#include <windows.h>
#include "..resource.h"
LRESULT CALLBACK FrameWndProc(HWND hwnd, UINT iMsg,
WPARAM wParam, LPARAM lParam);
LRESULT CALLBACK ChildWndProc(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 = FrameWndProc;
WndClass.cbClsExtra = 0;
WndClass.cbWndExtra = 0;
WndClass.hInstance = hInstance;
WndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
WndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
WndClass.hbr = (HBRUSH)GetStockObject(WHITE_BRUSH);
WndClass.lpszMenuName = MAKEINTRESOURCE(IDR_MENU7_6);
WndClass.lpszClassName = "Window Class Name";
RegisterClass(&WndClass);
WndClass.lpfnWndProc = ChildWndProc;
WndClass.lpszMenuName = NULL;
WndClass.lpszClassName = "Child Window Class Name";
RegisterClass(&WndClass) ;
hwnd = CreateWindow("Window Class Name",
"Main Window Title",
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;
}

HWND ChildHwnd[2];
LRESULT CALLBACK FrameWndProc(HWND hwnd, UINT iMsg,
WPARAM wParam, LPARAM lParam)
{
static BOOL split;
static HCURSOR hCursor;
static int boundary = -1;
RECT rectView;

switch (iMsg)
{
case WM_CREATE:
split = FALSE;
return 0;
case WM_COMMAND:
switch(LOWORD(wParam))
{
case ID_SPLIT_2_1:
if (split == TRUE) break;
split = TRUE;
GetClientRect(hwnd, &rectView);
ChildHwnd[0] = CreateWindowEx(
WS_EX_CLIENTEDGE,
"Child Window Class Name",
NULL,
WS_CHILD | WS_VISIBLE,
0,
0,
rectView.right,
rectView.bottom/2-1,
hwnd,
NULL,
hInst,
NULL
);
ChildHwnd[1] = CreateWindowEx(
WS_EX_CLIENTEDGE,
"Child Window Class Name",
NULL,
WS_CHILD | WS_VISIBLE,
0,
rectView.bottom/2+1,
rectView.right,
rectView.bottom/2-1,
hwnd,
NULL,
hInst,
NULL
);
boundary = rectView.bottom/2;
hCursor = LoadCursor(NULL, MAKEINTRESOURCE(IDC_SIZENS));
return 0;
case ID_EXIT :
PostQuitMessage(0);
return 0 ;
}
return 0;
case WM_MOUSEMOVE:
if (HIWORD(lParam)>=boundary-2 && HIWORD(lParam)<=boundary+2) SetCursor(hCursor);
if (wParam == MK_LBUTTON && split == TRUE)
{
GetClientRect(hwnd, &rectView);
if (rectView.top+5 < HIWORD(lParam) && HIWORD(lParam) < rectView.bottom-5)
boundary = HIWORD(lParam);
MoveWindow(ChildHwnd[0], 0, 0, rectView.right, boundary - 1, TRUE);
MoveWindow(ChildHwnd[1], 0, boundary+1, rectView.right, rectView.bottom - boundary + 1, TRUE);
}
return 0;
case WM_LBUTTONDOWN:
if (split == TRUE)
{
SetCursor(hCursor);
SetCapture(hwnd);
}
return 0;
case WM_LBUTTONUP:
if (split == TRUE) ReleaseCapture();
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, iMsg, wParam, lParam);
}

LRESULT CALLBACK ChildWndProc(HWND hwnd, UINT iMsg,
WPARAM wParam, LPARAM lParam)
{
HDC hdc;
static int x[2] = {20, 20}, y[2]={20, 20}, flag[2];
int select;

switch (iMsg)
{
case WM_CREATE:
break;
case WM_TIMER:
x[wParam] = x[wParam] + 20;
hdc = GetDC(hwnd);
Ellipse(hdc, x[wParam] - 20, y[wParam] - 20,
x[wParam] + 20, y[wParam] + 20);
ReleaseDC(hwnd, hdc);
break;
case WM_LBUTTONDOWN:
if (hwnd == ChildHwnd[0])
select = 0;
else
select = 1;
flag[select] = 1 - flag[select];
if (flag[select])
SetTimer(hwnd, select, 100, NULL);
else
KillTimer(hwnd, select);
break;
case WM_DESTROY:
return 0;
}
return DefMDIChildProc(hwnd, iMsg, wParam, lParam);
}
자식윈도우 2개 중하나를 클릭하면 그 윈도내에서 원이 오른쪽으로 이동하는 예제인데요
WM_LBUTTONDOWN 되면 윈도가 위에것인지 아랫것인지 어케아나요? 이해가 안되네요..

이벤트가 발생하면 ChildWndProc에 hwnd에 자식윈도 핸들값이 전달되어서 메시지가 처리되는거 맞나요?
그럼 이벤트가 어디서 발생한지 어케알어시팔..
또 모든 자식 윈도우는 ChildWndProc에서 처리되나요? ChildWndProc1 ChildWndProc2 이렇게 여러개는 어케함