I am using FontAwesome to display glyphs in my Xamarin Android application. If I hardcode the glyph like this, where everything works fine:
string iconKey = "\uf0a3";
var drawable = new IconDrawable(this.Context, iconKey, "Font Awesome 5 Pro-Regular-400.otf").Color(Xamarin.Forms.Color.White.ToAndroid()).SizeDp(fontSize);
However, if what I have is the four letter code "f0a3" from FontAwesome's cheatsheet, stored in a string variable, I don't know how to set my iconKey variable to a value that works. Just concatenating a "\u" onto the beginning doesn't work, which makes sense since that's a Unicode escape indicator, not part of a standard string, but I don't know what to do instead. I also tried converting to and from Unicode in various random ways - e.g.
iconKey = unicode.GetChars(unicode.GetBytes("/u" + myFourChar.ToString())).ToString();
but unsurprisingly that didn't work either.
The IconDrawable is from here. The value I send becomes an input there to the Paint.GetTextBounds method and the Canvas.DrawText method.
Thanks for any assistance!
Found the answer here. Here is the code I am using, based on that post but simplified since I have only one hexadecimal character to handle:
string myString = "f0a3";
var chars = new char[] { (char)Convert.ToInt32(myString, 16) };
string iconKey = new string(chars);
var drawable = new IconDrawable(this.Context, iconKey, "Font Awesome 5 Pro-Regular-400.otf").Color(Xamarin.Forms.Color.White.ToAndroid()).SizeDp(fontSize);
How do you append text past then last line of a document in the editor using an extension?
I have an extension that either creates a new, untitled document, or it appends text to the bottom/end only of an existing document. It is the latter case that I am having trouble with. The extension does not depend on caret/cursor/selection position. I've tried both edit.insert() and edit.replace(), with various position/range values of getting past the last character, but my text addition is always placed above the last line:
Before operation (line 20 is the last line of the document):
What I get. Note the existing blank line is below the inserted text:
What I want. Note the existing blank line is above the inserted text.:
The code:
var lastLine = editor.document.lineAt(editor.document.lineCount - 1);
const replaceContent = 'Inserted Text';
editor.edit((editBuilder) => {
editBuilder.replace(lastLine.range.end, replaceContent);
});
I've found lots of SO articles for inserting/replacing text, just nothing specific to adding to the very end of an editor buffer.
// Get the text editor object
const editor = vscode.window.activeTextEditor;
// Get the current document object
const document = editor.document;
// Get the last line of the document
const lastLine = document.lineAt(document.lineCount - 1);
// Get the last line text range
const range = new vscode.Range(lastLine.range.start, lastLine.range.end);
// Append the text to the document
editor.edit((editBuilder) => {
editBuilder.insert(range.end, "\nAppended text");
});
When I use checkbox on pdf form, pdftk gives the following error and does not create output pdf.
Unhandled Java Exception:
Unhandled Java Exception:
java.lang.NullPointerException
at gnu.gcj.runtime.NameFinder.lookup(libgcj.so.12)
at java.lang.Throwable.getStackTrace(libgcj.so.12)
at java.lang.Throwable.stackTraceString(libgcj.so.12)
at java.lang.Throwable.printStackTrace(libgcj.so.12)
at java.lang.Throwable.printStackTrace(libgcj.so.12)
Today I am having a similar problem with Checkbox. And I also saw java.lang.NullPointerException error. After investigation, I found that it is because my fillable checkbox is using custom glyphicon ('X') as checkmark instead of default styling.
So after reading this answer https://stackoverflow.com/a/29034948/11898471, It does workout by getting rid of my custom checkbox glyphicon. Without seeing your code I don't know exactly how you may do it your way, but my situation is to flatten a client uploaded PDF form with custom checkbox. What I did, is to extract all form data and re-fill the form so they get rid of all custom checkbox markup. Something like:
$pdf = new Pdf($uploadedFile->getRealPath(), ['command' => env('PDFTK_PATH')]);
/* Extract form field to remove custom markup field that cannot be filled. Eg: custom checkbox icon */
$pdf2 = new Pdf($uploadedFile->getRealPath(), ['command' => env('PDFTK_PATH')]);
$data = $pdf2->getDataFields();
$data = (array) $data;
$fill_data = [];
foreach ($data as $field) {
if (isset($field['FieldValue'])) {
$fill_data[$field['FieldName']] = $field['FieldValue'];
}
}
/* Update form field */
$pdf->fillForm($fill_data)
->flatten()
->saveAs(storage_path('app/'.$flattenedFilename));
I'm trying to draw QR barcodes in a PDF file using iTextSharp. If I'm using English text the barcodes are fine, they are decoded properly, but if I'm using Chinese text, the barcode is decoded as question marks. For example this character '测' (\u6D4B) is decoded as '?'. I tried all supported character sets, but none of them helped.
What combination of parameters should I use for the QR barcode in iTextSharp in order to encode correctly Chinese text?
iText and iTextSharp apparently don't natively support this but you can write some code to handle this on your own. The trick is to get the QR code parser to work with just an arbitrary byte array instead of a string. What's really nice is that the iTextSharp code is almost ready for this but doesn't expose the functionality. Unfortunately many of the required classes are sealed so you can't just subclass them, you'll have to recreate them. You can either download the entire source and add these changes or just create separate classes with the same names. (Please check over the license to make sure you are allowed to do this.) My changes below don't have any error correction so make sure you do that, too.
The first class that you'll need to recreate is iTextSharp.text.pdf.qrcode.BlockPair and the only change you'll need to make is to make the constructor public instead of internal. (You only need to do this if you are creating your own code and not modifying the existing code.)
The second class is iTextSharp.text.pdf.qrcode.Encoder. This is where we'll make the most changes. Add an overload to Append8BitBytes that looks like this:
static void Append8BitBytes(byte[] bytes, BitVector bits) {
for (int i = 0; i < bytes.Length; ++i) {
bits.AppendBits(bytes[i], 8);
}
}
The string version of this method converts text to a byte array and then uses the above so we're just cutting out the middle man. Next, add a new overload to the constructor that takes in a byte array instead of a string. We'll then just cut out the string detection part and force the system to byte-mode, otherwise the code below is pretty much the same.
public static void Encode(byte[] bytes, ErrorCorrectionLevel ecLevel, IDictionary<EncodeHintType, Object> hints, QRCode qrCode) {
String encoding = DEFAULT_BYTE_MODE_ENCODING;
// Step 1: Choose the mode (encoding).
Mode mode = Mode.BYTE;
// Step 2: Append "bytes" into "dataBits" in appropriate encoding.
BitVector dataBits = new BitVector();
Append8BitBytes(bytes, dataBits);
// Step 3: Initialize QR code that can contain "dataBits".
int numInputBytes = dataBits.SizeInBytes();
InitQRCode(numInputBytes, ecLevel, mode, qrCode);
// Step 4: Build another bit vector that contains header and data.
BitVector headerAndDataBits = new BitVector();
// Step 4.5: Append ECI message if applicable
if (mode == Mode.BYTE && !DEFAULT_BYTE_MODE_ENCODING.Equals(encoding)) {
CharacterSetECI eci = CharacterSetECI.GetCharacterSetECIByName(encoding);
if (eci != null) {
AppendECI(eci, headerAndDataBits);
}
}
AppendModeInfo(mode, headerAndDataBits);
int numLetters = dataBits.SizeInBytes();
AppendLengthInfo(numLetters, qrCode.GetVersion(), mode, headerAndDataBits);
headerAndDataBits.AppendBitVector(dataBits);
// Step 5: Terminate the bits properly.
TerminateBits(qrCode.GetNumDataBytes(), headerAndDataBits);
// Step 6: Interleave data bits with error correction code.
BitVector finalBits = new BitVector();
InterleaveWithECBytes(headerAndDataBits, qrCode.GetNumTotalBytes(), qrCode.GetNumDataBytes(),
qrCode.GetNumRSBlocks(), finalBits);
// Step 7: Choose the mask pattern and set to "qrCode".
ByteMatrix matrix = new ByteMatrix(qrCode.GetMatrixWidth(), qrCode.GetMatrixWidth());
qrCode.SetMaskPattern(ChooseMaskPattern(finalBits, qrCode.GetECLevel(), qrCode.GetVersion(),
matrix));
// Step 8. Build the matrix and set it to "qrCode".
MatrixUtil.BuildMatrix(finalBits, qrCode.GetECLevel(), qrCode.GetVersion(),
qrCode.GetMaskPattern(), matrix);
qrCode.SetMatrix(matrix);
// Step 9. Make sure we have a valid QR Code.
if (!qrCode.IsValid()) {
throw new WriterException("Invalid QR code: " + qrCode.ToString());
}
}
The third class is iTextSharp.text.pdf.qrcode.QRCodeWriter and once again we just need to add an overloaded Encode method supports a byte array and that calls are new constructor created above:
public ByteMatrix Encode(byte[] bytes, int width, int height, IDictionary<EncodeHintType, Object> hints) {
ErrorCorrectionLevel errorCorrectionLevel = ErrorCorrectionLevel.L;
if (hints != null && hints.ContainsKey(EncodeHintType.ERROR_CORRECTION))
errorCorrectionLevel = (ErrorCorrectionLevel)hints[EncodeHintType.ERROR_CORRECTION];
QRCode code = new QRCode();
Encoder.Encode(bytes, errorCorrectionLevel, hints, code);
return RenderResult(code, width, height);
}
The last class is iTextSharp.text.pdf.BarcodeQRCode which we once again add our new constructor overload:
public BarcodeQRCode(byte[] bytes, int width, int height, IDictionary<EncodeHintType, Object> hints) {
newCode.QRCodeWriter qc = new newCode.QRCodeWriter();
bm = qc.Encode(bytes, width, height, hints);
}
The last trick is to make sure when calling this that you include the byte order mark (BOM) so that decoders know to decode this properly, in this case UTF-8.
//Create an encoder that supports outputting a BOM
System.Text.Encoding enc = new System.Text.UTF8Encoding(true, true);
//Get the BOM
byte[] bom = enc.GetPreamble();
//Get the raw bytes for the string
byte[] bytes = enc.GetBytes("测");
//Combine the byte arrays
byte[] final = new byte[bom.Length + bytes.Length];
System.Buffer.BlockCopy(bom, 0, final, 0, bom.Length);
System.Buffer.BlockCopy(bytes, 0, final, bom.Length, bytes.Length);
//Create are barcode using our new constructor
var q = new BarcodeQRCode(final, 100, 100, null);
//Add it to the document
doc.Add(q.GetImage());
Looks like you may be out of luck. I tried too and got the same results as you did. Then looked at the Java API:
"*CHARACTER_SET the values are strings and can be Cp437, Shift_JIS and
ISO-8859-1 to ISO-8859-16. The default value is ISO-8859-1.*"
Lastly, looked at the iTextSharp BarcodeQRCode class source code to confirm that only those characters sets are supported. I'm by no means an authority on Unicode or encoding, but according to ISO/IEC 8859, the character sets above won't work for Chinese.
Essentially the same trick that Chris has done in his answer could be implemented by specifying UTF-8 charset in barcode hints.
var hints = new Dictionary<EncodeHintType, Object>() {{EncodeHintType.CHARACTER_SET, "UTF-8"}};
var q = new BarcodeQRCode("\u6D4B", 100, 100, hints);
If you want to be more safe, you can start your string with BOM character '\uFEFF', like Chris suggested, so it would be "\uFEFF\u6D4B".
UTF-8 is unfortunately not supported by QR codes specification, and there are a lot of discussions on this subject, but the fact is that most QR code readers will correctly read the code created by this method.
i am using the following code
String keyword=request.getParameter("keyword");
keyword = keyword.toLowerCase();
keyword.replaceAll(" "," "); //first double space and then single space
keyword = keyword.trim();
System.out.println(keyword);
i am given the input as t s
but iam getting as
[3/12/10 12:07:10:431 IST] 0000002c SystemOut O t s // here i am getting the two spaces
how can decrease two single space
use the follwoing program
public class whitespaces {
public static void main(String []args){
try{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String str = br.readLine();
System.out.println( str.replaceAll("\b\s{2,}\b", " "));
}catch(Exception e){
e.printStackTrace();
}
}
}
thanks,
murali
If your database always have only one space, you could use some keypress event to automatically ignore any occurrences of multiple spaces (by replace double spaces with single space in the search string or something).
StackOverflow has solved the same (or at least a similar) problem regarding spaces in tags, by not having them. Instead, if you want to denote a space in a tag on SO, use - (dash). You could run a query to replace all spaces with - in your database (even though it would probably take quite some time to run you'll only have to do it once). If you want to display them as spaces on the page, just do a replace when you render.