I am creating an XmlDoc in C# and using Newtonsoft to serialize to JSON. It works, but I am getting a bunch of what appear to be "NUL"'s at the end of the JSON. No idea why. Anyone seen this before?
CODE:
XmlDocument xmlDoc = BuildTranslationXML(allTrans, applicationName, language);
// Convert the xml doc to json
// the conversion inserts \" instead of using a single quote, so we need to replace it
string charToReplace = "\"";
string jsonText = JsonConvert.SerializeXmlNode(xmlDoc);
// json to a stream
MemoryStream memoryStream = new MemoryStream();
TextWriter tw = new StreamWriter(memoryStream);
tw.Write(jsonText);
tw.Flush();
tw.Close();
// output the stream as a file
string fileName = string.Format("{0}_{1}.json", applicationName, language);
return File(memoryStream.GetBuffer(), "text/json", fileName);
The file is served up to the calling web page and the browser prompts the user to save the file. When opening the file, it displays the correct JSON but also has all the trailing nulls. See image below (hopefully the stackoverflow link works):
file screenshot
The GetBuffer() method returns the internal representation of the MemoryStream. Use ToArray() instead to get just the part of that internal array that has data Newtonsoft has put in there.
Related
I am new to groovy and to this forum.
I am using a middleware tool(SAP CPI) where I am getting a pdf in base64 string format. I need to send the pdf to another system.
This is what I did:
Store the Base64 input in a string.
Pass it through a Base64 Decoder(this is an inbuilt function)
Use below code and pass the base64 string as an input to "body":
import com.sap.gateway.ip.core.customdev.util.Message;
import java.util.HashMap;
def Message processData(Message message){
def body = message.getBody(String.class);
ByteArrayOutputStream outputStream = new ByteArrayOutputStream()
outputStream.write(body.getBytes())
message.setBody(outputStream.toString())
return message;
}
what I get as an output looks something like below:
%PDF-1.7
%????
5 0 obj
<</Type/Font/Subtype/Type1/BaseFont/Helvetica/Encoding/WinAnsiEncoding>>
endobj
14 0 obj
<</Title(T....
and so on..
Now when I save this output as a pdf file, it is either blank or it says "There was an error opening this document. The file is damaged and could not be repaired."
What am I doing wrong? Thanks in advance!
Note: Due to limitation of the middleware, I cannot create a whole project, but will rather have to use processData() function and can manipulate the string inside it. Thanks!
I created a pdf document using the code looks like the following:
// The text parameter equels 'שדג' it is Hebrew. unicode equivalent is '\u05E9\u05D3\u05D2'
private static void createSimplePdf(String filename, String text) throws Exception {
final String path = RunItextApp.class.getResource("/Arial.ttf").getPath();
final PdfFont font = PdfFontFactory.createFont(path, PdfEncodings.IDENTITY_H);
Style hebrewStyle = new Style()
.setBaseDirection(BaseDirection.RIGHT_TO_LEFT)
.setFontSize(14)
.setFont(font);
final PdfWriter pdfWriter = new PdfWriter(filename);
final PdfDocument pdfDocument = new PdfDocument(pdfWriter);
final Document pdf = new Document(pdfDocument);
pdf.add(
new Paragraph(text)
.setFontScript(Character.UnicodeScript.HEBREW)
.addStyle(hebrewStyle)
);
pdf.close();
System.out.println("The document '" + filename + "' has been created.");
}
and after that, I tried to open this document using pdfbox util and I got the following data:
but I got an unexpected result in the Contents:stream section especially Tj tag. I expected string like the following 05E905D305D2 but I got 02b902a302a2. I tried to convert this hex string to normal string and I got the following result: ʹʣʢ but I expected that string שדג.
What do I wrong? Hot to convert this 02b902a302a2 string and get שדג?
This answer writes in a comment #usr2564301. Thanks for the help!
The numbers you get are not Unicode characters but font indexes instead. (Check how the font is embedded!) The text in a PDF does not specifically care about Unicode – it may or may not be this. Good PDF creators add a /ToUnicode table to help decoding, but it's optional.
I have a filename pointing to a text file, including its path, as a string. Now I'd like to load this .csv file into memory stream. How should I do that?
For example, I have this:
Dim filename as string="C:\Users\Desktop\abc.csv"
Dim stream As New MemoryStream(File.ReadAllBytes(filename))
You don't need to load a file into a MemoryStream.
You can simply call File.OpenRead to get a FileStream containing the file.
If you really want the file to be in a MemoryStream, you can call CopyTo to copy the FileStream to a MemoryStream.
I had an XML file being read from disk, using the old XmlReader API. How to read the XML file into memory, and then work with it in memory, instead of reading the disk repeatedly? Based on VB answer from Centro (upvoted) but with a Using block, and in C#.
The key line:
MemoryStream myXMLDocument = new MemoryStream(File.ReadAllBytes(#"c:\temp\myDemoXMLDocument.xml"));
Re the OP's question, if you wanted to load a CSV file into a MemoryStream:
MemoryStream myCSVDataInMemory = new MemoryStream(File.ReadAllBytes(#"C:\Users\Desktop\abc.csv"));
Following is a code snippet showing code to reads through XML document now that it's in a MemoryStream. Basically the same code as when it was coming from a FileStream that pointed to a file on disk. Yes, the XMLTextReader API is old and clunky, but it's what I had to work with in this app.
string myXMLFileName = #"c:\temp\myDemoXMLDocument.xml";
using (MemoryStream myXMLDocument = new MemoryStream(File.ReadAllBytes(myXMLFileName)))
{
myXMLTextReader = new XmlTextReader(myXMLDocument);
myXMLTextReader.WhitespaceHandling = WhitespaceHandling.None;
myXmlTextReader.Read(); // read the XML declaration node, advance to <Batch> tag
while (!myXmlTextReader.EOF)
{
if (myXmlTextReader.Name == "xml" && !myXmlTextReader.IsStartElement()) break;
// advance to <Batch> tag
while (myXmlTextReader.Name == "Batch" && myXmlTextReader.IsStartElement())
{
string BatchIdentifier = myXmlTextReader.GetAttribute("BatchIdentifier");
myXmlTextReader.Read(); // advance to next tag
while (!myXmlTextReader.EOF)
{
if (myXmlTextReader.Name == "Transaction" && myXmlTextReader.IsStartElement())
{
// Start a new set of items
string transactionID = myXmlTextReader.GetAttribute("ID");
myXmlTextReader.Read(); // Read next element, possibly another Transaction tag
}
}
//All Batch tags are completed.Move to next tag
myXmlTextReader.Read();
}
// Close the XML memory stream.
myXmlTextReader.Close();
myXmlDocument.Close();
}
}
You can copy it to a file stream like so:
string fullPath = Path.Combine(filePath, fileName);
FileStream fileStream = new FileStream(fullPath, FileMode.Open);
Image image = Image.FromStream(fileStream);
MemoryStream memoryStream = new MemoryStream();
image.Save(memoryStream, ImageFormat.Jpeg);
//Close File Stream
fileStream.Close();
I'm trying to set up an API that generate PDF from web page (provided as URL). The API is gotenberg from thecodingmachine. I have it on Docker, it works just fine, I can't generate PDF through http request send with curl (for now I'm just trying to make it work, so I use the request provided as example in the documentation)
Now I am trying to make it work with my groovy/grails app. So I'm using the java tools to make the request.
Now here is my problem : the PDF file I get is blank (my app opend directly in my browser). It do has the right content, if I open it with the text editor, it's not empty, and it has almost the same content as the one I make using the curl request (which isn't blank).
I am 99% sure the problem come from the encoding. I tried changing the InputStreamReader encoding parameter, but it doesn't change anything. Here I put "X-MACROMAN" because that the encoding inside the pdf file that isn't blank, but it still doesn't change.
Here is my code :
static def execute(def apiURL)
{
def httpClient = HttpClients.createDefault()
// Request parameters and other properties.
def request = new HttpPost(apiURL)
MultipartEntityBuilder builder = MultipartEntityBuilder.create()
builder.addTextBody("remoteURL", 'https://google.com')
builder.addTextBody("marginTop", '0')
builder.addTextBody("marginBottom", '0')
builder.addTextBody("marginLeft", '0')
builder.addTextBody("marginRight", '0')
HttpEntity multipart = builder.build()
request.setEntity(multipart)
def response = httpClient.execute(request)
BufferedReader rd = new BufferedReader(
new InputStreamReader(response.getEntity().getContent(), "X-MACROMAN"))
StringBuffer result = new StringBuffer()
String line = ""
Boolean a = Boolean.FALSE
while ((line = rd.readLine()) != null) {
if(!a){
a = Boolean.TRUE
}
else {
result.append("\n")
}
result.append(line)
}
return result
I am 99% sure the problem come from the encoding. I tried changing the InputStreamReader encoding parameter, but it doesn't change anything. Here I put "X-MACROMAN" because that the encoding inside the pdf file that isn't blank, but it still doesn't change.
Did I made myself clear ? And does those who understands has any ideas why my PDFs are blank ?
I am using the following code to serialize my object
DataContractSerializer ser = new DataContractSerializer(obj.GetType());
String text;
using (MemoryStream memoryStream = new MemoryStream())
{
ser.WriteObject(memoryStream, obj);
byte[] data = new byte[memoryStream.Length];
Array.Copy(memoryStream.GetBuffer(), data, data.Length);
text = Encoding.UTF8.GetString(data);
}
My object is serializing like this:
<Meta xmlns:i=\"http://www.w3.org/2001/XMLSchema-instance\"><Description>This is my new file
\n
\nMore Data</Description><Title>My Other Test Document</Title></Meta>
Notice that my \n was not escaped. Why is that? What is the best way to send \r\n through xml.
I searched and I dont see any articles about this. Am I missing some attribute in my serialize code?
Babel -- not at all, you're not missing any special attributes here. The \n is getting serialized. If it were being interpreted as a non-newline special character, you would see \n in the string, not \n itself. Are you not catching the newline on the client end, and have you verified it by spitting it out via an stdout call?