On Thu, 13 Nov 2003, Masaharu Goto wrote:
> Hello Rene,
>
> About length limit of the params argument, itself doesn't have
> direct limit, but each argument separated by ',' has to be less
> than G__ONELINE.
>
> "12345134,aaaaabbbbbbbbbbcccccccccccccc,3.151245"
> <--a0---> <------------a1------------------> <---a2->
>
> In above example, each of a0-a2 has to be shorter than G__ONELINE
> which is defined as 4096 most of the cases.
>
Hi Rene and Masa,
that is not what I observe.
I have the following macro which fails if the string is longer than 255
characters:
{
TNamed* name = new TNamed("name", "title");
cout << name->GetName() << endl;
TDataMember* thevar = name->IsA()->GetDataMember("fName");
TMethodCall* setter = thevar->SetterMethod(name->IsA());
TString param("\" newname newname newname newname newname newname newname
newname newname newname newname newname newname newname newname newname
newname newname newname newname newname newname newname newname newname
newname newname newname newname newname newname newn\"");
cout << param.Length() << endl;
setter->Execute(name, param.Data());
cout << name->GetName() << endl;
param += "a";
cout << param.Length() << endl;
setter->Execute(name, param.Data());
cout << name->GetName() << endl;
}
on 3.04_02, linux, pentium III it produces
[avalon] ~/h1/oo/devel $ root -l
root [0] .x macro.C
name
255
newname newname newname newname newname newname newname newname newname
newname newname newname newname newname newname newname newname newname
newname newname newname newname newname newname newname newname newname
newname newname newname newname newn
256
Error: String literal syntax error FILE:macro.C LINE:14
*** Interpreter error recovered ***
*** Break *** segmentation violation
Generating stack trace...
0x401c756d in StackTrace__11TUnixSystem + 0x2e1 from
/products/ROOT/3.04_02/ROOT-linux24-gcc-2.95.3/lib/libCore.so
0x401c5eff in DispatchSignals__11TUnixSystem8ESignals + 0xc7 from
/products/ROOT/3.04_02/ROOT-linux24-gcc-2.95.3/lib/libCore.so
0x401c51a0 in GetSize__C8TWebFile + 0xc4 from
/products/ROOT/3.04_02/ROOT-linux24-gcc-2.95.3/lib/libCore.so
0x401c8e43 in GetSockOpt__11TUnixSystemiiPi + 0x30f from
/products/ROOT/3.04_02/ROOT-linux24-gcc-2.95.3/lib/libCore.so
0x40dfae58 in killpg + 0x58 from /lib/libc.so.6
0x4044eba0 in _IO_2_1_stderr_ at
/data/gcc-2.95.3/hierhinein/gcc/include/new:39 from
/products/ROOT/3.04_02/ROOT-linux24-gcc-2.95.3/lib/libCore.soR
and on 3.05_07:
[avalon] ~/h1/oo/devel $ root -l
root [0] .x macro.C
name
255
newname newname newname newname newname newname newname newname newname
newname newname newname newname newname newname newname newname newname
newname newname newname newname newname newname newname newname newname
newname newname newname newname newn
256
Error: String literal syntax error FILE:macro.C LINE:14
*** Interpreter error recovered ***
newname newname newname newname newname newname newname newname newname
newname newname newname newname newname newname newname newname newname
newname newname newname newname newname newname newname newname newname
newname newname newname newname newn
root [1]
Cheers
Gero
> > Hi Masa,
> >
> > Could you answer this question from Gero (was in roottalk)?
> >
> > TMethodCall::Execute calls G__CallFunc::SetVars(params)
> >
> > What is the maximum length of the params string?
> > I have the impression that this is defined by G__MAXFUNCPARA
> > that is set to 40 by default. This is certainly too short in case
> > of templated arguments.
> >
> > Rene
> >
> >
> > Gero Flucke wrote:
> > >
> > > Hi!
> > > I wonder whether (and why if I am right) in
> > >
> > > TMethodCall::Execute(void* object, const char* params)
> > >
> > > there is a limitation of the length of the string 'params'?
> > >
> > > For me it seems that it must not be longer than 255 characters,
> otherwise
> > > it crashes - most of the times...
> > >
> > > (ROOT 3.04_02 and 3.05_07 on linux, pentium III)
> > >
> > > Cheers
> > >
> > > Gero Flucke
-----------------------------------------------------------------------
Gero Flucke
1a / 603
DESY
Notkestr. 85
22607 Hamburg
+49-(0)40-8998-2454
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