PS - First Test #2

// WindowsProject3.cpp : Defines the entry point for the application.
//

#include "framework.h"
#include "WindowsProject3.h"
#include <CommCtrl.h>
#include <stdio.h>

#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE hInst;                                // current instance
WCHAR szTitle[MAX_LOADSTRING];                  // The title bar text
WCHAR szWindowClass[MAX_LOADSTRING];            // the main window class name

// Forward declarations of functions included in this code module:
ATOM                MyRegisterClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK    About(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK    Dialog(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK    Timer(HWND, UINT, WPARAM, LPARAM);

int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
                     _In_opt_ HINSTANCE hPrevInstance,
                     _In_ LPWSTR    lpCmdLine,
                     _In_ int       nCmdShow)
{
    UNREFERENCED_PARAMETER(hPrevInstance);
    UNREFERENCED_PARAMETER(lpCmdLine);

    // TODO: Place code here.

    // Initialize global strings
    LoadStringW(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
    LoadStringW(hInstance, IDC_WINDOWSPROJECT3, szWindowClass, MAX_LOADSTRING);
    MyRegisterClass(hInstance);

    // Perform application initialization:
    if (!InitInstance (hInstance, nCmdShow))
    {
        return FALSE;
    }

    HACCEL hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_WINDOWSPROJECT3));

    MSG msg;

    // Main message loop:
    while (GetMessage(&msg, nullptr, 0, 0))
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }

    return (int) msg.wParam;
}



//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEXW wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);

    wcex.style          = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc    = WndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 0;
    wcex.hInstance      = hInstance;
    wcex.hIcon          = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_WINDOWSPROJECT3));
    wcex.hCursor        = LoadCursor(nullptr, IDC_ARROW);
    wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName   = MAKEINTRESOURCEW(IDC_WINDOWSPROJECT3);
    wcex.lpszClassName  = szWindowClass;
    wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

    return RegisterClassExW(&wcex);
}

//
//   FUNCTION: InitInstance(HINSTANCE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   hInst = hInstance; // Store instance handle in our global variable

   HWND hWnd = CreateWindowW(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, nullptr, nullptr, hInstance, nullptr);

   if (!hWnd)
   {
      return FALSE;
   }

   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);

   return TRUE;
}

//
//  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
//  PURPOSE: Processes messages for the main window.
//
//  WM_COMMAND  - process the application menu
//  WM_PAINT    - Paint the main window
//  WM_DESTROY  - post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_COMMAND:
        {
            int wmId = LOWORD(wParam);
            // Parse the menu selections:
            switch (wmId)
            {
            case IDM_ABOUT:
                DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
                break;
            case ID_DIALOGANDTIMER_DIALOG:
                DialogBox(hInst, MAKEINTRESOURCE(IDD_DIALOG1), hWnd, Dialog);
                break;
            case ID_DIALOGANDTIMER_TIMER:
                DialogBox(hInst, MAKEINTRESOURCE(IDD_DIALOG2), hWnd, Timer);
                break;
            case IDM_EXIT:
                DestroyWindow(hWnd);
                break;
            default:
                return DefWindowProc(hWnd, message, wParam, lParam);
            }
        }
        break;
    case WM_PAINT:
        {
            PAINTSTRUCT ps;
            HDC hdc = BeginPaint(hWnd, &ps);
            // TODO: Add any drawing code that uses hdc here...
            EndPaint(hWnd, &ps);
        }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

// Message handler for about box.
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
    UNREFERENCED_PARAMETER(lParam);
    switch (message)
    {
    case WM_INITDIALOG:
        return (INT_PTR)TRUE;

    case WM_COMMAND:
        if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
        {
            EndDialog(hDlg, LOWORD(wParam));
            return (INT_PTR)TRUE;
        }
        break;
    }
    return (INT_PTR)FALSE;
}

INT_PTR CALLBACK Dialog(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
    char data[100], result[100], * stopstring = nullptr;
    float a = 0, b = 0, c = 0, math = 0;
    int cbIndex = 0, lbIndex = 0;
    BOOL* LPt = NULL;
    BOOL SIG = FALSE;
    UNREFERENCED_PARAMETER(lParam);
    switch (message)
    {
    case WM_INITDIALOG:
        SendDlgItemMessage(hDlg, IDC_COMBO1, CB_ADDSTRING, 0, (LPARAM)"-3");
        SendDlgItemMessage(hDlg, IDC_COMBO1, CB_ADDSTRING, 0, (LPARAM)"3.3");
        return (INT_PTR)TRUE;

    case WM_COMMAND:
        if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
        {
            EndDialog(hDlg, LOWORD(wParam));
            return (INT_PTR)TRUE;
        }
        else if (LOWORD(wParam) == IDC_BUTTON1)
        {
            GetDlgItemText(hDlg, IDC_EDIT1, data, sizeof(data));
            if (!(SendDlgItemMessage(hDlg, IDC_LIST1, LB_FINDSTRING, 0, (LPARAM)data) > -1))
            {
                cbIndex = SendDlgItemMessage(hDlg, IDC_LIST1, LB_ADDSTRING, 0, (LPARAM)data);
                SendDlgItemMessage(hDlg, IDC_LIST1, LB_GETCURSEL, cbIndex, 0);
            }
        }
        else if (LOWORD(wParam) == IDC_BUTTON2)
        {
            if (IsDlgButtonChecked(hDlg, IDC_RADIO1))
            {

                a = GetDlgItemInt(hDlg, IDC_EDIT2, LPt, SIG);
                b = GetDlgItemInt(hDlg, IDC_EDIT3, LPt, SIG);
                lbIndex = SendDlgItemMessage(hDlg, IDC_COMBO1, LB_GETCURSEL, 0, 0);
                if (lbIndex > -1)
                {
                    SendDlgItemMessage(hDlg, IDC_COMBO1, CB_GETLBTEXT, lbIndex, (LPARAM)data);
                }
                c = strtod(data, &stopstring);
                if (((a)+(b)) == 0)
                {
                    MessageBox(hDlg, "Cant divide by 0", "ERROR", MB_OK);
                    break;
                }
                math = c/(a + b);
                sprintf_s(result, "%6.3f", math);
                SetDlgItemText(hDlg, IDC_EDIT4, result);
            }
            else if (IsDlgButtonChecked(hDlg, IDC_RADIO2))
            {

                a = GetDlgItemInt(hDlg, IDC_EDIT2, LPt, SIG);
                b = GetDlgItemInt(hDlg, IDC_EDIT3, LPt, SIG);
                lbIndex = SendDlgItemMessage(hDlg, IDC_COMBO1, CB_GETCURSEL, 0, 0);
                if (lbIndex > -1)
                {
                    SendDlgItemMessage(hDlg, IDC_COMBO1, CB_GETLBTEXT, lbIndex, (LPARAM)data);
                }
                c = strtod(data, &stopstring);
                if (c  == 0)
                {
                    MessageBox(hDlg, "Cant divide by 0", "ERROR", MB_OK);
                    break;
                }
                math = (c + b) / c;
                sprintf_s(result, "%6.3f", math);
                SetDlgItemText(hDlg, IDC_EDIT4, result);
            }
        }
        break;
    }
    return (INT_PTR)FALSE;
}

INT_PTR CALLBACK Timer(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
    static int step = 5;
    UNREFERENCED_PARAMETER(lParam);
    switch (message)
    {
    case WM_INITDIALOG:
        return (INT_PTR)TRUE;

    case WM_COMMAND:
        if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
        {
            EndDialog(hDlg, LOWORD(wParam));
            return (INT_PTR)TRUE;
        }
        if (LOWORD(wParam) == IDC_BUTTON1)
        {
            SetTimer(hDlg, TIMER1, 20, NULL);
        }
        break;
    }


    return (INT_PTR)FALSE;
}