CBL_OPEN_FILE
Opens an existing file for byte-stream operations.
Syntax:
call "CBL_OPEN_FILE" using filename
access-mode
deny-mode
device
file-handle
Parameters:
|
Using call prototype (see Library Routines - Key) |
Picture (32-bit systems) |
filename |
pic x(n). |
pic x(n). |
access-mode |
cblt-x1-compx. |
pic x comp-x. |
deny-mode |
cblt-x1-compx. |
pic x comp-x. |
device |
cblt-x1-compx. |
pic x comp-x. |
file-handle |
cblt-bytestream-handle. |
pic x(4) comp-5. |
On Entry:
filename |
Space- or null-terminated filename of the file to be opened. You can use
spacey filenames if you put double quotation marks around them. You can use
embedded environment variables and library names in filename; for more information
see the chapter Filenames in your File Handling book. |
access-mode |
Defines access mode:
1 |
Read only |
2 |
Write only (deny-mode must be 0) |
3 |
Read/write |
64 |
Read/write files greater than 4Gb | |
deny-mode |
Defines deny mode:
0 |
Deny both read and write (exclusive) |
1 |
Deny write |
2 |
Deny read |
3 |
Deny neither read nor write | |
device |
Reserved for future use (must be 0). |
On Exit:
file-handle |
Returns a file handle for a successful open. |
Comments:
The success of the call can be checked by examining RETURN-CODE.
See Also: