6-10 Performing File Access Library (FAL) Operations
Hitachi USP V Cross-OS File Exchange User’s Guide
2. datasetError = datasetFindNextFile (datasetHandle, &ffd)
The datasetFindNextFile function acquires the attribute information for
the next dataset in the volume specified by datasetHandle and returns
the data into ffd. This function can be repeated until “no dataset found” is
returned, or until the user application determines that no more information
is needed.
Table 6-8 shows the datasetFindNextFile arguments and
return values.
Table 6-8 DatasetFindNextFile Function
Item Value Type Description
Argument
datasetHandle
ffd
DATASET_HANDLE
DATASET_FIND_DATA
The datasetHandle value returned by the preceding
datasetFindFirstFile function.
Area where the dataset attribute information is stored.
Return value
0
-1
Normal end
Error end, or no dataset found
When the datasetFindNextFile function terminates successfully, it returns
a value of 0. If this function terminates unsuccessfully, it returns a value of
-1. To get the error code information, execute the datasetGetLastError
function (see section
Acquiring Error Information). For example, when the
datasetFindNextFile function cannot find the next dataset in the VTOC,
the datasetGetLastError function will return
DATASET_ERROR_END_OF_VTOC.
The datasetFindNextFile function has the following restrictions:
– The datasetFindNextFile function cannot be used on an open dataset.
Use this function before opening or after closing the dataset.
– After a dataset has been accessed by the datasetFindNextFile function,
the dataset cannot be opened until after the datasetFindClose function
is called.
– The datasetFindFirstFile function must be called prior to
datasetFindNextFile.
3. datasetError = datasetFindClose (datasetHandle)
The datasetFindClose function terminates the acquisition of attribute
information by the datasetFindFirstFile and datasetFindNextFile
functions and closes the dataset. The datasetFindFirstFile function must
be called prior to datasetFindClose.
Table 6-9 shows the
datasetFindClose arguments and return values.
Table 6-9 DatasetFindClose Function
Item Value Type Description
Argument datasetHandle DATASET_HANDLE The datasetHandle value returned by the preceding
datasetFindFirstFile function.
Return value 0
Normal end
