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93 lines
3.5 KiB
Plaintext
93 lines
3.5 KiB
Plaintext
The '''PUT #''' file or port statement writes data to a specific byte or record location.
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{{PageSyntax}}
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:: '''PUT #''filenumber&'',''' [''position''][, {''holdingvariable''|''holdingarray()''}]
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* File/port number is the number used in the [[OPEN]] statement.
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* The [[INTEGER]] or [[LONG]] file byte ''position'' in a [[BINARY]] file or the record ''position'' in a [[RANDOM]] file '''must be greater than zero'''.
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* The file byte or record ''position'' can be omitted if the [[PUT]] or [[GET]] is consecutive or when creating new file data sequentially.
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* The ''holding variable'' [[TYPE|type]] determines byte size and the next byte position in the file when the ''position'' is ommitted.
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* The first byte or record position is 1. This may require adding one to an offset value when documentation uses that position as 0.
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* Both the file ''position'' and ''holding variable''(and comma) can be omitted when using a [[FIELD]] definition.
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* If a [[LEN]] = record length statement is omitted in an [[OPEN]] FOR [[RANDOM]] statement the record size defaults to 128 bytes!
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* '''Warning: Not designating a PUT position can overwrite previous file data based on the current file ''position''!'''
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* When using a numeric ''holding variable'', values do NOT require conversion using [[MKI$]], [[MKL$]], [[MKS$]] or [[MKD$]].
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* '''QB64''' can load [[Arrays|array]] data directly(brackets required) to a [[BINARY]] file using '''one''' PUT to a [[BINARY]] file: '''{{text|PUT #1, , array()|green}}'''
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''Example 1:'' Using a [[TYPE]] record variable(Contact) to enter a new [[RANDOM]] record to a file.
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{{CodeStart}} '' ''
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{{Cl|TYPE}} ContactType
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first {{Cl|AS}} {{Cl|STRING}} * 10
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last {{Cl|AS}} {{Cl|STRING}} * 20
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age {{Cl|AS}} {{Cl|INTEGER}}
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{{Cl|END}} {{Cl|TYPE}}
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{{Cl|DIM}} Contact {{Cl|AS}} ContactType
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{{Cl|INPUT}} "Enter a first name: ", Contact.first
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{{Cl|INPUT}} "Enter a last name: ", Contact.last
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{{Cl|INPUT}} "Enter an age: ", Contact.age
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{{Cl|OPEN}} "Record.lst" {{Cl|FOR...NEXT|FOR}} {{Cl|RANDOM}} {{Cl|AS}} #1 {{Cl|LEN}} = {{Cl|LEN}}(Contact)
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NumRecords% = {{Cl|LOF}}(1) \ {{Cl|LEN}}(Contact)
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{{Cl|PRINT}} NumRecords%; "previous records"
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{{Cl|PUT}} #1, NumRecords% + 1, Contact ' add a new record {{Cl|TYPE}} record value
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{{Cl|CLOSE}} #1 '' ''
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{{CodeEnd}}
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: ''Note:'' The DOT record variable values were created or changed before the PUT. The record length is 32 bytes.
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''Example 2:'' Placing the contents of a numerical array into a [[BINARY]] file. You may want to put the array size at the beginning too.
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{{CodeStart}} '' ''
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{{Cl|DIM}} {{Cl|SHARED}} array(100) {{Cl|AS}} {{Cl|INTEGER}}
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{{Cl|FOR...NEXT|FOR}} i = 1 {{Cl|TO}} 100
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array(i) = i
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{{Cl|NEXT}}
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showme 'display array contents
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{{Cl|OPEN}} "BINFILE.BIN" {{Cl|FOR...NEXT|FOR}} {{Cl|BINARY}} {{Cl|AS}} #1
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{{Cl|PUT}} #1, , array()
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{{Cl|ERASE}} array 'clear element values from array and display empty
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showme
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{{Cl|CLOSE}} #1
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{{Cl|OPEN}} "BINFILE.BIN" {{Cl|FOR...NEXT|FOR}} {{Cl|BINARY}} {{Cl|AS}} #2
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{{Cl|GET}} #2, , array()
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{{Cl|CLOSE}} #2
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showme 'display array after transfer from file
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{{Cl|END}}
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{{Cl|SUB}} showme
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{{Cl|FOR...NEXT|FOR}} i = 1 {{Cl|TO}} 100
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{{Cl|PRINT}} array(i);
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{{Cl|NEXT}}
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{{Cl|PRINT}} "done"
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{{Cl|END SUB}} '' ''
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{{CodeEnd}}
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: ''Note:'' Use empty brackets in QB64 when using [[GET]] to create an array or [[PUT]] to create a [[BINARY]] data file.
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''See Example:'' [[Program ScreenShots]]
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''See also:''
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* [[GET|GET #]]
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* [[SEEK]], [[SEEK (statement)]]
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* [[PRINT (file statement)|PRINT #]]
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* [[FIELD]]
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* [[PUT (graphics statement)]]
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* [[PUT (TCP/IP statement)]]
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{{PageNavigation}}
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