Output of different files are mixing......Help needed

This is a discussion on Output of different files are mixing......Help needed within the C Programming forums, part of the General Programming Boards category; I am using a function in my program (windows compiler), which is here Code: void madrun_for_twiss(major_ip *ptr_major_ip, int *module_line_no, FILE ...

  1. #1
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    Output of different files are mixing......Help needed

    I am using a function in my program (windows compiler), which is here
    Code:
     
    void madrun_for_twiss(major_ip *ptr_major_ip, int *module_line_no, FILE *mad_call_file, int *err_index, FILE *fp_log)
    {
         *err_index=0;
         
         int call_status;
         
         fprintf(fp_log,"\n Header: mad_run; Fun: madrun_for_twiss -> TITLE   is passed to madrun_for_twiss: %s",ptr_major_ip->title_line_name);
         fprintf(fp_log,"\n Header: mad_run; Fun: madrun_for_twiss -> ASSIGN  is passed to madrun_for_twiss: %s",ptr_major_ip->mad_assign_file);
         fprintf(fp_log,"\n Header: mad_run; Fun: madrun_for_twiss -> LATTICE is passed to madrun_for_twiss: %s",ptr_major_ip->mad_lattice_file);
         
         //FILE *mad_call_file=fopen("major_input.dat","w");
         
         fprintf(mad_call_file,"\n TITLE,\"%s\"",ptr_major_ip->title_line_name);
         
         fprintf(mad_call_file,"\n ASSIGN,PRINT=\"%s\"",ptr_major_ip->mad_assign_file);
         fprintf(mad_call_file,"\n\n CALL, FILENAME=%s",ptr_major_ip->mad_lattice_file);                   
         if(*(module_line_no+6) >= 0)fprintf(mad_call_file,"\n\n USE,%s,RANGE=#S/E",ptr_major_ip->use_line_name);
         fprintf(mad_call_file,"\n PRINT,RANGE=#S/E");
         
         /* Always use couple option */   
         fprintf(mad_call_file,"\n TWISS,DELTAP=0.000,COUPLE,SAVE=LATTICE");                  
         fprintf(mad_call_file,"\n\n STOP");                                 
         fclose(mad_call_file);
         
         fprintf(fp_log,"\n Header: mad_run; Fun: madrun_for_twiss -> MAD batch file called");
         call_status=system("MAD8.BAT major_input.dat>mad_out_warning.txt");
         
         return;
    }
    Here the statements in fprintf(mad_call_file,".....) also appears in file pointed by fp_log and file pointed by mad_call_file does not have any text written in it and program halts at statement fclose(mad_call_file). It appears that I can not close the file (which is opened in another function and is calling this function) in this function. But it is needed here, because I am running a batch file in next line using this file as an argument. Firstly I though that I could open the file pointed by mad_call_file in function itself, rather than passing FILE * from outside. But I do not know why program window disappears as program reaches to statement of mad_call_file=fopen("major_input.dat","w"); and this also did not work (this is presently commented). I could not understand why this is happening. Is the address pointed by two file pointers can create such problems? How I can solve this problem?

    Thanks and regards...

  2. #2
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    Well, without seeing how you call this function we really can't say. Perhaps you're doing something silly like passing fp_log in both places. If your program is just disappearing, I would guess that you have a seg fault or some such. We need more code to be sure.

  3. #3
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    Thanks anduril,

    I was checking code again.... In function, which is calling the function "madrun_for_twiss", there is another section, in which memory allocation was wrong i.e. I was allocating less memory than required......I found this hint from you reply about seg fault, so that I checked for mainly memory allocation....


    Regards...

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