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Convert buffer data to an image


By : indiequick
Date : August 01 2020, 08:00 PM
hop of those help? You'll need to convert the buffer to a base64 string. Here's an example for a PNG image. I am not clear on where your image is stored and format it's in however. This example reads the image as a file. May need to adjust things based on your data source.
server.js
code :
const express = require('express')
const app = express()
const fs = require('fs')
app.set('view engine', 'ejs')

app.get('/', function(req, res) {
  const data = fs.readFileSync('./image.png')

  res.render('page', {
    image: data.toString('base64')
  })
})

const server = app.listen(2000)
<img src="data:image/png;base64,<%= image %>" />



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Convert image buffer to pdf with ImageMagick in C++


By : prasada
Date : March 29 2020, 07:55 AM
Hope this helps Assuming you're using Magick++ Magick::Image has a constructor that can create an image from an in-memory blob and a write() method that can write a PDF (and a bunch of other formats) to an in-memoy blob as well.
Note that on my Linux machine ImageMagick appears to be creating a few temporary files during operation. I'm not sure that meets your requirement but it might be configurable.
code :
#include <iostream>
#include <Magick++.h>

using namespace std;
using namespace Magick;

static char imageData[] = {
    /* ... */
};

int main(int argc, char** argv)
{
        /* Initialize the library */
        InitializeMagick(*argv);

        /* Instantiate an image from RGB data */
        Image image(4,         // Width
                    14,        // Height
                    "RGB",     // Color components ordering
                    CharPixel, // Components storage type
                    imageData);// Image data

        /* Write pdf in memory */
        Blob b;
        image.write(&b, string("pdf"));

        /* write pdf data to cout */
        /* it should be easy to send it over a socket instead */
        cout.write(static_cast<const char*>(b.data()), b.length());

        return 0;
}

How to convert char buffer (with pcm audio data) to short buffer


By : John Gieler
Date : March 29 2020, 07:55 AM
should help you out The use of atoi() with the address of the variables is entirely mistaken and incorrect. That is for converting the ASCII representation of a value into a number. In your case, you don't really have a buffer of "characters" but rather a buffer of byte values, which under the history of C is commonly implemented with the char type rather than something more recent and definitive such as int8_t.
To convert between a character buffer and a short buffer, you first need to answer the critical question if the encoding of the character buffer is in the system's native endian order, or opposite to it.

Convert Audio data in IeeeFloat buffer to PCM in buffer


By : Heather Johnstone
Date : March 29 2020, 07:55 AM
Does that help If you want to resample while you receive data, then you need to perform input driven resampling. I wrote an article on this a while ago.
NAudio has some helper classes to go from mono to stereo, and float to PCM, but they tend to operate on IWaveProvider or ISampleProvider inputs. Typically if I just had the samples as a raw block of bytes I'd write by own simple code to go from float to PCM and double up the samples. It's not that hard to do and the WaveBuffer class will allow you to read float samples directly from a byte[].

Convert raw image to buffer


By : Bhuvie
Date : March 29 2020, 07:55 AM
Does that help I ended up just using the terminal through pipe to convert it to base64:
code :
fswebcam -r 640x480 - | base64
// Take a picture in an async way and return it as a base64 encoded string
// Props: https://scottlinux.com/2012/09/01/encode-or-decode-base64-from-the-command-line/
module.exports = async ({ resolution = '640x480', rotate = 0 } = {}) => {
  const query = `fswebcam -r ${resolution} --rotate ${rotate} - | base64`;
  const out = await exec(query, { maxBuffer: 1024 * 1024 });
  return out[0];
};

Convert Pdf buffer to jpg image buffer ( NodeJS )


By : user2239587
Date : March 29 2020, 07:55 AM
like below fixes the issue Maybe this could help. Just googled pdf to image and got this.
code :
npm install pdf-image

var PDFImage = require("pdf-image").PDFImage;
var pdfImage = new PDFImage("/tmp/slide.pdf");
pdfImage.convertFile().then(function (imagePaths) {
// [ /tmp/slide-0.png, /tmp/slide-1.png ]

});
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