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Convert image into useable byte array in C?


Convert image into useable byte array in C?

By : user3862281
Date : November 22 2020, 07:01 PM
this one helps. The ImageMagick library can do this too, although often it provides enough image manipulation functions that you can do many things without needing to convert the image to a byte array and handle it yourself.
code :


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Metro APP - BitmapImage to Byte[] or Download Image from Web and convert it to a Byte[] Array

Metro APP - BitmapImage to Byte[] or Download Image from Web and convert it to a Byte[] Array


By : Darren
Date : March 29 2020, 07:55 AM
Hope this helps In your code you're never waiting for the BitmapImage to load the image from the web, so it does not know its PixelWidth/PixelHeight when you access them. You could wait for it to load - for example using the AsyncUI library by calling "await bi.WaitForLoadedAsync()". This would not really help you here if you want to access the decoded pixels since BitmapImage does not give you access to the pixels and there is currently no API to convert a BitmapImage into a WriteableBitmap.
You can check an earlier question about the topic. You would need to get the image file from the web with something like HttpClient.GetAsync(), then load it using something like BitmapDecoder.
How to convert image into byte array and byte array to base64 String in android?

How to convert image into byte array and byte array to base64 String in android?


By : joaowo
Date : March 29 2020, 07:55 AM
This might help you Can someone tell me the code to convert image into byte array and that byte array into base64 string. i write the below code not getting proper result . , Try this:
code :
// convert from bitmap to byte array
public byte[] getBytesFromBitmap(Bitmap bitmap) {
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    bitmap.compress(CompressFormat.JPEG, 70, stream);
    return stream.toByteArray();
}

// get the base 64 string
String imgString = Base64.encodeToString(getBytesFromBitmap(someImg), 
                       Base64.NO_WRAP);
How to pass byte array of an Image over a soap web-service(XML) and decode this byte array on android device to convert

How to pass byte array of an Image over a soap web-service(XML) and decode this byte array on android device to convert


By : user3608847
Date : March 29 2020, 07:55 AM
it should still fix some issue I want to send images over a web service to an android device. This web service is written in VB.net and it is being called by android device to fetch the data. I can fetch the data normally, but the issue is with Images. I have converted image into byte array, converted it into string and passed it over web service(XML) to android device. I cannot decode this String byte array back to an image on android side. How to achieve this? Any simple solution? Am I using wrong approach? , For Converting Image To String :
code :
String imageAsString=Base64.encodeToString(byteArray, Base64.DEFAULT);
byte[] imageAsBytes = Base64.decode(imageAsString.getBytes(), Base64.DEFAULT);

ImageView image = (ImageView)findViewById(R.id.ImageView);
Bitmap imgBitmap=BitmapFactory.decodeByteArray(imageAsBytes,0,imageAsBytes.length);
image.setImageBitmap(imgBitmap);
How to convert byte array of PDF to byte array of jpg image in Java using apache pdfbox api?

How to convert byte array of PDF to byte array of jpg image in Java using apache pdfbox api?


By : Michael Martin
Date : March 29 2020, 07:55 AM
To fix this issue I found one solution but renderer.renderImageWithDPI(pageNumber, 300) method takes page number as method argument and it can convert only one page of PDF at a time. But I need full PDf into JPG in form of byte array.
code :
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.imageio.ImageIO;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.rendering.PDFRenderer;

public class DocumentService {

    public byte[] convertPDFtoImage(byte[] bytesPDF) {
        InputStream targetStream = new ByteArrayInputStream(bytesPDF);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        PDDocument document = null;
        try {
            document = PDDocument.load(targetStream);
            PDFRenderer renderer = new PDFRenderer(document);
            int pageNumber = 1;
            BufferedImage bi = renderer.renderImageWithDPI(pageNumber, 300);
            ImageIO.write(bi, "jpg", baos);
            baos.flush();
        } catch (Exception e) {
            log.error(e.getMessage(), e);
        } finally {
            if (document != null) {
                try {
                    document.close();
                    baos.close();
                    log.info("End convert PDF to Images process");
                } catch (IOException e) {
                    log.error(e.getMessage());
                }
            }
        }
        return baos.toByteArray();
    }
}
Convert byte array (byte[]) to Image in Java

Convert byte array (byte[]) to Image in Java


By : DJChupa13
Date : March 29 2020, 07:55 AM
hop of those help? To convert an array of bytes, i.e. byte[] into an Image, use getImage(). Probably the easiest way to do this is to instantiate an ImageIcon using the ImageIcon(byte[]) constructor, and then call getImage(). This is illustrated in the method below, particularly the last line:
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