extract text from pdf file using javascript

extract text from pdf file using javascript

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The INSERT statement is pretty straightforward; the id and data are bound to the query before it is executed. When the image has been inserted, all the tags given to the method are passed to addTag so that they are inserted into the database. Listing 13-21. Add an image and its tags to the database. void ImageCollection::addImage( QImage image, QStringList tags ) { QBuffer buffer; QImageWriter writer(&buffer, "PNG"); writer.write(image); QSqlQuery qry; int id; qry.prepare( "SELECT COUNT(*) FROM images" ); qry.exec(); qry.next(); id = qry.value(0).toInt() + 1; qry.prepare( "INSERT INTO images (id, data) VALUES (:id, :data)" ); qry.bindValue( ":id", id ); qry.bindValue( ":data", buffer.data() ); qry.exec(); foreach( QString tag, tags ) addTag( id, tag ); } The process for getting a stored image back from the database into a QImage object involves the same classes. Listing 13-22 shows you how it s done. Because the getImage method doesn t have to worry about generating new id values or tags, it is more straightforward than the addImage method. First the query is prepared and executed; then the QByteArray is extracted from the result. The array is passed on to a QBuffer, which you can use from a QImageReader. Notice that you must open the buffer for reading before passing it to the image reader. From the image reader you can get the QImage object that you return as a result. Listing 13-22. From the query, through a buffer, to the reader QImage ImageCollection::getImage( int id ) { QSqlQuery qry; qry.prepare( "SELECT data FROM images WHERE id = :id" ); qry.bindValue( ":id", id );

Each of them searches for a given string in the header of the same name, except for the send tests, which look at the Date header: BCC string CC string FROM string HEADER name string SUBJECT string TO string.

if( !qry.exec() ) qFatal( "Failed to get image" ); if( !qry.next() ) qFatal( "Failed to get image id" ); QByteArray array = qry.value(0).toByteArray(); QBuffer buffer(&array); buffer.open( QIODevice::ReadOnly ); QImageReader reader(&buffer, "PNG"); QImage image = reader.read(); return image; } As you can see, it is fairly easy to store data as a file embedded in a database. Because the QIODevice class is what is used by all Qt streams, and the class is base class of both QFile and QBuffer, you can use this method for pretty much any file format.

If you type text into this area without markup, the text will appear in the background of the mashup with no styling. Using HTML tags gives you greater control and flexibility of the content that will appear. Type <h1 style= color:black ><center>My First Mashup!<center></h1> into the text area (see Figure 3-11). The h1 tag is an HTML tag that represents the font style Header 1. Using it in this code formats the text to appear larger and bolder than surrounding text. The style attribute sets the color of the font to black (by default, the font color is white). The center tag centers the text on the page. Without enclosing the text in this tag, the text would be aligned at the far right. Click the Go Back menu item to save the HTML. Click Preview to test the mashup again. As Figure 3-12 shows, the HTML appears centered, like the News Reader, on the page.

An IMAP message has two dates: the internal Date header specified by the sender, which is called its send date, and the date at which it actually arrived at the IMAP server. (The former could obviously be a forgery; the latter is as reliable as the IMAP server and its clock.) So there are two sets of criteria for dates, depending on which date you want to query by: BEFORE 01-Jan-1970 ON 01-Jan-1970 SINCE 01-Jan-1970 SENTBEFORE 01-Jan-1970 SENTON 01-Jan-1970 SENTSINCE 01-Jan-1970 Finally, there are two search operations that refer to the text of the message itself these are the big workhorses that support full-text search of the kind your users are probably expecting when they type into a search field in an e-mail client: BODY string: The message body must contain the string. TEXT string: The entire message, either body or header, must contain the string somewhere. See the documentation for the particular IMAP server you are using to learn whether it returns any near miss matches, like those supported by modern search engines, or only exact matches for the words you provide. If your strings contain any characters that IMAP might consider special, try surrounding them with double-quotes, and then backslash-quote any double-quotes within the strings themselves: >>> c.search(r'TEXT "Quoth the raven, \"Nevermore.\""') [2652L] Note that by using an r'...' string here, I avoided having to double up the backslashes to get single backslashes through to IMAP.

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