Re: Newbie Question- strtok type mismatch

Hi

It seems I've found the error.

        splitedString = strtok (NULL, " ");
Does not work with Root, I have to use

        splitedString = strtok (0, " ");
then it works.

Can anybody explain why this is the case? I thought NULL can be used throughout c and c++ ?

Cheers,
Hermann

On Mon, 2011-05-02 at 09:06 +0200, Hermann Fuchs wrote:
> Hello
>
> I am using the current stable version, version 5.28
>
> It causes a type missmatch, wheter I start it with .x myfile.cxx or .x
> myfile.cxx+
>
> I have attached my script below, perhaps it is something trivial, which
> I'm just not seeing.
> The reason why I'm using this complicated read process instead of using
> the built-in ReadFile is, because I've to preprocess the values first.
> The current source file consists of a single column of data which can be
> surrounded by leading and trailing spaces and blank lines.
> In the next step I want to read in a 8000*8000 matrix therefore the
> complicated design.
>
> any help would be greatly appreciated,
> Cheers,
> Hermann
> {
> gROOT->Reset();
> Int_t i,numValRead;
> //the variables for the data
> Double_t depth=0;
> Double_t EDep=0;
>
> Double_t x,y,z;
> Double_t incrementX,incrementY,incrementZ;
> Double_t startX,startY,startZ;
> Double_t value;
> Int_t nBytes=10000;
> Int_t len=0;
> Char_t line[nBytes];
> Char_t* splitedString;
>
> value=x=y=z=0;
> incrementX=incrementY=incrementZ=0.05;
> startX=startY=startZ=0;
> x=startX;
> y=startY;
> z=startZ;
>
> // open the ASCII file
> FILE *fp = fopen("sourceFileOneColumn.txt","r");
>
>
> // create a new ROOT file
> TFile *f = new TFile("testv1.root","RECREATE");
>
>
>
> // create a TTree
> TTree *tree = new TTree("EDep","OneDimZ-Edep");
>
> //create two branches with one variable each
> tree.Branch("depth",&depth,"depth/D");
> tree.Branch("EDep",&depth,"EDep/D");
>
>
> // fill the tree from the values in ASCII file
> while (fgets(line,(nBytes),fp))
> {
> // remove newline
> len = strlen(line);
> if( line[len-1] == '\n' ) line[len-1] = 0;
> //if stringlenght was zero, line is empty, skip it
> if (strlen(line) == 0) continue;
>
> //if starting with # skip line and go to next line
> if (line[0] == '#')
> {
> //printf( "# detected \n");
> continue;
> }
>
> //cut string by seperators
> printf("here\n");
>
> splitedString = strtok(line," ");
>
> while (splitedString != NULL)
> {
> //Fill tree
> EDep=atof (splitedString);
> depth=z;
> tree->Fill();
>
> splitedString = strtok (NULL, " ");
> //increment z
> z=z+incrementZ;
> }
>
> }
>
> // check what the tree looks like
> tree->Print();
>
> //close the source file
> fclose(fp);
>
> //write data to root file
> f->Write();
>
> //Close the root file
> f->Close();
> }
>
>
>
> On Fri, 2011-04-29 at 10:25 -0500, Philippe Canal wrote:
> > Hi Hermann,
> >
> > I can not reproduce the problem with the trunk. Which version of ROOT are you using?
> >
> > Cheers,
> > Philippe.
> >
> > On 4/29/11 9:05 AM, Hermann Fuchs wrote:
> > > Hello
> > >
> > > I apologize if this is a stupid question, as I am pretty new to Root
> > > development.
> > >
> > > I am trying to split a string using strtok. The same code fragment works
> > > outside of root, so i am unsure why this would cause an error.
> > >
> > > The troubling lines are:
> > >
> > > Char_t line[nBytes];
> > > Char_t* splitedString;
> > > ...
> > > fgets(line,(nBytes+1),fp)
> > > ...
> > >
> > > splitedString = strtok(line," ");
> > >
> > > The following error occurs:
> > >
> > > Error: strtok param[0] type mismatch readFilesv1.cxx:57:
> > > *** Interpreter error recovered ***
> > >
> > >
> > > Does anybody have an idea how to solve that problem?
> > > Any idea would help.
> > > Background info: I am trying to read an Asci file delimited by spaces.
> > >
> > >
> > > Cheers,
> > > Hermann
> > >
> >
> >
>
Received on Mon May 02 2011 - 10:34:02 CEST