| .FIELD Statement Details. |
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| FIELD Statement Details |
|
| Syntax |
| FIELD [#]filenumber, fieldwidth AS stringvariable |
| [,fieldwidth AS stringvariable] ... |
| |
| Argument Description |
| filenumber The number used in the file's OPEN statement |
| |
| fieldwidth The width of the field in the record |
| |
| stringvariable The string variable that contains the date read |
| from a record or data that is used in an |
| assignment when information is written to a record |
| |
| |
| The total number of bytes that you allocate in a FIELD statement |
| must not exceed the record length that you had specified when opening |
| the file. Otherwise, an error message is generated that reads "FIELD |
| overflow." (The default record length is 128 bytes.) |
| |
| Any number of FIELD statements may be executed for the same file. All |
| FIELD statements that have been executed remain in effect at the same |
| time. |
| |
| All field definitions for a file are removed when the file is closed; |
| that is, all strings defined as fields associated with the file are |
| set to null. |
| |
| Do not use a variable name defined as a field in an INPUT or |
| assignment statement if you wish the variable to remain a field. Once |
| a variable name is a field, it points to the correct place in the |
| random-access file buffer. If a subsequent INPUT or assignment |
| statement with that variable name is executed, the variable's pointer |
| no longer refers to the random-access record buffer, but to string |
| space. |
| |
| Note: BASIC's record variables and extended OPEN statement syntax |
| provide a more convenient way to use random-access files. |
| |
| Differences from BASICA |
| |
| When a random-access file is closed with a CLOSE or RESET statement in |
| a compiled program, all variables that are fields associated with that |
| file are reset to null strings. When a random-access file is closed in |
| a BASICA program, variables that are fields retain the last value |
| assigned to them by a GET statement. |
