Convert int to string for use as FILENAME

Code:

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void scanimg(IplImage *scnimg){
        for(int k=0; k<SCL_NUM; k++){
                ofstream localfile;
                char s1[20];
                std::stringstream ss1;
                ss1<<k<<".csv";
                s1=ss1.str();
                localfile.open(s1);       
                for(int i=SCANRAD; i<H-SCANRAD; i+=5){
                        for(int j=SCANRAD; j<W-SCANRAD; j+=5){                               
                                scnmakevec(scnimg,i,j);
                                localfile<<crocor(scenevec,scalevecs[k])<<",";
                        }
                        localfile<<endl;
                }       
                localfile.close();
        }
}

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I want the files to be named as "1.csv", "2.csv" and so on. The error I get is:

Code:

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cannot convert from 'std::basic_string<_Elem,_Traits,_Ax>' to 'char [20]'

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Does anyone know a way around?

Code:

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s1 = ss1.str();

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Arrays are not assignable.

Why introduce arrays, when you have the string already in the stream?

Code:

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std::stringstream ss1;
ss1<<k<<".csv";
localfile.open(ss1.str().c_str());

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Regards,

Paul McKenzie

Awesome!