我有这行代码
formData.append('picture', {uri: this.state.avatarSource.uri, name: 'photo.png', type: 'image/png'});
但我想＆＃34;支持＆＃34;许多格式。我的后端代码可以自动处理格式＆＃34;＃34;并且可以确定它是否是视频：
for upload in self.get_uploads():
try:
content_type = blobstore.blobstore.BlobInfo(upload.key()).content_type
if 'video' in content_type:
现在我不需要立即支持视频，但我想以一般方式处理图像格式。它在脚本中看起来我只能支持png图像。
客户端代码的其余部分：
import React, {Component} from 'react';
import {Alert, AsyncStorage, Dimensions, Image, Picker, PixelRatio, ScrollView, TouchableOpacity, StyleSheet, Text, TextInput, View} from 'react-native';
import {Button, Input} from 'react-native-elements'
import Icon from 'react-native-vector-icons/FontAwesome';
import ImagePicker from 'react-native-image-picker';
const SCREEN_WIDTH = Dimensions.get('window').width;
options = {
title: 'Select Avatar',
customButtons: [
{name: 'fb', title: 'Choose Photo from Facebook'},
],
storageOptions: {
skipBackup: true,
path: 'images'
}
};
const formData = new FormData();
class Buttons extends Component {
constructor(props) {
super(props);
if (AsyncStorage.getItem('name')) {
name = AsyncStorage.getItem('name');
}
if (AsyncStorage.getItem('auth_id')) {
auth_id = AsyncStorage.getItem('auth_id');
}
this.state = {avatarSource: null,
videoSource: null,
name: name,
auth_id: auth_id,
upload_url: '',
country: '',
category: '',
region: '',
city: '',
title: '',
text: '',
options: {
"4699201": "Kumbakonam",
"4699202": "Madurai",
"4700196": "Chengalpattu",
"4700197": "Coonoor",
"4693193": "Tiruchirappalli",
"4700198": "Kanchipuram",
"4700199": "Pudukkottai",
"4703196": "Thoothukkudi",
"4701199": "Karur",
"4691203": "Avadi",
"4691202": "Ambattur",
"4697199": "Thanjavur",
"4697198": "Chennai",
"4691205": "Other city",
"4696196": "Salem",
"4691204": "Vellore",
"4701198": "Erode",
"4701200": "Tiruvannamalai",
"4694193": "Arakonam",
"4692202": "Hosur",
"4692203": "Pollachi",
"4702196": "Dindigul",
"4702197": "Tambaram",
"4695201": "Cuddalore",
"4695202": "Tiruppur",
"4704192": "Coimbatore",
"4702198": "Tirunelveli",
"4676202": "Namakkal",
"4676201": "Nagercoil"
}
};
}
selectPhotoTapped() {
const options = {
quality: 1.0,
maxWidth: 500,
maxHeight: 500,
storageOptions: {
skipBackup: true
}
};
ImagePicker.showImagePicker(options, (response) => {
console.log('Response = ', response);
if (response.didCancel) {
console.log('User cancelled photo picker');
}
else if (response.error) {
console.log('ImagePicker Error: ', response.error);
}
else if (response.customButton) {
console.log('User tapped custom button: ', response.customButton);
}
else {
let source = { uri: response.uri };
// You can also display the image using data:
// let source = { uri: 'data:image/jpeg;base64,' + response.data };
this.setState({
avatarSource: source
});
}
});
}
selectVideoTapped() {
const options = {
title: 'Video Picker',
takePhotoButtonTitle: 'Take Video...',
mediaType: 'video',
videoQuality: 'medium'
};
ImagePicker.showImagePicker(options, (response) => {
console.log('Response = ', response);
if (response.didCancel) {
console.log('User cancelled video picker');
}
else if (response.error) {
console.log('ImagePicker Error: ', response.error);
}
else if (response.customButton) {
console.log('User tapped custom button: ', response.customButton);
}
else {
this.setState({
videoSource: response.uri
});
}
});
}
selectCountry(val) {
this.setState({country: val});
}
setTitle(val) {
this.setState({title: val});
}
setCategory(val) {
this.setState({category: val});
}
setCity(val) {
this.setState({city: val});
}
setText(val) {
this.setState({text: val});
}
selectRegion(val) {
this.setState({region: val});
fetch('https://www.koolbusiness.com/cities/insert/api', {
method: 'POST',
headers: {
Accept: 'application/json',
'Content-Type': 'application/json',
},
body: JSON.stringify({
"region_id": val,
}),
}).then((response) => response.json())
.then((responseJson) => {
this.setCities(responseJson);
})
.catch((error) => {
console.error(error);
});
}
setCities = (value) => {
this.setState({'options': value});
};
setName = (value) => {
this.setState({'name': value});
};
onPressLearnMore = () => {
AsyncStorage.getItem("auth_id").then((value) => {
formData.append('auth_id', value);
formData.append('title', this.state.title);
formData.append('text', this.state.text);
formData.append('city', this.state.city);
formData.append('category', this.state.category);
formData.append('picture', {uri: this.state.avatarSource.uri, name: 'photo.png', type: 'image/png'});
fetch(this.state.upload_url, {
method: 'POST',
headers: {
'Content-Type': 'multipart/form-data'
},
body: formData,
}).then((response) => response.json())
.then((responseJson) => {
Alert.alert(
'Thank you ' + this.state.name,
'Your ad was posted',
[
{text: 'OK', onPress: () => console.log('OK Pressed')},
{text: 'Logout', onPress: () => AsyncStorage.clear()},
],
{cancelable: false}
);
})
.catch((error) => {
console.error(error);
Alert.alert(
'An error has occurred',
[
{text: 'OK', onPress: () => console.log('OK Pressed')},
{text: 'Logout', onPress: () => AsyncStorage.clear()},
],
{cancelable: false}
);
});
});
};
componentDidMount() {
AsyncStorage.getItem("name").then((value) => {
this.state.name = value;
});
fetch('https://www.koolbusiness.com/cities/insert/api', {
method: 'POST',
headers: {
Accept: 'application/json',
'Content-Type': 'application/json',
},
body: JSON.stringify({
"region_id": "4701188",
"password": this.state.password,
}),
}).then((response) => response.json())
.then((responseJson) => {
this.setCities(responseJson);
})
.catch((error) => {
console.error(error);
});
fetch('https://www.koolbusiness.com/api/getuploadurl', {
method: 'POST',
headers: {
Accept: 'application/json',
'Content-Type': 'application/json',
},
}).then((response) => response.json())
.then((responseJson) => {
//this.setState(upload_url=responseJson);
//let t = responseJson;
//obj = JSON.parse(responseJson);
// this.setState(upload_url, responseJson["upload_url"])
this.setState({'upload_url': responseJson.upload_url});
})
.catch((error) => {
console.error(error);
});
}
render() {
return (
<ScrollView style={styles.container}>
<View style={styles.contentView}>
<View style={styles.headerContainer}>
<Icon color="white" name="rocket" size={62}/>
<Text style={styles.heading}>Create your ad</Text>
</View>
<Text>Pick a Category</Text>
<Picker selectedValue={this.state.category}
onValueChange={(itemValue, itemIndex) => this.setCategory(itemValue)}
>
<Picker.Item label="Houses" value="1020"/>
<Picker.Item label="Apartments" value="1010"/>
<Picker.Item label="Vacation homes" value="1030"/>
<Picker.Item label="Offices" value="1050"/>
<Picker.Item label="Land" value="1080"/>
<Picker.Item label="Flatmates/Paying Guest" value="1100"/>
<Picker.Item label="Cars" value="2010"/>
<Picker.Item label="Motorcycles" value="2030"/>
<Picker.Item label="Accessories & parts" value="2040"/>
<Picker.Item label="Trucks" value="2080"/>
<Picker.Item label="Other vehicles" value="2070"/>
<Picker.Item label="Home & Personal items" value="js"/>
<Picker.Item label="Home & Garden" value="3040"/>
<Picker.Item label="Clothing" value="3050"/>
<Picker.Item label="For Kids (Toys & Clothes)" value="3030"/>
<Picker.Item label="Jewelry & Watches" value="3060"/>
<Picker.Item label="Leisure, Sports & hobby" value="js"/>
<Picker.Item label="Hobbies" value="4010"/>
<Picker.Item label="Sports & Bicycles" value="4020"/>
<Picker.Item label="Movies, Books & Magazines" value="4040"/>
<Picker.Item label="Pets" value="4030"/>
<Picker.Item label="Tickets" value="4090"/>
<Picker.Item label="Art & Collectibles" value="4060"/>
<Picker.Item label="Music & Instruments" value="4070"/>
<Picker.Item label="Computers & Accessories" value="5030"/>
<Picker.Item label="TV, Audio, Video, Cameras" value="5020"/>
<Picker.Item label="Cellphones & gadgets" value="5010"/>
<Picker.Item label="Video games & consoles" value="5040"/>
<Picker.Item label="Jobs & Services" value="js"/>
<Picker.Item label="Job offers" value="6010"/>
<Picker.Item label="Resumes" value="6020"/>
<Picker.Item label="Services" value="6030"/>
<Picker.Item label="Classes" value="6040"/>
<Picker.Item label="Professional/Office equipment" value="6090"/>
<Picker.Item label="Other" value="7010"/>
</Picker>
<Text>Pick a Region</Text>
<Picker selectedValue={this.state.region}
onValueChange={(itemValue, itemIndex) => this.selectRegion(itemValue)}
>
<Picker.Item label="Andaman & Nicobar Islands" value="4703187"/>
<Picker.Item label="Andhra Pradesh" value="4694186"/>
<Picker.Item label="Arunachal Pradesh" value="4699188"/>
<Picker.Item label="Assam" value="4692186"/>
<Picker.Item label="Bihar" value="4702186"/>
<Picker.Item label="Chandigarh" value="4698185"/>
<Picker.Item label="Chhattisgarh" value="4676188"/>
<Picker.Item label="Dadra & Nagar Haveli" value="4691190"/>
<Picker.Item label="Daman & Diu" value="4704183"/>
<Picker.Item label="Delhi" value="4699183"/>
<Picker.Item label="Goa" value="4702187"/>
<Picker.Item label="Gujarat" value="4691189"/>
<Picker.Item label="Haryana" value="4700186"/>
<Picker.Item label="Himachal Pradesh" value="4703185"/>
<Picker.Item label="Jammu & Kashmir" value="4694187"/>
<Picker.Item label="Jharkhand" value="4699189"/>
<Picker.Item label="Karnataka" value="4701185"/>
<Picker.Item label="Kerala" value="4695189"/>
<Picker.Item label="Lakshadweep" value="4700189"/>
<Picker.Item label="Madhya Pradesh" value="4697186"/>
<Picker.Item label="Maharashtra" value="4694184"/>
<Picker.Item label="Manipur" value="4700187"/>
<Picker.Item label="Meghalaya" value="4703186"/>
<Picker.Item label="Mizoram" value="4698184"/>
<Picker.Item label="Nagaland" value="4692187"/>
<Picker.Item label="Orissa" value="4696185"/>
<Picker.Item label="Pondicherry" value="4676189"/>
<Picker.Item label="Punjab" value="4693185"/>
<Picker.Item label="Rajasthan" value="4701186"/>
<Picker.Item label="Sikkim" value="4701187"/>
<Picker.Item label="Tamil Nadu" value="4701188"/>
<Picker.Item label="Telangana" value="4984687332163584"/>
<Picker.Item label="Tripura" value="4697187"/>
<Picker.Item label="Uttaranchal" value="4699190"/>
<Picker.Item label="Uttar Pradesh" value="4692188"/>
<Picker.Item label="West Bengal" value="4700188"/>
</Picker>
<Text>Pick a City</Text>
<Picker selectedValue={this.state.city}
onValueChange={(itemValue, itemIndex) => this.setCity(itemValue)}
>
{Object.keys(this.state.options).map((key) => {
return (<Picker.Item label={this.state.options[key]} value={key} key={key}/>) //if you have a bunch of keys value pair
})}
</Picker>
<Input
keyboardAppearance='light'
autoFocus={false}
autoCapitalize='none'
autoCorrect={false}
onChangeText={(title) => this.setState({title})}
value={this.state.title}
returnKeyType='next'
inputStyle={{marginLeft: 10}}
containerStyle={{borderBottomColor: 'rgba(0, 0, 0, 0.38)'}} placeholder="Subject" />
<TextInput
multiline={true}
numberOfLines = {4}
placeholder="Type your text here!"
onChangeText={(text) => this.setState({text})}
value={this.state.text}
/>
<TouchableOpacity onPress={this.selectPhotoTapped.bind(this)}>
<View style={[styles.avatar, styles.avatarContainer, {marginBottom: 20}]}>
{ this.state.avatarSource === null ? <Text>Select a Photo</Text> :
<Image style={styles.avatar} source={this.state.avatarSource} />
}
</View>
</TouchableOpacity>
<Button
onPress={this.onPressLearnMore}
title="SUBMIT"
disabled={false}
titleStyle={{fontWeight: '700'}}
buttonStyle={{
backgroundColor: 'rgba(92, 99,216, 1)',
width: 300,
height: 45,
borderColor: 'transparent',
borderWidth: 0,
borderRadius: 5
}}
containerStyle={{marginTop: 20}}
/>
</View>
</ScrollView>
);
}
}
const styles = StyleSheet.create({
container: {
backgroundColor: 'white'
},
contentView: {
flex: 1
},avatarContainer: {
borderColor: '#9B9B9B',
borderWidth: 1 / PixelRatio.get(),
justifyContent: 'center',
alignItems: 'center'
},
avatar: {
borderRadius: 75,
width: 150,
height: 150
},
headerContainer: {
justifyContent: 'center',
alignItems: 'center',
padding: 40,
backgroundColor: '#4F80E1',
marginBottom: 20
},
heading: {
color: 'white',
marginTop: 10,
fontSize: 22,
fontWeight: 'bold'
},
});
export default Buttons;
答案 0 :(得分：1)
不确定问题究竟是什么，但您可以使用文件选择器而不是react-native-image-picker，并在状态中设置File对象，并将其直接附加到formData，如下所示：
formData.append('picture', file);