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THE HYPERCARD CENTER |
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Note: This is a work in progress and many formatting issues have been fixed. Read more about the project on the home page.
readread from file fileName [at [-] ¬ integer] {for posInteger | until char}
The read command reads data from a file. (You must have already opened the file with the open file command.) Read places the data into the local variable it. Reading of a newly opened file starts from the beginning of the file, or optionally at character integer. If you use the form at -integer, reading starts at integer characters from the end of the file. Subsequent reads continue from the last point read. Read continues until it has read the specified number of characters or it reaches the named ASCII character (which can be specified as a constant: colon, comma, end, eof, formfeed, quote, return, space, or tab).
All characters count as data, including return characters at the end of lines, spaces, and tab characters. Examplesread from file "Data" until Z -- read until first Z read from file "Data" until tab read from file "Data" until return -- read one line read from file "Data" until end -- read until the end of the file read from file "Data" for 100 -- read 100 bytes read from file "Data" at 200 for 100 -- read 100 bytes ¬ starting at the 200th character in the file read from file "Data" at -200 for 100 -- read 100 bytes ¬ starting at the 200th character from the end of the file read from file "My Data" -- This function asks for the name of a text file and reads it. -- You might use it as follows: -- put readFile() into myInfo -- Note that variables can hold unlimited amounts of information -- while fields can only hold 30k. function readFile answer file "Read what text file?" of type text if (it is empty) or (it is "Cancel") then return empty put it into theFileName open file theFileName repeat forever read from file theFileName for 16384 if it is empty then exit repeat put it after theData end repeat close file theFileName return theData end readFile
Related Topics Placeholders
fileNameAn expression that evaluates to a text string that is also a valid Macintosh filename. For example: "my stack" "HD20:Wally's Stacks:my stack" "my file alias"
integerAn expression that evaluates to a positive or negative integer or to zero. For example: 3 18 - 100 -(3 * sum(1,3,4,5)) + 39
In AppleScript, integer is a value class. posIntegerAn expression that evaluates to a positive integer. For example: 3 67 mod 13 the number of bg fields the number of backgrounds the number of cards div 2
See also: background, bkgnd, button, card, chunk, field, menu, and menuItem charAn expression that yields a single character. For example: "a" return tab numToChar(13)
HyperTalk Reference
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