barcode print in asp net Fig. 9.58 in VS .NET

Generator Denso QR Bar Code in VS .NET Fig. 9.58

Fig. 9.58
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DATA FILES
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When the program is executed, the Open dialog box appears, as shown in Fig. 9.58. Once data file Teams.dat is selected, the first record is displayed, as shown in Fig. 9.59(a). Any changes to this record can then be entered within the appropriate text box, as shown in Fig. 9.59(b), where the number of losses has been increased from 4 to 5. Clicking on the Update button then causes the new values to be saved to the data file. The next record then appears, as shown in Fig. 9.60. (The user may also click on the Next button, which results in the next record being displayed without saving the values from the previous record.) The process continues until the last record has been processed, resulting in the controls being disabled, as shown in Fig. 9.61.
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Fig. 9.59(a)
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Fig. 9.59(b)
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Fig. 9.60
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Fig. 9.61
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Visual Basic includes two additional library functions, Loc and Seek, which may be useful in programs that process random access data files. The Loc function returns the pointer location (i.e., the record number) of the record last read or last written within the specified file. The pointer location is expressed as a long integer. Similarly, the Seek function returns the current pointer location within the specified file. Again, the pointer location is expressed as a long integer. Table 9.1 summarizes the commonly used file-related functions. 9.6 BINARY FILES Binary files contain information expressed as a stream of consecutive, unformatted bytes. A binary file may represent a graphic, a sound file, or compiled code (i.e., a set of machine language instructions). Applications that make use of binary files are typically complicated very specialized in nature, and hence beyond the scope of this book.
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DATA FILES
Table 9.1 File-Related Library Functions Function
Application
Do While Not EOF(1) . . . . . Loop n = Len(Record) RecNo = Loc(1)
Description
Checks for an end-of-file condition within a specified file. Returns True if an end-of-file has been detected, and False otherwise. Returns the length (in bytes) of the object specified as the argument. Frequently, the argument will represent a record. Returns the pointer location of the last record read or the last record written (whichever is most recent) within the specified file. Returns the length (in bytes) of the specified file. Returns the current pointer location within the specified file.
Len Loc
LOF Seek
n = LOF(1) RecNo = Seek(1)
To open a binary file, we use the Open statement in the following manner.
Open filename For Binary As #n
Get #n, first byte, data item
where first byte is a positive integer that represents the number of the first byte read. If this field is left blank (i.e., if the first byte is not shown), the byte following the last Get # or the last Put # is read. The surrounding commas must be present if first byte is omitted; i.e.,
Get #n, , data item
Information is written to a binary file in the same manner, using the Put # statement. The general form of this statement for a binary file is
Put #n, first byte, data item
where first byte is a positive integer that represents the number of the first byte written. If this field is left blank, the byte following the last Get # or the last Put # is written. The surrounding commas must be present if first byte is omitted; i.e.,
Put #n, , data item
The Get # and/or Put # statements are usually included within a loop, so that the binary file is read and/or written on a consecutive byte-by-byte basis. The following example illustrates the overall process.
EXAMPLE 9.12 READING FROM AND WRITING TO A BINARY FILE
Here is a skeletal outline of a Visual Basic program that reads data from a binary file and later writes to the same binary file, presumably after performing some modification to the information within the file. Graphics and sound editing programs often make use of this overall read/process/write strategy.
where filename represents the file name and n represents the data channel number, as before. Information is read from a binary file as consecutive bytes. To read from a binary file, we again use the Get # statement, though in a slightly different form than that used with random access files. With binary files, the Get # statement is written in general terms as
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