divfile.cpp

上传的代码是WindowsCEProgramming第一版的源代码

//======================================================================
// DivFile - A Windows CE file filter DLL
//
// Written for the book Programming Windows CE
// Copyright (C) 1998 Douglas Boling
//======================================================================
#include <windows.h>                 // For all that Windows stuff

#define INITGUID
#include <initguid.h>                // GUID defines
#include <replfilt.h>                // Required for file filters
#include <rapi.h>                    // Required for RAPI functions

#include "DivFile.h"

HINSTANCE hInst;                     // DLL instance handle
long g_DllCnt = 0;                   // Global DLL reference count

// Replace this GUID with your own!
// {2B06F7A1-088E-11d2-93F1-204C4F4F5020}
static const GUID CLSID_MyCopyFilter =
{0x2b06f7a1, 0x88e, 0x11d2, {0x93,0xf1,0x20,0x4c,0x4f,0x4f,0x50,0x20}};

//======================================================================
// DllMain - DLL initialization entry point
//
BOOL WINAPI DllMain (HINSTANCE hinstDLL, DWORD dwReason,
                     LPVOID lpvReserved) {
    hInst = hinstDLL;
    return TRUE;
}
//======================================================================
// DllGetClassObject - Exported function called to get pointer to
// Class factory object
//
STDAPI DllGetClassObject (REFCLSID rclsid, REFIID riid, LPVOID *ppv) {
    MyClassFactory *pcf;
    HRESULT hr;

    // See if caller wants us....
    if (IsEqualCLSID (rclsid, CLSID_MyCopyFilter)) {

        // Create class factory object.
        pcf = new MyClassFactory();
        if (pcf == NULL)
            return E_OUTOFMEMORY;

        // Call class factory's query interface method.
        hr = pcf->QueryInterface (riid, ppv);
        // This will cause an object delete unless interface found.
        pcf->Release();
        return hr;
    }
    return CLASS_E_CLASSNOTAVAILABLE;
}
//======================================================================
// DllCanUnloadNow - Exported function called when DLL can unload
//
STDAPI DllCanUnloadNow () {

    if (g_DllCnt)
        return S_FALSE;

    return S_OK;
}
//**********************************************************************
// MyClassFactory Object implementation
//----------------------------------------------------------------------
// Object constructor
MyClassFactory::MyClassFactory () {

    m_lRef = 1;     // Set ref count to 1 on create.
    g_DllCnt++;
    return;
}
//----------------------------------------------------------------------
// Object destructor
MyClassFactory::~MyClassFactory () {
    g_DllCnt--;
    return;
}
//----------------------------------------------------------------------
// QueryInterface - Called to see what interfaces this object supports
STDMETHODIMP MyClassFactory::QueryInterface (THIS_ REFIID riid,
                                             LPVOID *ppv) {

    // If caller wants our IUnknown or IClassFactory object,
    // return a pointer to the object.
    if (IsEqualIID (riid, IID_IUnknown) ||
        IsEqualIID (riid, IID_IClassFactory)){

        *ppv = (IClassFactory *)this;     // Return pointer to object.
        AddRef();                // Inc ref to prevent delete on return.
        return NOERROR;
    }
    *ppv = NULL;
    return (E_NOINTERFACE);
}
//----------------------------------------------------------------------
// AddRef - Increment object ref count.
STDMETHODIMP_(ULONG) MyClassFactory::AddRef (THIS) {
    ULONG cnt;

    cnt = (ULONG)InterlockedIncrement (&m_lRef);
    return cnt;
}
//----------------------------------------------------------------------
// Release - Decrement object ref count.
STDMETHODIMP_(ULONG) MyClassFactory::Release (THIS) {
    ULONG cnt;

    cnt = (ULONG)InterlockedDecrement (&m_lRef);
    if (cnt == 0) {
        delete this;
        return 0;
    }
    return cnt;
}
//----------------------------------------------------------------------
// LockServer - Called to tell the DLL not to unload even if use cnt 0
STDMETHODIMP MyClassFactory::LockServer (BOOL fLock) {
    if (fLock)
        InterlockedIncrement (&g_DllCnt);
    else
        InterlockedDecrement (&g_DllCnt);

    return NOERROR;
}
//----------------------------------------------------------------------
// CreateInstance - Called to have class factory object create other
// objects
STDMETHODIMP MyClassFactory::CreateInstance (LPUNKNOWN pUnkOuter,
                                             REFIID riid,
                                             LPVOID *ppv) {
    MyFileFilter *pMyff;
    HRESULT hr;

    if (pUnkOuter)
        return (CLASS_E_NOAGGREGATION);

    if (IsEqualIID (riid, IID_IUnknown) ||
        IsEqualIID (riid, IID_ICeFileFilter)) {

        // Create file filter object.
        pMyff = new MyFileFilter();
        if (!pMyff)
            return E_OUTOFMEMORY;

        // See if object exports the proper interface.
        hr = pMyff->QueryInterface (riid, ppv);
        // This will cause an object delete unless interface found.
        pMyff->Release ();
        return hr;
    }
    return E_NOINTERFACE;
}
//**********************************************************************
// MyFileFilter Object implementation
//----------------------------------------------------------------------
// Object constructor
MyFileFilter::MyFileFilter () {

    m_lRef = 1;     // Set ref count to 1 on create.
    return;
}
//----------------------------------------------------------------------
// Object destructor
MyFileFilter::~MyFileFilter () {
    return;
}
//----------------------------------------------------------------------
// QueryInterface - Called to see what interfaces this object supports
STDMETHODIMP MyFileFilter::QueryInterface (THIS_ REFIID riid,
                                             LPVOID *ppv) {

    // If caller wants our IUnknown or IID_ICeFileFilter object,
    // return a pointer to the object.
    if (IsEqualIID (riid, IID_IUnknown) ||
        IsEqualIID (riid, IID_ICeFileFilter)){

        // Return pointer to object.
        *ppv = (ICeFileFilter *)this;
        AddRef();                // Inc ref to prevent delete on return.
        return NOERROR;
    }
    *ppv = NULL;
    return (E_NOINTERFACE);
}
//----------------------------------------------------------------------
// AddRef - Increment object ref count.
STDMETHODIMP_(ULONG) MyFileFilter::AddRef (THIS) {
    ULONG cnt;

    cnt = (ULONG)InterlockedIncrement (&m_lRef);
    return cnt;
}
//----------------------------------------------------------------------
// Release - Decrement object ref count.
STDMETHODIMP_(ULONG) MyFileFilter::Release (THIS) {
    ULONG cnt;

    cnt = (ULONG)InterlockedDecrement (&m_lRef);
    if (cnt == 0)
        delete this;
    return cnt;
}
//----------------------------------------------------------------------
// NextConvertFile - Called to convert the next file
STDMETHODIMP MyFileFilter::NextConvertFile (int nConversion,
                              CFF_CONVERTINFO *pci, CFF_SOURCEFILE *psf,
                              CFF_DESTINATIONFILE *pdf,
                              volatile BOOL *pbCancel, CF_ERROR *perr) {
    IStream *pstreamSrc;
    IStream  *pstreamDest;
    ICeFileFilterSite *pffs;
    CEOSVERSIONINFO vi;
    DWORD cBytesRemaining, cBytesRead, cCopySize;
    LARGE_INTEGER largMov;
    TCHAR szNewName[MAX_PATH];
    PBYTE pBuff;
    HRESULT hr;
    int i;

    // If first call for file, see if too large to fit in object store.
    if (nConversion == 0) {
        m_fBreakFile = FALSE;
        m_ulTotalMoved = 0;
        // If import to CE and file > 4 MB, see if too big for
        // object store.
        if ((pci->bImport) && psf->cbSize > FILESIZELIMIT) {

            vi.dwOSVersionInfoSize = sizeof (vi);
            CeGetVersionEx (&vi);
            // If version < 2.1, ask user
            // if we should break file.
            i = (vi.dwMajorVersion << 8) | vi.dwMinorVersion;
            if (i < 0x20a) {
                i = MessageBox (pci->hwndParent,
                            TEXT ("The file being copied is too \
large for the object store, would you like to break it into separate \
files?"),
                            TEXT ("Size Filter"), MB_YESNO);
                if (i == IDYES)
                    m_fBreakFile = TRUE;
                else {
                    *perr = HRESULT_TO_PFERROR (hr,ERROR_ACCESS_DENIED);
                    return E_FAIL;
                }
            }
        }
    } else if (m_fBreakFile) {

        if ((UINT)(nConversion * FILEBREAKSIZE) > psf->cbSize)
            return HRESULT_FROM_WIN32(ERROR_NO_MORE_ITEMS);
    } else
        return HRESULT_FROM_WIN32(ERROR_NO_MORE_ITEMS);

    // Allocate buffer for transfer.
    pBuff = (PBYTE)LocalAlloc (LPTR, BUFFSIZE);
    if (!pBuff) {
        *perr = HRESULT_TO_PFERROR (hr, E_OUTOFMEMORY);
        return E_FAIL;
    }
    // Get pointer to FileFilterSite interface.
    pffs = pci->pffs;

    // Open source file.
    hr = pffs->OpenSourceFile (PF_OPENFLAT, (PVOID *)&pstreamSrc);
    if (!SUCCEEDED (hr)) {
        LocalFree (pBuff);
        *perr = HRESULT_TO_PFERROR (hr, ERROR_ACCESS_DENIED);
        return E_FAIL;
    }
    // Seek to part of file for this section.
    if (m_fBreakFile) {
        largMov.HighPart = 0;
        largMov.LowPart = nConversion * FILEBREAKSIZE;
        hr = pstreamSrc->Seek (largMov, STREAM_SEEK_SET, NULL);

        // Modify destination name to mark part.  New name becomes
        // old name with a number appended for each part.
        wsprintf (szNewName, TEXT ("%s%s_%d.%s"),
                  pdf->szPath, pdf->szFilename, nConversion,
                  pdf->szExtension);

        hr = pffs->OpenDestinationFile (PF_OPENFLAT, szNewName,
                                        (PVOID *)&pstreamDest);
        if (!SUCCEEDED (hr)) {
            LocalFree (pBuff);
            pffs->CloseSourceFile (pstreamSrc);
            *perr = HRESULT_TO_PFERROR (hr, ERROR_ACCESS_DENIED);
            return E_FAIL;
        }

    } else
        // Open destination file with default name.
        hr = pffs->OpenDestinationFile (PF_OPENFLAT, NULL,
                                        (PVOID *)&pstreamDest);
    if (!SUCCEEDED (hr)) {
        LocalFree (pBuff);
        pffs->CloseSourceFile (pstreamSrc);
        *perr = HRESULT_TO_PFERROR (hr, ERROR_ACCESS_DENIED);
        return E_FAIL;
    }

    // Copy data.
    cCopySize = min (psf->cbSize - m_ulTotalMoved, FILEBREAKSIZE);
    for (cBytesRemaining = cCopySize; cBytesRemaining > 0; ) {
        // Read the data.
        i = min (BUFFSIZE, cBytesRemaining);
        hr = pstreamSrc->Read (pBuff, i, &cBytesRead);
        if (cBytesRead == 0)
            break;

        // See if user canceled the transfer.
        if (*pbCancel) {
            hr = ERROR_CANCELLED;
            break;
        }

        // Write the data and update bytes remaining.
        hr = pstreamDest->Write (pBuff, cBytesRead, NULL);
        if (!SUCCEEDED (hr))
            break;

        // Update transfer totals.
        m_ulTotalMoved += cBytesRead;
        cBytesRemaining -= cBytesRead;

        // Tell the user how far we've gotten.
        pffs->ReportProgress (m_ulTotalMoved/psf->cbSize * 100);
    }
    // Close files and clean up.
    pffs->CloseSourceFile (pstreamSrc);
    pffs->CloseDestinationFile (TRUE, pstreamDest);
    LocalFree (pBuff);

    if (hr == ERROR_CANCELLED)
        return HRESULT_FROM_WIN32 (ERROR_CANCELLED);

    if (!SUCCEEDED (hr)) {
        *perr = hr;
        return E_FAIL;
    }
    return NOERROR;
}
//----------------------------------------------------------------------
// FilterOptions - Called to indicate the file filter options
STDMETHODIMP MyFileFilter::FilterOptions (HWND hwndParent) {
    MessageBox (hwndParent, TEXT ("Filter Options Box"), TEXT ("Title"),
                MB_OK);
    return NOERROR;
}
//----------------------------------------------------------------------
// FormatMessage - Called to format error messages
//
STDMETHODIMP MyFileFilter::FormatMessage (DWORD dwFlags,
                            DWORD dwMessageId, DWORD dwLanguageId,
                            LPTSTR lpBuffer, DWORD dwSize,
                            va_list *args, DWORD *pcb) {
    DWORD cMsgLen;

    // Pass the error code on to the Win32 FormatMessage.  Force look
    // into message table of filter by ORing dwFlags with
    // FORMAT_MESSAGE_FROM_HMODULE.
    cMsgLen = ::FormatMessage (dwFlags | FORMAT_MESSAGE_FROM_HMODULE,
                               hInst, dwMessageId, dwLanguageId,
                               lpBuffer, dwSize, args);
    if (cMsgLen)
        *pcb = cMsgLen;
    else
        return E_FAIL;

    return NOERROR;
}