// This function enumerates items recursively starting from the root item and calls DownloadItem() on those items
// after checking their item types.
// DownloadItem() will only be called on file items. Folder items are recursively enumerated.
HRESULT EnumerateAndDownloadItems( IWiaItem2 *pWiaItem2 )
{
// Validate arguments
if (NULL == pWiaItem2)
{
HRESULT hr = E_INVALIDARG;
ReportError(TEXT("Invalid argument passed to EnumerateAndDownloadItems()"),hr);
return hr;
}
// Get the item type for this item
LONG lItemType = 0;
HRESULT hr = pWiaItem2->GetItemType( &lItemType );
// Print the item name.
PrintItemName( pWiaItem2 );
//Find the item category
GUID itemCategory = GUID_NULL;
ReadPropertyGuid(pWiaItem2,WIA_IPA_ITEM_CATEGORY,&itemCategory );
// If this is an transferrable file(except finished files) , download it.
// We have deliberately left finished files for simplicity
if ( (lItemType & WiaItemTypeFile) && (lItemType & WiaItemTypeTransfer) && (itemCategory != WIA_CATEGORY_FINISHED_FILE) )
{
hr = DownloadItem( pWiaItem2 );
}
// If it is a folder, enumerate its children
if (lItemType & WiaItemTypeFolder)
{
// Get the child item enumerator for this item
IEnumWiaItem2 *pEnumWiaItem2 = NULL;
hr = pWiaItem2->EnumChildItems(0, &pEnumWiaItem2 );
if (SUCCEEDED(hr))
{
// We will loop until we get an error or pEnumWiaItem->Next returns
// S_FALSE to signal the end of the list.
while (S_OK == hr )
{
// Get the next child item
IWiaItem2 *pChildWiaItem2 = NULL;
hr = pEnumWiaItem2->Next( 1, &pChildWiaItem2, NULL );
// pEnumWiaItem->Next will return S_FALSE when the list is
// exhausted, so check for S_OK before using the returned
// value.
if (S_OK == hr)
{
// Recurse into this item
EnumerateAndDownloadItems( pChildWiaItem2 );
// Release this item
pChildWiaItem2->Release();
pChildWiaItem2 = NULL;
}
else if (FAILED(hr))
{
// Report that an error occurred during enumeration
ReportError( TEXT("Error calling pEnumWiaItem2->Next"), hr );
}
}
// If the result of the enumeration is S_FALSE, since this
// is normal, we will change it to S_OK
if (S_FALSE == hr)
{
hr = S_OK;
}
// Release the enumerator
pEnumWiaItem2->Release();
pEnumWiaItem2 = NULL;
}
else
{
ReportError(TEXT("pWiaItem2->EnumChildItems() failed"),hr);
}
}
return hr;
}
HRESULT
WiaGetImage(
HWND hWndParent,
LONG lDeviceType,
LONG lFlags,
LONG lIntent,
IWiaDevMgr *pSuppliedWiaDevMgr,
IWiaItem *pSuppliedItemRoot,
PFNPROGRESSCALLBACK pfnProgressCallback,
PVOID pProgressCallbackParam,
GUID *pguidFormat,
LONG *plCount,
IStream ***pppStream
)
{
HRESULT hr;
// Validate and initialize output parameters
if (plCount == NULL)
{
return E_POINTER;
}
if (pppStream == NULL)
{
return E_POINTER;
}
*plCount = 0;
*pppStream = NULL;
// Initialize the local root item variable with the supplied value.
// If no value is supplied, display the device selection common dialog.
CComPtr<IWiaItem> pItemRoot = pSuppliedItemRoot;
if (pItemRoot == NULL)
{
// Initialize the device manager pointer with the supplied value
// If no value is supplied, connect to the local device manager
CComPtr<IWiaDevMgr> pWiaDevMgr = pSuppliedWiaDevMgr;
if (pWiaDevMgr == NULL)
{
hr = pWiaDevMgr.CoCreateInstance(CLSID_WiaDevMgr);
if (FAILED(hr))
{
return hr;
}
}
// Display the device selection common dialog
hr = pWiaDevMgr->SelectDeviceDlg(
hWndParent,
lDeviceType,
lFlags,
0,
&pItemRoot
);
if (FAILED(hr) || hr == S_FALSE)
{
return hr;
}
}
// Display the image selection common dialog
CComPtrArray<IWiaItem> ppIWiaItem;
hr = pItemRoot->DeviceDlg(
hWndParent,
lFlags,
lIntent,
&ppIWiaItem.Count(),
&ppIWiaItem
);
if (FAILED(hr) || hr == S_FALSE)
{
return hr;
}
// For ADF scanners, the common dialog explicitly sets the page count to one.
// So in order to transfer multiple images, set the page count to ALL_PAGES
// if the WIA_DEVICE_DIALOG_SINGLE_IMAGE flag is not specified,
if (!(lFlags & WIA_DEVICE_DIALOG_SINGLE_IMAGE))
{
// Get the property storage interface pointer for the root item
CComQIPtr<IWiaPropertyStorage> pWiaRootPropertyStorage(pItemRoot);
if (pWiaRootPropertyStorage == NULL)
{
return E_NOINTERFACE;
}
// Determine if the selected device is a scanner or not
PROPSPEC specDevType;
specDevType.ulKind = PRSPEC_PROPID;
specDevType.propid = WIA_DIP_DEV_TYPE;
LONG nDevType;
hr = ReadPropertyLong(
pWiaRootPropertyStorage,
&specDevType,
&nDevType
);
if (SUCCEEDED(hr) && (GET_STIDEVICE_TYPE(nDevType) == StiDeviceTypeScanner))
{
// Determine if the document feeder is selected or not
PROPSPEC specDocumentHandlingSelect;
specDocumentHandlingSelect.ulKind = PRSPEC_PROPID;
specDocumentHandlingSelect.propid = WIA_DPS_DOCUMENT_HANDLING_SELECT;
LONG nDocumentHandlingSelect;
hr = ReadPropertyLong(
pWiaRootPropertyStorage,
&specDocumentHandlingSelect,
&nDocumentHandlingSelect
);
if (SUCCEEDED(hr) && (nDocumentHandlingSelect & FEEDER))
{
PROPSPEC specPages;
specPages.ulKind = PRSPEC_PROPID;
specPages.propid = WIA_DPS_PAGES;
PROPVARIANT varPages;
varPages.vt = VT_I4;
varPages.lVal = ALL_PAGES;
pWiaRootPropertyStorage->WriteMultiple(
1,
&specPages,
&varPages,
WIA_DPS_FIRST
);
PropVariantClear(&varPages);
}
}
}
// If a status callback function is not supplied, use the default.
// The default displays a simple dialog with a progress bar and cancel button.
CComPtr<CProgressDlg> pProgressDlg;
if (pfnProgressCallback == NULL)
{
pfnProgressCallback = DefaultProgressCallback;
pProgressDlg = new CProgressDlg(hWndParent);
pProgressCallbackParam = (CProgressDlg *) pProgressDlg;
}
// Create the data callback interface
CComPtr<CDataCallback> pDataCallback = new CDataCallback(
pfnProgressCallback,
pProgressCallbackParam,
plCount,
pppStream
);
if (pDataCallback == NULL)
{
return E_OUTOFMEMORY;
}
// Start the transfer of the selected items
for (int i = 0; i < ppIWiaItem.Count(); ++i)
{
// Get the interface pointers
CComQIPtr<IWiaPropertyStorage> pWiaPropertyStorage(ppIWiaItem[i]);
if (pWiaPropertyStorage == NULL)
{
return E_NOINTERFACE;
}
CComQIPtr<IWiaDataTransfer> pIWiaDataTransfer(ppIWiaItem[i]);
if (pIWiaDataTransfer == NULL)
{
return E_NOINTERFACE;
}
// Set the transfer type
PROPSPEC specTymed;
specTymed.ulKind = PRSPEC_PROPID;
specTymed.propid = WIA_IPA_TYMED;
PROPVARIANT varTymed;
varTymed.vt = VT_I4;
varTymed.lVal = TYMED_CALLBACK;
hr = pWiaPropertyStorage->WriteMultiple(
1,
&specTymed,
&varTymed,
WIA_IPA_FIRST
);
PropVariantClear(&varTymed);
if (FAILED(hr))
{
return hr;
}
// If there is no transfer format specified, use the device default
GUID guidFormat = GUID_NULL;
if (pguidFormat == NULL)
{
pguidFormat = &guidFormat;
}
if (*pguidFormat == GUID_NULL)
{
PROPSPEC specPreferredFormat;
specPreferredFormat.ulKind = PRSPEC_PROPID;
specPreferredFormat.propid = WIA_IPA_PREFERRED_FORMAT;
hr = ReadPropertyGuid(
pWiaPropertyStorage,
&specPreferredFormat,
pguidFormat
);
if (FAILED(hr))
{
return hr;
}
}
// Set the transfer format
PROPSPEC specFormat;
specFormat.ulKind = PRSPEC_PROPID;
specFormat.propid = WIA_IPA_FORMAT;
PROPVARIANT varFormat;
varFormat.vt = VT_CLSID;
varFormat.puuid = (CLSID *) CoTaskMemAlloc(sizeof(CLSID));
if (varFormat.puuid == NULL)
{
return E_OUTOFMEMORY;
}
*varFormat.puuid = *pguidFormat;
hr = pWiaPropertyStorage->WriteMultiple(
1,
&specFormat,
&varFormat,
WIA_IPA_FIRST
);
PropVariantClear(&varFormat);
if (FAILED(hr))
{
return hr;
}
// Read the transfer buffer size from the device, default to 64K
PROPSPEC specBufferSize;
specBufferSize.ulKind = PRSPEC_PROPID;
specBufferSize.propid = WIA_IPA_BUFFER_SIZE;
LONG nBufferSize;
hr = ReadPropertyLong(
pWiaPropertyStorage,
&specBufferSize,
&nBufferSize
);
if (FAILED(hr))
{
nBufferSize = 64 * 1024;
}
// Choose double buffered transfer for better performance
WIA_DATA_TRANSFER_INFO WiaDataTransferInfo = { 0 };
WiaDataTransferInfo.ulSize = sizeof(WIA_DATA_TRANSFER_INFO);
WiaDataTransferInfo.ulBufferSize = 2 * nBufferSize;
WiaDataTransferInfo.bDoubleBuffer = TRUE;
// Start the transfer
hr = pIWiaDataTransfer->idtGetBandedData(
&WiaDataTransferInfo,
pDataCallback
);
if (FAILED(hr) || hr == S_FALSE)
{
return hr;
}
}
return S_OK;
}
// This function downloads item after setting the format for the item and initializing callback (depending on category,itemtype)
// with the directory to download images to as well as the filename for the downloaded image.
HRESULT DownloadItem(IWiaItem2* pWiaItem2)
{
if( (!pWiaItem2) )
{
HRESULT hr = E_INVALIDARG;
ReportError(TEXT("Invalid argument passed to DownloadItem()"),hr);
return hr;
}
// Get the IWiaTransfer interface
IWiaTransfer *pWiaTransfer = NULL;
HRESULT hr = pWiaItem2->QueryInterface( IID_IWiaTransfer, (void**)&pWiaTransfer );
if (SUCCEEDED(hr))
{
// Create our callback class
CWiaTransferCallback *pWiaClassCallback = new CWiaTransferCallback;
if (pWiaClassCallback)
{
// Get the IWiaTransferCallback interface from our callback class.
IWiaTransferCallback *pWiaTransferCallback = NULL;
hr = pWiaClassCallback->QueryInterface( IID_IWiaTransferCallback, (void**)&pWiaTransferCallback );
if (SUCCEEDED(hr))
{
//Set the format for the item to BMP
IWiaPropertyStorage* pWiaPropertyStorage = NULL;
HRESULT hr = pWiaItem2->QueryInterface( IID_IWiaPropertyStorage, (void**)&pWiaPropertyStorage );
if(SUCCEEDED(hr))
{
hr = WritePropertyGuid(pWiaPropertyStorage,WIA_IPA_FORMAT,WiaImgFmt_BMP);
if(FAILED(hr))
{
ReportError(TEXT("WritePropertyGuid() failed in DownloadItem().Format couldn't be set to BMP"),hr);
}
//Get the file extension and initialize callback with this extension and directory in which to transfer image
//along with feeder flag.
//This will result in m_szFileName member callback class being set on which GetNextStream() will create and return a stream
BSTR bstrFileExtension = NULL;
ReadPropertyBSTR(pWiaPropertyStorage,WIA_IPA_FILENAME_EXTENSION, &bstrFileExtension);
//Get the temporary folder path which is the directory where we will download the images
TCHAR bufferTempPath[MAX_TEMP_PATH];
GetTempPath(MAX_TEMP_PATH , bufferTempPath);
// Find out item type
GUID itemCategory = GUID_NULL;
ReadPropertyGuid(pWiaItem2,WIA_IPA_ITEM_CATEGORY,&itemCategory );
BOOL bFeederTransfer = FALSE;
if(IsEqualGUID(itemCategory,WIA_CATEGORY_FEEDER))
{
//Set WIA_IPS_PAGES to ALL_PAGES will enable transfer of all pages in the document feeder (multi-page transfer).
//If somebody wants to scan a specific number of pages say N, he should set WIA_IPS_PAGES to N.
WritePropertyLong(pWiaPropertyStorage,WIA_IPS_PAGES,ALL_PAGES);
bFeederTransfer = TRUE;
}
//Initialize the callback class with the directory, file extension and feeder flag
pWiaClassCallback->InitializeCallback(bufferTempPath,bstrFileExtension,bFeederTransfer);
//Now download file item
hr = pWiaTransfer->Download(0,pWiaTransferCallback);
if(S_OK == hr)
{
_tprintf(TEXT("\npWiaTransfer->Download() on file item SUCCEEDED"));
}
else if(S_FALSE == hr)
{
ReportError(TEXT("pWiaTransfer->Download() on file item returned S_FALSE. File may be empty"),hr);
}
else if(FAILED(hr))
{
ReportError(TEXT("pWiaTransfer->Download() on file item failed"),hr);
}
//Release pWiaPropertyStorage interface
pWiaPropertyStorage->Release();
pWiaPropertyStorage = NULL;
}
else
{
ReportError(TEXT("QueryInterface failed on IID_IWiaPropertyStorage"),hr);
}
// Release the callback interface
pWiaTransferCallback->Release();
pWiaTransferCallback = NULL;
}
else
{
ReportError( TEXT("pWiaClassCallback->QueryInterface failed on IID_IWiaTransferCallback"), hr );
}
// Release our callback. It should now delete itself.
pWiaClassCallback->Release();
pWiaClassCallback = NULL;
}
else
{
ReportError( TEXT("Unable to create CWiaTransferCallback class instance") );
}
// Release the IWiaTransfer
pWiaTransfer->Release();
pWiaTransfer = NULL;
}
else
{
ReportError( TEXT("pIWiaItem2->QueryInterface failed on IID_IWiaTransfer"), hr );
}
return hr;
}
HRESULT WIACamera::DigitalCameraCapture(IWiaItem* pIWiaRoot, IplImage** ppIplImage)
{
HRESULT hr = S_OK;
IWiaItem* pIWiaItem = NULL;
hr = pIWiaRoot->DeviceCommand( 0, &WIA_CMD_TAKE_PICTURE, &pIWiaItem );
if (pIWiaItem==NULL) {
cvReleaseImage(ppIplImage);
(*ppIplImage) = NULL;
return hr;
}
IStream **ppStream = NULL;
LONG lCount = 0;
// Create the data callback interface
CDataCallback *pDataCallback = new CDataCallback( &lCount,&ppStream );
if (pDataCallback == NULL) {
return E_OUTOFMEMORY;
}
{
// Get the interface pointers
IWiaPropertyStorage *pWiaPropertyStorage;
hr = pIWiaItem->QueryInterface(IID_IWiaPropertyStorage,(void**)&pWiaPropertyStorage);
if (hr != S_OK) {
return E_NOINTERFACE;
}
IWiaDataTransfer *pIWiaDataTransfer;
hr = pIWiaItem->QueryInterface(IID_IWiaDataTransfer, (void**)&pIWiaDataTransfer);
if (hr != S_OK) {
return E_NOINTERFACE;
}
// Set the transfer type
PROPSPEC specTymed;
specTymed.ulKind = PRSPEC_PROPID;
specTymed.propid = WIA_IPA_TYMED;
PROPVARIANT varTymed;
varTymed.vt = VT_I4;
varTymed.lVal = TYMED_CALLBACK;
hr = pWiaPropertyStorage->WriteMultiple(1, &specTymed, &varTymed, WIA_IPA_FIRST );
PropVariantClear(&varTymed);
if (FAILED(hr)) {
return hr;
}
// If there is no transfer format specified, use the device default
GUID guidFormat = GUID_NULL;
GUID *pguidFormat = &guidFormat;
PROPSPEC specPreferredFormat;
specPreferredFormat.ulKind = PRSPEC_PROPID;
specPreferredFormat.propid = WIA_IPA_PREFERRED_FORMAT;
hr = ReadPropertyGuid( pWiaPropertyStorage, &specPreferredFormat, pguidFormat );
if (FAILED(hr)) {
return hr;
}
// Set the transfer format
PROPSPEC specFormat;
PROPVARIANT varFormat;
specFormat.ulKind = PRSPEC_PROPID;
specFormat.propid = WIA_IPA_FORMAT;
varFormat.vt = VT_CLSID;
varFormat.puuid = (CLSID *) CoTaskMemAlloc(sizeof(CLSID));
if (varFormat.puuid == NULL) {
return E_OUTOFMEMORY;
}
*varFormat.puuid = *pguidFormat;
hr = pWiaPropertyStorage->WriteMultiple( 1, &specFormat, &varFormat, WIA_IPA_FIRST );
PropVariantClear(&varFormat);
if (FAILED(hr)) {
return hr;
}
// Read the transfer buffer size from the device, default to 64K
PROPSPEC specBufferSize;
specBufferSize.ulKind = PRSPEC_PROPID;
specBufferSize.propid = WIA_IPA_BUFFER_SIZE;
LONG nBufferSize;
hr = ReadPropertyLong( pWiaPropertyStorage, &specBufferSize, &nBufferSize );
if (FAILED(hr)) {
nBufferSize = 64 * 1024;
}
// Choose double buffered transfer for better performance
WIA_DATA_TRANSFER_INFO WiaDataTransferInfo = { 0 };
WiaDataTransferInfo.ulSize = sizeof(WIA_DATA_TRANSFER_INFO);
WiaDataTransferInfo.ulBufferSize = 2 * nBufferSize;
WiaDataTransferInfo.bDoubleBuffer = TRUE;
// Start the transfer
hr = pIWiaDataTransfer->idtGetBandedData( &WiaDataTransferInfo, pDataCallback );
if (pWiaPropertyStorage) {
pWiaPropertyStorage->Release();
pWiaPropertyStorage = NULL;
}
if (pIWiaDataTransfer) {
pIWiaDataTransfer->Release();
pIWiaDataTransfer = NULL;
}
}
if (pIWiaItem) {
// Delete file from DigitalCamera storage
pIWiaItem->DeleteItem(0);
pIWiaItem->Release();
pIWiaItem = NULL;
}
if (lCount!=1) throw "Error.\n";
if ( SUCCEEDED(hr) ) {
Gdiplus::Bitmap myBmp(ppStream[0]);
int Width = myBmp.GetWidth();
int Height = myBmp.GetHeight();
Gdiplus::Rect rect(0, 0, Width, Height);
Gdiplus::BitmapData myBitmapData;
Gdiplus::Status res =
myBmp.LockBits(
&rect, Gdiplus::ImageLockModeRead,
PixelFormat24bppRGB, &myBitmapData
);
if ( (*ppIplImage)==NULL ) {
(*ppIplImage) = cvCreateImage(cvSize(Width,Height),IPL_DEPTH_8U,3);
} else {
CvSize oldSize = cvGetSize((*ppIplImage));
if ( oldSize.width!=Width || oldSize.height!=Height ) {
throw "Warning.\n";
cvReleaseImage(&(*ppIplImage));
(*ppIplImage) = cvCreateImage(cvSize(Width,Height),IPL_DEPTH_8U,3);
}
}
unsigned char *pIplData = (unsigned char*)(*ppIplImage)->imageData;
for ( int h=0; h < Height; h++) {
unsigned char *pIplLine = &pIplData[(*ppIplImage)->widthStep*h];
unsigned char *pBitmapLine = &((unsigned char*)myBitmapData.Scan0)[myBitmapData.Stride*h];
memcpy( pIplLine, pBitmapLine, sizeof(unsigned char)*Width*3 );
/*
for ( int w=0; w < Width; w++) {
pIplLine[w*3+0] = pBitmapLine[w*3+2];
pIplLine[w*3+1] = pBitmapLine[w*3+1];
pIplLine[w*3+2] = pBitmapLine[w*3+0];
}
*/
}
} else {
delete (*ppIplImage);
(*ppIplImage) = NULL;
}
ppStream[0]->Release();
return hr;
}