Example String fileRead 002

 

 

Description

This example uses the fileRead function to read a previously written file using the file length to specify what portion of the file to write and a pointer to a new Byte Vector where the portion of the file read is to be written.

 

Details

This Lambda saves the first 20 characters of the file in a Byte Vector.

(defun fileLambda()
regs:((CharPointer:fp) cc)
vars:(fileRecord)
(setq fileID (fileOpen "testReadRecord.txt" 1 0))
(fileWrite fileID {abcdefghijklmnopqrstuvwxyz} )
(fileClose fileID 1)
(setq fileID (fileOpen "testReadRecord.txt" 0 0))
(setq fileRecord (new Vector: Byte: 30))
(setq fp fileRecord)
(fileRead fileID fp 20)
(setq cc fp[0])
(writeln "First character in the file is: " (char cc))
(fileClose fileID 0)
) 		Returns: abcdefghijklmnopqrst

 

Related Examples

Here are examples of the fileRead function at work.

String fileRead 001 String fileRead 002 String fileWrite 001

 

Function Links

Here is the link to the current function used in this example.

fileRead

Here are a number of links to other related functions.

fileReadRecord(#void) fileClose(#void) fileOpen(#void) fileWrite(#void)

 

Argument Types

Here are the links to the data types of the arguments used in this example.

Character String ByteVector

Here are a number of links to examples having similar argument types.

BitVector isType 020 BitVector ref 027 Boolean isType 011 ByteVector compress 001
ByteVector isByteVector 001 ByteVector isCharAlphabetic 003 ByteVector isCharAlphanumeric 003 ByteVector isCharLowercase 003
ByteVector isCharName 003 ByteVector isCharNumeric 003 ByteVector isCharUppercase 003 ByteVector isCharWhitespace 003
ByteVector isObject 013 ByteVector sizeof 020 ByteVector type 022 Character addMethod 013
Character cadd 001 Character ccompareEQ 001 Character ccompareGE 001 Character ccompareGT 001
Character ccompareLE 001 Character ccompareLT 001 Character ccompareNE 001 Character cdiv 001
Character character 001 Character cmod 001 Character cmul 001 Character compare 010
Character compareEQ 010 Character compareGE 010 Character compareGT 010 Character compareLE 010
Character compareLT 010 Character compareNE 010 Character comparison 010 Character csub 001
Character isEqual 008 Character isIdentical 008 Character isType 012 Character setq 017
Character sizeof 010 Character type 012 Context debugBrowsableProcs 001 Context disassemble 001
Date hour 001 Date isDate 001 Date isType 014 Date julian 001
Date minute 001 Date month 001 Date second 001 Date time 001
Date time 002 Date year 001 Dictionary isDictionary 001 Dictionary isType 006
Dictionary new 004 Directory isType 007 Directory new 005 Directory ref 010
Directory ref 012 Error error 001 Error errorTrap 001 Error isError 001
Error onError 001 FileIO closeLog 001 FltVector isType 016 FltVector ref 022
Function isType 015 IntVector isType 017 IntVector ref 023 Lambda balance 001
Lambda debugBrowsableProcs 001 Lambda defchild 001 Lambda define 001 Lambda deforphan 001
Lambda defriend 001 Lambda defun 001 Lambda defun 002 Lambda disassemble 001
Lambda ref 017 Matrix isType 009 Matrix ref 015 Matrix ref 016
NumMatrix isType 022 NumMatrix ref 035 NumVector isType 018 NumVector ref 024
Number isType 013 ObjVector isType 019 ObjVector ref 025 PcodeVector ref 026
ShortVector isType 018 ShortVector ref 024 String addMethod 001 String append 001
String append 002 String clean 001 String code 001 String compare 001
String compareEQ 001 String compareGE 001 String compareGT 001 String compareLE 001
String compareLT 001 String compareNE 001 String comparison functions 001 String defMethod 001
String defMethod 002 String downcase 001 String fileRead 001 String fileRead 002
String fileReadRecord 001 String fileWrite 001 String find 001 String find 002
String hashString 001 String isChar 001 String isCharAlphabetic 001 String isCharAlphanumeric 001
String isCharLowercase 001 String isCharName 001 String isCharNumeric 001 String isCharUppercase 001
String isCharWhitespace 001 String isEqual 001 String isEqual 002 String isObject 001
String isString 001 String isText 001 String isType 001 String isType 002
String isType 003 String left 001 String length 001 String length 002
String methodsOf 001 String methodsOf 002 String methodsOf 003 String mid 001
String new 001 String parse 001 String ref 001 String ref 002
String replace 001 String rept 001 String right 001 String send 001
String sizeof 001 String string 001 String string 002 String string 003
String stringCiEQ 001 String stringCiGE 001 String stringCiGT 001 String stringCiLE 001
String stringCiLT 001 String stringCiNE 001 String stringFill 001 String stringToBVector 001
String stringToBVector 002 String stringToBVector 003 String stringToVector 001 String stringToVector 002
String stringToVector 003 String stringToVector 004 String substitute 001 String substitute 002
String substring 001 String substring 002 String substringCiEQ 001 String substringCiGE 001
String substringCiGT 001 String substringCiLE 001 String substringCiLT 001 String substringCiNE 001
String text 001 String trim 001 String type 001 String upcase 001
String upcase 002 String upcase 003 Structure apply 002 Structure ref 004
Structure setq 003 Structure setq 004 Structure setq 005 Structure setq 006
Symbol *< 001 Symbol +< 001 Symbol -< 001 Symbol /< 001
Symbol downcase 002 Symbol isCharAlphabetic 002 Symbol isCharAlphanumeric 002 Symbol isCharLowercase 002
Symbol isCharName 002 Symbol isCharNumeric 002 Symbol isCharUppercase 002 Symbol isCharWhitespace 002
Symbol isObject 002 Symbol isSymbol 001 Symbol isType 004 Symbol length 003
Symbol makeQuotedSymbol 001 Symbol send 002 Symbol sizeof 002 Symbol symbol 001
Symbol symbol 002 Symbol type 002 Vector isType 008 Vector ref 013
Vector ref 014 Void isType 010 Void ref 017 substringEQ 001
substringFill 001 substringGE 001 substringGT 001 substringLE 001
substringLT 001 substringNE 001

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