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modifications to Listing 8-15 Refer to Listing 8-15 for a complete discussion of each line of code that isn t modified in this example The first modification is found in the third try { } block where an instance of the Filter class is created The Filter class is an implementation of the RecordFilter interface The constructor of the Filter class is passed the search criteria, which is the integer 10 Reference to the instance of the Filter class is passed as the first parameter to the enumerateRecords() method, which returns a RecordEnumeration The enumerateRecords() method calls methods defined in the Filter class Notice that a null is passed as the second parameter to the enumerateRecords() since a RecordComparator is not being used to sort the RecordEnumeration Let s move toward the end of the example and review the definition of the Filter class where three methods are defined The first method is the constructor, which receives the search criteria as a parameter The search criteria is assigned to locate an integer variable, which has previously been initialized to zero The matches() method is the next method defined in the Filter class This is the method called by the enumerateRecords() method to determine whether the current record should or should not be included in the RecordEnumeration The enumerateRecords() method passes the matches() method a byte array containing the current record This byte array is then converted to a byte array input stream, which is further converted to a data input stream The readXXX() method is then called to read each column from the data input stream Columns must be read in the order they are written using the appropriate readXXX() method that reflects the data type of the column, as discussed previously in this chapter You don t need to assign the results of the readXXX() method to a variable unless the value of the column is being compared to the search criteria Furthermore, you can stop reading columns from the data input stream once the column used for the comparison has been read In this example, the first column is a string containing a person s name, and the second column is an integer The first column is read, but the value of the first column is not assigned to a variable because this column is not matched to the search criteria We still must read this column because columns are read sequentially within a record Once a column is read, the next column is pointed to within the data input stream Next, the second column is read However, the value of the column is assigned to an integer variable because this is the value within the record that is being compared to the search criteria Any errors that occur while reading the data input stream are trapped by the catch {} block where instead of displaying an error message, a boolean false is returned to the enumerateRecords() method indicating that the current record should not be included in the RecordEnumeration The if statement is used to compare the string value of the data input stream to the search criteria If there is a match, a boolean true is returned to the enumerationRecords() method; otherwise, a boolean false is returned. vb.net ean 13 reader .NET EAN - 13 Barcode Reader for C#, VB . NET , ASP.NET Applications
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16 Sep 2008 ... Demonstrates creating EAN - 13 Barcodes with VB . NET . ... programs for hand held devices which came with an integrated barcode reader . // Use this to resolve name-space collisions Box(double width, double height, double depth) { thiswidth = width; thisheight = height; thisdepth = depth; } Accessibility Some browsers do not support CSS Double check whether your target audience s browsers will support the style sheets that you may use To disable Dreamweaver s default CSS feature, choose Edit> Preferences In the General category view, uncheck Use CSS instead of HTML tags A word of caution: The use of this in such a context can sometimes be confusing, and some programmers are careful not to use local variables and formal parameter names that hide instance variables Of course, other programmers believe the contrary that it is a good convention to use the same names for clarity, and use this to overcome the instance variable hiding It is a matter of taste which approach you adopt word pdf 417, birt upc-a, data matrix word 2007, birt ean 13, birt report qr code, birt pdf 417 vb.net ean 13 reader Read Barcodes from Images C#/ VB . NET - BC.NetBarcodeReader ...
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NET EAN - 13 Barcode Reader , Reading EAN - 13 barcode images in .NET, C#, VB . NET , ASP.NET applications. 2 Create instances of classes and assign those instances to references 3 Open a record store and create a new record store if the record store doesn t exist 4 Display any errors that occur when opening/creating a record store 5 Create data in the appropriate data type 6 Convert data to a byte array output stream 7 Create a data output stream using the byte array output stream 8 Write each column of the record to the data output stream 9 Convert the data output stream to a byte array 10 Write the record to the record store 11 Close the output byte array output stream and the data output stream 12 Display any errors that might occur while writing to the record store 13 Create a buffer of bytes sufficient to hold a record 14 Create a byte array input stream and a data input stream 15 Create a Filter class with a method that compares the search criteria to a record and returns a boolean value true or false If true, then include the record in the RecordEnumeration 16 Create an instance of the Filter class and use the instance when creating the RecordEnumeration 17 Loop through the RecordEnumeration, copying each column from the record store to a variable 18 Display the data in a dialog box 19 Display any errors that occur when reading records from the record store 20 Close and remove the RecordEnumeration and the record store vb.net ean 13 reader EAN - 13 VB . NET DLL - KeepAutomation.com
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