问题

我正在尝试使用 React Native 和 Firebase 创建一个应用程序。我想要这个应用程序的功能之一是能够上传图像。不过，我在将图像上传到 firebase 存储时遇到了一些问题。我正在使用 expo 的图像选择器来查找用户想要上传的图像的路径，但是一旦有了路径，我就不知道如何将其转换为可以上传到 firebase 的内容。

有人可以帮我将图像的路径转换为我可以使用 React Native 上传到 firebase 存储的东西吗？

我尝试过的

我尝试使用:

     _pickImage = async () => {
    let result = await ImagePicker.launchImageLibraryAsync({
      MediaTypeOptions: 'Images',
      quality: 0.4,
_uploadAsByteArray = async (pickerResultAsByteArray, progressCallback) => {

    try {

      var metadata = {
        contentType: 'image/jpeg',
      };

      var storageRef = firebase.storage().ref();
      var ref = storageRef.child('images/'+expoID+'/'+this.state.time)
      let uploadTask = ref.put(pickerResultAsByteArray, metadata)

      uploadTask.on('state_changed', function (snapshot) {

        progressCallback && progressCallback(snapshot.bytesTransferred / snapshot.totalBytes)

        var progress = (snapshot.bytesTransferred / snapshot.totalBytes) * 100;
        console.log('Upload is ' + progress + '% done');

      }, function (error) {
        console.log("in _uploadAsByteArray ", error)
      }, function () {
        var downloadURL = uploadTask.snapshot.downloadURL;
        console.log("_uploadAsByteArray ", uploadTask.snapshot.downloadURL)
    this.setState({imageUploaded:true})
      });


    } catch (ee) {
      console.log("when trying to load _uploadAsByteArray ", ee)
    }
  }


  convertToByteArray = (input) => {
    var binary_string = this.atob(input);
    var len = binary_string.length;
    var bytes = new Uint8Array(len);
    for (var i = 0; i < len; i++) {
      bytes[i] = binary_string.charCodeAt(i);
    }
    return bytes
  }

  atob = (input) => {
    const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';

    let str = input.replace(/=+$/, '');
    let output = '';

    if (str.length % 4 == 1) {
      throw new Error("'atob' failed: The string to be decoded is not correctly encoded.");
    }
    for (let bc = 0, bs = 0, buffer, i = 0;
      buffer = str.charAt(i++);

      ~buffer && (bs = bc % 4 ? bs * 64 + buffer : buffer,
        bc++ % 4) ? output += String.fromCharCode(255 & bs >> (-2 * bc & 6)) : 0
    ) {
      buffer = chars.indexOf(buffer);
    }

    return output;
  }


uploadImage(bsfdata){
    this.setState({imageUploaded:false})
    this._uploadAsByteArray(this.convertToByteArray(bsfdata), (progress) => {
    this.setState({ progress:progress })
    })
  }
  base64:true,
});



 /* if (!result.cancelled) {
      this.setState({ image: result.uri });
      let formData = new FormData();
        formData.append('photo', {
           uri,
           name: `photo.${fileType}`,
           type: `image/${fileType}`,
     });}*/
      this.uploadImage(result.base64);
  };

}

我试过添加注释代码，但没有上传任何东西，我试过代码现在的样子，这给了我错误 Can currently only create a Blob from other Blob，上传进度永远不会超过0%。

最佳答案

如果您使用的是 expo (>=26)，那么您可以使用以下代码行轻松完成。

uploadImage = async(imageUri) => {
  const response = await fetch(imageUri);
  const blob = await response.blob();
  var ref =   firebase.storage().ref().child("image.jpg");
  return ref.put(blob);
}

引用:https://youtu.be/KkZckepfm2Q

关于javascript - 将图像路径转换为 ​​blob react native，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48108791/