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Compilation Error

 
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hhhuut
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PostPosted: Sat Mar 05, 2016 4:30 am    Post subject: Compilation Error Reply with quote

Hey guys,

I'm getting an error when trying to compile part of CEs source (using latest Lazarus release build, v1.6.1 I think).

Function that causes the error:
procedure IProcessAddress(address : WideString ; vartype : TVariableType ; showashexadecimal: Boolean=false;
showAsSigned: boolean=false; bytesize: Integer = 1; out res_address : WideString = '');stdcall;

Error Log:
    (3104) Compiling C:\Users\EH\Desktop\cheatengine-library-master\library\addresschangeunit.pas
    ..\library\addresschangeunit.pas(11,86) Error: (3337) Default values can only be specified for value, const and constref parameters
    ..\library\addresschangeunit.pas(13,1) Fatal: (10026) There were 1 errors compiling module, stopping
    Fatal: (1018) Compilation aborted
    Error: ..\Lazarus\fpc\3.0.0\bin\x86_64-win64\ppcx64.exe returned an error exitcode


The problem goes with the default parameter for the "res_address" variable, but I don't really know why it is a problem for the compiler.

Hope you guys can help me with that.

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Dark Byte
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PostPosted: Sat Mar 05, 2016 10:02 am    Post subject: Reply with quote

You can't use out after variables with a default value

And out can not have a default value

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hhhuut
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Joined: 08 Feb 2015
Posts: 606

PostPosted: Sat Mar 05, 2016 10:14 am    Post subject: Reply with quote

So how would I best fix this (best without turning the parameters)? With a "var" instead of "out"?

The whole unit (for better understanding):
Code:
unit AddressChangeUnit;

{$mode objfpc}{$H+}

interface

uses
  Classes, SysUtils, symbolhandler, byteinterpreter, CEFuncProc;

procedure IProcessAddress(address : WideString ; vartype : TVariableType ; showashexadecimal: Boolean=false;
  showAsSigned: boolean=false; bytesize: Integer = 1; out res_address : WideString = '');stdcall;

implementation

procedure IProcessAddress(address : WideString ; vartype : TVariableType ; showashexadecimal: Boolean=false;
  showAsSigned: boolean=false; bytesize: Integer = 1; out res_address : WideString = '');stdcall;
var a: PtrUInt;
  e: boolean;
begin
  //read the address and display the value it points to

  a:=symhandler.getAddressFromName(utf8toansi(address),false,e);
  if not e then
  begin
    //get the vartype and parse it
    res_address:=readAndParseAddress(a, vartype,nil,showashexadecimal, showAsSigned, bytesize);
  end
  else
    res_address:='???';
end;

end.

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