FileGetSize

Retrieves the size of a file.

FileGetSize, OutputVar [, Filename, Units]

Parameters

OutputVar	The name of the variable in which to store the retrieved size (rounded down to the nearest whole number).
Filename	The name of the target file, which is assumed to be in %A_WorkingDir% if an absolute path isn't specified. If omitted, the current file of the innermost enclosing File-Loop will be used instead.
Units	If present, this parameter causes the result to be returned in units other than bytes: K = kilobytes M = megabytes

ErrorLevel

ErrorLevel is set to 1 if there was a problem or 0 otherwise.

Remarks

Files over 4 gigabytes in size are supported (even if Units is bytes).

If the target file is a directory, the size will be reported as whatever the OS believes it to be (probably zero in all cases).

To calculate the size of folder, including all its files, follow this example:

SetBatchLines, -1  ; Make the operation run at maximum speed.
FolderSize = 0
FileSelectFolder, WhichFolder  ; Ask the user to pick a folder.
Loop, %WhichFolder%\*.*, , 1
	FolderSize += %A_LoopFileSize%
MsgBox Size of %WhichFolder% is %FolderSize% bytes.

Example

FileGetSize, size, C:\My Documents\test.doc ; Retrieve the size in bytes.
FileGetSize, size, C:\My Documents\test.doc, K ; Retrieve the size in Kbytes.