PhoneGap的EN code图像的base64 [英] Phonegap encode image base64

问题描述

我想带code图像为Base64并将其发送到服务器。当我检索图像所有它显示为空白。

I'm trying to encode an image to base64 and send it to a server. When I retrieve the image all it shows is blank.

在code到EN $ C $我使用了c那么它是这样的：

The code I'm using to encode it is this:

encodeImageUri = function(imageUri) {
        var c = document.createElement('canvas');
        var ctx = c.getContext("2d");
        var img = new Image();
        img.onload = function() {
            c.width = this.width;
            c.height = this.height;
            ctx.drawImage(img, 0, 0);
        };
        img.src = imageUri;
        var dataURL = c.toDataURL("image/jpeg");

        return dataURL.slice(22, dataURL.length);
    }

来自：<一href=\"http://stackoverflow.com/questions/11188599/using-phonegap-how-to-get-base64-image-data-of-the-photo-chosen-from-photo-libr\">Using PhoneGap的，如何获得在iPhone 从照片库选择照片的base64图像数据

Taken from: Using PhoneGap, How to get base64 image data of the photo chosen from photo library in iPhone

推荐答案

我用下面的code将图像转换为Base64：

I use the following code to convert an image to Base64:

var Base64 = {
    /**
     * This implementation relies on Cordova 1.5 or above implementations.
     */
    getBase64ImageFromInput : function (input, callback) {
        var imageReader = new FileReader();
        imageReader.onloadend = function (evt) {
            if (callback)
                callback(evt.target.result);
        };
        //Start the asynchronous data read.
        imageReader.readAsDataURL(input);
    },
    formatImageSrcString : function (base64) {
        return (base64.match(/(base64)/))? base64 : "data:image/jpeg;base64," + base64;
    } 
};

下面是一个使用这个对象将图像从一个文件输入转换为Base64编码的例子：

Below is an example using this object to convert an image from a file input to base64 encoding:

var fileInput = document.createElement('input');
fileInput.type = 'file';
fileInput.onchange = function () {
    var input = this.files[0];
    if (input) {
        Base64.getBase64ImageFromInput(input, function (imageData) {
            //Process the image string. 
            console.log(imageData);
        });
    } else {
       alert("Please select an image.");
    }
};

希望这有助于。让我知道如果你有任何问题。

Hope this helps. Let me know if you have any questions.

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