Windows 창 투명화 프로그램

// Set WS_EX_LAYERED on this Windows
SetWindowLong(hWnd, GWL_EXSTYLE, GetWindowLong(hWnd, GWL_EXSTYLE) | WS_EX_LAYERED);
// Make this window 70% alpha
SetLayeredWindowAttributes(hWnd, 0, (255 * 70) / 100, LWA_ALPHA);

BOOL CALLBACK EnumWindowsProc(HWND hWnd, LPARAM lparam)
{
    ...
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    ...

    // All Windows Iteration
    EnumWindows(EnumWindowsProc, NULL);

    ...
}

// 전역변수
HWND hWndOld, hWndActive;                       // 활성화된 창 저장
UINT const WMAPP_NOTIFYCALLBACK = WM_APP + 1;   // 사용자정의 콜백함수
POINT gpt;                                      // 마우스
int ACTIVE = 90;
int INACTIVE = 50;

// 타이머마다 호출되는 콜백함수
BOOL CALLBACK EnumWindowsProc(HWND hWnd, LPARAM lparam) {
    // 안 보이는 창 필터링
    if (!IsWindowVisible(hWnd)) {
        return TRUE;
    }
    // 부모가 바탕화면인지
    if (GetParent(hWnd) != 0) {
        return TRUE;
    }
    // 최소화된 창 건너뛰기
    if (IsIconic(hWnd)) {
        return TRUE;
    }
    // 마우스 영역 추출
    RECT rt;
    GetWindowRect(hWnd, &rt);

    try
    {
        // set WS_EX_LAYERED on this Window
        SetWindowLong(hWnd, GWL_EXSTYLE, GetWindowLong(hWnd, GWL_EXSTYLE) | WS_EX_LAYERED);
        // Current active windows ALPHA ACTIVE%, else windows INACTIVE%
        if (hWnd == hWndActive | IsCurInRect(rt)) {
            SetLayeredWindowAttributes(hWnd, 0, (255 * ACTIVE) / 100, LWA_ALPHA);
        }
        else {
            SetLayeredWindowAttributes(hWnd, 0, (255 * INACTIVE) / 100, LWA_ALPHA);
        }
    }
    catch (...)
    {
        return FALSE;
    }
    return TRUE;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_CREATE:
    {
        // Initialization
        // Get Current Active Window
        hWndActive = GetForegroundWindow();
        // All Windows Iteration
        EnumWindows(EnumWindowsProc, NULL);
        // Old Pointer
        hWndOld = GetForegroundWindow();

        // add the notification icon
        if (!AddNotificationIcon(hWnd))
        {
            MessageBox(hWnd,
                L"Please read the ReadMe.txt file for troubleshooting",
                L"Error adding icon", MB_OK);
            return -1;
        }

        // add the notification popup
        AddNotificationPopup(hWnd);


        SetTimer(hWnd,                      // handle to main window
            1,                              // timer identifier
            200,                            // 0.2-second interval
            (TIMERPROC)NULL);               // no timer callback
    }
    break;
    case WM_COMMAND:
    {
        // MENU ID <<====>> COMMAND
    }
    break;
    case WM_TIMER:
    {
        // Get Current Active Window
        hWndActive = GetForegroundWindow();

        // Get Mouse Capture Window
        GetCursorPos(&gpt);

        // All Windows Iteration
        EnumWindows(EnumWindowsProc, NULL);

        // Old Pointer
        hWndOld = hWndActive;
    }
    break;
    case WMAPP_NOTIFYCALLBACK:
    {
        switch (lParam)
        {
        case WM_CONTEXTMENU:
        {
            ShowContextMenu(hWnd, gpt);
        }
        break;
        }
    }
    break;
    case WM_DESTROY:
        EnumWindows(EnumWindowsProcBack, NULL);
        KillTimer(hWnd, 1);
        DeleteNotificationIcon();
        DestroyWindow(hWnd);
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
}