Libraries > CT File Access > Function Blocks

This function block reads the file, which was previously opened via File.Open. If less characters can be read than specified in ”szBuffer”, the function block returns an active ”xDone” and indicates the current number of characters in ”szSize”. The size of the target memory structure for the bytes to be read and the number of bytes to be read will not be checked.

Inputs:

xExecute	BOOL
xAbort	BOOL
udiTimeOut	UDINT
hFile	CAA.HANDLE	File handle
pBuffer	CAA.PVOID	The address from where the data can be obtained, can be determined with the help of operator ADR.
szSize	CAA.SIZE	Number of bytes to be written (can be determined via operator SIZEOF)

Outputs:

xDone	BOOL
xBusy	BOOL
xError	BOOL
xAborted	BOOL
eError	FILE.ERROR	Error ID
szSize	CAA.SIZE	Current number of successfully read bytes; this value is already valid before xDone has been set

File.Read

File.Read