[핵심 API로 배우는 윈도우프로그래밍(강경우, 한빛아카데미)] 6장 3번 풀이

#include <Windows.h>
#include<tchar.h>
#include<string.h>
#include<math.h>
#include"resource.h"
//#pragma comment(linker,"/entry:WinMainCRTStartup /subsystem:console")
LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam);
BOOL CALLBACK DlgFunc(HWND hDlg, UINT iMsg, WPARAM wParam, LPARAM lParam);
HINSTANCE hInst;
 
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdLine, int nCmdShow)
{
    HWND hwnd;
    MSG msg;
    WNDCLASS WndClass;
 
    hInst = hInstance;
    WndClass.style = CS_HREDRAW | CS_VREDRAW;
    WndClass.lpfnWndProc = WndProc;
    WndClass.cbClsExtra = 0;
    WndClass.cbWndExtra = 0;
    WndClass.hInstance = hInstance;
    WndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    WndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
    WndClass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    WndClass.lpszMenuName = NULL;
    WndClass.lpszClassName = _T("Window Class Name");
 
    RegisterClass(&WndClass);
 
    hwnd = CreateWindow(
        _T("Window Class Name"),
        _T("박정호"),
        WS_OVERLAPPEDWINDOW,
        50,
        50,
        1000,
        700,
        NULL,
        NULL,
        hInstance,
        NULL);
 
    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);
 
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return (int)msg.wParam;
}
 
LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
    HDC hdc;
    PAINTSTRUCT ps;
    switch (iMsg)
    {
    case WM_CREATE:
        break;
    case WM_LBUTTONDOWN:
        DialogBox(hInst, MAKEINTRESOURCE(IDD_DIALOG3), hwnd, DlgFunc);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
 
    }
    return DefWindowProc(hwnd, iMsg, wParam, lParam);
}
 
BOOL CALLBACK DlgFunc(HWND hDlg, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
    TCHAR text[30];
    int num1, num2;
    double result;
    switch (iMsg)
    {
    case WM_INITDIALOG:
        break;
    case WM_COMMAND:
        switch (LOWORD(wParam))
        {
        case IDC_BUTTON_PLUS:
            num1 = GetDlgItemInt(hDlg, IDC_EDIT1, NULL, TRUE);
            num2 = GetDlgItemInt(hDlg, IDC_EDIT2, NULL, TRUE);
            result = num1 + num2;
            SetDlgItemInt(hDlg, IDC_EDIT3, result, 1);
            break;
        case IDC_BUTTON_MINUS:
            num1 = GetDlgItemInt(hDlg, IDC_EDIT1, NULL, TRUE);
            num2 = GetDlgItemInt(hDlg, IDC_EDIT2, NULL, TRUE);
            result = num1 - num2;
            SetDlgItemInt(hDlg, IDC_EDIT3, result, 1);
            break;
        case IDC_BUTTON_MULTI:
            num1 = GetDlgItemInt(hDlg, IDC_EDIT1, NULL, TRUE);
            num2 = GetDlgItemInt(hDlg, IDC_EDIT2, NULL, TRUE);
            result = num1 * num2;
            SetDlgItemInt(hDlg, IDC_EDIT3, result, 1);
            break;
        case IDC_BUTTON_DIVISE:
            num1 = GetDlgItemInt(hDlg, IDC_EDIT1, NULL, TRUE);
            num2 = GetDlgItemInt(hDlg, IDC_EDIT2, NULL, TRUE);
            result = num1 / (float)num2;
            _stprintf_s(text, _T("%lf"), result);
            SetDlgItemText(hDlg, IDC_EDIT3, text);
            break;
        case IDCANCEL:
            EndDialog(hDlg, 0);
            break;
        case IDCLOSE:
            EndDialog(hDlg, 0);
            break;
        }
        break;
    }
    return 0;
}