winforms qr code reader

winforms qr code reader

winforms qr code reader

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With an understanding of the MIDP Record Management System, we can apply that knowledge to the tutorial application. In the previous chapter, we created the basic MIDP application structure (the MIDlet), the user interface and event handling mechanisms for a stock and mutual fund quote system. Remember, the purpose of this system was to get current stock and mutual fund prices and store them for later retrieval. Up to this point, no data has actually been stored or retrieved by the application. Instead, we stubbed out the user interface to respond as if data were being retrieved when, in reality, it was just phony data remanufactured for each user interface request. In the design of the application, recall that ObtainQuote and RetrieveQuote use cases made use of two other use cases, namely SavePrice and RetrievePrice. These use cases stored and fetched investment price information in and out of the persistent mechanism. We create the code that implements these use cases in sections 6.4.2 and 6.4.3.

" The meanings of the bits in StatusFlags are as follows: " MSB " " " " " " LSB 0 1-2 3 4 ... 14 not used (should be 0) 15-32 not used (should be 0) error detected: 1=yes, 0=no kind of error: 0=syntax, 1=warning, 2=severe, 3=fatal reserved (should be 0) printer status: 1=ready, 0=not ready

java.sql.Blob and java.sql.Clob are the most efficient way to handle large objects in Java. Unfortunately, an instance of Blob or Clob is only useable until the JDBC transaction completes. So if your persistent class defines a property of java.sql.Clob or java.sql.Blob (not a good idea anyway), you ll be restricted in

<property name="lastModified" column="LAST_MODIFIED" update="false" insert="false" generated="always"/>

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As we expected, the values were successfully passed into that task and were then passed to the console logger. Now we can see how to pass a value from a task back to the calling MSBuild project le. Once again I ve modi ed the previous task and created a new one, HelloWorld4, which exposes an output property named Message. The class is shown as follows:

Exercise 5-2. This exercise also isn t too difficult. You saw how to add a ValidationSummary control earlier in the chapter. All you need to do is change the text of the other validator controls to ErrorMessage properties, and the messages will display automatically in the summary control. To check the user s age, you need two controls: A RequiredFieldValidator, to make sure the user can t leave the field blank, and a CompareValidator to make sure that the user is over 18 (or that they say they are, anyway). The RequiredFieldValidator is the same as the ones in Exercise 5-1. For the CompareValidator, be sure to set the ControlToValidate property to txtAge (or whatever you called the age TextBox), set the Type property to Integer, set the Operator property to GreaterThanEqual, and set the ValueToCompare property to 18. You want to make sure that the user enters a date when they d like you to call, and that the date is sometime in July. Sounds like a job for the RangeValidator. You need to make sure the user enters a date, so add a RequiredFieldValidator that validates txtCallDate first. Then add a RangeValidator that also validates txtCallDate. Make sure you set the Type to Date, or you ll get unexpected results. Set the MaximumValue to 07/31/2007, and the MinimumValue to 07/01/2007. Add appropriate text and error messages, and you re done. Try it out, and you ll see that the user can only enter dates in July. Example C-19 shows the markup file for this exercise.

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