Beginning with version 2.0, MS-DOS has included file-handle functions. All programs (except those that must be compatible with MS-DOS versions earlier than version 2.0) should use these functions for file management.
When a program opens or creates a file, MS-DOS assigns a unique handle to that file. The program can use the handle to access the file until the program closes the file. In some cases, a program can use a handle to read from and write to a device as if it were a file.
Following are the MS-DOS file-handle functions:
Function | Description | Version |
3Ch | Create File with Handle | 2.0 |
3Dh | Open File with Handle | 2.0 |
3Eh | Close File with Handle | 2.0 |
3Fh | Read File or Device | 2.0 |
40h | Write File or Device | 2.0 |
41h | Delete File | 2.0 |
42h | Move File Pointer | 2.0 |
4300h | Get File Attributes | 2.0 |
4301h | Set File Attributes | 2.0 |
45h | Duplicate File Handle | 2.0 |
46h | Force Duplicate File Handle | 2.0 |
56h | Rename File | 2.0 |
5700h | Get File Date and Time | 2.0 |
5701h | Set File Date and Time | 2.0 |
5Ah | Create Temporary File | 3.0 |
5Bh | Create New File | 3.0 |
67h | Set Maximum Handle Count | 3.3 |
68h | Commit File | 3.3 |
6Ch | Extended Open/Create | 4.0 |