<DecodeHintType, object>[] aditionalHints = null)
{
var r = GetReader(format, aditionalHints);
/* I need some function here that will allow me to get the BinaryBitmap from the image file path or something along those lines.*/
var image = GetBinaryBitmap(file);
var result = r.decode(image);
return result;
}
MultiFormatReader GetReader(BarcodeFormat? format, KeyValuePair<DecodeHintType, object>[] aditionalHints)
{
var reader = new MultiFormatReader();
var hints = new Dictionary<DecodeHintType, object>();
if (format.HasValue)
{
hints.Add(DecodeHintType.POSSIBLE_FORMATS, new List<BarcodeFormat>() { format.Value });
}
if (aditionalHints != null)
{
foreach (var ah in aditionalHints)
{
hints.Add(ah.Key, ah.Value);
}
}
reader.Hints = hints;
return reader;
}
https://github.com/Redth/ZXing.Net.Mobile/issues/981. This thread solved it for me. Credit to #jason for this response.
I have implemented the code below, all headers and data are added without any problem. If he wants to block the possibility of editing individual fields or columns in the excel file that is downloaded by the user, then there is a problem, because nothing is blocked
i use for freeze columns/rows, but when i export file and i open file i can edit any fields
worksheet.SheetView.Freeze(1,3);
[HttpGet]
public IActionResult ExportAsExcel()
{
IEnumerable<Employee> employees = this.repo.GetAll<Employee>();
List<EmployeeDTO> employeeDTO = this._mapper.Map<List<EmployeeDTO>>(employees);
using (var workbook = new XLWorkbook())
{
var woorksheet = workbook.Worksheets.Add("Sheet1");
var currentRow = 1;
woorksheet.Cell(currentRow, 1).Value = "ID";
woorksheet.Cell(currentRow, 2).Value = "name";
foreach (var empDtos in employeeDTO)
{
currentRow++;
woorksheet.Cell(currentRow, 1).Value = empDtos.EmployeeId;
woorksheet.Cell(currentRow, 2).Value = empDtos.Name;
}
using (var stream = new MemoryStream())
{
workbook.SaveAs(stream);
var content = stream.ToArray();
return File(
content,
"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
"Employee.xlsx"
);
}
}
}
Whenever I upload a file I want to have it automatically converted into .pdf (I am doing that using NuGet). The thing is the upload scheme is done using relative paths. I do not know what to put into these parentheses:
var wordDocument = appWord.Documents.Open(uploadedFile);
What should I replace uploadedFile with in order to work? I will leave my relative path mapping code below:
public IActionResult Index1()
{
// Get files from the server
var model = new FilesViewModel();
foreach (var item in Directory.GetFiles(Path.Combine(Directory.GetCurrentDirectory(), "upload")))
{
model.Files.Add(
new FileDetails { Name = System.IO.Path.GetFileName(item), Path = item });
}
return View(model);
}
[HttpPost]
public IActionResult Index1(IFormFile[] files)
{
// Iterate each files
foreach (var file in files)
{
// Get the file name from the browser
var fileName = System.IO.Path.GetFileName(file.FileName);
// Get file path to be uploaded
var filePath = Path.Combine(Directory.GetCurrentDirectory(), "upload", fileName);
// Check If file with same name exists and delete it
if (System.IO.File.Exists(filePath))
{
System.IO.File.Delete(filePath);
}
// Create a new local file and copy contents of uploaded file
using (var localFile = System.IO.File.OpenWrite(filePath))
using (var uploadedFile = file.OpenReadStream())
{
var appWord = new Application();
if (appWord.Documents != null)
{
//yourDoc is your word document
var wordDocument = appWord.Documents.Open(uploadedFile);
string pdfDocName = "pdfDocument.pdf";
if (wordDocument != null)
{
wordDocument.ExportAsFixedFormat(pdfDocName,
WdExportFormat.wdExportFormatPDF);
wordDocument.Close();
}
appWord.Quit();
}
uploadedFile.CopyTo(localFile);
}
}
ViewBag.Message = "Files are successfully uploaded";
// Get files from the server
var model = new FilesViewModel();
foreach (var item in Directory.GetFiles(Path.Combine(Directory.GetCurrentDirectory(), "upload")))
{
model.Files.Add(
new FileDetails { Name = System.IO.Path.GetFileName(item), Path = item });
}
return View(model);
}
public async Task<IActionResult> Download(string filename)
{
if (filename == null)
return Content("filename is not availble");
var path = Path.Combine(Directory.GetCurrentDirectory(), "upload", filename);
var memory = new MemoryStream();
using (var stream = new FileStream(path, FileMode.Open))
{
await stream.CopyToAsync(memory);
}
memory.Position = 0;
return File(memory, GetContentType(path), Path.GetFileName(path));
}
private string GetContentType(string path)
{
var types = GetMimeTypes();
var ext = Path.GetExtension(path).ToLowerInvariant();
return types[ext];
}
private Dictionary<string, string> GetMimeTypes()
{
return new Dictionary<string, string>
{
{".txt", "text/plain"},
{".pdf", "application/pdf"},
{".doc", "application/vnd.ms-word"},
{".docx", "application/vnd.ms-word"},
{".xls", "application/vnd.ms-excel"},
{".xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"},
{".png", "image/png"},
{".jpg", "image/jpeg"},
{".jpeg", "image/jpeg"},
{".gif", "image/gif"},
{".csv", "text/csv"}
};
}
I need to display mht file stored in zip archive in frame on the page
<iframe src="#Url.Action("LoadInstrucion","Pharmacy", new {id= Model.Instrukciya })"></iframe>
Action in MVC Controller returning file
public ActionResult LoadInstrucion(string id)
{
var bytes = InstructionsLoader.LoadInstrucion(id);
return File(bytes, "multipart/related");
}
Action for getting byte array from file
public static byte[] LoadInstrucion(string zipFileName)
{
string zipfilePath = $#"{HttpContext.Current.Request.PhysicalApplicationPath}Content\inst\{zipFileName}.zip";
if (File.Exists(zipfilePath))
{
using (var zipStream = new FileStream(zipfilePath, FileMode.Open))
using (var archive = new ZipArchive(zipStream, ZipArchiveMode.Read))
{
if (archive.Entries.Count > 0)
{
var file = archive.Entries[0];
var stream = file.Open();
using (var ms = new MemoryStream())
{
stream.CopyTo(ms);
return ms.ToArray();
}
}
}
}
return new byte[0];
}
If I navigate to Url I see the requested mht file, but it is not displayed in iframe. In Dev console I get warning:
Attempted to load a multipart archive into an subframe