mirror of
https://github.com/QB64Official/qb64.git
synced 2024-09-16 03:54:01 +00:00
b586eafd3b
LINE INPUT will now use the faster method if passed a file handle that has been opened FOR BINARY. As such, the _BLINEINPUT command has been removed. qb64.bas now takes advantage of this for reading from '$include files, at least in Include Manager 1. Some tweaking of internal/source/main.txt was required to get things into a sane state, so I'm holing off changing the compiler any further so the auto-builder can make sure everything's smoothed over. Note: Everything should still compile as normal; I'm just being overcautious.
31 lines
No EOL
874 B
Text
31 lines
No EOL
874 B
Text
The '''LOF''' Function is used to find the length of an [[OPEN]] file in bytes.
|
|
|
|
|
|
|
|
{{PageSyntax}}
|
|
:: bytes% = LOF(filenumber%)
|
|
|
|
|
|
* LOF returns the number of bytes in an OPENed designated filenumber. File is empty if it returns 0.
|
|
* Filenumber is the number of the opened file. # is not required.
|
|
* Often used to determine the number of records in a [[RANDOM]] access file.
|
|
* Can also be used to avoid reading an empty file, which would create an error.
|
|
* LOF in '''QB64''' can return up to 9223372036 gigabyte file sizes.
|
|
|
|
|
|
''Example:'' Finding the number of records in a RANDOM file using a [[TYPE]] variable.
|
|
|
|
{{CodeStart}}
|
|
OPEN file$ FOR RANDOM AS #1 LEN = {{Cl|LEN}}(Type_variable)
|
|
NumRecords% = {{Cl|LOF}}(1) \ RecordLEN%
|
|
{{CodeEnd}}
|
|
|
|
|
|
''See Example:'' [[INPUT (file mode)]]
|
|
|
|
|
|
''See also:''
|
|
* [[LEN]], [[EOF]], [[BINARY]], [[RANDOM]], [[TYPE]]
|
|
|
|
|
|
{{PageNavigation}} |