[핵심 API로 배우는 윈도우프로그래밍(강경우, 한빛아카데미)] 7장 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 FrameWndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam);
LRESULT CALLBACK ChildWndProc(HWND hwnd, 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 = FrameWndProc;
    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 = MAKEINTRESOURCE(IDR_MENU1);
    WndClass.lpszClassName = _T("Window Class Name");
    RegisterClass(&WndClass);
 
    WndClass.lpfnWndProc = ChildWndProc;
    WndClass.lpszMenuName = NULL;
    WndClass.lpszClassName = _T("Child Window Class Name");
    RegisterClass(&WndClass);
 
    hwnd = CreateWindow(
        _T("Window Class Name"),
        _T("Main Window Title"),
        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;
}
 
HWND ActivatedHwndChild;
 
int selection = -1;
int childcount = 0;
static struct CHILD
{
    HWND hwndChild;
    TCHAR str[10][100] = { '\0', };
    int count = 0, line = 0;
};
CHILD child[10];
HWND hwndChild[10] = { 0, };
TCHAR str[10][100] = { '\0', };
int count = 0, line =0;
LRESULT CALLBACK FrameWndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
    static HWND hwndClient;
    
 
    CLIENTCREATESTRUCT clientcreate;
    MDICREATESTRUCT mdicreate;
 
    switch (iMsg)
    {
    case WM_CREATE:
        clientcreate.hWindowMenu = GetSubMenu(GetMenu(hwnd), 0);
        clientcreate.idFirstChild = 100;
        hwndClient = CreateWindow(_T("MDICLIENT"), NULL, WS_CHILD | WS_VISIBLE | WS_CLIPCHILDREN,
            0, 0, 0, 0, hwnd, NULL, hInst, (LPSTR)&clientcreate);
        ShowWindow(hwndClient, SW_SHOW);
        break;
    case WM_COMMAND:
        switch (LOWORD(wParam))
        {
        case ID_FILENEW:
            mdicreate.szClass = _T("Child Window Class Name");
            mdicreate.szTitle = _T("NoName");
            mdicreate.hOwner = hInst;
            mdicreate.style = 0;
            mdicreate.lParam = 0;
            mdicreate.x = CW_USEDEFAULT;
            mdicreate.y = CW_USEDEFAULT;
            mdicreate.cx = CW_USEDEFAULT;
            mdicreate.cy = CW_USEDEFAULT;
            child[childcount++].hwndChild = (HWND)SendMessage(hwndClient, WM_MDICREATE, 0, (LPARAM)(LPMDICREATESTRUCT)&mdicreate);
 
            break;
        
        }
    case WM_MOUSEACTIVATE:
        ActivatedHwndChild = (HWND)SendMessage(hwndClient, WM_MDIGETACTIVE, 0, 0);
        for (int i = 0; i < childcount; i++)
        {
            if (ActivatedHwndChild == child[i].hwndChild)
            {
                selection = i;
                break;
            }
        }
        break;
        
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
 
    }
    return DefFrameProc(hwnd, hwndClient, iMsg, wParam, lParam);
}
 
LRESULT CALLBACK ChildWndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
    HDC hdc;
    PAINTSTRUCT ps;
    TCHAR tmp[20];
    switch (iMsg)
    {
    case WM_CREATE:
        _stprintf_s(tmp, 20, _T("%d"),wParam);
        MessageBox(hwnd, tmp, _T(""), MB_OK);
        break;
    case WM_CHAR:
        if (wParam == VK_RETURN)
        {
            child[selection].line++;
            child[selection].count = 0;
        }
        else if (wParam == VK_BACK)
        {
 
        }
        else
        {
            child[selection].str[child[selection].line][child[selection].count++] = wParam;
 
        }
        InvalidateRgn(ActivatedHwndChild, NULL, TRUE);
        break;
    case WM_PAINT:
        hdc = BeginPaint(ActivatedHwndChild, &ps);
        for (int i = 0; i <= child[selection].line; i++)
            TextOut(hdc, 0, i * 20, child[selection].str[i], _tcslen(child[selection].str[i]));
        EndPaint(ActivatedHwndChild, &ps);
        break;
    case WM_DESTROY:
        break;
    }
    return DefMDIChildProc(hwnd, iMsg, wParam, lParam);
}