Example: File search (FB_EnumFindFileEntry, FB_EnumFindFileList)
Here you can unpack the complete sources: Sample02.zip
Example FB_EnumFindFileEntry:
In the local TwinCAT system all files should be listed in the following directory: C:\Windows\system32\. The file names should be written as messages into the TwinCAT System Manager logger output. It should be possible to cancel this process.
PROGRAM P_TestEnumEntry
VAR
fbEnum : FB_EnumFindFileEntry := ( sNetID := '', tTimeout := T#5s, sPathName := 'C:\Windows\System32\*.*' );
bEnum : BOOL;
bAbort : BOOL;
nState : BYTE;
END_VAR
The listing of the found files begins with a rising edge at the bEnum variable. The process is canceled with a rising edge at the bAbort variable.
CASE nState OF
0:
IF bEnum THEN (* flag set ? *)
bEnum := FALSE; (* reset flag *)
fbEnum.eCmd := eEnumCmd_First; (* enum first entry *)
nState := 1;
END_IF
1: (* enum one entry *)
IF bAbort THEN
bAbort := FALSE;
fbEnum.eCmd := eEnumCmd_Abort;
END_IF
fbEnum( bExecute := FALSE );
fbEnum( bExecute := TRUE );
nState := 2;
2: (* wait until function block not busy *)
fbEnum( bExecute := FALSE );
IF NOT fbEnum.bBusy THEN
IF NOT fbEnum.bError THEN
IF NOT fbEnum.bEOE THEN
ADSLOGSTR( ADSLOG_MSGTYPE_HINT OR ADSLOG_MSGTYPE_LOG, 'FB_EnumFindFileEntry, find file name: %s', fbEnum.stFindFile.sFileName );
fbEnum.eCmd := eEnumCmd_Next; (* enum next entry *)
nState := 1;
ELSE (* no more entries *)
nState := 0;
END_IF
ELSE (* log error *)
ADSLOGSTR( ADSLOG_MSGTYPE_ERROR OR ADSLOG_MSGTYPE_LOG, 'FB_EnumFindFileEntry error:%s', DWORD_TO_HEXSTR( fbEnum.nErrID, 0, FALSE ) );
nState := 0;
END_IF
END_IF
END_CASE
Log messages in the TwinCAT System Manager logger output:

Example FB_EnumFindFileList:
PROGRAM P_TestEnumList
VAR
fbEnum : FB_EnumFindFileList;
filesList : ARRAY[1..10] OF ST_FindFileEntry;
bFirst : BOOL;
bNext : BOOL;
bAbort : BOOL;
bBusy : BOOL;
bError : BOOL;
nErrID : UDINT;
bEOE : BOOL;
nFindFiles : UDINT;
END_VAR
Online view:
