| filehandle/stream = a valid variable set with the OpenFile, ReadFile command, or OpenTCPStream (v1.52+). The value returned is a text string. |
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Once you've opened a disk file (or stream) for reading, use this command to read a whole line of text from a text file or stream. Each line of text is returned as a string variable. This function can be used to read plain text files.
Characters are read from the input file until an "end-of-line" mark is found. An "end-of-line" can be a single carriage return (0Dh) or a single linefeed (0Ah) or carriage return followed by a linefeed (0Dh, 0Ah). Reading beyond the end of file does not result in an error, but each value read will be a zero length string. ReadLine$ returns all chars except chr$(13)/chr$(10). Streams can only be used in Blitz Basic v1.52 or greater. |
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; Reading and writing a file using ReadLine$ and WriteLine functions
; Initialise some variables for the example String1$ = "Line 1 is short" String2$ = "Line 2 is a longer line but they can be much longer" String3$ = "Line 3 is made up " String4$ = "of two parts joined together." ; Open a file to write to fileout = WriteFile("mydata.txt") ; Write the information to the file WriteLine( fileout, String1 ) WriteLine( fileout, String2 ) WriteLine( fileout, String3 + String4) WriteLine( fileout, "Just to show you don't have to use variables" ) ; Close the file CloseFile( fileout ) ; Open the file to Read filein = ReadFile("mydata.txt") Read1$ = ReadLine$( filein ) Read2$ = ReadLine$( filein ) Read3$ = ReadLine$( filein ) Read4$ = ReadLine$( filein ) ; Close the file once reading is finished CloseFile( filein ) Print "Lines of text read from file - mydata.txt " Print Read1 Print Read2 Print Read3 Print Read4 WaitKey() |