Get the string invalid Base64 of image of toDataURL() for the first time in 10 of blackberry webworks

Hello

I need to get the Contact image converted to string Base64 using BB 10 Webworks (blackberry.pim.contacts) I get only the contact.photos [0] .smallFilePath which returns the path to the phonebook file.

Now, I want to get the image of this path and convert it to a Base64 string.

Here's the javascript code :

var img = document.createElement ('Image');
var canvas = document.createElement ('Canvas');

function getBase64Image (p) {}
img.setAttribute ("src", p);

Img.width = Canvas.Width;

Canvas.height = img.height;

CTX var = canvas.getContext ("2d");
ctx.drawImage (img, 0, 0);
Return canvas.toDataURL("image/jpg");

}

This means bad Base64 string of image for the first time. When I convert this string to the image it displays white screen. But returns a string in the Mithraeum and after conversion, display a correct image.

I use Blackberry Z10 (OS 10) for the test.

I think that the canvas is not drawing image properly for the first time.

I have searched and tried many things, but not got success. What will be the solution.

Thanks in advance.

My guess is that the image did not load the source completely still. Setting the src / image loading is an asynchronous event, which means that your code will continue to the next line regardless of whether the image has loaded yet or not.

After calling setAttribute instead of execute the code of the Web, you will probably need define an event on img for the load event listener. Once the image is loaded, you can then use the img with canvas variable to retrieve its data.

Note that getBase64 will return immediately, so you may need to develop some sort of mechanism to wait before returning, or the asynchronous approach and integrate reminders for the success trigger the next piece of code.

Tags: BlackBerry Developers

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