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7. Insert the code in Listing 13-1 to the click event handler for button1. This will provide the first exception.

As we mentioned briefly in the introduction, it is possible to have a scalar variable with numeric and string values that are not direct conversions of each other. One of the more famous examples of this is the system error number or Errno variable $!, which Perl uses to store the result of built-in functions that call into the operating system open and close are perhaps the most frequently seen cases. In numeric context, $! evaluates to the system error number itself. In string context, $! evaluates to a string describing the error number. This is an appropriate and useful alternate form for the error value to take, but not at all a direct conversion of any kind. The following example shows $! being used in both string and numeric contexts: $opened_ok=open FILE,"doesnotexist.txt"; unless ($opened_ok) { print "Failed to open: $!\n"; #use of $! in string context exit $!; #use of $! in numeric context } We can create our own scalars with different alternate forms using the dualvar subroutine from the Scalar::Util package. It takes two arguments, the first of which is a number (either integer or floating point) and the second of which is a string. It returns a scalar with both values preset. $PI=dualvar(3.1415926,"PI"); print "The value of $PI is", $PI+0; #produces "The value of PI is 3.1415926" The string and numeric values will be used in their respective contexts with neither triggering a new conversion of the other. Perl will still convert the integer or floating-point number (whichever we set initially) to the other numeric type as required. It is important to realize that the dual-valued nature of such a variable is easily destroyed, however. If we assign a new integer value, for example,

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Quality isn t just determined by the image format. It also depends on the way you draw the image content onto the in-memory bitmap. GDI+ allows you to choose between optimizing your drawing code

As a trivial example, the following AUTOLOAD subroutine just returns the missing subroutine name as a string: sub AUTOLOAD { our $AUTOLOAD; # or 'use vars' for Perl < 56 return $AUTOLOAD; } Because $AUTOLOAD is a package variable that we have not declared, we need to gain access to it with the our directive if use strict is in effect (Perl versions before 56 need to have use vars instead) The preceding example allows us to write strange looking statements like this: $, = " "; print "", Hello, Autoloading, World; This is identical in effect to print "main::Hello", "main::Autoloading", "main::World"; In other words, this AUTOLOAD subroutine interprets unqualified barewords as strings A slightly more useful example of the same technique is shown by this HTML tag generator, which automatically creates matching start and end tags, with any supplied parameters sandwiched in between.

for appearance or speed. When you choose to optimize for the best appearance, .NET uses extra rendering techniques such as antialiasing to improve the drawing. Antialiasing smooths jagged edges in shapes and text. It works by adding shading at the border of an edge. For example, gray shading might be added to the edge of a black curve to make a corner look smoother. Technically, antialiasing blends a curve with its background. Figure 11-9 shows a close-up of an antialiased ellipse.

Note the regular expression to strip off the package prefix: sub AUTOLOAD { our ($AUTOLOAD); # again, 'use vars' if Perl < 56 $AUTOLOAD =~ s/^*:://; # strip the package name return "<$AUTOLOAD> \n" join("\n",@_) "</$AUTOLOAD> \n"; } We can now write an HTML page programmatically using functions that we haven t actually defined, in a similar (and much shorter, albeit less sophisticated) way to the CGI module Here is an example HTML document created using the preceding autoloader subroutine in a single line of code: print html(head(title("Autoloaded HTML")), body(h1("Hi There"))); While functional, this example has a few deficiencies For a start, we can invent any tag we like, including misspelled ones Another problem is that it does not learn from the past; each time we call a nonexistent subroutine, Perl looks for it, fails to find it, then calls AUTOLOAD.

Listing 13-1. button1_Click()

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