如何将图像 URI 转换为字节博览会-前端问题

How Do I Convert Image URI into Byte Expo(如何将图像 URI 转换为字节博览会)

本文介绍了如何将图像 URI 转换为字节博览会的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在使用 expo-image-picker 上传图片.但问题是我想通过 WebAPI 以字节的形式将图像发送到服务器.那么如何将图像 URI 转换为字节呢?如果有人有这方面的经验，请分享.

I'm uploading image using expo-image-picker. but the issue is I want to send the image to the server through WebAPI in the form of Byte. So how can I convert the image URI into Byte? if anyone have experience on it so kindly share.

 componentDidMount() {
        this.getPermissionAsync();
    }
    getPermissionAsync = async () => {
        if (Constants.platform.ios) {
            const { status } = await Permissions.askAsync(Permissions.CAMERA_ROLL);
            if (status !== 'granted') {
                alert('Sorry, we need camera roll permissions to make this work!');
            }
        }
    };
    _pickImage = async () => {
        try {
            let result = await ImagePicker.launchImageLibraryAsync({
                allowsEditing: true,
                aspect: [4, 3],
            });
            console.log(result);

            if (!result.cancelled) {
                this.setState({ image: result.uri });
            }
        } catch (e) {
            console.log(e);
        }
    };
render() {
        return (
            <View>
                <Card>
                    <CardItem>
                        <Body>
                            <Button block primary onPress={() => this._pickImage()}>
                                <Text>Add Activity</Text>
                            </Button>
                            {this.state.image && <Image source={{ uri: this.state.image }} style={{ width: 200, height: 200 }} /> }
                        </Body>
                    </CardItem>
                </Card>
            </View>
        );
    }

世博小吃

推荐答案

你可以这样做:

import { Buffer } from "buffer";

_pickImage = async () => {
  try {
    let result = await ImagePicker.launchImageLibraryAsync({
      base64: true,
      allowsEditing: true,
      aspect: [4, 3],
    });

    if (!result.cancelled) {
      let imageByte = new Buffer(result.base64, "base64");

      this.setState({ image: result.uri });
    }
  } catch (e) {
      console.log(e);
  }
};

注意:您将需要 buffer 包.

NOTE: You will need buffer package.

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