[핵심 API로 배우는 윈도우프로그래밍(강경우, 한빛아카데미)] 8장 3~4번 풀이

#include <Windows.h>
#include<tchar.h>
#include<string.h>
#include"resource.h"
#include<winres.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);
void ReadFromFile(int WndIndex, TCHAR filename[]);
void SaveFromFile(HWND hwnd, TCHAR filename[]);
 
int SelectWnd;
int WndCount;
RECT rt[100];
HWND hwndChild[100];        //각 자식윈도우의 핸들
static HWND hEdit[100];
TCHAR WinBuff[100][1000];    //불러온 파일내용을 읽어들여 저장할 버퍼공간
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(                    //프레임 윈도우 생성
        _T("Window Class Name"),
        _T("박정호"),
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        NULL,
        NULL,
        hInstance,
        NULL);
 
    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);
 
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return (int)msg.wParam;
}
#define IDC_EDIT1 100
LRESULT CALLBACK FrameWndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
    static HWND hwndClient;
    CLIENTCREATESTRUCT clientcreate;
    MDICREATESTRUCT mdicreate;
    static TCHAR filepath[1000], folder[100], filename[100];
    TCHAR filter[] = _T("텍스트 파일 (*.txt)\0*.txt\0모든 파일 (*.*)\0*.*\0");
    OPENFILENAME OFN,SFN;
 
    switch (iMsg)
    {
    case WM_CREATE:
        clientcreate.hWindowMenu = GetSubMenu(GetMenu(hwnd), 0);
        clientcreate.idFirstChild = 100;
        hwndClient = CreateWindow(            //클라이언트 윈도우 생성
            _T("MDICLIENT"), NULL, WS_CHILD | WS_CLIPCHILDREN | WS_VISIBLE,
            0, 0, 0, 0,
            hwnd, NULL, hInst, (LPSTR)&clientcreate);
        ShowWindow(hwndClient, SW_SHOW);    //프레임 윈도우에 클라이언트 윈도우가 나타남
        return 0;
        break;
    case WM_COMMAND:
        switch (LOWORD(wParam))
        {
        case ID_FILEOPEN:
            memset(&OFN, 0, sizeof(OPENFILENAME));
            OFN.lStructSize = sizeof(OPENFILENAME);
            OFN.hwndOwner = hwnd;
            OFN.lpstrFile = filepath;        //사용자가 선택한 파일경로
            OFN.nMaxFile = 1000;            //파일경로의 최대크기
 
            OFN.lpstrFileTitle = filename;    //사용자가 선택한 파일제목
            OFN.nMaxFileTitle = 100;        //파일제목의 최대크기
 
            OFN.lpstrFilter = filter;
            OFN.Flags = OFN_EXPLORER;        //파일을 하나만 선택가능
            OFN.lpstrInitialDir = _T(".");
            GetOpenFileName(&OFN);            //OFN구조체의 내용을 기반으로 [열기]대화상자를 초기화하고,
                                            //사용자가 선택한 파일의 정보가 저장되고 파일선택시 1반환
            WndCount++;
            ReadFromFile(WndCount, filepath);//파일로부터 텍스트를 읽어들인다
            mdicreate.szClass = _T("Child Window Class Name");
            mdicreate.szTitle = filename;
            mdicreate.hOwner = hInst;
            mdicreate.x = CW_USEDEFAULT;
            mdicreate.y = CW_USEDEFAULT;
            mdicreate.cx = CW_USEDEFAULT;
            mdicreate.cy = CW_USEDEFAULT;
            mdicreate.style = 0;
            mdicreate.lParam = 0;
            hwndChild[WndCount] = (HWND)SendMessage(hwndClient, WM_MDICREATE, 0, (LPARAM)(LPMDICREATESTRUCT)&mdicreate);
            //클라이언트 윈도우에게 mdicreate의 내용을 가지고 자식 윈도우를 만들라는 메시지
            hEdit[WndCount] = CreateWindow(
                _T("edit"), NULL, WS_CHILD | WS_VISIBLE | WS_HSCROLL | WS_VSCROLL |    //에디트 컨트롤 생성
                ES_AUTOHSCROLL | ES_AUTOVSCROLL | ES_MULTILINE, 0, 100,
                rt[WndCount].right, rt[WndCount].bottom, hwndChild[WndCount], (HMENU)IDC_EDIT1, hInst, NULL);
            GetClientRect(hwndChild[WndCount], &rt[WndCount]);
            MoveWindow(hEdit[SelectWnd], 0, 0, rt[SelectWnd].right, rt[SelectWnd].bottom, TRUE);
            return 0;
        case ID_FILESAVE:
            memset(&SFN, 0, sizeof(OPENFILENAME));
            SFN.lStructSize = sizeof(OPENFILENAME);
            SFN.hwndOwner = hwnd;
            SFN.lpstrFilter = filter;
            SFN.lpstrFile = filepath;
            SFN.nMaxFile = 1000;
            OFN.lpstrFileTitle = filename;
            OFN.nMaxFileTitle = 100;        
            SFN.lpstrInitialDir = _T(".");
            GetSaveFileName(&SFN);
            SaveFromFile(hEdit[SelectWnd], filepath);
            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;
 
    for (int i = 1; i <= WndCount; i++)
    {
        if (hwnd == hwndChild[i])
        {
            SelectWnd = i;
            break;
        }
    }
 
    switch (iMsg)
    {
    case WM_CREATE:
        break;
    case WM_PAINT:
        SetWindowText(hEdit[SelectWnd], WinBuff[SelectWnd]);
        break;
    case WM_SIZE:
        GetClientRect(hwnd, &rt[SelectWnd]);
        MoveWindow(hEdit[SelectWnd], 0, 0, rt[SelectWnd].right, rt[SelectWnd].bottom, TRUE);
        break;
    case WM_DESTROY:
        break;
    }
    return DefMDIChildProc(hwnd, iMsg, wParam, lParam);
}
void ReadFromFile(int WndIndex, TCHAR filename[])
{
    HANDLE hFile;
    DWORD size = 1000;
    hFile = CreateFile(filename, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, 0);
    ReadFile(hFile, WinBuff[WndIndex], size * sizeof(TCHAR), &size, NULL);
    WinBuff[WndIndex][size] = NULL;
    CloseHandle(hFile);
}
void SaveFromFile(HWND hwnd, TCHAR filename[])
{
    HANDLE hFile;
    LPTSTR buffer;
    int size;
 
    hFile = CreateFile(filename, GENERIC_WRITE, 0, 0,                        //1.파일 생성(파일에 텍스트를 저장해야하기때문에 GENERIC_WRITE사용
        CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
 
    size = GetWindowTextLength(hwnd);                                        //버퍼 크기 결정위해 에디트컨트롤 텍스트의 길이 얻어옴
    buffer = new TCHAR[size + 1];
    memset(buffer, 0, (size + 1) * sizeof(TCHAR));
    size = GetWindowText(hwnd, (LPTSTR)buffer, size + 1);                    //에디트 컨트롤의 텍스트->버퍼 읽어들이기
    buffer[size] = NULL;
    WriteFile(hFile, buffer, size * sizeof(TCHAR), (LPDWORD)&size, NULL);    //2.파일 쓰기(버퍼->파일 저장)
    free(buffer);
    CloseHandle(hFile);
}