I am currently working on passing image as Base64 to a rest service. But I am not able to read the file. Here is my code:
if (requestCode == iPictureCode && resultCode == RESULT_OK) {
String picturePath = data.getStringExtra(Intents.EXTRA_PICTURE_FILE_PATH);
String image = processPictureWhenReady(picturePath);
}
`private String processPictureWhenReady(final String picturePath) {
final File pictureFile = new File(picturePath);
if (pictureFile.exists()) {
// The picture is ready; process it.
Bitmap bitmap = BitmapFactory.decodeFile(pictureFile.getAbsolutePath());
bitmap = CameraUtils.resizeImageToHalf(bitmap);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 85, stream);
String base64Image = Base64.encodeToString(stream.toByteArray(), Base64.DEFAULT);
return base64Image;
}
}`
it never enters the if block for 'pictureFile.exists()'
What could be the problem?
It looks like you adapted your code from the example in the developer docs, but you removed the else clause where a FileObserver is used to detect when the image is actually available. You need that part as well because the full-sized image may not be ready immediately when the activity returns.
Related
The aspose.barcode reader is unable to read the barcode of type DecodeType.Code128
Workflow Steps
1>Using Aspose.Barcode we have created a barcode using DecodeType.Code128 and put on PDF page ( our clients use this page as separator sheet)
2>Our client then insert this barcode page between several physical documents and scanned them all, which creates big single PDF
3>Our splitting process then, loop through all pages and check if any page is barcode page, and splits the big PDF into individual small PDF
Issue is some times the scanned quality of the barcode is not that great, and in such case ASPOSE.Barcode unable to read the barcode.
I have attached couple of barcode PDF with low scanned quality, and aspose is not able to read these barcodes. I have tried different combinations of RecognitionMode and ManualHints options without any luck
Below is my code to identity barcode page
using (var fs = new FileStream(file, FileMode.Open))
{
var pdfDocument = new Document(fs);
foreach (Page page in pdfDocument.Pages)
{
var isSeparator = splitter.IsSeparator(page);
Assert.IsTrue(isSeparator);
}
}
public bool IsSeparator(Page page)
{
if (page.Resources.Images != null && page.Resources.Images.Count >= 1)
{
var img = page.Resources.Images[1];
using (MemoryStream barcodeImage = new MemoryStream())
{
img.Save(barcodeImage, ImageFormat.Jpeg);
barcodeImage.Seek(0L, SeekOrigin.Begin);
using (BarCodeReader barcodeReader = new BarCodeReader(barcodeImage, _barcodeDecodeType))
{
barcodeReader.RecognitionMode = RecognitionMode.MaxQuality;
while (barcodeReader.Read())
{
var barcodeText = barcodeReader.GetCodeText();
if (barcodeText.ToLower() == "eof")
{
return true;
}
}
}
}
}
return false;
}
Unable to reproduce the issue at my end. I used the following sample code snippet to recognize the barcode along with latest version of the API. It is always recommended to use the latest version of the API as it contains new features and improvements.
CODE:
Aspose.Pdf.License licensePdf = new Aspose.Pdf.License();
licensePdf.SetLicense(#"Aspose.Total.lic");
// bind the pdf document
Aspose.Pdf.Facades.PdfExtractor pdfExtractor = new Aspose.Pdf.Facades.PdfExtractor();
pdfExtractor.BindPdf(#"173483_2.pdf");
// extract the images
pdfExtractor.ExtractImage();
// save images to stream in a loop
while (pdfExtractor.HasNextImage())
{
// save image to stream
System.IO.MemoryStream imageStream = new System.IO.MemoryStream();
pdfExtractor.GetNextImage(imageStream);
imageStream.Position = 0;
Aspose.BarCode.BarCodeRecognition.BarCodeReader barcodeReader =
new Aspose.BarCode.BarCodeRecognition.BarCodeReader(imageStream);
while (barcodeReader.Read())
{
Console.WriteLine("Codetext found: " + barcodeReader.GetCodeText() + ", Symbology: " + barcodeReader.GetCodeType().ToString());
}
// close the reader
barcodeReader.Close();
}
Further to update you that the same query has been post on Aspose.BarCode support forum. You may please visit the link for details.
I work as developer evangelist at Aspose.
I created a DLL that takes a Word template, I have code that edits the document using openXML then the result is sent via memory stream to a web service where the documents is downloaded to the user. The issue is that the memory stream is sending is either the original template document without the updates OR sends the updated Word document XML format where the document is obviously corrupted. Here is the code:
string strTemplate = AppDomain.CurrentDomain.BaseDirectory + "Report Template.docx";
WordprocessingDocument wdDocument;
//stream the template
byte[] fileBytes = File.ReadAllBytes(strTemplate);
MemoryStream memstreamDocument = new MemoryStream();
memstreamDocument.Write(fileBytes, 0, (int)fileBytes.Length);
wdDocument = WordprocessingDocument.Open(memstreamDocument, true);
//CODE TO UPDATE TEMPLATE
//Save entire document
wdDocument.MainDocumentPart.Document.Save();
After saving the document, if using the following code the memory stream returns the original template without any updates to the document:
return memstreamDocument;
If using the following code the memory stream returns the openXML data with the updates but the document is corrupted:
MemoryStream memstreamUpdatedDocument = new MemoryStream();
Stream streamDocument = wdDocument.MainDocumentPart.GetStream();
streamDocument.CopyTo(memstreamUpdatedDocument);
return memstreamUpdatedDocument;
Here is my code in the web service which works fine:
HttpResponse response = HttpContext.Current.Response;
MemoryStream stream = GR.GetReport("", intReportID, Culture, ConnectionString, false);
response.Clear();
response.ClearHeaders();
response.ClearContent();
response.AddHeader("content-disposition", "attachment; filename=\"" + "Report_" + intReportID+ ".docx\"");
response.ContentType = "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
response.ContentEncoding = Encoding.GetEncoding("ISO-8859-1");
stream.Position = 0;
stream.CopyTo(response.OutputStream);
response.End();
return response;
After reviewing the supplied code I have provided a modified code snippet that should fit your needs of returning a modified MemoryStream from a file template using the WordprocessingDocument class by OpenXML. Your web service code snippet provided should work as is.
// file path of template
string strTemplate = AppDomain.CurrentDomain.BaseDirectory + "Report Template.docx";
// create FileStream to read from template
FileStream fsTemplate = new FileStream(strTemplate, FileMode.Open, FileAccess.Read);
// create MemoryStream to copy template into and modify as needed
MemoryStream msDocument = new MemoryStream();
// copy template FileStream into document MemoryStream
fsTemplate.CopyTo(msDocument);
// close the template FileStream as it is no longer necessary
fsTemplate.Close();
// reset cursor position of document MemoryStream back to top
// before modifying
msDocument.Position = 0;
// create WordProcessingDocument using the document MemoryStream
using (WordprocessingDocument wdDocument = WordprocessingDocument.Open(msDocument, true)) {
//Access the main Workbook part, which contains all references.
MainDocumentPart mainPart = wdDocument.MainDocumentPart;
/* ... CODE TO UPDATE TEMPLATE ... */
// save modification to main document part
wdDocument.MainDocumentPart.Document.Save();
// close wdDocument as it is no longer needed
wdDocument.Close();
}
// reset cursor position of document MemoryStream back to top
msDocument.Position = 0;
// return memory stream as promised
return msDocument;
I want to use the DCMTK 3.6.1 library in an existing project that can create DICOM image. I want to use this library because I want to make the compression of the DICOM images. In a new solution (Visual Studio 2013/C++) Following the example in the DCMTK official documentation, I have this code, that works properly.
using namespace std;
int main()
{
DJEncoderRegistration::registerCodecs();
DcmFileFormat fileformat;
/**** MONO FILE ******/
if (fileformat.loadFile("Files/test.dcm").good())
{
DcmDataset *dataset = fileformat.getDataset();
DcmItem *metaInfo = fileformat.getMetaInfo();
DJ_RPLossless params; // codec parameters, we use the defaults
// this causes the lossless JPEG version of the dataset
//to be created EXS_JPEGProcess14SV1
dataset->chooseRepresentation(EXS_JPEGProcess14SV1, ¶ms);
// check if everything went well
if (dataset->canWriteXfer(EXS_JPEGProcess14SV1))
{
// force the meta-header UIDs to be re-generated when storing the file
// since the UIDs in the data set may have changed
delete metaInfo->remove(DCM_MediaStorageSOPClassUID);
delete metaInfo->remove(DCM_MediaStorageSOPInstanceUID);
metaInfo->putAndInsertString(DCM_ImplementationVersionName, "New Implementation Version Name");
//delete metaInfo->remove(DCM_ImplementationVersionName);
//dataset->remove(DCM_ImplementationVersionName);
// store in lossless JPEG format
fileformat.saveFile("Files/carrellata_esami_compresso.dcm", EXS_JPEGProcess14SV1);
}
}
DJEncoderRegistration::cleanup();
return 0;
}
Now I want to use the same code in an existing C++ application where
if (infoDicom.arrayImgDicom.GetSize() != 0) //Things of existing previous code
{
//I have added here the registration
DJEncoderRegistration::registerCodecs(); // register JPEG codecs
DcmFileFormat fileformat;
DcmDataset *dataset = fileformat.getDataset();
DJ_RPLossless params;
dataset->putAndInsertUint16(DCM_Rows, infoDicom.rows);
dataset->putAndInsertUint16(DCM_Columns, infoDicom.columns,);
dataset->putAndInsertUint16(DCM_BitsStored, infoDicom.m_bitstor);
dataset->putAndInsertUint16(DCM_HighBit, infoDicom.highbit);
dataset->putAndInsertUint16(DCM_PixelRepresentation, infoDicom.pixelrapresentation);
dataset->putAndInsertUint16(DCM_RescaleIntercept, infoDicom.rescaleintercept);
dataset->putAndInsertString(DCM_PhotometricInterpretation,"MONOCHROME2");
dataset->putAndInsertString(DCM_PixelSpacing, "0.086\\0.086");
dataset->putAndInsertString(DCM_ImagerPixelSpacing, "0.096\\0.096");
BYTE* pData = new BYTE[sizeBuffer];
LPBYTE pSorg;
for (int nf=0; nf<iNumberFrames; nf++)
{
//this contains all the PixelData and I put it into the dataset
pSorg = (BYTE*)infoDicom.arrayImgDicom.GetAt(nf);
dataset->putAndInsertUint8Array(DCM_PixelData, pSorg, sizeBuffer);
dataset->chooseRepresentation(EXS_JPEGProcess14SV1, ¶ms);
//and I put it in my data set
//but this IF return false so che canWriteXfer fails...
if (dataset->canWriteXfer(EXS_JPEGProcess14SV1))
{
dataset->remove(DCM_MediaStorageSOPClassUID);
dataset->remove(DCM_MediaStorageSOPInstanceUID);
}
//the saveFile fails too, and the error is "Pixel
//rappresentation non found" but I have set the Pixel rep with
//dataset->putAndInsertUint16(DCM_PixelRepresentation, infoDicom.pixelrapresentation);
OFCondition status = fileformat.saveFile("test1.dcm", EXS_JPEGProcess14SV1);
DJEncoderRegistration::cleanup();
if (status.bad())
{
int error = 0; //only for test
}
thefile.Write(pSorg, sizeBuffer); //previous code
}
Actually I made test with image that have on one frame, so the for cycle is done only one time. I don't understand why if I choose dataset->chooseRepresentation(EXS_LittleEndianImplicit, ¶ms); or dataset->chooseRepresentation(EXS_LittleEndianEXplicit, ¶ms); works perfectly but not when I choose dataset->chooseRepresentation(EXS_JPEGProcess14SV1, ¶ms);
If I use the same image in the first application, I can compress the image without problems...
EDIT: I think the main problem to solve is the status = dataset->chooseRepresentation(EXS_JPEGProcess14SV1, &rp_lossless) that return "Tag not found". How can I know wich tag is missed?
EDIT2: As suggest in the DCMTK forum I have added the tag about the Bits Allocated and now works for few images, but non for all. For some images I have again "Tag not found": how can I know wich one of tags is missing? As a rule it's better insert all the tags?
I solve the problem adding the tags DCM_BitsAllocated and DCM_PlanarConfiguration. This are the tags that are missed. I hope that is useful for someone.
At least you should call the function chooseRepresentation, after you have applied the data.
**dataset->putAndInsertUint8Array(DCM_PixelData, pSorg, sizeBuffer);**
dataset->chooseRepresentation(EXS_JPEGProcess14SV1, ¶ms);
I am trying to implement a screenshot functionality in a WinRT app that shows Video via a MediaElement. I have the following code, it saves a screenshot that's the size of the MediaElement but the image is empty (completely black). Tried with various types of Media files. If I do a Win Key + Vol Down on Surface RT, the screen shot includes the Media frame content, but if I use the following code, it's blackness all around :(
private async Task SaveCurrentFrame()
{
RenderTargetBitmap renderTargetBitmap = new RenderTargetBitmap();
await renderTargetBitmap.RenderAsync(Player);
var pixelBuffer = await renderTargetBitmap.GetPixelsAsync();
MultimediaItem currentItem = (MultimediaItem)this.DefaultViewModel["Group"];
StorageFolder currentFolder = Windows.Storage.ApplicationData.Current.LocalFolder;
var saveFile = await currentFolder.CreateFileAsync(currentItem.UniqueId + ".png", CreationCollisionOption.ReplaceExisting);
if (saveFile == null)
return;
// Encode the image to the selected file on disk
using (var fileStream = await saveFile.OpenAsync(FileAccessMode.ReadWrite))
{
var encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.PngEncoderId, fileStream);
encoder.SetPixelData(
BitmapPixelFormat.Bgra8,
BitmapAlphaMode.Ignore,
(uint)renderTargetBitmap.PixelWidth,
(uint)renderTargetBitmap.PixelHeight,
DisplayInformation.GetForCurrentView().LogicalDpi,
DisplayInformation.GetForCurrentView().LogicalDpi,
pixelBuffer.ToArray());
await encoder.FlushAsync();
}
}
Here MultimediaItem is my View Model class that among other things has a UniqueId property that's a string.
'Player' is the name of the Media Element.
Is there anything wrong with the code or this approach is wrong and I've to get in the trenches with C++?
P.S. I am interested in the WinRT API only.
Update 1 Looks like RenderTargetBitmap doesn't support this, the MSDN documentation clarifies it http://msdn.microsoft.com/en-us/library/windows/apps/windows.ui.xaml.media.imaging.rendertargetbitmap .
I'll appreciate any pointers on how to do it using DirectX C++. This is a major task for me so I'll crack this one way or the other and report back with the solution.
Yes, it is possible - little bit tricky, but working well.
You dont use mediaElement, but StorageFile itself.
You need to create writableBitmap with help of Windows.Media.Editing namespace.
Works in UWP (Windows 10)
This is complete example with file picking and getting video resolution and saving image to Picture Library
TimeSpan timeOfFrame = new TimeSpan(0, 0, 1);//one sec
//pick mp4 file
var picker = new Windows.Storage.Pickers.FileOpenPicker();
picker.SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.VideosLibrary;
picker.FileTypeFilter.Add(".mp4");
StorageFile pickedFile = await picker.PickSingleFileAsync();
if (pickedFile == null)
{
return;
}
///
//Get video resolution
List<string> encodingPropertiesToRetrieve = new List<string>();
encodingPropertiesToRetrieve.Add("System.Video.FrameHeight");
encodingPropertiesToRetrieve.Add("System.Video.FrameWidth");
IDictionary<string, object> encodingProperties = await pickedFile.Properties.RetrievePropertiesAsync(encodingPropertiesToRetrieve);
uint frameHeight = (uint)encodingProperties["System.Video.FrameHeight"];
uint frameWidth = (uint)encodingProperties["System.Video.FrameWidth"];
///
//Use Windows.Media.Editing to get ImageStream
var clip = await MediaClip.CreateFromFileAsync(pickedFile);
var composition = new MediaComposition();
composition.Clips.Add(clip);
var imageStream = await composition.GetThumbnailAsync(timeOfFrame, (int)frameWidth, (int)frameHeight, VideoFramePrecision.NearestFrame);
///
//generate bitmap
var writableBitmap = new WriteableBitmap((int)frameWidth, (int)frameHeight);
writableBitmap.SetSource(imageStream);
//generate some random name for file in PicturesLibrary
var saveAsTarget = await KnownFolders.PicturesLibrary.CreateFileAsync("IMG" + Guid.NewGuid().ToString().Substring(0, 4) + ".jpg");
//get stream from bitmap
Stream stream = writableBitmap.PixelBuffer.AsStream();
byte[] pixels = new byte[(uint)stream.Length];
await stream.ReadAsync(pixels, 0, pixels.Length);
using (var writeStream = await saveAsTarget.OpenAsync(FileAccessMode.ReadWrite))
{
var encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.JpegEncoderId, writeStream);
encoder.SetPixelData(
BitmapPixelFormat.Bgra8,
BitmapAlphaMode.Premultiplied,
(uint)writableBitmap.PixelWidth,
(uint)writableBitmap.PixelHeight,
96,
96,
pixels);
await encoder.FlushAsync();
using (var outputStream = writeStream.GetOutputStreamAt(0))
{
await outputStream.FlushAsync();
}
}
Yeah...I spent lot of hours by this
Ok I have managed to get making snapshot from MediaElement on button press to work.
I am passing MediaStreamSource object to MediaElement using SetMediaStreamSource method. MediaStreamSource has event SampleRequested which is fired basicly everytime new frame is drawn. Then using boolean I control when to create bitmap
private async void MediaStream_SampleRequested(MediaStreamSource sender, MediaStreamSourceSampleRequestedEventArgs args)
{
if (!takeSnapshot)
{
return;
}
takeSnapshot = false;
Task.Run(() => DecodeAndSaveVideoFrame(args.Request.Sample));
}
After that what is left is to decode compressed image and convert it to WriteableBitmap. The image is (or at least was in my case) in YUV fromat. You can get the byte array using
byte[] yvuArray = sample.Buffer.ToArray();
and then get data from this array and convert it to RGB. Unfortunetly I cannot post entire code but I'm gonna give you a few more hints:
YUV to RGB wiki here you have wiki describing how does YUV to RGB conversion works.
Here I found python project which solution I have adapted (and works perfectly). To be more precise you have to analize how method NV12Converter works.
The last thing is to change takeSnapshot boolean to true after pressing button or doing other activity :).
I need specifically to load a JPG image that was saved as a blob. GDI+ makes it very easy to retrieve images from files but not from databases...
Take a look at Image::Image(IStream *, BOOL). This takes a pointer to a COM object implementing the IStream interface. You can get one of these by allocating some global memory with GlobalAlloc and then calling CreateStreamOnHGlobal on the returned handle. It'll look something like this:
shared_ptr<Image> CreateImage(BYTE *blob, size_t blobSize)
{
HGLOBAL hMem = ::GlobalAlloc(GMEM_MOVEABLE,blobSize);
BYTE *pImage = (BYTE*)::GlobalLock(hMem);
for (size_t iBlob = 0; iBlob < blobSize; ++iBlob)
pImage[iBlob] = blob[iBlob];
::GlobalUnlock(hMem);
CComPtr<IStream> spStream;
HRESULT hr = ::CreateStreamOnHGlobal(hMem,TRUE,&spStream);
shared_ptr<Image> image = new Image(spStream);
return image;
}
But with error checking and such (omitted here to make things clearer)
First fetch your blog into a byte array then use something like this:
public static Image CreateImage(byte[] pict)
{
System.Drawing.Image img = null;
using (System.IO.MemoryStream stream = new System.IO.MemoryStream(pict)) {
img = System.Drawing.Image.FromStream(stream);
}
return img;
}