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Encoding QR Code in C#.NET PART I

PART I
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Part I:
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The C# Language
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item = dataInReadString(); onhand = dataInReadInt32(); cost = dataInReadDouble(); // See if the item matches the one requested // If so, display information if(itemEquals(what, StringComparisonOrdinalIgnoreCase)) { ConsoleWriteLine(onhand + " " + item + " on hand " + "Cost: {0:C} each", cost); ConsoleWriteLine("Total value of {0}: {1:C}" , item, cost * onhand); break; } } } catch(EndOfStreamException) { ConsoleWriteLine("Item not found"); } catch(IOException exc) { ConsoleWriteLine("Error Reading Inventory File"); ConsoleWriteLine("Reason: " + excMessage); } finally { dataInClose(); } } }
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Enter item to look up: Screwdrivers 18 Screwdrivers on hand Cost: $150 each Total value of Screwdrivers: $2700
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In the program, notice how inventory information is stored in its binary format Thus, the number of items on hand and the cost are stored using their binary format rather than their human-readable text-based equivalents This makes it is possible to perform computations on the numeric data without having to convert it from its human-readable form There is one other point of interest in the inventory program Notice how the end of the file is detected Since the binary input methods throw an EndOfStreamException when the end of the stream is reached, the program simply reads the file until either it finds the desired item or this exception is generated Thus, no special mechanism is needed to detect the end of the file
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Up to this point, we have been using sequential files, which are files that are accessed in a strictly linear fashion, one byte after another However, you can also access the contents of a file in random order One way to do this is to use the Seek( ) method defined by FileStream This method allows you to set the file position indicator (also called the file pointer or simply the current position) to any point within a file
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14:
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Using I/O
The method Seek( ) is shown here: long Seek(long offset, SeekOrigin origin)
PART I
Here, offset specifies the new position, in bytes, of the file pointer from the location specified by origin The origin will be one of these values, which are defined by the SeekOrigin enumeration:
Value SeekOriginBegin SeekOriginCurrent SeekOriginEnd Meaning Seek from the beginning of the file Seek from the current location Seek from the end of the file
After a call to Seek( ), the next read or write operation will occur at the new file position The new position is returned If an error occurs while seeking, an IOException is thrown If the underlying stream does not support position requests, a NotSupportedException is thrown Other exceptions are possible Here is an example that demonstrates random access I/O It writes the uppercase alphabet to a file and then reads it back in non-sequential order
// Demonstrate random access using System; using SystemIO; class RandomAccessDemo { static void Main() { FileStream f = null; char ch; try { f = new FileStream("randomdat", FileModeCreate); // Write the alphabet for(int i=0; i < 26; i++) fWriteByte((byte)('A'+i)); // Now, read back specific values fSeek(0, SeekOriginBegin); // seek to first byte ch = (char) fReadByte(); ConsoleWriteLine("First value is " + ch); fSeek(1, SeekOriginBegin); // seek to second byte ch = (char) fReadByte(); ConsoleWriteLine("Second value is " + ch); fSeek(4, SeekOriginBegin); // seek to 5th byte ch = (char) fReadByte(); ConsoleWriteLine("Fifth value is " + ch); ConsoleWriteLine();
Part I:
The C# Language
// Now, read every other value ConsoleWriteLine("Here is every other value: "); for(int i=0; i < 26; i += 2) { fSeek(i, SeekOriginBegin); // seek to ith character ch = (char) fReadByte(); ConsoleWrite(ch + " "); } } catch(IOException exc) { ConsoleWriteLine("I/O Error\n" + excMessage); } finally { if(f != null) fClose(); } ConsoleWriteLine(); } }
The output from the program is shown here:
First value is A Second value is B Fifth value is E Here is every other value: A C E G I K M O Q S U W Y
Although Seek( ) offers the greatest flexibility, there is another way to set the current file position You can use the Position property As shown previously in Table 14-2, Position is a read/write property Therefore, you can use it to obtain the current position, or to set the current position For example, here is the code sequence from the preceding program that reads every other letter from the file, rewritten to use the Position property:
ConsoleWriteLine("Here is every other value: "); for(int i=0; i < 26; i += 2) { fPosition = i; // seek to ith character via Position ch = (char) fReadByte(); ConsoleWrite(ch + " "); }
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