| .ERDEV and ERDEV$ Function Details. |
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| ERDEV and ERDEV$ Function Details |
|
| Syntax |
| ERDEV |
| ERDEV$ |
| |
| ERDEV is an integer function that returns an error code from |
| the last device to declare an error. |
| |
| ERDEV$ is a string function that returns the name of the device generating |
| the error. ERDEV$ will contain the 8-byte character device name if the |
| error was on a character device, such as a printer. It will contain the |
| 2-byte block name (A:, B:, etc.) if the device was not a character device. |
| |
| Because ERDEV and ERDEV$ return meaningful information only after an |
| error, they are usually used in error handlers specified by an |
| ON ERROR statement. |
| |
| ERDEV and ERDEV$ cannot be used on the left side of an assignment. |
| |
| ERDEV is set by the critical error handler (interrupt 24H) when |
| DOS detects an error that prevents continuing. |
| |
| The value of ERDEV is a bit-encoded value containing the DOS |
| error information. The lower eight bits (first byte) contain the DOS |
| error code, a value from 0 to 12. The upper eight bits (second byte) |
| contain bits 15, 14, 13, XX, 3, 2, 1, and 0, in that order, of the |
| device-attribute word. XX indicates the bit is always zero. See the |
| Microsoft DOS Programmer's Reference for more information about |
| device-attribute words. |
