curses problem

This is a discussion on curses problem within the Linux Programming forums, part of the Platform Specific Boards category; hi i have a strange problem in using curses.h. I called module 2 from module 1 using a switch statement, ...

  1. #1
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    Aug 2003
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    45

    curses problem

    hi

    i have a strange problem in using curses.h. I called module 2 from module 1 using a switch statement, and after the function in module 2 has got executed the control returns back to module 1. Till here there is no problem. But After that I called the module 1 main function again but it is not getting exectuted , instead the program hangs.I tried the same with module 1 and module 3 and it worked fine. I gave endwin() correctly after the control returned back to main. I also tried resetting the terminal before calling module 1 after the control returns. what could be the problem??

    raajesh

  2. #2
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    Post a snippet of code.

    (thread moved to the Linux forum)
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  3. #3
    Registered User
    Join Date
    Aug 2003
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    45

    code

    hi here is the code
    Code:
     
    switch(x)
                    {
    
                            // ENQUIRY SECTION
    
                            case 1:
                                    endwin();
                                    e();
                                    flag=1;
                                    break;
    
                            // ISSUE NEW POLICY SECTION
    
                            case 2:
                                    endwin();
                                    system("clear");
                                    add_policy();
                                    main();
                                    flag=1;
                                    break;
    
                            // CLAIM SECTION
    
                            case 3:
                                    
                                    system("clear");
                                    
                                    claim();
                                    
                                    
    
                                    main();
    }
    
    
    
    claim module
    
    -----------
    
    void settle_claim(int policy_num_i, int claim_amount_i, char *);
    
    claim()
    {
    
            //endwin();
            clear();
            char policy_num_s[10],claim_amount_s[10],claim_reason_s[60];
            int policy_num_i, claim_amount_i;
            int eof_flag = 0;
    
    
            initscr();
            start_color();
            init_pair(1,COLOR_MAGENTA,COLOR_BLACK);
    
            // Input and validate policy id, claim amount and claim reason
            //c/lear();
            //refresh();
    
    
            move(LINES/2-10,COLS/2-10);
            //attron(A_BOLD|A_UNDERLINE);
            printw("INSUREFAST: CLAIM MODULE");
     mvchgat(LINES/2-10,COLS/2-10,25,A_BOLD|A_UNDERLINE,1,NULL);
    
    
    
            //attroff(A_UNDERLINE);
            refresh();
            //refresh();
            //mvchgat(LINES/2-10,COLS/2-10,-1,A_BOLD,1,NULL);
            //refresh();
    
    
            move(LINES/2-8,COLS/2-8);
            policy_num_i = 0;
            while(policy_num_i == 0)
            {
                    printw("Enter Policy number: ");
                    mvchgat(LINES/2-8,COLS/2-8,-1,A_BOLD,1,NULL);
                    refresh();
                    move(LINES/2-8,COLS/2+13);
                    getnstr(policy_num_s,9);
                    policy_num_i = atoi(policy_num_s);
            }
    
    
            move(LINES/2-6,COLS/2-8);
            claim_amount_i = 0;
            while(claim_amount_i == 0)
            {
                    printw("Enter Claim Amount: ");
                    mvchgat(LINES/2-6,COLS/2-8,-1,A_BOLD,1,NULL);
                    refresh();
                    move(LINES/2-6,COLS/2+13);
                    getnstr(claim_amount_s,9);
     claim_amount_i = atoi(claim_amount_s);
            }
    
            move(LINES/2-4,COLS/2-8);
            printw("Enter Claim Reason: ");
            mvchgat(LINES/2-4,COLS/2-8,-1,A_BOLD,1,NULL);
            refresh();
            move(LINES/2-4,COLS/2+13);
            getnstr(claim_reason_s,29);
            attron(A_BOLD);
    
            // Settle the claim
    
            settle_claim(policy_num_i, claim_amount_i, claim_reason_s);
            //endwin();
            attroff(A_BOLD);
            return;
    }
    
    // What does the settle_claim function do?
    
    void settle_claim(int policy_num_i, int claim_amount_i, char claim_reason_s[])
    {
            FILE *policy_data_fp, *policy_detail_fp, *policy_cust_nom_fp, *claim_fp, *claim_temp_fp;
            FILE *scheme_years_fp;
            int policy_exist_flag = 0;      // To check if policy actually exists in file
            int eof_flag = 0;
            char cont_c;
    
            // Define structures; these structures *should* be created in structs.h
    
            policy_data_s claim_policy_data_s;
            policy_detail_s claim_policy_detail_s;
    policy_detail_s claim_policy_detail_tocheck_s;
            policy_data_s claim_policy_data_tocheck_s;
            policy_cust_nom_s claim_policy_cust_nom_s;
            claim_s claim_new_s;
            scheme_years_s claim_scheme_years_s;
    
            // Open file with policy data to check if policy number exists
    
            policy_data_fp = fopen("policy_data.dat","rb");
    
            if (policy_data_fp == NULL)
            {
                    printw("\nThe file policy_data.dat does not exist or cannot be accessed. Exiting...");
                    refresh();
                    printw("\nPress ENTER to continue...");
                    scanw("%c",&cont_c);
    
                    return;
            }
    
            // Checking if policy number is in file...
            // At the end, also check for EOF (through fgetc()) to avoid infinite loop
    
            do
            {
                    if (fread(&claim_policy_data_s,1,sizeof(policy_data_s),policy_data_fp) == 0)
                    {
                            eof_flag = 1;
                            printw("\nSorry, that policy number does not exist.");
                            refresh();
                            printw("\nHave a nice day.");
                            refresh();
    fcloseall();
                            printw("\n\nPress ENTER to continue...");
                            scanw("%c",&cont_c);
                    return;
                    }
            } while (claim_policy_data_s.pol_no_i != policy_num_i);
    
            // If we reach here, the record has been FOUND and is stored in the relevant structure
            // Now open policy_detail.dat file
    
            policy_detail_fp = fopen("policy_detail.dat","rb");
    
    
            if (policy_detail_fp == NULL)
            {
                    printw("\nSorry, your policy number exists, but the file policy_detail.dat does not exist or cannot be accessed. Exiting...");
                    refresh();
                    return;
            }
    
            scheme_years_fp = fopen("scheme_years.dat","rb");
    
            if (scheme_years_fp == NULL)
            {
                    printw("\nSorry, you policy number exists, but the file scheme_years.dat does not exist or cannot be accessed. Exiting...");
                    refresh();
                    return;
            }
    
            // The file is open. Now access details about the policy.
            // And compare each record's policy id and scheme id with record from policy_data fi
    
    do
            {
                    if (fread(&claim_policy_detail_s,sizeof(policy_detail_s),1,policy_detail_fp) == 0)
                    {
                    printw("\nSorry, your policy number exists, but the policy id and scheme id stored are invalid. Exiting...");
                    refresh();
                    fcloseall();
                    return;
                    }
            } while (claim_policy_detail_s.pol_id_i != claim_policy_data_s.pol_id_i);
            do
            {
                    if (fread(&claim_scheme_years_s,sizeof(scheme_years_s),1,scheme_years_fp) == 0)
                    {
                            printw("\nSorry, the scheme id cannot be found!");
                            refresh();
                            fcloseall();
                            return;
                    }
            } while (claim_scheme_years_s.scheme_id_i != claim_policy_data_s.scheme_id_i);
     if (claim_amount_i > claim_policy_detail_s.amt_covered_i)
            {
                    printw("\nSorry! The amount claimed is greater than the amount covered under your policy and scheme!");
                    refresh();
                    return;
            }
    
            // Everything seems to be alright and the claim is valid
            // Print the policy details
    
            printw("\n\nCongratulations, the claim is valid and has been accepted!");
            refresh();
            printw("\nThe details are as below:");
            refresh();
    
            printw("\n\nPolicy number: %d",policy_num_i);
            refresh();
            printw("\nPolicy id: %d",claim_policy_data_s.pol_id_i);
            refresh();
            printw("\nScheme id: %d",claim_policy_data_s.scheme_id_i);
            refresh();
            printw("\nClaim Amount: %d",claim_amount_i);
            refresh();
    
            printw("\n\nThank you.");
            refresh();
    fclose(policy_detail_fp);
    
            // We need to delete the customer record from the policy_data and policy_cust_nom files
            // To accomplish this, we use our temporary file
    
            policy_cust_nom_fp = fopen("policy_cust_nom.dat","rb");
    
            if (policy_cust_nom_fp == NULL)
            {
                    printw("\nThe policy_cust_nom does not exist or cannot be accessed. Exiting...");
                    refresh();
                    fcloseall();
                    return;
            }
    
            claim_temp_fp = fopen("claim_temp.dat","wb");
    
            if (claim_temp_fp == NULL)
            {
                    printw("\nThe claim temporary file claim_temp.dat cannot be opened for writing. Exiting...");
                    refresh();
                    fcloseall();
                    return;
            }
    
     eof_flag = 0;
    
            do
            {
                    if (fread(&claim_policy_cust_nom_s, sizeof(claim_policy_cust_nom_s),1,policy_cust_nom_fp) != 0)
                    {
                            if (claim_policy_cust_nom_s.pol_no_i != policy_num_i)
                            {
                                    fwrite(&claim_policy_cust_nom_s,sizeof(policy_cust_nom_s),1,claim_temp_fp);
                            }
                    }
                    else eof_flag = 1;
            } while (eof_flag == 0);
    
            // Close both files, remove the original and rename the temporary as the original
    
            fclose(claim_temp_fp);
            fclose(policy_cust_nom_fp);
    
            // NOTE: Platform dependent instructions ahead!
    
            system("rm -f policy_cust_nom.dat");
            system("mv claim_temp.dat policy_cust_nom.dat");
    
            // Now for updating the policy_data.dat file
            // The file is already open, but we will need to rewind
    
            rewind(policy_data_fp);
    
            // We use the _tocheck variable as a storage, since we will need the values ahead
    
            claim_policy_data_tocheck_s = claim_policy_data_s;
    
            claim_temp_fp = fopen("claim_temp.dat","wb");
    
    
            if (claim_temp_fp == NULL)
            {
                    printw("\nThe claim temporary file claim_temp.dat cannot be opened for writing. Exiting...");
                    refresh();
                    fcloseall();
                    return;
            }
    
            // Both files are open and ready for copying
    
            eof_flag = 0;
    
            do
    {
                    if (fread(&claim_policy_data_s, sizeof(claim_policy_data_s),1,policy_data_fp) != 0)
                    {
                            if (claim_policy_data_s.pol_no_i != policy_num_i)
                            {
                                    fwrite(&claim_policy_data_s,sizeof(policy_data_s),1,claim_temp_fp);
    
                            }
                    }
                    else eof_flag = 1;
            } while (eof_flag == 0);
    
            // Close both files, remove the original and rename the temporary as the original
    
            fclose(claim_temp_fp);
            fclose(policy_data_fp);
    
            // NOTE: Platform dependent instructions ahead!
    
            system("rm -f policy_data.dat");
            system("mv claim_temp.dat policy_data.dat");
     claim_fp = fopen("claim.dat","a");
    
            if (claim_fp == NULL)
            {
                    printw("\nThe claim report database cannot be opened! Exiting...");
                    refresh();
                    fcloseall();
                    return;
            }
    
            // Store the claim details in the claim_new_s structure for storage
    
            claim_new_s.pol_no_i = policy_num_i;
            claim_new_s.claim_amt_i = claim_amount_i;
            strcpy(claim_new_s.claim_reason_ca,claim_reason_s);
    
            // Store the structure; only one structure
    
            fwrite(&claim_new_s,sizeof(claim_s),1,claim_fp);
    
            // Close open files policy_data.dat and claim.dat
    
            fclose(claim_fp);
            fclose(policy_data_fp);
    
            //printw("hello");
            //refresh();
    
            // Bye bye and thanks for calling, hope we will meet again...
     refresh();
    
            return;
    }

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