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vb.net code 39 reader

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One line of vb . net code finishes the job. The above VB . NET code will get all Code39 barcodes in image file " code39 - barcode .gif". You can customize our . NET barcode reader component, to improve Code 39 barcode reading speed, when you are scanning large image size (like 4mb per image).

... while start <= stop: ... yield start ... start += step ... >>> for x in step_to(1, 10): ... print x ... 0 1 2 3 4 5 6 7 8 9 10 >>> for x in step_to(2, 10): ... print x ... 0 2 4 6 8 10 >>> If the yield statement is seen in the scope of a function, then that function is compiled as if it s a generator function. Unlike other functions, you use the return statement only to say, I m done, that is, to exit the generator, and not to return any values. You can think of return as acting like a break in a forloop or while-loop. Let s change the step_to function just a bit to check and ensure that the factor is less than the stopping point. We ll add a return statement to exit the generator if the factor is greater or equal to the stop. Listing 4-27 >>> def step_return(factor, stop): ... step = factor ... start = 0 ... if factor >= stop: ... return ... while start <= stop: ... yield start ... start += step ... >>> for x in step_return(1,10): ... print x ... 0 1 2

vb.net code 39 reader

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The result table in Figure 6-5 is very useful for generating reports about teams and their members. Figure 6-6 shows a report based on the query in Listing 6-3. The report has been grouped by team, with the team and manager information (from the Team table and m2 copy of the Member table) in a group header. The members of the team (from the first copy m of the Member table) are in the detail part of the report.

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vb.net code 39 reader

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3 4 5 6 7 8 9 10 >>> for x in step_return(3,10): ... print x ... 0 3 6 9 >>> for x in step_return(3,3): ... print x ... If you attempt to return an argument then a syntax error will be raised. Listing 4-28. def g(): yield 1 yield 2 return None for i in g(): print i SyntaxError: 'return' with argument inside generator Many useful generators actually will have an infinite loop around their yield expression, instead of ever exiting, explicitly or not. The generator will essentially work each time next() is called throughout the life of the program. Listing 4-29. Pseudocode for generator using infinite loop while True: yield stuff This works because a generator object can be garbage collected as soon as the last reference to the generator is used. The fact that it uses the machinery of function objects to implement itself doesn t matter.

In this section, I ll look at two examples to see how you can use the Ajax approach in a web application. The first example applies simple form validation, while the second revisits the contacts example from the previous chapter.

vb.net code 39 reader

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Generators are actually compiled differently from other functions. Each yield point saves the state of unnamed local variables (Java temporaries) into the frame object, then returns the value to the function 94

Figure 6-6. A report based on the query in Listing 6-3 (the result table in Figure 6-5)

I ll start with a simple example that shows how to use the XMLHttpRequest object to validate a username in a form. When the user enters the username, I ll use the XMLHttpRequest object to check an XML file to see if the username is already in use. You can find this example in the form folder with your resources. The file form.htm contains the following simple form: <form> <p> Username: <input type="text" id="txtUserName" size="20" onblur="doCheck(this.value);"/> <span id="invalidMessage" class="invalid"></span> </p> <p> Password: <input type="text" id="txtPassword" size="20"/> </p> </form> The form checks the username by calling the doCheck() function when the user leaves the field the onblur event. It also contains a <span> element with the id invalidMessage that will display a message if the user enters a duplicate username. The doCheck() function creates the request and loads the file usernames.xml: function doCheck(username) { if (username.length > 0) { document.getElementById("invalidMessage").innerHTML = ""; if (window.XMLHttpRequest){ xmlhttp=new XMLHttpRequest(); } else if (window.ActiveXObject){

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