Question

我创建了一个应用程序，可以拍照并上传到AWS s3。一旦捕获了这些，就需要对它们进行哈希处理。在那里，我使用了Base64哈希方法，并且捕获的照片被加密了。但是我无法打开它，也不确定是否以适当的方式完成了该操作。

在上传之前，我想取消这些哈希。也就是说，它们必须作为散列图像存储在图库中。但是，我想在上传之前将它们转换为原始图像。因此，我可以将真实图像存储在云中。

我的代码是

   import React, {Component} from 'react';
    import {Platform, StyleSheet,Alert, Text,TouchableOpacity, View,Picker,Animated,Easing,Image, NetInfo,
      Dimensions,Button,ScrollView } from 'react-native';
      import ImagePicker from 'react-native-image-picker';
    import RNFS from 'react-native-fs';

    class SecondScreen extends React.Component {

        takePic = () => {
           if(this.state.connection_Status==="Online"){
            this.getServerTime();
              try{
                  this.setState({capturedTime:this.state.serverTime.currentFileTime+'_'+time}, 
                    () => console.log(this.state.serverTime.currentFileTime)
                  ); 

              } catch (err) {
                  var date = new Date();
                  var time = date.getTime();
                  this.setState({capturedTime:time});
                  console.log("localtime")
                }
            }

            const options = {
              quality: 1.0,
              maxWidth: 75,
              maxHeight: 75,
              base64: true,
              skipProcessing: true
          }
            ImagePicker.launchCamera(options,(responce)=>{

                this.state.testImage.push({ uri: responce.uri });
                  const file ={
                    uri : responce.uri,
                    name :responce.fileName,
                    method: 'POST',
                    width : 50,
                    height : 50,
                    path : responce.path,
                    type :  responce.type,
                    notification: {
                        enabled: true
                      }
                  }

              this.setState(prevState => {
                // get the previous state values for the arrays
                let saveImages = prevState.saveImages;
                // add the values to the arrays like before
                saveImages.push(file);
                // return the new state
                return {
                 saveImages
                }
              });

              const base64 = RNFS.writeFile(responce.path, 'base64');
              return base64;

            })
        }

      _upload=()=>{
        if(this.state.connection_Status==="Online"){
          const config ={
              keyPrefix :aws_keyPrefix,
              bucket : aws_bucketName,
              region :aws_region,
              accessKey:aws_accessKey,
              secretKey :aws_secretKey,
              successActionStatus :201
            }
            //store captured images in an array
            this.state.saveImages.map((image) => {
                 RNS3.put(image,config)
                .then((responce) => {
                  console.log(image);
                });
            });

            if (this.state.saveImages && this.state.saveImages.length) {
              Alert.alert("Successfully, uploaded");
              //reset the arrays
              this.setState({saveImages:''});
              this.setState({testImage:''});
            } else {
              Alert.alert('No images captured');
            }
          } else {
            Alert.alert('Upload failed. User is in offline');
          }
      } 

      render() {
          return (
              <View style={styles.Camera}>
                <TouchableOpacity onPress={this.takePic.bind(this)}>
                  <Text>Take Picture</Text>
                </TouchableOpacity>

                <View style={styles.Send}>
                   <TouchableOpacity onPress={() => this._upload()}>
                      <Text>Send</Text>
                   </TouchableOpacity>
              </View>
              );
            }
          }

    const styles = StyleSheet.create({
      Camera :{
        justifyContent: 'center',
        alignItems: 'center',
        marginTop : 20,
        backgroundColor : '#48a4ff',
        alignItems : 'center',
        padding : 1,
        borderWidth : 1,
        borderColor : '#48a4ff',
      },
      Send :{
        justifyContent: 'center',
        alignItems: 'center',
        marginTop : 20,
        backgroundColor : '#48a4ff',
        alignItems : 'center',
        padding : 3,
        borderWidth : 1,
        borderColor : '#48a4ff',
      }
    });
export default SecondScreen;

我正在使用此代码对图像进行哈希处理，

const base64 = RNFS.writeFile(responce.path, 'base64');
              return base64;

散列后的图片属性如下，

如何在上传之前将其转换为真实图像？

自从我努力一天以来，谁能帮助我。我没有任何文档来实现此功能。

Answer 1

我已经使用react-native-fs库完成了此操作。我在客户端进行的图像哈希处理，即在服务器端进行的本机和哈希处理。（我将图像存储在Amezon s3中，然后使用python取消对这些图像进行哈希处理。）

我的图像哈希代码是

takePic = () => {
       /* other sets of codes
         .
         .*/

         const base64 = RNFS.writeFile(responce.uri, responce.data);
         return base64;
   }

React Native-如何在Android

1 个答案: