logo
Tags down

shadow

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 %>" />



Share : facebook icon twitter icon

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 ]

});
Related Posts Related Posts :
  • Why doesn't the .remove() method also affect the variable it's being set on?
  • React hooks error: Rendered more hooks than during the previous render
  • How to create a completely new Keyword in JavaScript?
  • When summing values from 2 arrays how can I cap the value in the new array?
  • A pop up window to login in
  • How to push spacebar action to array
  • How do i highlight a specific table row depending on the url
  • Truly Weak Reference Event Emitter / Dispatcher: is it possible?
  • Conditionally render a a background image based on current view using React Router
  • Can not retrieve component template while routing
  • How to keep the checkbox status after refreshing the page
  • Array of Object - divide information as per values in it
  • Calculating body style height (for horizontal scroll) in javascript not working
  • How to exclude certain values from randomly generated array
  • Change colour of selected <li>
  • Formatting date object in an Array with moment is giving an unexpected result
  • combineLatest operator alternative
  • 'object' is never reassigned. Use 'const' instead
  • What does the spread operator in ES6 convert to in older JavaScript? Is it costlier than array.concat?
  • Get duplicates in array of strings and count number of duplicates
  • How to fix React Redux and React Hook useEffect has a missing dependency: 'dispatch'
  • Call a ajax request only if there are ajax requests added to the list
  • Using the jQuery each function to count divs with the same class
  • FInding out the Harshad number
  • angular route is not working and not changing current view
  • Callback executed before function finishes execution
  • How to create subfolder and document on Firestore web?
  • Scroll algorithm -- improving fetch and display of data
  • New To Programming World
  • Using mongorestore to insert many documents into a temp collection
  • How to extend localStorage across devices (without DB)
  • How to do pre increment without using ++I?
  • Retrieve filterViewId from batchUpdate request addFilterView
  • What is the corresponding instanceof target for text nodes?
  • How to Test the API by Token on Postman?
  • How to set Bootstrap dropdown menu on hover?
  • In Slate.js editor.apply(operation) is not applying "split_node" operations correctly
  • No data in GET response
  • Javascript using if else to determine array value
  • Error when I run npm install Error: 404 Not Found: 7zip-bin@~4.1.0
  • I want to modified my JSON output using JS
  • Error in Entry module not found and in webpack
  • Submit button is not submitting the form after changing the button type
  • Why is the function created is not working.?
  • How can I do day timer with javascript?
  • Tap screen to trigger autofocus with getUserMedia
  • Unable to bind html table data to mvc controller Model
  • How can I simply work around a missing JS property in an object in an object?
  • How to add anything at a specific position in a string using vanilla javascript
  • using async methods inside of array.map() in javascript
  • Math.random() vs random() in Khan Academy Computer Programming
  • Call two functions with onPress in react native
  • Use a global variable inside promise javascript
  • Turn array of objects into array of properties
  • Would having a Pure Class concept make sense or not?
  • Why catch invoked with success promise?
  • Match whole word if it meets a condition
  • Inserting items into array with bracket syntax doesnt affect length?
  • adding value inside an input - React
  • How does setInterval() run independently of sequential execution?
  • shadow
    Privacy Policy - Terms - Contact Us © voile276.org