data matrix reader .net Reading Byte Ranges from a File in VS .NET

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65 Reading Byte Ranges from a File
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Write a custom function encapsulating a combination of fseek(), ftell(), and fgetc() calls:
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< php // function to get an arbitrary number of bytes // from a file function getBytes($file, $startByte, $endByte) { // check for valid range endpoints if ($endByte < $startByte) { die("Ending byte number must be greater than or equal to starting byte number!"); } // open the file for reading $fp = fopen($file, "rb") or die("Cannot open file"); // seek to starting byte // retrieve data by character // until ending byte fseek ($fp, $startByte, SEEK_SET); while (!(ftell($fp) > $endByte)) { $data = fgetc($fp); }
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// close the file fclose($fp) or die ("Cannot close file"); // return data to caller return $data; } // return first 10 bytes of file echo getBytes("fortunestxt", 0, 9); >
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The user-defined getBytes() function is similar to the getLines() function illustrated in the first listing in 64: Reading Line Ranges from a File, with the primary difference lying in its use of fgetc() instead of fgets()The function accepts three arguments: a file path, a starting byte number, and an ending byte number It then sets the internal file pointer to the starting byte value and loops over the file character by character, appending the result at each stage to a variable, until the ending byte value is reached The variable containing the saved bytes is then returned to the caller as a string
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66 Counting Lines, Words, and Characters in a File
Problem
You want to count the number of lines, words, and characters in a file
Solution
Use PHP s file_get_contents(), strlen(), and str_word_count() functions to count words and characters in a file:
< php // set file name and path $file = "dummytxt";
6: Working with Files and Directories
// read file contents into string $str = file_get_contents($file) or die ("Cannot read from file"); // read file contents into array $arr = file ($file) or die ("Cannot read from file"); // count lines echo "Counted " sizeof($arr) " line(s)\n"; // count characters, with spaces $numCharsSpaces = strlen($str); echo "Counted $numCharsSpaces character(s) with spaces\n"; // count characters, without spaces $newStr = ereg_replace('[[:space:]]+', '', $str); $numChars = strlen($newStr); echo "Counted $numChars character(s) without spaces\n"; // count words $numWords = str_word_count($str); echo "Counted $numWords words\n"; >
Comments
It s fairly easy to count the number of lines in a file simply read the file into an array with file(), which stores each line as an individual array element, and then count the total number of elements in the array Counting words and characters is a little more involved, and requires you to first read the file into a string with a function such as file_get_contents() The number of words and characters (including spaces) can then be obtained by running the str_word_count() and strlen() functions on the string To obtain the number of characters excluding spaces, simple remove all spaces from the string with ereg_replace() and then obtain the size of the string with strlen() You can read more about how this works in the listing in 14: Removing Whitespace from Strings, and users whose PHP builds don t support the relativelynewer str_word_count() function will find an alternative way of counting words in the listing in 113: Counting Words in a String
PHP Programming Solutions
67 Writing Files
Problem
You want to write a string to a file
Solution
Use the file_put_contents() function:
< php // define string to write $data = "All the world's a stage\r\nAnd all the men and women merely players"; // write string to file file_put_contents('shakespearetxt', $data) or die("Cannot write to file"); echo "File successfully written"; >
Comments
The file_put_contents() function provides an easy way to write data to a file The file will be created if it does not already exist, and overwritten if it does The return value of the function is the number of bytes written
To have file_put_contents() append to an existing file rather than overwrite it completely, add the optional FILE_APPEND flag to the function call as its third argument If you re using an older PHP build that lacks the file_put_contents() function, you can use the fwrite() function to write to a file instead Here s how:
< php // define string to write $data = "All the world's a stage\r\nAnd all the men and women merely players"; // open file $fp = fopen('shakespearetxt', "wb+") or die ("Cannot open file");
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