如何将 Cordova 图像选择器结果转换为 Base64 格式？

Question

您好，我想知道如何将图像选择器结果转换为 Base64，通过 Cordova 相机获取图像时，我可以获得 base64 格式的数据，但在 cordova 图像选择器中它不起作用

我已经看到下面的链接并应用了它的 Working for Cordova Camera Image Capture 但不适用于 Cordova 图像选择器

http://stackoverflow.com/questions/29456897/cordova-image-picker-convert-to-base64

不适用于科尔多瓦图像选择器

 $scope.Pick=function(){
  var options = {
      quality: 50,
      destinationType: Camera.DestinationType.DATA_URL,
      sourceType: Camera.PictureSourceType.CAMERA,
      allowEdit: true,
      encodingType: Camera.EncodingType.JPEG,
      targetWidth: 100,
      targetHeight: 100,
      popoverOptions: CameraPopoverOptions,
      saveToPhotoAlbum: false,
    correctOrientation:true
    };

  $cordovaImagePicker.getPictures(options)
    .then(function (results) {
      for (var i = 0; i < results.length; i++) {
        console.log('Image URI: ' + results[i]);
      }
      $scope.results=results;
    }, function(error) {
    });

};

为 Cordova 图像捕获工作

$scope.captureimage=function()
{
 var options = {
      quality: 100,
      destinationType: Camera.DestinationType.DATA_URL,
      sourceType: Camera.PictureSourceType.CAMERA,
      allowEdit: true,
      encodingType: Camera.EncodingType.JPEG,
      targetWidth: 100,
      targetHeight: 100,
      popoverOptions: CameraPopoverOptions,
      saveToPhotoAlbum: false,
    correctOrientation:true
    };
    $cordovaCamera.getPicture(options).then(function(imageData) {

      $scope.cimage=imageData;
      alert($scope.cimage);
    }, function(err) {
    });

  }

Answer 1

pickimage 返回一个 URI 而不是图像数据。这是应该做你想做的代码：

 $scope.Pick=function(){
  var options = {
      quality: 50,
      destinationType: Camera.DestinationType.DATA_URL,
      sourceType: Camera.PictureSourceType.CAMERA,
      allowEdit: true,
      encodingType: Camera.EncodingType.JPEG,
      targetWidth: 100,
      targetHeight: 100,
      popoverOptions: CameraPopoverOptions,
      saveToPhotoAlbum: false,
    correctOrientation:true
    };

  $cordovaImagePicker.getPictures(options)
    .then(function (results) {
      for (var i = 0; i < results.length; i++) {
        console.log('Image URI: ' + results[i]);

        window.resolveLocalFileSystemURI(results[i],
            function (fileEntry) {
                // convert to Base64 string


                fileEntry.file(
                    function(file) {
                        //got file
                        var reader = new FileReader();
                        reader.onloadend = function (evt) {
                            var imgData = evt.target.result; // this is your Base64 string
                        };
                        reader.readAsDataURL(file);
                    }, 
                function (evt) { 
                    //failed to get file
                });
            },
            // error callback
            function () { }
        );
      }


      $scope.results=results;
    }, function(error) {
    });

};