Windows-classic-samples/Samples/Win7Samples/multimedia/wia/getimage/ProgressDlg.cpp

/*++

Copyright (c) Microsoft Corporation. All rights reserved.

--*/

#include "stdafx.h"
#include "resource.h"

#include "ProgressDlg.h"

namespace WiaWrap
{

//////////////////////////////////////////////////////////////////////////
//
// CProgressDlg::CProgressDlg
//

CProgressDlg::CProgressDlg(HWND hWndParent)
{
    m_cRef = 0;

	m_hDlg       = NULL;
	m_hWndParent = hWndParent;
	m_bCancelled = FALSE;

    m_hInitDlg = CreateEvent(NULL, FALSE, FALSE, NULL);

    if (m_hInitDlg != NULL)
    {
        // Create the progress dialog in a separate thread so that it
        // remains responsive

	    DWORD dwThreadId;

	    HANDLE hThread = CreateThread(
		    NULL,
		    0,
		    ThreadProc,
		    this,
		    0,
		    &dwThreadId
	    );

        // Wait until the progress dialog is created and ready to process
        // messages. During creation, the new thread will send window messages 
        // to this thread, and this will cause a deadlock if we use 
        // WaitForSingleObject instead of MsgWaitForMultipleObjects

        if (hThread != NULL)
        {
            while (MsgWaitForMultipleObjects(1, &m_hInitDlg, FALSE, INFINITE, QS_ALLINPUT | QS_ALLPOSTMESSAGE) == WAIT_OBJECT_0 + 1)
            {
                MSG msg;

                while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
                {
                    TranslateMessage(&msg);
                    DispatchMessage(&msg);
                }
            }

            CloseHandle(hThread);
        }

        CloseHandle(m_hInitDlg);
    }
}

//////////////////////////////////////////////////////////////////////////
//
// ~CProgressDlg::CProgressDlg
//

CProgressDlg::~CProgressDlg()
{
    EndDialog(m_hDlg, IDCLOSE);
}

//////////////////////////////////////////////////////////////////////////
//
// CProgressDlg::QueryInterface
//

STDMETHODIMP CProgressDlg::QueryInterface(REFIID iid, LPVOID *ppvObj)
{
    if (ppvObj == NULL)
    {
	    return E_POINTER;
    }

    if (iid == IID_IUnknown)
    {
	    *ppvObj = (IUnknown *) this;
    }
    else
    {
        *ppvObj = NULL;
        return E_NOINTERFACE;
    }

	AddRef();
    return S_OK;
}

//////////////////////////////////////////////////////////////////////////
//
// CProgressDlg::AddRef
//

STDMETHODIMP_(ULONG) CProgressDlg::AddRef()
{
    return InterlockedIncrement(&m_cRef);
}

//////////////////////////////////////////////////////////////////////////
//
// CProgressDlg::Release
//

STDMETHODIMP_(ULONG) CProgressDlg::Release()
{
    LONG cRef = InterlockedDecrement(&m_cRef);

    if (cRef == 0)
    {
        delete this;
    }

    return cRef;
}

//////////////////////////////////////////////////////////////////////////
//
// CProgressDlg::Cancelled
//

BOOL CProgressDlg::Cancelled() const
{
    return m_bCancelled;
}

//////////////////////////////////////////////////////////////////////////
//
// CProgressDlg::SetTitle
//

VOID CProgressDlg::SetTitle(PCTSTR pszTitle)
{
	SetWindowText(m_hDlg, pszTitle);
}

//////////////////////////////////////////////////////////////////////////
//
// CProgressDlg::SetMessage
//

VOID CProgressDlg::SetMessage(PCTSTR pszMessage)
{
    SetDlgItemText(m_hDlg, IDC_MESSAGE, pszMessage);
}

//////////////////////////////////////////////////////////////////////////
//
// CProgressDlg::SetPercent
//

VOID CProgressDlg::SetPercent(UINT nPercent)
{
	SendDlgItemMessage(m_hDlg, IDC_PROGRESS_BAR, PBM_SETPOS, (WPARAM) nPercent, 0);	
}

//////////////////////////////////////////////////////////////////////////
//
// CProgressDlg::ThreadProc
//

DWORD WINAPI CProgressDlg::ThreadProc(PVOID pParameter)
{
    CProgressDlg *that = (CProgressDlg *) pParameter;

    INT_PTR nResult = DialogBoxParam(
        g_hInstance,
        MAKEINTRESOURCE(IDD_PROGRESS),
        that->m_hWndParent,
        DialogProc,
        (LPARAM) that
    );
    
    return (DWORD) nResult;
}                  
    
//////////////////////////////////////////////////////////////////////////
//
// CProgressDlg::DialogProc
//

INT_PTR  
CALLBACK 
CProgressDlg::DialogProc(  
    HWND   hDlg,
    UINT   uMsg,
    WPARAM wParam,
    LPARAM lParam
)
{
    switch (uMsg) 
    {
		case WM_INITDIALOG: 
		{
            // Retrieve and store the "this" pointer

			CProgressDlg *that = (CProgressDlg *) lParam;

			SetWindowLongPtr(hDlg, DWLP_USER, (LONG_PTR) that);

			that->m_hDlg = hDlg;

            // Initialize progress bar to the range 0 to 100

			SendDlgItemMessage(hDlg, IDC_PROGRESS_BAR, PBM_SETRANGE32, (WPARAM) 0, (LPARAM) 100);

            // Signal the main thread that we are ready

            SetEvent(that->m_hInitDlg);

			return TRUE;
		}

		case WM_COMMAND: 
		{
			switch (LOWORD(wParam)) 
			{
				case IDCANCEL:
				{
                    // If the user presses the cancel button, set the m_bCancelled flag.

					CProgressDlg *that = (CProgressDlg *) GetWindowLongPtr(hDlg, DWLP_USER);

					InterlockedIncrement(&that->m_bCancelled);

                    // The cancel operation will probably take some time, so 
                    // change the cancel button text to "wait...", so that 
                    // the user will see the cancel command is received and 
                    // is being processed

					TCHAR szWait[DEFAULT_STRING_SIZE] = _T("...");

					LoadString(g_hInstance, IDS_WAIT, szWait, COUNTOF(szWait));

				    SetDlgItemText(hDlg, IDCANCEL, szWait);

					return TRUE;
				}
			}

			break;
		}
    }

    return FALSE;
}

}; // namespace WiaWrap