今天遇到了Runtime Error 255的错误提示，在网上搜索了好一会儿都没找到比较详细的信息，竟然在Delphi的帮助文件中找到了，收集了一下运行时信息的资料，供日后参考。
Certain errors at runtime cause Delphi programs to display an error message and terminate.
Runtime errors take the form:
Runtime error nnn at xxxxxxxx
where nnn is the runtime error number, and xxxxxxxx is the runtime error address.
Applications that use the SysUtils class map most runtime errors to Exceptions, which allow your application to resolve the error without terminating.
Delphi runtime errors are divided into the following categories:
I/O errors, numbered 100 through 149
Fatal errors, numbered 200 through 255
Operating system errors
I/O error list
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.
The following table lists all fatal errors, numbers, and mapped exceptions.
Number Name Exception
200 Division by zero EDivByZero
201 Range check error ERangeError
202 Stack overflow EStackOverflow
203 Heap overflow error EOutOfMemory
204 Invalid pointer operation EInvalidPointer
205 Floating point overflow EOverflow
206 Floating point underflow EUnderflow
207 Invalid floating point operation EInvalidOp
210 Abstract Method Error EAbstractError
215 Arithmetic overflow (integer only) EIntOverflow
216 Access violation EAccessViolation
217 Control-C EControlC
218 Privileged instruction EPrivilege
219 Invalid typecast EInvalidCast
220 Invalid variant typecast EVariantError
221 Invalid variant operation EVariantError
222 No variant method call dispatcher EVariantError
223 Cannot create variant array EVariantError
224 Variant does not contain array EVariantError
225 Variant array bounds error EVariantError
226 TLS initialization error No exception to map to.
227 Assertion failed EAssertionFailed
228 Interface Cast Error EIntfCastError
229 Safecall error ESafecallException
230 Unhandled exception No exception to map to.
231 Too many nested exceptions Up to 16 permitted.
232 Fatal signal raised on a non-Delphi thread No exception to map to.
