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$I: Input/Output-Checking Switch
Enables or disables the automatic code generation that checks the result of a call to an I/O procedure.
Syntax: {$I+} or {$I-}
Default: {$I+}
Type: Local
Menu Command: Options|Compiler|I/O Checking
Remarks
If an I/O procedure returns a non-zero I/O result when the $I switch is on, the program terminates, displaying a run-time error message.
When the $I switch is off, you must use the IOResult function to check for I/O errors.