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Passing array of structures into a function

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Passing array of structures into a function

 
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  #1
Oct 24th, 2005
I direly need help with passing an array of structures into a function.
The problem is that Main_menu.name is blank. What is the correct syntax to pass by reference, so that I will get the Main_menu.name in main()? I would like to use pointer in the createMenu function for efficiency. createMenu function reads data from a resource file and assigns the value to the field.
Would someone please help? Thanks.

C++ Syntax (Toggle Plain Text) 
  1. Struct menu 
  2. {
  3.   int Id;
  4.   char name[10];
  5. };
  6.  
  7. menu Main_menu[10];
  8.  
  9. void createMenu (menu*  menuPtr);
  10. { 
  11.   While (!numData.getline(inputId,10, '$').eof())
  12.     {
  13.         menuPtr->Id = inputId;
  14.         getline( inputName, 10,  '\n');
  15.         strcat(menuPtr->name, inputName);
  16.         menuPtr++;
  17.      }
  18.  
  19. }
  20.  
  21. int Main () 
  22. {
  23. createMenu(Main_menu);
  24. For (int i= 0; I < 10; i++)
  25. {    Cout << Main_menu.id << Main_menu.name << endl;} 
  26.  return 0;
  27. }
<< moderator edit: added code tags: [code][/code] >>
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Re: Passing array of structures into a function

 
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  #2
Oct 24th, 2005
First, consider a real code editor instead of something like MS Word that capitalizes unwantedly and automatically. C and C++ are case sensitive. And I'm sure there must be plenty of good, and free, code editors available.

Second, it's a bad idea to use eof() to control a loop. Check for success rather than one possible failure.

Third, using strcat to do a strcpy may not be the safest choice.

Now, do you have an actual copy-and-paste of your actual code, and perhaps a sample input, so that it would be easier for me (and others) to try to help you?
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Re: Passing array of structures into a function

 
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  #3
Oct 25th, 2005
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Originally Posted by Dave Sinkula
First, consider a real code editor instead of something like MS Word that capitalizes unwantedly and automatically. C and C++ are case sensitive. And I'm sure there must be plenty of good, and free, code editors available.

Second, it's a bad idea to use eof() to control a loop. Check for success rather than one possible failure.

Third, using strcat to do a strcpy may not be the safest choice.

Now, do you have an actual copy-and-paste of your actual code, and perhaps a sample input, so that it would be easier for me (and others) to try to help you?
--------------------------------------------------------------------
Here are the codes, with data input at end. Thanks again.

C++ Syntax (Toggle Plain Text) 
  1. #include <iostream>
  2. #include <fstream.h>
  3. #include <string.h>
  4.  
  5. using namespace std;
  6.  
  7. ofstream outData;
  8.  
  9.  
  10. //input file structure
  11. ifstream inData;
  12. char  menu_id[10];
  13. char  menu_name[10];
  14. char  menu_col[10];
  15. char  menu_row[10];
  16. char  button_id[10];
  17. char  button_label_1[10];
  18. char  button_label_2[10];
  19. char  button_label_3[10];
  20. char  button_col[10];
  21. char  button_row[10];
  22.  
  23. //menu file structure
  24. struct menu
  25. {
  26.    int  mid; 
  27.    char name[20]; 
  28.    int  mcol;
  29.    int  mrow;
  30.    int  bid;
  31.    char blabel[24];
  32.    int  bcol;
  33.    int  brow;
  34. }; 
  35.  
  36. //List of menus
  37. enum menu_id 
  38. {
  39.   MAIN = 1
  40. };
  41.  
  42.  
  43. //Define Main menu
  44. menu  Main_menu[3];   
  45.  
  46.  
  47.  
  48. void createMenu(menu newMenu[], int menu_num, MAS_Configure_Button_Request_Message* msg )
  49. {
  50.          int y = 0;
  51.  
  52. 	while ((!inData.getline(menu_id,10, '$').eof()) && (atoi(menu_id) == menu_num))
  53.         {
  54.  
  55.           newMenu[y].mid= atoi(menu_id); 
  56.  
  57.           inData.getline(menu_name, 10, '$');
  58.           newMenu[y].name[0] = '\0'; 
  59.           strcpy(newMenu[y].name,menu_name); 
  60.           outData << " Main Menu Name " << newMenu[y].name << "    " ; 
  61.  
  62.           inData.getline( menu_col, 10,  '$');
  63.           newMenu[y].mcol = atoi(menu_col);
  64.  
  65.           inData.getline( menu_row, 10,  '$');
  66.           newMenu[y].mrow = atoi(menu_row);
  67.  
  68.           inData.getline( button_id, 10,  '$');
  69.           newMenu[y].bid = atoi(button_id);
  70.  
  71.           inData.getline( button_label_1, 10, '$');
  72.           inData.getline( button_label_2, 10, '$');
  73.           inData.getline( button_label_3, 10, '$');
  74.           newMenu[y].blabel[0] = '\0'; 
  75.           strcpy(newMenu[y].blabel,button_label_1); 
  76.           strcat(newMenu[y].blabel,button_label_2); 
  77.           strcat(newMenu[y].blabel,button_label_3); 
  78.           outData <<  newMenu[y].blabel << ";   " ;
  79.  
  80.           inData.getline( button_col ,10, '$');
  81.           newMenu[y].bcol    = atoi(button_col);
  82.  
  83.  
  84.           inData.getline( button_row ,10, '\n');
  85.           newMenu[y].brow    = atoi(button_row);
  86.           y++;
  87.  
  88.  
  89.        }
  90. }
  91.  
  92.  
  93. int main()
  94. {
  95.        int loop;
  96.        inData.open("data.txt");
  97.        if (!inData)
  98.        { 
  99.   		cout << "*** Problem with opening data.txt. End program***" << endl;
  100.                 return(1);
  101.         }
  102.  
  103.         outData.open("test.txt");
  104. 	if (!outData)
  105.         {
  106.   		cout << "*** Problem with opening test.txt. End program***" << endl;
  107.                 return(2);
  108.          }
  109.  
  110.  
  111.         createMenu(Main_menu, MAIN, msg);
  112.         for (loop = 0; loop < 3; loop ++)
  113.         {        
  114.         outData << " Main menu" << Main_menu[loop].bid << endl;
  115.         outData << " Main menu" << Main_menu[loop].blabel << endl;
  116.         }
  117.  
  118.         inData.close();
  119.         outData.close();
  120.  
  121. 	return 0;
  122. }
<< moderator edit: added [code][/code] tags >>


Input data:

C++ Syntax (Toggle Plain Text) 
  1. 1$Main$1$1$1$        $ ONE     $$1$1
  2. 1$Main$1$1$2$        $ TWO     $$2$1
  3. 1$Main$1$1$3$        $ QUIT    $$3$1
  4. 2$Main$1$1$4$        $ THREE   $$4$2
Attached Files
File Type: txt main_client.cpp.txt (2.9 KB, 5 views)
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Re: Passing array of structures into a function

 
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  #4
Oct 26th, 2005
I got my own answer. Thanks.
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