.NET/Java PDF, Tiff, Barcode SDK Library

puts "It exists!" if File.exist ("file1.txt") File.exist returns true if the named file exists. You could edit the MyFile class cre-

>>> hello_4('Mars') Hello, Mars! >>> hello_4('Mars', 'Howdy') Howdy, Mars! >>> hello_4('Mars', 'Howdy', '...') Howdy, Mars... >>> hello_4('Mars', punctuation='.') Hello, Mars. >>> hello_4('Mars', greeting='Top of the morning to ya') Top of the morning to ya, Mars! >>> hello_4() Traceback (most recent call last): File "<pyshell#64>", line 1, in hello_4() TypeError: hello_4() takes at least 1 argument (0 given)

winforms pdf 417 reader, winforms qr code reader, winforms upc-a reader, winforms data matrix reader, winforms gs1 128, winforms ean 13 reader, itextsharp remove text from pdf c#, find and replace text in pdf using itextsharp c#, winforms code 39 reader, itextsharp remove text from pdf c#,

ated in a previous example to check for the existence of a file before opening it to avoid a potential exception being thrown, like so:

class MyFile attr_reader :handle def initialize(filename) if File.exist (filename) @handle = File.new(filename, "r") else return false end end end

Because you are giving this presentation to such a small audience, try giving it in a printed form using notes pages handouts. But whatever way you go, with the BBP foundation in place, you have transformed what normally might be an informational list of facts into a much more meaningful and useful story that you carry forward both visually and verbally.

File.size returns the size of a file in bytes. If the file doesn t exist, an exception is thrown, so it would make sense to check its existence with File.exist first. puts File.size("text.txt")

How to Know When You re at the End of a File In previous examples you ve either used iterators to give you all the lines or bytes in a file, or you ve pulled only a few lines from a file here and there. However, it would be useful to have a foolproof way to know when the file pointer is at, or has gone past, the end of the file. The eof method provides this feature:

9

Note If I had given name a default value as well, the last example wouldn t have raised an exception.

f = File.new("test.txt", "r") catch(:end_of_file) do loop do throw :end_of_file if f.eof puts f.gets end end f.close

This example uses an infinite loop that you break out of by using catch and throw (as covered in 8). throw is only called if the file pointer is at, or past, the end of the file. This specific example is not particularly useful, as f.each could have performed a similar task, but in situations where you might be moving the file pointer around manually, or making large jumps through a file, checking for an end of file situation is useful.

Beyond courtrooms and meeting rooms, BBP has tremendous potential to guide the structure of presentations used in classrooms and training rooms at every educational level After all, the research realities described in 2 that inspire BBP are being extensively tested and applied by educational psychologists interested in improving learning using multimedia If you use PowerPoint to teach, you ll nd BBP a practical and effective method to help your students learn new information And just as with The Analysis example, applying BBP to an educational presentation usually does not involve creating new material, but rather you will restructure existing material in a new way to make the material easier for your students working memory to handle As with the other applications of BBP in other contexts, with an educational presentation, you always start with Act I of the story template.

All files are contained within various directories, and Ruby has no problem handling these too. Whereas the File class handles files, directories are handled with the Dir class.

That s pretty flexible, isn t it And we didn t really have to do much to achieve it either. In the next section we get even more flexible.

Navigating Through Directories To change directory within a Ruby program, use Dir.chdir: