[핵심 API로 배우는 윈도우프로그래밍(강경우, 한빛아카데미)] 4장 1~3번 풀이

#include <Windows.h>
#include<tchar.h>
#include<stdio.h>
#include<math.h>
#include "resource.h"
LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam);
 
 
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdLine, int nCmdShow)
{
    HWND hwnd;
    MSG msg;
 
    WNDCLASS WndClass;
    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");
    WndClass.lpszMenuName = MAKEINTRESOURCE(IDR_MENU1);
    RegisterClass(&WndClass);
 
    hwnd = CreateWindow(
        _T("Window Class Name"),
        _T("홍길동의 첫 번째 윈도우"),
        WS_OVERLAPPEDWINDOW,
        100, //윈도우 위치 x좌표
        100,//윈도우 위치 y좌표
        1000, //윈도우 가로크기
        1000, //윈도우 세로크기
        NULL, //부모 윈도우핸들
        NULL, //메뉴핸들
        hInstance, //응용프로그램 인스턴스
        NULL); //생성 윈도우 정보
 
    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;
    OPENFILENAME OFN;
    OPENFILENAME SFN;
    int answer;
    TCHAR filter[] = _T("C++소스와 헤더 파일\0*.cpp;*.h\0Every File(*.*)\0*.*\0Text File\0*.txt;*.doc\0");
    TCHAR lpstrFile[100] = _T("");
    static TCHAR str[100];
    static int line = 0;
    FILE *fPtr;
    TCHAR buffer[500];
 
    switch (iMsg)
    {
    case WM_CREATE:
        break;
    case WM_LBUTTONDOWN:
        break;
    case WM_COMMAND:
        switch (LOWORD(wParam))
        {
        case ID_FILENEW:        //새글
            answer = MessageBox(hwnd, _T("새 글을 여시겠습니까?"), _T("새글 선택"), MB_OKCANCEL);
            if (answer == IDOK)
            {
 
            }
            break;
        case ID_FILEOPEN:        //열기                            
 
            memset(&OFN, 0, sizeof(OPENFILENAME));
            OFN.lStructSize = sizeof(OPENFILENAME);
            OFN.hwndOwner = hwnd;
            OFN.lpstrFilter = filter;
            OFN.lpstrFile = lpstrFile;
            OFN.nMaxFile = 256;
            OFN.lpstrInitialDir = _T(".");
            if (GetOpenFileName(&OFN) != 0)
            {
                _stprintf_s(str, _T("%s 파일을 여시겠습니까?"), OFN.lpstrFile);
                answer = MessageBox(hwnd, str, _T("열기선택"), MB_OKCANCEL);
                if (answer == IDOK)
                {
                    hdc = GetDC(hwnd);
#ifdef _UNICODE
                    _tfopen_s(&fPtr, OFN.lpstrFile, _T("r,ccs=UNICODE"));        //파일저장하기->파일 제대로 열리면 0반환
                                                                            //filename : 열고자하는 파일이름
#else                                                        //fPtr : 파일주소 저장
                    _tfopen_s(&file, filename, _T("r"));
#endif
                    while (_fgetts(buffer, 100, fPtr) != NULL)                //fPtr파일에서 한 줄을 읽어와 buffer에 저장, 100은 buffer공간크기
                    {                                                        //파일의 끝을 만날 때까지 줄단위로 buffer에 읽어들임
                        if (buffer[_tcsclen(buffer) - 1] == _T('\n'))        //buffer의 마지막 문자가 개행문자이면 
                            buffer[_tcsclen(buffer) - 1] = NULL;            //NULL로 변경후
                        TextOut(hdc, 0, line * 20, buffer, _tcslen(buffer));//윈도우에 출력
                        line++;
                    }
                    fclose(fPtr);
                    ReleaseDC(hwnd, hdc);
                }
            }
 
            break;
 
        case ID_FILESAVE:        //저장
            hdc = GetDC(hwnd);
            memset(&SFN, 0, sizeof(OPENFILENAME));
            SFN.lStructSize = sizeof(OPENFILENAME);
            SFN.hwndOwner = hwnd;
            SFN.lpstrFilter = filter;
            SFN.lpstrFile = lpstrFile; //파일이름
            SFN.nMaxFile = 256;
            SFN.lpstrInitialDir = _T(".");
            if (GetSaveFileName(&SFN) != 0)
            {
                _stprintf_s(str, _T("%s 파일을 저장하시겠습니까?"), SFN.lpstrFile);
                answer = MessageBox(hwnd, str, _T("저장하기 선택"), MB_OKCANCEL);
                if (answer == IDOK)
                {
                    _tfopen_s(&fPtr, SFN.lpstrFile, _T("wt"));
                    if (fPtr == NULL)
                    {
                        MessageBox(hwnd, _T("파일저장에러"), _T("에러"), MB_OK);
                        break;
                    }
                    for (int i = 0; i < 256; i++)
                    {
                        _fputts(&buffer[i], fPtr);
                        if (feof(fPtr) != 0)
                            break;
                    }
                    fclose(fPtr);
                }
            }
            ReleaseDC(hwnd, hdc);
            break;
        case ID_EDITUNDO:        //편집취소
            MessageBox(hwnd, _T("편집을 취소 하시겠습니까?"), _T("편집취소 선택"), MB_OKCANCEL);
            break;
        case ID_EXIT:            //끝내기
            answer = MessageBox(hwnd, _T("끝내시겠습니까?"), _T("끝내기 선택"), MB_OKCANCEL);
            if (answer == IDOK)
                PostQuitMessage(0);
            break;
        }
        break;
 
    case WM_PAINT:
        hdc = BeginPaint(hwnd, &ps);
        //TextOut(hdc, 0, 0, _T("helloHelloWorld"), _tcslen(_T("helloHelloWorld")));
        EndPaint(hwnd, &ps);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
 
    }
    return DefWindowProc(hwnd, iMsg, wParam, lParam);
}