That that does the trick - Thanks
Philippe Canal wrote:
> Hi,
>
> The 2nd parameter to ShowMembers __must__ be modifiable.
> So use something like:
>
> char cbuf[1000]; *cbuf=0;
> Insp insp;
> obj->ShowMembers(insp,cbuf);
>
> Cheers,
> Philippe.
>
>
> Christopher Backhouse wrote:
>> Hi,
>>
>> I want to compare two objects (of the same class, inheriting from
>> TObject) field by field.
>> I thought I could use TMemeberInspector to accomplish this, but my
>> test program crashes:
>>
>> #include "TMemberInspector.h"
>> #include "TH1F.h"
>>
>> #include <iostream>
>> using namespace std;
>>
>> class Insp: public TMemberInspector
>> {
>> public:
>> virtual void Inspect(TClass *cl, const char *parent, const char
>> *name, const void *addr)
>> {
>> cout << cl << " " << parent << name << " " << addr << endl;
>> }
>> };
>>
>> void show_members()
>> {
>> TObject* obj = new TH1F("bar", "baz", 100, 0, 100);
>> Insp insp;
>> obj->ShowMembers(insp, "TH1F.");
>> }
>>
>>
>> > loon show_members.C+
>> loon [0]
>> Processing show_members.C+...
>> Info in <TUnixSystem::ACLiC>: creating shared library
>> /data/minos/bckhouse/tests/./show_members_C.so
>> 0xa077468 TH1F.fNcells 0x9ffb0f4
>> 0xa077468 TH1F.fXaxis 0x9ffb0f8
>> Segmentation fault
>>
>>
>> Running under gdb, I see the segfault is in strcat()
>>
>> If I substitute a class from our framework instead of TH1F then I can
>> see the line that crashes:
>>
>>
>> #1 0x03ea67a2 in ANtpHeaderInfo::ShowMembers (this=0x92ce0f0,
>> R__insp=@0xbff45e10, R__parent=0x503300 "TH1F.")
>> at
>> /data/minos/minos/software/OO/minossoft/releases/dev_2/tmp/Linux2.6-GCC_3_4/AnalysisNtuples/libAnalysisNtuples-shared/AnalysisNtuplesCint.cc:1362
>>
>> 1362 softVersion.ShowMembers(R__insp,
>> strcat(R__parent,"softVersion.")); R__parent[R__ncp] = 0;
>> Current language: auto; currently c++
>> (gdb) list
>> 1357 R__insp.Inspect(R__cl, R__parent, "isGoodFDData",
>> &isGoodFDData);
>> 1358 R__insp.Inspect(R__cl, R__parent, "snarlPE", &snarlPE);
>> 1359 R__insp.Inspect(R__cl, R__parent, "sntpRow", &sntpRow);
>> 1360 R__insp.Inspect(R__cl, R__parent, "isLI", &isLI);
>> 1361 R__insp.Inspect(R__cl, R__parent, "softVersion",
>> &softVersion);
>> 1362 softVersion.ShowMembers(R__insp,
>> strcat(R__parent,"softVersion.")); R__parent[R__ncp] = 0;
>> 1363 TObject::ShowMembers(R__insp, R__parent);
>> 1364 }
>> 1365
>>
>>
>> I am using root trunk.
>> Any ideas? Am I using TMemberInspector right?
>>
>> Thanks - Chris
>>
Received on Sat Dec 06 2008 - 13:25:35 CET