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Oct 24th, 2005
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Passing array of structures into a function

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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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amy590 is offline Offline
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Oct 24th, 2005
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Re: Passing array of structures into a function

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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Dave Sinkula is offline Offline
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Oct 25th, 2005
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Re: Passing array of structures into a function

Quote 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, 31 views)
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amy590 is offline Offline
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Oct 26th, 2005
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Re: Passing array of structures into a function

I got my own answer. Thanks.
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amy590 is offline Offline
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This thread is more than three months old

No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.
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