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43 lines
1.7 KiB
Text
43 lines
1.7 KiB
Text
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The '''LINE INPUT #''' file statement reads an entire file line as one string variable value.
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{{PageSyntax}}
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:: LINE INPUT #filenumber%, linereturn$
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* Reads a file using the filenumber [[OPEN]]ed in the [[INPUT (file mode)]] as one file string value.
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* Returns [[STRING]] values so it must use one string variable.
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* Can be used with [[EOF]] to count the number of lines of data (records) in a file using a loop.
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* Use the [[EOF]] function to avoid going past the end of a file and creating an error.
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* LINE INPUT # can even retain the original quotation marks in text.
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* '''NOTE: If QB64 or QB 4.5 give "Input past End of file" errors, check for CHR$(26) in the files being read!'''
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* '''Warning! Files must exist to open them in INPUT mode! Use [[_FILEEXISTS]] to avoid program [[ERROR Codes|errors]]!'''
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''Example:'' Finding the number of filenames listed in a file to dimension an array to hold them.
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{{CodeStart}} '' ''
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{{Cl|REDIM}} FileArray$(100) 'create {{Cl|$DYNAMIC|dynamic}} array
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{{Cl|SHELL}} {{Cl|_HIDE}} "DIR /B *.* > D0S-DATA.INF"
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{{Cl|IF...THEN|IF}} {{Cl|_FILEEXISTS}}("D0S-DATA.INF") THEN
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{{Cl|OPEN}} "D0S-DATA.INF" FOR {{Cl|INPUT (file mode)|INPUT}} AS #1
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DO UNTIL {{Cl|EOF}}(1)
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{{Cl|LINE INPUT}} #1, file$ 'read entire text file line
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filecount% = filecount% + 1
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LOOP
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{{Cl|CLOSE}} #1
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{{Cl|END IF}}
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{{Cl|REDIM}} FileArray$(filecount%)
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{{Cl|PRINT}} filecount% '' ''
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{{CodeEnd}}
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''See also:''
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* [[INPUT (file mode)]], [[INPUT (file statement)|INPUT #]], [[INPUT$]] {{text|(file input)}}
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* [[INPUT]], [[LINE INPUT]], [[INPUT$]] {{text|(keyboard input)}}
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* [[_FILEEXISTS]], [[_DIREXISTS]]
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* [[FILELIST$]] (Function replacement for [[FILES]])
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{{PageNavigation}}
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