如何将图像 URI 转换为字节博览会 [英] How Do I Convert Image URI into Byte Expo
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>
);
}
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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