Dear Rene
Thank you for this solution, now my code works.
(I knew that tmpname points to a different address,
but I did not know how to circumvent this problem)
Best regards
Christian
Rene Brun wrote:
> Hi Christian,
>
> What you do is illegal. When you delete tmpname, tmpname points
> to a different address than the one at creation time.
> Do something like
> TString outname = TString(name);
> char *keepname = new char[strlen(name) + 1];
> char *keepname = tmpname;
>
> Int_t idx = 0;
> tmpname = strtok(strcpy(tmpname,name),sep);
> while(tmpname) {
> outname = tmpname;
> if (idx == n) break;
> tmpname = strtok(NULL,sep);
> idx++;
> }//while
>
> delete [] keepname;
>
> Rene Brun
>
> On Sun, 15 Dec 2002, cstrato wrote:
>
>
>>Dear Rooters
>>
>>In order to extract variables from "const char *varlist",
>>with e.g. varlist = "x:y:z:a", I have created the following
>>function to get:
>> TString var1 = SubString("x:y:z:a", ":", 1);
>> TString var2 = SubString("x:y:z:a", ":", 2);
>>
>>//-------------------------
>>TString SubString(const char *name, const char *sep, Int_t n)
>>{
>> // Extract substring from name at separator number n
>>
>> TString outname = TString(name);
>> char *tmpname = new char[strlen(name) + 1];
>>
>> Int_t idx = 0;
>> tmpname = strtok(strcpy(tmpname,name),sep);
>> while(tmpname) {
>> outname = tmpname;
>> if (idx == n) break;
>> tmpname = strtok(NULL,sep);
>> idx++;
>> }//while
>>
>> delete [] tmpname; //<======== Problem
>>
>> return outname;
>>}//SubString
>>//------------------------
>>
>>However, often, I get the following error:
>>*** malloc[416]: Deallocation of a pointer not malloced: 0x1b2d565;
>>This could be a double free(), or free() called with the middle of
>>an allocated block; Try setting environment variable MallocHelp to
>>see tools to help debug
>>
>>Can you tell me if I have to delete tmpname or not?
>>Does the TString class offer me a better way?
>>
>>Thank you in advance for your help.
>>
>>Best regards
>>Christian
>>_._._._._._._._._._._._._._._._
>>C.h.i.s.t.i.a.n S.t.r.a.t.o.w.a
>>V.i.e.n.n.a A.u.s.t.r.i.a
>>_._._._._._._._._._._._._._._._
>>
>>
>>
>
>
>
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