Im using DirectShowLib in C#. I want to use File Writer in C# to set a file output. I want to use File Writer because Graph.SetOutputFileName() wont connect to my encoder, but File Writer will. How can i set the File that File Writer saves to in C#?
I tried pulling up its property pages like in the DxPropPages example but one won't come up for File Writer.
Pulled from here
IBaseFilter ibf = new FileWriter() as IBaseFilter;
Update:
"I know how to add file writer to my
graph in code i just dont know how to
set the file path"
try the following:
FileWriter fileWriter = new FileWriter();
IFileSinkFilter fileSinkFilter = (IFileSinkFilter)fileWriter;
fileSinkFilter.SetFileName(fileOutput, null);
Here a useful link that shows a full running example. the example is demonstrating the use of DES but you should get the general idea from it.
Related
I want to find whether a text is present in the uploaded PDF file in ASP.NET c#.
using (MemoryStream str = new MemoryStream(this.docUploadField.FileBytes))
{
using (StreamReader sr = new StreamReader(str, Encoding.UTF8))
{
string line = sr.ReadToEnd();
}
}
I am getting the below as the file content when I read the contents of file.
Please help me with this
You surely need some PDF reading library.
Most famous being
IText (ITextSharp for who remembers it): https://github.com/itext/itext7-dotnet
PdfSharp: https://github.com/empira/PDFsharp
and many other free options.
With those you open pdf file and read it and take the text you need.
Usually they give you a collection of the PDF elements (paragraphs, images, etc etc, and you loop through them or use a search function to look for what you need)
I am trying to create a pdf file using file stream and while the file is being created in the specified folder of the path, when I try to open the file Adobe Reader is throwing the error that I mentioned above in the title. I am not sure what I am doing wrong but I would greatly appreciate it if someone could look into it and help me out. Thank you!. Here is my code for the filestream:
System.IO.FileStream wFile;
byte[] byteData = null;
byteData = Encoding.ASCII.GetBytes("FileStream Test");
string filePath = $"{_ApplicationPath}PrintedResults\\StreamTest5.pdf";
wFile = new FileStream(filePath, FileMode.Create);
wFile.Write(byteData, 0, byteData.Length);
wFile.Close();
using (var fileStream = new FileStream(filePath, FileMode.Open))
{
Console.WriteLine("This is a test stream file");
}
System.Diagnostics.Process.Start(filePath);
You are writing a text file with the contents "FileStream Test" but naming it with a file extension of ".PDF". This is not a PDF file. It is a text file with a misleading name. Adobe Reader is correctly reporting that it is not a valid PDF.
This is not an answer but I don't have enough reputation to add it as a comment:
You might want to look to 3rd party library offered by http://www.dynamicpdf.com/
Their free evaluation version is quite capable and it is not time limited as they say on their website. With a little more effort you can create quite complicated PDFs with only the evaluation version!
I'm generating a pdf file from a template with iTextSharp, filling each field in this code portion:
PdfReader pdfReader = new PdfReader(templatePath);
try
{
using (FileStream newFileStream = new FileStream(newFilePath, FileMode.Create))
{
using (PdfStamper stamper = new PdfStamper(pdfReader, newFileStream))
{
// fill each field
AcroFields pdfFormFields = stamper.AcroFields;
foreach (KeyValuePair<string, string> entry in content)
{
if (!String.IsNullOrEmpty(entry.Value))
pdfFormFields.SetField(entry.Key, entry.Value);
}
//The below will make sure the fields are not editable in
//the output PDF.
stamper.FormFlattening = true;
stamper.Close();
}
}
}
finally
{
pdfReader.Close();
}
Everything goes fine, file looks ok, but when i try to reopen the file to merge it with some other files I've generated in a unique document i get this error:
2015-11-23 09:46:54,651||ERROR|UrbeWeb|System.IO.IOException: The process cannot access the file 'D:\Sviluppo\communitygov\MaxiAnagrafeImmobiliare\MaxiAnagrafeImmobiliare\cache\IMU\E124\admin\Stampe\Provvedimento_00223850306_2015_11_23_094654.pdf' because it is being used by another process.
Error occurs at this point
foreach (Documento item in docs)
{
string fileName = item.FilePath;
pdfReader = new PdfReader(fileName); // IOException
// some other operations ...
}
Edit: Using Process monitor as suggested I can see there is no close CloseFile operation as I would expect. Can this be the source of the issue?
I've been stuck on this for hours any help is really really appreciated.
Had the same issue with me. This helped a lot.
"You're problem is that you are writing to a file while you are also reading from it. Unlike some file types (JPG, PNG, etc) that "load" all of the data into memory, iTextSharp reads the data as a stream. You either need to use two files and swap them at the end or you can force iTextSharp to "load" the first file by binding your PdfReader to a byte array of the file."
PdfReader reader = new PdfReader(System.IO.File.ReadAllBytes(filePath));
Ref: Cris Haas answer to Cannot access the file because it is being used by another process
I had a similar problem with opening pdf files (for read only) with iTextSharp PdfReader. The first file gave no problem, the second one gave that exception (can not access the file, etc.).
After hours and googling and searching for complicate solutions and twisting my brain, only the simple following code resolved it fully:
iTextSharp_pdf.PdfReader pdfReader = null;
pdfReader = new iTextSharp_pdf.PdfReader(fileName);
I found this great tutorial for loading XML using XLINQ (LINQ to XML).
http://www.codearsenal.net/2012/07/c-sharp-load-xml-using-xlinq.html
It helped me a lot and I got the job done with it.
The only change I made was where he had this line:
from e in XDocument.Load(#"..\..\Employees.xml").Root.Elements("employee")
I write it like this:
from el in XDocument.Load("XML_Files/Employees.xml").Root.Elements("employee")
I had to change the path like this to access a local xml file found right inside my Visual Studio project.
But now I need to save the data back to the file in my project solution. Again, my xml file is located inside my C# project. It's not on the desktop or anything, it is a file added to the project solution.
I can't seem to find any good resources for how to do this task. Does anyone know a good tutorial, or code, a reference to start?
I am inserting a list of objects into the xml files. The objects have basic data type properties, except for one of the object properties, which is a List of doubles.
Can anyone advise a good tutorial or link? Or even a generic code sample?
I'd like to keep this function as basic as possible.
Please help.
------------------ UPDATE ------------------
I actually got this kind of working now. The below code does what I need EXCEPT that it won't write the data to my local file in the Visual Studio project. It will gladly write the data to a test file I created on my desktop, however.
Does anyone know why this is??
//create the serialiser to create the xml
XmlSerializer serialiser = new XmlSerializer(typeof(List<Student>));
// Create the TextWriter for the serialiser to use
TextWriter Filestream = new StreamWriter(#"C:\\Users\\MyName\\Desktop\\output.xml");
//write to the file
serialiser.Serialize(Filestream, employees);
// Close the file
Filestream.Close();
-------- UPDATE ---------
Okay, figured it out.
This code works:
public void WriteXML()
{
//create the serialiser to create the xml
XmlSerializer serialiser = new XmlSerializer(typeof(List<Student>));
// Create the TextWriter for the serialiser to use
TextWriter Filestream = new StreamWriter(#"XML_Files\Employees.xml");
//write to the file
serialiser.Serialize(Filestream, employees);
// Close the file
Filestream.Close();
}
The data is inserted to the xml file, but it does not show in Visual Studio. But when I checked here:
C:\Users\Me\Desktop\MyProject\MyProject\bin\Debug\XML_Files
The file is overwritten.
Also, when I reload the data from the application again, the new entries come up.
The problem is in line:
TextWriter Filestream = new StreamWriter(#"C:\\Users\\MyName\\Desktop\\output.xml");
Change it to one of following:
TextWriter Filestream = new StreamWriter("C:\\Users\\MyName\\Desktop\\output.xml");
TextWriter Filestream = new StreamWriter(#"C:\Users\MyName\Desktop\output.xml");
Simply remove the "#", OR use single slashes:
I am serializing an object with the following code, which uses GZip and Xml:
FileStream fs = new FileStream(destinationfolder + "/myFileName.gz",
FileMode.Create, FileAccess.Write);
using (var gz = new GZipStream(fs, CompressionMode.Compress)) {
var serializer = new XmlSerializer(typeof(MyObjectType));
serializer.Serialize(gz, myObject);
}
That works fine, with one single problem: The user can open the .gz file with 7Zip (after setting the file association), but then he can't just doubleclick the shown xml inside the .gz file, since it doesn't have the .xml extension (although the content is actually there, xml formatted and all).
Question is: "How can I serialize XML to a GZipStream so that the .xml extension is saved with the file, inside the .gz archive?" I'm using .NET 4.0.
Thanks for reading.
I have figure out a simple way to solve that. If this way should be considered a hack or a pragmatic and fine solution, is up to each one, I think.
Simply set the GZip filename to myFileName.xml.gz. This actually makes the inner file appear as myFileName.xml (trimming out the .gz extension as before).
I hope this won't break in the future...