SysDirOpen (FUN)

FUNCTION SysDirOpen : RTS_IEC_HANDLE

Opens a specified directory and returns a handle and the first directory entry.

szDirEntry is expected to provide enough space to write the direcory entry to.

In case szDirEntry is 0, the first directory entry may be retrieved with SysDirRead.

InOut:

Scope	Name	Type	Comment
Return	SysDirOpen	RTS_IEC_HANDLE	Returns the runtime system error code (see CmpErrors.library)
Input	szDir	REFERENCE TO STRING	Name of directory. Note Empty string (‘’) is the request for the current working directory.
	szDirEntry	REFERENCE TO STRING	OUT_PARAMETER, optional: Directory entry as string, may be 0
	diMaxDirEntry	DINT	OUT_PARAMETER, optional: Max number of bytes to write in pszDirEntry
	pDirInfo	POINTER TO DirInfo	OUT_PARAMETER, optional: Directory information, may be 0
	pResult	POINTER TO RTS_IEC_RESULT	OUT_PARAMETER: Pointer to runtime system error code (see CmpErrors.library)