83Plus:Software:usb8x/Asm Interface/MSD/DOS createFile

Synopsis

Name: DOS_createFile

Minimum usb8x version: 0.10

Creates a new file in specified directory of size 0.

Inputs

• BC points to the starting cluster of the directory to create file in (obtained with [[../FAT_getStartingCluster|FAT_getStartingCluster]])
• HL points to an ASCIIZ string of the filename (ex. "test.txt")

Outputs

• File is created with size 0
• C set if problems

Destroys

• AF, BC, DE, HL
• OP registers

Notes

The file created date/time attributes are set according to the 84+/SE clock. Example code to create "readme.txt" in "test" directory:

ld hl,sDirectory
U_CALL FAT_getStartingCluster
push hl
pop bc ;BC contains starting cluster
ld hl,sFilename
U_CALL DOS_createFile
...
sFilename: DB "readme.txt",0
sDirectory: DB "/test",0

To read/write to this file, you must then open the file with [[../DOS_openFile|DOS_openFile]].

See Also

• [[../FAT_getStartingCluster|FAT_getStartingCluster]] - Get starting cluster of specified directory
• [[../DOS_openFile|DOS_openFile]] - Open file for reading and writing