9.206 STM_FILE_READ
Note: Built-In Function Rules Usage Options
This Built-In function reads data from the specified stream file. The stream file was previously opened by a STM_FILE_OPEN.
If the stream file was opened with a LineTerminator option, then data up to the specified line terminator will be return by a STM_FILE_READ action.
If the stream file was opened with a LineTerminator=NONE option, then as much data as will fit in the provided Returned Data Blocks will be return by the STM_FILE_READ action.
Related Built-In Functions: STM_FILE_OPEN, STM_FILE_CLOSE, STM_FILE_WRITE, STM_FILE_WRITE_CTL. Refer to 9.205 STM_FILE_OPEN for the Line Terminators used.
Arguments
|
No
|
Type
|
Req/ Opt
|
Description
|
Min Len
|
Max Len
|
Min Dec
|
Max Dec
|
|
1
|
N
|
Req
|
File number (file handle) of the file from which data is to be read.
This number was allocated to the stream file by the STM_FILE_OPEN.
|
1
|
3
|
0
|
0
|
|
Return Values
|
No
|
Type
|
Req/ Opt
|
Description
|
Min Len
|
Max Len
|
Min Dec
|
Max Dec
|
|
1
|
A
|
Req
|
Returned data block 1
Data will be returned up to the length of this data block
|
1
|
Unlimited
|
|
|
|
2
|
A
|
Opt
|
Return Code
OK = Data has been read and returned.
If a Line Terminator was specified on the open, data up to the nominated terminator would have been returned.
If Lineterminator=NONE was specified on the open, data would have been returned in the Data Blocks provided.
OV = Data overflow.
A Line Terminator was specified on the open and as much data as will fit in the Data Blocks has been returned, however, more data exists to reach the nominated terminator for this line. The subsequent STM_FILE_READ will return the further data from this line up to the nominated terminator.
EF = End of file encountered.
A read was attempted but no more data is available. The Returned Data Block/s will be returned blank.
ER = Error occurred.
|
2
|
2
|
|
|
|
3
|
A
|
Opt
|
Returned data block 2
|
1
|
Unlimited
|
|
|
|
4
|
A
|
Opt
|
Returned data block 3
|
1
|
Unlimited
|
|
|
|
5
|
A
|
Opt
|
Returned data block 4
|
1
|
Unlimited
|
|
|
|
6
|
A
|
Opt
|
Returned data block 5
|
1
|
Unlimited
|
|
|
|
7
|
A
|
Opt
|
Returned data block 6
|
1
|
Unlimited
|
|
|
|
8
|
A
|
Opt
|
Returned data block 7
|
1
|
Unlimited
|
|
|
|
9
|
A
|
Opt
|
Returned data block 8
|
1
|
Unlimited
|
|
|
|
10
|
A
|
Opt
|
Returned data block 9
|
1
|
Unlimited
|
|
|
|
11
|
A
|
Opt
|
Returned data block 10
|
1
|
Unlimited
|
|
|
|
Example
Refer to 9.205 STM_FILE_OPEN.
