As the proud owner of a valid .JPEG image's binary data, I am on a quest to convert this information into an actual viewable image using Python.
Seeking advice on how to successfully transform this binary code into a visually appealing .JPEG format with extjs 4.
Past attempts have failed, including the method depicted below:
data:image/jpeg;base64,+ binary data
To convert it to base64, you can use JavaScript's btoa() function.
Here is an example:
var img = document.createElement('img');
img.src = 'data:image/jpeg;base64,' + btoa('your-binary-data');
document.body.appendChild(img);
Just make sure that the binary data in your pastebin ends with 'ffd9' for it to be valid jpeg data.
Update:
If you need a simple hex to base64 converter, you can use this function:
function hexToBase64(str) {
return btoa(String.fromCharCode.apply(null, str.replace(/\r|\n/g, "").replace(/([\da-fA-F]{2}) ?/g, "0x$1 ").replace(/ +$/, "").split(" ")));
}
Then use it like this:
img.src = 'data:image/jpeg;base64,' + hexToBase64('your-binary-data');
You can see a working example with your hex data on jsfiddle
The format for data URI is structured as follows:
data:<headers>;<encoding>,<data>
To utilize this, simply concatenate your data to the "data:image/jpeg;," string like this:
var binary_data = document.body.innerText.replace(/(..)/gim,'%$1'); // transform text data into URI format
window.open('data:image/jpeg;,'+binary_data);
Using ExtJs, you have the option to
xtype: 'image'
for displaying an image.
Check out this demo that showcases how to render binary data using ExtJs.
For encoding and decoding:
atob -- > converts ascii to binary
btoa -- > converts binary to ascii
Ext.application({
name: 'Fiddle',
launch: function () {
var srcBase64 = "data:image/jpeg;base64," + btoa(atob("iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mP8H8hYDwAFegHS8+X7mgAAAABJRU5ErkJggg=="));
Ext.create("Ext.panel.Panel", {
title: "Test",
renderTo: Ext.getBody(),
height: 400,
items: [{
xtype: 'image',
width: 100,
height: 100,
src: srcBase64
}]
})
}
});
Link to the demonstration
When working with front-end JavaScript and HTML, you have the ability to directly load a binary file as an image without needing to convert it to base64:
<img src="http://example.com/images/binary-image">
The "binary-image" referenced in the code above is a binary file that can be successfully loaded as an image.
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