API:System.SysUtils.EPathNotFoundException
Delphi
EPathNotFoundException = class(EInOutError);
C++
class PASCALIMPLEMENTATION EPathNotFoundException : public EInOutError
Properties
Type | Visibility | Source | Unit | Parent |
---|---|---|---|---|
class | public | System.SysUtils.pas System.SysUtils.hpp |
System.SysUtils | System.SysUtils |
Description
EInOutError is the exception class for file input/output errors.
System.SysUtils.EPathNotFoundException inherits from System.SysUtils.EInOutError. All content below this line refers to System.SysUtils.EInOutError.
EInOutError is the exception class for file input/output errors.
EInOutError is raised when a file input/output error occurs, provided I/O checking is enabled.
Note: In Delphi code, use the
$I+
directive to enable I/O checking. If an I/O error occurs while this directive is disabled, the application must call IOResult to clear the error.
Note: In C++ programs, I/O checking is a project option.
The error code is available in the ErrorCode class member. Error codes come in ranges from 0 through 99 (native OS errors). An error number greater than 100 indicates a Delphi OS error.
Error codes in the range from 0 through 99 represent OS error conditions. Refer to the OS documentation for complete error summaries. The SysErrorMessage function returns descriptive text for OS errors.
Here are some common OS I/O errors.
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. |
Tip: When developing GUI applications and you need to provide console I/O, then you need to use the AllocConsole method in order to avoid a 105 File not open for output
error. After you end your console I/O code block, call FreeConsole.
begin
AllocConsole;
Writeln('Console I/O is now enabled.');
{ code block }
FreeConsole;
end;
{
AllocConsole();
printf("Console I/O is now enabled.\n");
/* code block */
FreeConsole();
}
See Also
- System.IOResult
- System.Classes.EStreamError
- System.SysUtils.SysErrorMessage
- Input-Output Errors
- File Input and Output Support
- Disk And Directory Support Routines
- Standard Routines and Input-Output