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Defining a workflow variable in XAML is almost identical to defining an argument, in that you can do so directly on the designer (this time with the Variables button). The difference is that arguments are used to capture data passed in by the host, whereas variables are simply points of data in the workflow which will be used to influence its runtime behavior. Using the Variables aspect of the designer, add a new string variable named YesOrNo. Notice that if you have multiple parent containers in your workflow (for example, a Flowchart containing another Sequence), you can pick the scope of the variable. Here, your only choice is the root Flowchart. Next, select the InvokeMethod activity on the designer, and using the Properties window of Visual Studio 2010, set the Result property to your new variable (Figure 26-10).

Drupal provides a powerful function called file_scan_directory(). It looks through a directory for files that match a given pattern.

Figure 26-10. The fully configured InvokeMethod Now that you can grab a piece of data from an external method call, you can use it to make a runtime decision in your flow chart using the FlowDecision activity.

With version 3.1, bash added a -v option to store the output in a variable instead of printing it to the standard output: $ printf -v num4 "%04d" 4 $ printf "%s\n" "$num4" 0004

A FlowDecision activity is used to take two possible courses of action, based on the truth or falsity of a Boolean variable, or a statement which resolves to a Boolean value. Drag one of these activities onto your designer, and connect it to the InvokeMethod activity (Figure 26-11).

Note If you need to respond to multiple branching conditions within a flowchart, make use of the FlowSwitch<T> activity. This allows you to define any number of paths, which will be entered based on the value of a defined workflow variable.

file_scan_directory($dir, $mask, $options = array(), $depth = 0)

Set the Condition property (using the Properties window) of your FlowDecision activity to the following code statement, which you can type directly into the editor: YesOrNo.ToUpper() = "Y" Here you are testing an upper case version of your YesOrNo variable against the value Y . Remember, you are entering VB code here, so you don t want to use the C# equality operator (==), but the VB equality operator (=).

You now need to build the activities which will occur on each side of the FlowDecision activity. On the false side, connect a final WriteLine activity which prints out a hard coded message of your choosing, followed by a TerminateWorkflow activity (Figure 26-12).

Let s walk through the function signature: $dir is the base directory or URI to scan, without trailing slash. $mask is the pattern to apply to the files that are contained in the directory. This is a regular expression. $options is an associative array of additional options, with the following elements: nomask: The preg_match() regular express of the files to ignore. This defaults to /(\.\ |CVS)$/ . callback: The callback function to call for each match recurse: When TRUE, the directory scan will recurse the entire tree starting at the provided directory. The default is TRUE. key: The key to be used for the returned associative array of files. Possible values are uri , for the file s URI; filename , for the basename of the file; and name for the name of the file without the extension. The default is uri . min_depth: Minimum depth of directories to return file from. Defaults to 0.

Figure 26-12. The "false" branch Strictly speaking, you don t need to use the TerminateWorkflow activity, as this workflow would simply end once you reach the end of the false branch. However, by using this activity type, you can throw back an exception to the workflow host, informing them exactly why you are stopping. This exception can be configured in the Properties window. Assuming you have selected the TerminateWorkflow activity on the designer, use the Properties window, and click on the ellipse button for the Exception property. This will open up an editor which allows you to throw back an exception, just like if you were doing so in code (VB code that is; see Figure 26-13).

Figure 26-13. Configuring an exception to throw when the TerminateWorkflow activity is encountered Complete the configuration of this activity by setting the Reason property to YesOrNo was false .

$depth is the current depth of recursion. This parameter is used only internally and should not be passed in.