Hello everyone and thanks for your help in advance. I am trying to use iText to merge all Pdf files contained within a directory. Here is my code:
public class MergeFiles
{
public MergeFiles(string targetDirectory) {
string dest = targetDirectory + #"\Merged.pdf";
PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));
PdfMerger merger = new PdfMerger(pdfDoc);
string[] fileEntries = Directory.GetFiles(targetDirectory);
foreach (string fileName in fileEntries) {
//PdfMerger merger = new PdfMerger(pdfDoc);
PdfDocument newDoc = new PdfDocument(new PdfReader(fileName));
merger.Merge(newDoc, 1, newDoc.GetNumberOfPages());
newDoc.Close();
};
pdfDoc.Close();
}
}
This code is resulting in the error "System.IO.IOException: The process cannot access the file 'E:\Merged.pdf' because it is being used by another process." however, I am not sure why. Any help would be appreciated.
After these two lines:
string dest = targetDirectory + #"\Merged.pdf";
PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));
A new (empty) file with name "Merged.pdf" is created in your target directory, with file stream opened in writing mode to write the result of the merging process.
Then, you are getting the list of file in target directory with string[] fileEntries = Directory.GetFiles(targetDirectory);. This array already includes your newly created Merged.pdf file.
Eventually the code tries to merge the resultant file into itself, which obviously fails.
To avoid this error, either collect the files to merge before creating the target document (but make sure there is no existing "Merged.pdf" file in the target directory already):
string[] fileEntries = Directory.GetFiles(targetDirectory);
string dest = targetDirectory + #"\Merged.pdf";
PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));
// The rest of the code
Or, simply remove the target file from fileEntries array manually before merging the files.
Related
I have one CSV file in my PCL folder, i want to get the path of that file so i can read the files using File.ReadAllLine().
Here is the code I have been used not not getting the file, as i have changed the file to the embedded resources
I want this in string[] lines.
string[] lines = File.ReadAllLines("PrinterTestSample.Csv.UserData.csv");
You will need to get a stream from the assembly where the embedded resource is. Below a sample code on how to read it.
// replace App with a class that is in the project where the embedded resource is.
var assembly = typeof(App).GetTypeInfo().Assembly;
// replace App3 with the namespace where your file is
var stream = assembly.GetManifestResourceStream("App3.XMLFile1.xml");
var lines = new List<string>();
using var reader = new StreamReader(stream);
while (reader.ReadLine() is { } line)
{
lines. Add(line);
}
I'm trying to work with text files in the apps folder.
Here's my GoogleApiClient constructor:
googleApiClient = new GoogleApiClient.Builder(this)
.AddApi(DriveClass.API)
.AddScope(DriveClass.ScopeFile)
.AddScope(DriveClass.ScopeAppfolder)
.UseDefaultAccount()
.AddConnectionCallbacks(this)
.EnableAutoManage(this, this)
.Build();
I'm connecting with:
googleApiClient.Connect()
And after:
OnConnected()
I need to list all files inside the app folder. Here's what I got so far:
IDriveFolder appFolder = DriveClass.DriveApi.GetAppFolder(googleApiClient);
IDriveApiMetadataBufferResult result = await appFolder.ListChildrenAsync(googleApiClient);
Which is giving me the files metadata.
But after that, I don't know how to read them, edit them or save new files. They are text files created with my app's previous version (native).
I'm following the google docs for drive but the Xamarin API is a lot different and has no docs or examples. Here's the API I'm using: https://components.xamarin.com/view/googleplayservices-drive
Edit:
Here is an example to read file contents from the guide:
DriveFile file = ...
file.open(mGoogleApiClient, DriveFile.MODE_READ_ONLY, null)
.setResultCallback(contentsOpenedCallback);
First I can't find anywhere in the guide what "DriveFile file = ..." means. How do I get this instance? DriveFile seems to be a static class in this API.
I tried:
IDriveFile file = DriveClass.DriveApi.GetFile(googleApiClient, metadata.DriveId);
This has two problems, first it complains that GetFile is deprecated but doesn't say how to do it properly. Second, the file doesn't have an "open" method.
Any help is appreciated.
The Xamarin binding library wraps the Java Drive library (https://developers.google.com/drive/), so all the guides/examples for the Android-based Drive API work if you keep in mind the Binding's Java to C# transformations:
get/set methods -> properties
fields -> properties
listeners -> events
static nested class -> nested class
inner class -> nested class with an instance constructor
So you can list the AppFolder's directory and files by recursively using the Metadata when the drive item is a folder.
Get Directory/File Tree Example:
await Task.Run(() =>
{
async void GetFolderMetaData(IDriveFolder folder, int depth)
{
var folderMetaData = await folder.ListChildrenAsync(_googleApiClient);
foreach (var driveItem in folderMetaData.MetadataBuffer)
{
Log.Debug(TAG, $"{(driveItem.IsFolder ? "(D)" : "(F)")}:{"".PadLeft(depth, '.')}{driveItem.Title}");
if (driveItem.IsFolder)
GetFolderMetaData(driveItem.DriveId.AsDriveFolder(), depth + 1);
}
}
GetFolderMetaData(DriveClass.DriveApi.GetAppFolder(_googleApiClient), 0);
});
Output:
[SushiHangover.FlightAvionics] (D):AppDataFolder
[SushiHangover.FlightAvionics] (F):.FlightInstrumentationData1.json
[SushiHangover.FlightAvionics] (F):.FlightInstrumentationData2.json
[SushiHangover.FlightAvionics] (F):.FlightInstrumentationData3.json
[SushiHangover.FlightAvionics] (F):AppConfiguration.json
Write a (Text) File Example:
using (var contentResults = await DriveClass.DriveApi.NewDriveContentsAsync(_googleApiClient))
using (var writer = new OutputStreamWriter(contentResults.DriveContents.OutputStream))
using (var changeSet = new MetadataChangeSet.Builder()
.SetTitle("AppConfiguration.txt")
.SetMimeType("text/plain")
.Build())
{
writer.Write("StackOverflow Rocks\n");
writer.Write("StackOverflow Rocks\n");
writer.Close();
await DriveClass.DriveApi.GetAppFolder(_googleApiClient).CreateFileAsync(_googleApiClient, changeSet, contentResults.DriveContents);
}
Note: Substitute a IDriveFolder for DriveClass.DriveApi.GetAppFolder to save a file in a subfolder of the AppFolder.
Read a (text) File Example:
Note: driveItem in the following example is an existing text/plain-based MetaData object that is found by recursing through the Drive contents (see Get Directory/File list above) or via creating a query (Query.Builder) and executing it via DriveClass.DriveApi.QueryAsync.
var fileContexts = new StringBuilder();
using (var results = await driveItem.DriveId.AsDriveFile().OpenAsync(_googleApiClient, DriveFile.ModeReadOnly, null))
using (var inputStream = results.DriveContents.InputStream)
using (var streamReader = new StreamReader(inputStream))
{
while (streamReader.Peek() >= 0)
fileContexts.Append(await streamReader.ReadLineAsync());
}
Log.Debug(TAG, fileContexts.ToString());
I had a PDF document and needed to add a couple of image fields. I imported the pdf file into Adobe LiveCycle as artwork. I then added my 2 images and saved as a static file. When I view the file using Adobe Reader, I can see the images. But when I try to merge the file with other static and dynamic pdf files created using LiveCycle, the images are missing.
I looked at the following thread
Images (imageField) are not shown after iText PDF Merging
but after checking the solution shown there against my code, I am already using PdfCopy instead of PdfWriter:
ByteArrayOutputStream output = new ByteArrayOutputStream();
PdfReader reader = new PdfReader(baosList.get(0).toByteArray());
Document document = new Document(reader.getPageSizeWithRotation(1));
reader.close();
PdfCopy writer = new PdfCopy(document, output);
document.open();
for (ByteArrayOutputStream baos : baosList)
{
// copy content
reader = new PdfReader(baos.toByteArray());
for (int idx = 1; idx <= reader.getNumberOfPages(); idx++)
writer.addPage(writer.getImportedPage(reader, idx));
reader.close();
baos.close();
}
I have other dynamic PDF files with images that are fine. I wonder if my problem is because I imported the original file as artwork.
When the first time my app starts on a windows phone, I want to get some files(xml/images) from project folders and write them to the isolated storage .
How do I detect that my app is running for the first time?
How do I access file in project folders?
Here is another way to read files from your visual studio project. The following shows how to read a txt file but can be used for other file as well. Here the file is in the same directory as the .xaml.cs file.
var res = App.GetResourceStream(new Uri("test.txt", UriKind.Relative));
var txt = new StreamReader(res.Stream).ReadToEnd();
make sure your file is marked as Content.
If you mean project folders as in the folders in your visual studio project, I usually right click on the files and set the build action to 'Embedded Resource'. At runtime, you can read the data from the embedded resource like so:
// The resource name will correspond to the namespace and path in the file system.
// Have a look at the resources collection in the debugger to figure out the name.
string resourcePath = "assembly namespace" + "path inside project";
Assembly assembly = Assembly.GetExecutingAssembly();
string[] resources = assembly .GetManifestResourceNames();
List<string> files = new List<string>();
if (resource.StartsWith(resourcePath))
{
StreamReader reader = new StreamReader(assembly.GetManifestResourceStream(resource), Encoding.Default);
files.Add(reader.ReadToEnd());
}
To read the images you would need something like this to read the stream:
public static byte[] ReadAllBytes(Stream input)
{
byte[] buffer = new byte[32 * 1024];
using (MemoryStream ms = new MemoryStream())
{
int read;
while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
{
ms.Write(buffer, 0, read);
}
return ms.ToArray();
}
}
I am in the process of writing a custom event receiver. The basic flow is as follows:
Document is added to Library
Based on metadata of document, we check to see if a folder within another document library exists.
If the folder does not exist, it is created.
The newly added document is copied to the folder residing in another document library.
I have got myself to the point, where I can copy newly added files, from one document library to another when they are added. However I cannot figure out how to copy to a specific directory (by name) within a document library. Any help would be greatly received.
Here is my code so far:
SPFile sourceFile = properties.ListItem.File;
SPFile destFile; // Copy file from source library to destination
using (Stream stream = sourceFile.OpenBinaryStream())
{
var destLib = (SPDocumentLibrary) properties.ListItem.Web.Lists[listName];
destFile = destLib.RootFolder.Files.Add(sourceFile.Name, stream);
stream.Close();
}
// Update item properties
SPListItem destItem = destFile.Item;
SPListItem sourceItem = sourceFile.Item;
// Copy meta data
destItem["Title"] = sourceItem["Title"];
//...
//... destItem["FieldX"] = sourceItem["FieldX"];
//...
destItem.UpdateOverwriteVersion();
Answer
//Ensure folder here
var destFolder = destLib.RootFolder.SubFolders["name"];
destFile = destFolder.Files.Add(sourceFile.Name, stream);