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ftp.cme.nist.gov:/pub/expect/expect.tar.Z using barcode encoding for visual studio .net control to generate, create qr bidimensional barcode image in visual studio .net applications. Microsoft Windows Official Website The rest of this section qrcode for .NET provides a short overview of expect and gives a few tips that may help you understand how expect works. Expect is a rich facility, however, and this section only scratches the surface.

The core expect commandsl There are four fundamental commands added by expect: spawn, exp_send, expect, and interact. The spawn command executes a program and returns a handle that is used to control I/O to the program. The exp_send command sends.

input to the program. (I f you are not also using Tk, then you can shorten this command to send.) The expect command pattern matches on output from the program.

The expect command is used somewhat like the Tcl switch command. There are several branches that have different patterns, and a block fo Tcl commands is associated with each pattern. When the program generates output that matches a pattern, the associated Tcl commands are executed.

The send_user and expect_user commands are analagous to exp_send and expect, but they use the I/O connection to the user instead of the process. A common idiom is to expect a prompt from the process, expect_user the response, and then exp_send the response to the program. Generally the user sees everything so you do not need to send_user all the program output.

The interact command reconnects the program and the user so you can interact with the program directly. The interact command also does pattern matching, so you can set up Tcl commands to execute when you type certain character sequences or when the program emits certain strings. Thus you can switch back and forth between human interaction and program controlled inter-.

Created: January 6, 1995 qr bidimensional barcode for .NET Extensions.fm3 Copyright Prentice Hall DRAFT: 1/13/95.

Expect: Controlling Interactive Programs action. Expect is quite .NET qr barcode powerful! Pattern matching The default pattern matching used by expect is glob-style.

You can use regular expression matching by specifying the -re option to the expect command. Most of the work in writing an expect script is getting the patterns right.When writing your patterns, it is important to remember that expect relies on the Tcl parser to expand backslash sequences like \r\n (carriage return, newline), which is often an important part of an expect pattern.

There is often a \n and or \r at the end of a pattern to make sure that a whole line is matched, for example. You need to group your patterns with double-quotes, not braces, to alllow backslash substitutions. If you use regular expressions the quoting can get complicated.

You have to worry about square brackets and dollar signs, which have different meanings to Tcl and the regular expression parser. Matching a literal backslash is the most tedious because it is special to both Tcl and the regular expression parser. You ll need four backslashes, which Tcl maps into two, which the regular expression interprets as a single literal backslash.

There are a few pattern keywords. If an expect does not match within the timeout period, the timeout pattern is matched. If the process closes its output stream, then the eof pattern is matched.

Important variables Expect uses a number of variables. A few of the more commonly used variables are described here. The spawn command returns a value that is also placed into the spawn_id variable.

If you spawn several programs, you can implement a sort of job control by changing the value of the global spawn_id variable. This affects which process is involved with exp_send, expect, and interact commands. You can also specify the id explicity with a -i argument to those commands.

Hint: If you use spawn in a procedure, you probably need to declare spawn_id as a global variable. Otherwise, an exp_send or expect in anther context will not see the right value for spawn_id. It is not strictly necessary to make spawn_id global, but it is certainly necessary if you use it in different contexts.

The timeout variable controls how long expect waits for a match. Its value is in seconds. When a pattern is matched by expect, the results are put into the expect_out array.

The expect_out(0,string) element has the part of the input that matched the pattern. If you use subpatterns in your regular expressions, the parts that match those are available in expect_out(1,string), expect_out(2,string), and so on. The expect_out(buffer) element has the input that matched the pattern, plus everything read before the match since the last expect match.

The interact command initializes an array called interact_out which has a similar structure.. Created: January 6, 1995 Extensions.fm3 Copyright Prentice Hall DRAFT: 1/13/95.
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