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29 lines
861 B
Markdown
29 lines
861 B
Markdown
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The [LOF](LOF) function is used to find the length of an [OPEN](OPEN) file in bytes.
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## Syntax
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> *totalBytes&* = [LOF](LOF)([#]fileNumber)
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## Description
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* LOF returns the number of bytes in an [OPEN](OPEN)ed designated fileNumber. File is empty if it returns 0.
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* fileNumber is the number of the opened file. **#** is not required.
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* Often used to determine the number of records in a [RANDOM](RANDOM) access file.
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* Can also be used to avoid reading an empty file, which would create an error.
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* LOF in **QB64** can return up to 9 GB (9,223,372,036 bytes) file sizes.
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## Example(s)
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Finding the number of records in a RANDOM file using a [TYPE](TYPE) variable.
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```vb
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OPEN file$ FOR RANDOM AS #1 LEN = LEN(Type_variable)
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NumRecords% = LOF(1) \ RecordLEN%
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```
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## See Also
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* [LEN](LEN), [EOF](EOF), [BINARY](BINARY), [RANDOM](RANDOM), [TYPE](TYPE)
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