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int ff_findnext( FF_FindData_t *pxFindData );
Finds the next file or directory within an embedded FAT file system directory. ff_findnext() can only be called after first calling ff_findfirst(). ff_findfirst() finds the first file in the directory, ff_findnext() then finds all subsequent files in the directory.
The same instance of the FF_FindData_t object must be passed into ff_findnext() as was passed into ff_findfirst().
FF_FindData_t contains the fields shown in the table below:
Parameters:
If a file or directory was found then 0 is returned. If an error occurs a non-zero value is returned.
Example usage:
void DIRCommand( const char *pcDirectoryToScan )
{
FF_FindData_t *pxFindStruct;
const char *pcAttrib;
*pcWritableFile = "writable file",
*pcReadOnlyFile = "read only file",
*pcDirectory = "directory";
/* FF_FindData_t can be large, so it is best to allocate the structure
dynamically, rather than declare it as a stack variable. */
pxFindStruct = ( FF_FindData_t * ) pvPortMalloc( sizeof( FF_FindData_t ) );
/* FF_FindData_t must be cleared to 0. */
memset( pxFindStruct, 0x00, sizeof( FF_FindData_t ) );
/* The first parameter to ff_findfist() is the directory being searched. Do
not add wildcards to the end of the directory name. */
if( ff_findfirst( pcDirectoryToScan, pxFindStruct ) == 0 )
{
do
{
/* Point pcAttrib to a string that describes the file. */
if( ( pxFindStruct->ucAttributes & FF_FAT_ATTR_DIR ) != 0 )
{
pcAttrib = pcDirectory;
}
else if( pxFindStruct->ucAttributes & FF_FAT_ATTR_READONLY )
{
pcAttrib = pcReadOnlyFile;
}
else
{
pcAttrib = pcWritableFile;
}
/* Print the files name, size, and attribute string. */
FreeRTOS_printf( ( "%s [%s] [size=%d]", pxFindStruct->pcFileName,
pcAttrib,
pxFindStruct->ulFileSize ) );
} while( ff_findnext( pxFindStruct ) == 0 );
}
/* Free the allocated FF_FindData_t structure. */
vPortFree( pxFindStruct );
}