Name
FileLength -- return size of an open file (V3.0)
Synopsis
size = FileLength(id)
Function
This function returns the current size of the file specified by id. The size returned by this function will be up to date with all operations done on this file. For example, you could write to the file and then FileLength() would return the new size of the file.

Please note that FileLength() can also return -1 if it does not know the file's size. This can happen in case the file is read from a streamed source through a file adapter, for example.

Inputs
id
identifier of the file to query
Results
size
current size of this file
Example
OpenFile(1, "test.txt", #MODE_WRITE)
NPrint(FileLength(1))
WriteLine(1, "Hello World.")
NPrint(FileLength(1))
CloseFile(1)
The code above opens file "test.txt" for writing and calls FileLength() twice. The first call will return 0 because the file is empty at that point but the second call will return 13 because some characters have been written to the file now.
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