Read an existing record from a logical file
|
WSupported on Windows
|
USupported on Unix
|
VSupported on OpenVMS
|
NSupported in Synergy .NET
|
xcall FS_READ(record, number, [level], [channel][, error])
Arguments
record
Returned with the record read. (a)
number
The number of the record to read. (n)
level
(optional) The file-stack level from which to read. (n)
channel
(optional) The file-stack channel. If not passed, the default file-stack channel is used. (n)
error
(optional) Returned with one of the following error flags: (n)
0 = No error occurred.
1 = Not a file-stack channel.
2 = File stack not active.
4 = No logical file stacked.
5 = Illegal record number.
6 = Invalid file-stack level.
Discussion
FS_READ reads a record that exists in a logical file.
If error is not passed and an error occurs, a fatal program error is generated.
It is assumed that the size of the data transfer is the size of the accessed logical file’s record length, as specified in FS_OPEN.
Examples
This example reads the data stored in record 3 of the current level of the default file-stack into page. Any error will be returned in sts.
xcall fs_read(page, 3,,, sts)
