XDF_GET_CHANNEL(3) xdffileio library manual XDF_GET_CHANNEL(3)NAME
xdf_get_channel - Get the channel descriptor handle of a particular index
SYNOPSIS
#include <xdfio.h>
struct xdfch* xdf_get_channel(const struct xdf* xdf,
unsigned int index);
DESCRIPTION
xdf_get_channel() gets the channel descriptor of the channel stored at index index in the XDF file referenced by the handle xdf.
RETURN VALUE
xdf_get_channel() returns the handle to requested channel descriptor in case of success, NULL otherwise.
ERRORS
EINVAL xdf is NULL or index is bigger than the number of channel.
SEE ALSO xdf_add_channel(3)EPFL 2010 XDF_GET_CHANNEL(3)
Check Out this Related Man Page
XDF_ADD_CHANNEL(3) xdffileio library manual XDF_ADD_CHANNEL(3)NAME
xdf_add_channel - Appends a channel to a XDF file
SYNOPSIS
#include <xdfio.h>
struct xdfch* xdf_add_channel(struct xdf* xdf, const char* label);
DESCRIPTION
xdf_add_channel() appends a channel to the file referenced by the handle xdf. The new channel is initialized with the label argument (if
not NULL) and with the default channel values set in the XDF file, i.e. those set using channel configuration fields in xdf_set_conf(3)
(See the related manpage).
If the call to xdf_add_channel(3) is successful, the default offset value (the field referenced by XDF_CF_ARROFFSET) is incremented by the
size of the current default stored type (field referenced by XDF_CF_STOTYPE). As a consequence, if the channel default values have not
changed in-between, the next call to xdf_add_channel() will create a channel whose location is the array will be next to the previous one.
This type of initialization allows the user to add channels without having to specifically pack them: this is achieved by default.
RETURN VALUE
xdf_add_channel() returns the handle to newly created channel descriptor in case of success. Otherwise NULL is returned and errno is set
appropriately.
ERRORS
EINVAL xdf is NULL.
ENOMEM The system is unable to allocate resources.
EPERM the file referenced by xdf has been opened with the mode XDF_READ
SEE ALSO xdf_copy_chconf(3), xdf_set_conf(3), xdf_set_chconf(3)EPFL 2010 XDF_ADD_CHANNEL(3)
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