System.IOResult
Delphi
function IOResult: Integer;
C++
extern DELPHI_PACKAGE int __fastcall IOResult(void);
Properties
Type | Visibility | Source | Unit | Parent |
---|---|---|---|---|
function | public | System.pas System.hpp |
System | System |
Description
Returns the status of the last I/O operation performed.
IOResult returns the result of the last Delphi I/O routine when I/O-checking is off (that is, when using the {$I-} compiler option). If IOResult returns 0, the last I/O operation succeeded. Otherwise, IOResult returns an error code.
If an I/O error occurs and I/O-checking is off, all subsequent I/O operations are ignored until the internal error flag is cleared. Calling IOResult clears the internal error flag.
An alternative way to handle I/O errors is to use exception handling with the {$I+} compiler option.
The following table lists all I/O errors, numbers, and descriptions.
Number |
Name |
Description |
100 |
Disk read error |
Reported by Read on a typed file if you attempt to read past the end of the file. |
101 |
Disk write error |
Reported by CloseFile, Write, WriteIn, or Flush if the disk becomes full. |
102 |
File not assigned |
Reported by Reset, Rewrite, Append, Rename, or Erase if the file variable has not been assigned a name through a call to Assign or AssignFile. |
103 |
File not open |
Reported by CloseFile, Read Write, Seek, Eof, FilePos, FileSize, Flush, BlockRead, or BlockWrite if the file is not open. |
104 |
File not open for input |
Reported by Read, Readln, Eof, Eoln, SeekEof, or SeekEoln on a text file if the file is not open for input. |
105 |
File not open for output |
Reported by Write or Writeln on a text file if you do not generate a Console application. |
106 |
Invalid numeric format |
Reported by Read or Readln if a numeric value read from a text file does not conform to the proper numeric format. |
See Also