Mulltimap multiple file output

[crochunter]

Hi.
I am trying to create multiple output files while reading a single input file. The multiple files will be created based on the value in the first field.

My set1 contains 1,2,3,2,1,3. That is Field1 values.
My multimap contains the other fields (field2 and field3).
Now what I am trying to do is to use ofstream to output multiple output files dynamically. Its just creating 1 file and duplicating records :(

Here is my input file:-

1    AAAAAA    BBBBBB    
2    DDDDDD    EEEEEE
3    GGGGGG    HHHHHH
2    NNNNNN    LLLLLL
1    UUUUUU    KKKKKK  
3    SSSSSS  BBBBBB

This is how I expect my output to be:-

file1.txt:
1    AAAAAA    BBBBBB
1    UUUUUU    KKKKKK
 
file2.txt:
2    NNNNNN    LLLLLL
2    DDDDDD    EEEEEE
 
file3.txt:
3    GGGGGG    HHHHHH
3    SSSSSS  BBBBBB

Here is my code so far:-

          set1.insert(field1);
     for(itv=set1.begin(); itv !=set1.end(); itv++)
 
     {
       if(chr.compare(*itv)==0){
          string filenamei = "myfile";
          multimap<string,string> mmi;
          ofstream out;
          mmi.insert (pair<string,string>(band,start));
          out.open(filenamei.c_str());
       for (it= mmi.begin(); it != mmi.end(); it++){
 
              cout << (*it).first << "\t" << (*it).second << endl;
       }
 
       }//end of if loop
     }

Thanks

[mac11]

Your code is only opening one output file.

If you want to write to multiple files you need to have multiple output streams (one for each file), and then write the data to each one.

I suppose you can do it with one output stream just open file1, write data, close stream, open file2, write data, close, etc...

[crochunter]

Ya thats true but as per my problem there could be any number of output files that could be generated based on my first field values. So I was thinking a way by what I can do it dynamically ?
Like using a for loop and creating output files

Like file[i].txt

Thanks

[Banfa]

Your code already contains a for loop editing the file, all you have to do is use a different file name each time round the loop.