[핵심 API로 배우는 윈도우프로그래밍(강경우, 한빛아카데미)] 7장 4번 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;
HWND hwndChild[4];
 
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 = NULL;
    WndClass.lpszClassName = _T("Window Class Name");
    RegisterClass(&WndClass);
 
    WndClass.lpfnWndProc = ChildWndProc;
    WndClass.lpszClassName = _T("Child 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 FrameWndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
    HDC hdc;
    RECT rect;
    switch (iMsg)
    {
    case WM_CREATE:
        break;
 
    case WM_LBUTTONDOWN:
        GetClientRect(hwnd, &rect);
        hwndChild[0] = CreateWindowEx(WS_EX_CLIENTEDGE, _T("Child Window Class Name"), NULL, WS_CHILD | WS_VISIBLE, 0, 0, rect.right / 2 - 1, rect.bottom / 2 - 1, hwnd, NULL, hInst, NULL);
        hwndChild[1] = CreateWindowEx(WS_EX_CLIENTEDGE, _T("Child Window Class Name"), NULL, WS_CHILD | WS_VISIBLE, rect.right/2+1, 0, rect.right / 2 - 1, rect.bottom / 2 - 1, hwnd, NULL, hInst, NULL);
        hwndChild[2] = CreateWindowEx(WS_EX_CLIENTEDGE, _T("Child Window Class Name"), NULL, WS_CHILD | WS_VISIBLE, 0, rect.bottom/2+1, rect.right / 2 - 1, rect.bottom / 2 - 1, hwnd, NULL, hInst, NULL);
        hwndChild[3] = CreateWindowEx(WS_EX_CLIENTEDGE, _T("Child Window Class Name"), NULL, WS_CHILD | WS_VISIBLE, rect.right/2+1, rect.bottom / 2 + 1, rect.right / 2 - 1, rect.bottom / 2 - 1, hwnd, NULL, hInst, NULL);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
 
    }
    return DefWindowProc(hwnd, iMsg, wParam, lParam);
}
LRESULT CALLBACK ChildWndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
 
 
    return DefMDIChildProc(hwnd, iMsg, wParam, lParam);
}