Design Question

This is a discussion on Design Question within the C++ Programming forums, part of the General Programming Boards category; I am designing a user interface for another program I am writing. This interface displays blanks on the screen for ...

  1. #1
    Master of Puppets rwmarsh's Avatar
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    Design Question

    I am designing a user interface for another program I am writing. This interface displays blanks on the screen for name, address ect... and lets the user tab through the blanks and enter information (well, right now you just hit enter to tab through). If the user hits 'F8' then whatever was typed in is saved to a vector, and if the user hits 'F3' then the program displays the contents of the vector and exits. While the user is typing in information, if the cursor reaches the end of the field (20 spaces long on each one) then the cursor moves down to the next field. Along the same concept, if the user backspaces, characters will be erased until the begining of the field is reached and will go no further. I use another vector to hold the start and end coordinates for each field and as the user enters each character the current cursor position is checked against what is in the vector to determine what to do. What I have works well but I was wondering if there was a better way to do it.
    Code:
    #include <iostream>
    #include <windows.h>
    #include <vector>
    #include <conio.h>
    
    using namespace std;
    
    struct Screen_Locations {
        int position, X1, X2, Y;              
    };
    
    struct Names {
        string name, address, city, state;
    };
    
    void save(Names& names);
    string Read_Cursor(int x, int y, int z);
    static int get_code() {
        int ch = getch();
        if (ch == 0 || ch == 224)
            ch = 256 + getch();
        return ch;
    }
    
    enum {  // system dependent key codes
        ENTER     = 13,
        BACKSPACE = 8,
        F_3       = 317,
        F_8       = 322
    };
    
    int main() {
        Screen_Locations locations;
        vector<Screen_Locations> location_list;
        // Load location_vector with screen coordinates for the fields
        for (int x = 0; x <= 3; x++) {
            locations.position = x;
            locations.X1       = 12;  // start position of x coor
            locations.X2       = 32;  // end position of x coor
            locations.Y        = (x + x);  // start position of y coor
            location_list.push_back(locations);
        }
        vector<Screen_Locations>::const_iterator pos_iter;
        
        Names names;
        vector<Names> name_list;  // all names are saved in this vector
        COORD Position;
        DWORD NumRead;
        HANDLE hOut = GetStdHandle(STD_OUTPUT_HANDLE);
        bool loop = true;  // control for the do..while loop
        int pos;  // variable to keep track of which field the cursor is on
        char ch;
        wchar_t wch;
        do {
            system("cls");
            cout<<"Name     : [                    ]\n\n"
                <<"Address  : [                    ]\n\n"
                <<"City     : [                    ]\n\n"
                <<"State    : [                    ]\n\n"
                <<"<F8> to save, <F3> to exit" <<endl;
            // set cursor to first character of the first field
            pos_iter = location_list.begin();
            Position.X = pos_iter->X1; Position.Y = pos_iter->Y;
            SetConsoleCursorPosition(hOut, Position);
            while (wch = get_code() ) {
                if (wch == F_3) {  // exit the loop and display the names vector
                    loop = false;
                    break;
                }
                else if (wch == F_8) {  // save fields to the names vector
                    save(names);
                    name_list.push_back(names);
                    break;
                } 
                // if user hits the backspace key, go back one character unless
                // the cursor is allready at the first character
                else if (wch == BACKSPACE) {  
                    if (Position.X != pos_iter->X1) {
                        Position.X--;
                        cout<<"\b \b";
                    }
                }
                // if user hits the enter key, move to the next field or back
                // to the first field if the cursor is in the last field allready
                else if (wch == ENTER) {  
                    if (pos == 3)
                        pos = 0;
                    else
                        pos++;
                    pos_iter = location_list.begin() + pos;
                    Position.X = pos_iter->X1;
                    Position.Y = pos_iter->Y;
                    SetConsoleCursorPosition(hOut, Position);
                }
                // if the user enters a character, display that character
                // if the cursor is on the last character of the field then
                // move to the first character of the next field
                if (wch >= 32 && wch <= 126) {
                    ch = wch;
                    cout<<ch;
                    Position.X++;
                    if (Position.X == pos_iter->X2) {
                        pos_iter++;
                        if (pos_iter == location_list.end() )
                            pos_iter = location_list.begin();
                        Position.X = pos_iter->X1; Position.Y = pos_iter->Y;
                        SetConsoleCursorPosition(hOut, Position);
                    }    
                }
            }
        }
        while (loop);
        
        // clear the screen and display the contents of the names vector
        system("cls");
        vector<Names>::iterator iter;
        for (iter = name_list.begin(); iter != name_list.end(); ++iter) 
            cout<<iter->name <<iter->address <<iter->city <<iter->state <<endl;
        cin.get();
        return 0;
    }
    
    // read the contents of a field and return a string                      
    string Read_Cursor(int x, int y, int z) {
        COORD Position;
        DWORD NumRead;
        HANDLE hOut = GetStdHandle(STD_OUTPUT_HANDLE);
        
        Position.X = x;
        Position.Y = y;
        char tempchar[z+1];
        ReadConsoleOutputCharacter(hOut, tempchar, z, Position, &NumRead);
        string tempstring = tempchar;
        return tempstring.assign(tempstring, 0, z);
    }
    
    // save the fields to the names vector
    void save(Names& names) {
        names.name    = Read_Cursor(12, 0, 20);
        names.address = Read_Cursor(12, 2, 20);
        names.city    = Read_Cursor(12, 4, 20);
        names.state   = Read_Cursor(12, 6, 20);
        return;
    }
    BTW, I know that using system commands is not exactly portable, but I am just getting the design aspect right now. I'll go back after and and figure something else out for that.

    Thanx!
    Using DEV-C++ Under Windows XP
    +------------------------------+

    "No! Do, or Do Not. There is no Try..."

  2. #2
    Devil's Advocate SlyMaelstrom's Avatar
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    BTW, I know that using system commands is not exactly portable, but I am just getting the design aspect right now. I'll go back after and and figure something else out for that.
    You mean not exactly secure... portability went out the window when you included windows.h.

    What you have seems pretty good. I think the save function would for better as a method of the names class, but that's your call. Also, I think it's pointless including conio.h as windows.h, I believe, has it's own versions of all of conio's functions. Look into some documentation.
    Sent from my iPadŽ

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