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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for June, 2018

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Horace Dediu on Twitter: “Personal computing, the first 40 years.… “

Posted by jpluimers on 2018/06/01

[WayBack] Horace Dediu on Twitter: “Personal computing, the first 40 years.… “

–jeroen

Read the rest of this entry »

Posted in History, Power User | Leave a Comment »

“Unknown function at TMethodImplementationIntercept”

Posted by jpluimers on 2018/06/01

Reminder to self: when you get Unknown function at TMethodImplementationIntercept in a Delphi stack trace from the Exception.StackTrace property or FastMM memory report:

  1. Ensure you generate a .MAP or .TDS file with full debug information
  2. Copy the .MAP or .TDS files to directory of your EXE.

Via:

The Exception.StackTrace was introduced in Delphi 2009 that extended these [WayBack] Exception Members:

Some notes:

  • Fields where you can put hooks in; if there is no hook in place, they won’t be used:
    • [WayBack] Exception.GetExceptionStackInfoProc Field GetExceptionStackInfoProc: function (P: PExceptionRecord): Pointer;
      • This function is called to return an opaque data structure that contains stack information for the given exception information record. This function will be called when the exception is about to be raised or if this is an external exception such as an Access Violation, called soon after the object is created.
    • [WayBack] Exception.CleanUpStackInfoProc Field CleanUpStackInfoProc: procedure (Info: Pointer);
      • This function is called when the destructor is called to clean up any data associated with the given opaque data structure.
    • [WayBack] Exception.GetStackInfoStringProc Field GetStackInfoStringProc: function (Info: Pointer): string;
      • This function is called to return a string representation of the opaque data structure returned by GetExceptionStackInfoProc

TMethodImplementationIntercept was introduced in the System.Rtti unit of Delphi XE6 [WayBack]:

–jeroen

Example code:


unit ExceptionHelperUnit;
interface
uses
System.SysUtils;
type
ExceptionHelper = class helper for Exception
public
function Describe: string;
class procedure RaiseNotImplementedException(const aClass: TClass; const aMethodName: string);
class function GetStackTrace: string;
end;
implementation
uses
System.RTLConsts,
System.SysConst;
type
EStackTraceException = class(Exception); // EProgrammerNotFound to make it really clear this is only to be used in very limited places ??
{ ExceptionHelper }
function ExceptionHelper.Describe: string;
var
lStackTrace: string;
begin
Result := inherited ToString();
if Self is EInOutError then
if Result = System.RTLConsts.SInvalidFileName then
Result := System.SysConst.SInvalidFileName;
if Assigned(StackInfo) then
lStackTrace := StackTrace
else
lStackTrace := 'empty';
Result := Format('Exception'#13#10'%s at $%p: %s'#13#10'with StackTrace'#13#10'%s', [ClassName, ExceptAddr, Result, lStackTrace]);
end;
class function ExceptionHelper.GetStackTrace: string;
begin
try
Result := 'Get StackTrace via Exception.';
raise EStackTraceException.Create(Result) at ReturnAddress;
except
on E: EStackTraceException do
Result := E.StackTrace;
end;
end;
class procedure ExceptionHelper.RaiseNotImplementedException(const aClass: TClass; const aMethodName: string);
begin
raise ENotImplemented.CreateFmt('Method %s.%s is not implemented.', [aClass.ClassName, aMethodName]);
end;
end.

view raw

ExceptionHelperUnit.pas

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Posted in Delphi, Development, FastMM, Software Development | Leave a Comment »

Regex – Does not contain certain Characters – Stack Overflow

Posted by jpluimers on 2018/06/01

I had to find strings containing ” of object”, but not starting with a “)”, so the regex became this:

[^)] of object

Source: [WayBack] Regex – Does not contain certain Characters – Stack Overflow

–jeroen

Posted in Development, RegEx, Software Development | Leave a Comment »

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