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How to write data in notepad using Loadrunner script

This code will save the Vendor numbers to a notepad file.
(put it in vuserinit starting after Header)
//Path for saving the notepad file, the file name is "MatDocument.txt"
#define filename "C:\\Documents and Settings\\ravi\\Desktop\\MatDocument.txt"
f_Write(char *str1)
{
         long a;
         a = fopen(filename,"a+");
         if (a==NULL)
          {
            return -1;
         }
         else
         {
            fprintf(a,"Material Document Number is %s\n",str1);
            fclose(a);
         }
}

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