react-native - React Native - 每封邮件发送照片

Question

我正在尝试通过邮件发送最近在应用程序中捕获的照片，但遇到以下错误:

(对于我正在使用此模块的邮件功能:var Mailer = require('NativeModules').RNMail;
我试图在此模块的帮助下通过邮件发送照片并收到以下错误:

index.ios.bundle:28842Exception '-[MFMailComposeInternalViewController addAttachmentData:mimeType:fileName:] attachment must not be nil.' was thrown while invoking mail on target RNMail with params (
        {
        attachment =         {
            name = Ladunek;
            path = "assets-library://asset/asset.JPG?id=3B7DBB2E-1271-4D86-A5F2-A0CEEE7CC4DE&ext=JPG";
            type = jpg;
        };
        body = "body";
        isHTML = 1;
        recipients =         (
            "placeholder@mail.com"
        );
        subject = Ladunek;
    },
    9
)

这是调用代码:

.then((data, path) => {
        console.log(data)
        console.log(data.path)
        Mailer.mail({
          subject: 'Ladunek',
          recipients: ['placeholder@mail.com'],
          body: 'body',
          isHTML: true, // iOS only, exclude if false
          attachment: {
            path: data.path,  // The absolute path of the file from which to read data.
            type: 'jpg',   // Mime Type: jpg, png, doc, ppt, html, pdf
            name: 'Ladunek',   // Optional: Custom filename for attachment
          }
        }, (error, event) => {
            if(error) {
              AlertIOS.alert('Error', 'Could not send mail. Please send a mail to support@example.com');
            }
        });
      })

路径无效吗？或者可能是别的东西。

编辑

我正在使用此模块 react-native-camera 获取文件路径
像这样:

事件:

takePicture() {
    this.camera.capture()
      .then((data, path) =>

元素:

<Camera
              ref={(cam) => {
                this.camera = cam;
              }}
              style={{
                    flex: 1,
                    justifyContent: 'flex-end',
                    alignItems: 'center',
                    height: 400,
                    width: Dimensions.get('window').width
                  }}
              aspect={Camera.constants.Aspect.fill}>
              <Text style={{
                        flex: 0,
                        backgroundColor: '#fff',
                        borderRadius: 5,
                        color: '#000',
                        padding: 10,
                        margin: 40
                      }} onPress={this.takePicture.bind(this)}>{cameraIcon}</Text>
            </Camera>

更新2

在包含 obj-c file 之后对于 uri 到路径的转换，我现在收到以下错误:

ExceptionsManager.js:76 JSON value '<null>' of type NSNull cannot be converted to NSString

我是否从以下代码中“删除”了错误的行？ :/

obj-c 文件内容:

#import "RCTBridgeModule.h"
#import <AssetsLibrary/AssetsLibrary.h>
#import <UIKit/UIKit.h>
@interface ReadImageData : NSObject <RCTBridgeModule>
@end

@implementation ReadImageData

RCT_EXPORT_MODULE();

RCT_EXPORT_METHOD(readImage:(NSString *)input callback:(RCTResponseSenderBlock)callback)
{

  // Create NSURL from uri
  NSURL *url = [[NSURL alloc] initWithString:input];

  // Create an ALAssetsLibrary instance. This provides access to the
  // videos and photos that are under the control of the Photos application.
  //ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];

  // Using the ALAssetsLibrary instance and our NSURL object open the image.
  //[library assetForURL:url resultBlock:^(ALAsset *asset) {

    // Create an ALAssetRepresentation object using our asset
    // and turn it into a bitmap using the CGImageRef opaque type.
    //CGImageRef imageRef = [asset thumbnail];

    // Create UIImageJPEGRepresentation from CGImageRef
   // NSData *imageData = UIImageJPEGRepresentation([UIImage imageWithCGImage:imageRef], 0.1);

    // Convert to base64 encoded string
    // NSString *base64Encoded = [imageData base64EncodedStringWithOptions:0];

    callback(@[url]);

  //} failureBlock:^(NSError *error) {
    //NSLog(@"that didn't work %@", error);
  //}];



}
@end

Answer 1

------ 编辑答案如下 ------
好的，所以我终于有了一台 Mac，并且能够更详细地研究这个问题。

这是我为 Android 和 iOS 找到的。

假设您正在使用 react-native-camera连同 react-native-mail

- 1:绝对路径

添加房产 captureTarget={Camera.constants.CaptureTarget.disk}至Camera像这样的组件:

<Camera
  captureTarget={Camera.constants.CaptureTarget.disk}
  ref={(cam) => {
    this.camera = cam;
  }}
  style={styles.preview}
  aspect={Camera.constants.Aspect.fill}>
  <Text style={styles.capture} onPress={this.takePicture.bind(this)}>[CAPTURE]</Text>
</Camera>

现在相机组件应该返回 绝对 文件路径而不是 uri。

所以对于 安卓您应该会看到类似这样的内容:“ file:///storage/emulated/0/Pictures/RCTCameraModule/IMG_20160730_060652.jpg ”而不是:“ content://media/external/images/媒体/86 "和 iOS 你应该得到这样的东西:“ /Users/anton/Library/Developer/CoreSimulator/Devices/9A15F203-9A58-41C5-A4FC-EA25FAAE92BD/data/Containers/Data/Application/79FF93F9-BA89-4F4C-8809- 277BEECD447D/Documents/EFFF0ECE-4063-4FE5-984E-E76506788350.jpg “而不是:” assets-library://asset/asset.JPG?id=0058FA4A-268F-408A-9150-017A3DA368D2 JPG "

- 2:陷阱

iOS :

如果 Apple 的 MFMailComposeViewController 崩溃并且您看到以下错误消息:



这很可能是因为您在 上运行应用程序。 iOS 9 模拟器。解决方案:要么在真机上测试应用，要么下载旧版模拟器，例如 iOS 8.4。有关此问题的更多信息，请访问 here

安卓 :

在撰写本文时，还没有对 Android 的附件支持。

解决方案:(已经做PR添加这个功能，但是如果你等不及了)

将以下代码添加到文件 RNMAILModule.java

if (options.hasKey("attachment") && !options.isNull("attachment")) {
  i.putExtra(Intent.EXTRA_STREAM, Uri.parse(options.getMap("attachment").getString("path")));
}

当 Android 和 iOS 都工作时，你应该有这样的东西:




这是工作代码:

var Mailer = require('NativeModules').RNMail;
import Camera from 'react-native-camera';

import React, {Component} from 'react';
import
{
  View,
  TouchableHighlight,
  Text,
  StyleSheet,
  Dimensions,
  CameraRoll
}
from 'react-native';

const styles = StyleSheet.create({
  container: {
    flex: 1
  },
  preview: {
    flex: 1,
    justifyContent: 'flex-end',
    alignItems: 'center',
    height: Dimensions.get('window').height,
    width: Dimensions.get('window').width
  },
  capture: {
    flex: 0,
    backgroundColor: '#fff',
    borderRadius: 5,
    color: '#000',
    padding: 10,
    margin: 40
  }
});

class SendPhoto extends Component {
  takePicture() {
    this.camera.capture()
      .then((data) => {
        console.log(data.path)
        Mailer.mail({
          subject: 'Ladunek',
          recipients: ['placeholder@mail.com'],
          body: 'body',
          isHTML: true, // iOS only, exclude if false
          attachment: {
            path: data.path,  // The absolute path of the file from which to read data.
            type: 'jpg',   // Mime Type: jpg, png, doc, ppt, html, pdf
            name: 'Ladunek',   // Optional: Custom filename for attachment
          }
        }, (error, event) => {
            if(error) {
              AlertIOS.alert('Error', 'Could not send mail. Please send a mail to support@example.com');
            }
        })
      })
      .catch(err => console.error(err));
  }

  render() {
    return(
      <View>
        <View style={styles.container}>
          <Camera
            captureTarget={Camera.constants.CaptureTarget.disk}
            ref={(cam) => {
              this.camera = cam;
            }}
            style={styles.preview}
            aspect={Camera.constants.Aspect.fill}>
            <Text style={styles.capture} onPress={this.takePicture.bind(this)}>[CAPTURE]</Text>
          </Camera>
        </View>
      </View>
    );
  }
}
export default SendPhoto;

------ 下面是旧答案 ------
我以前从未使用过此模块，但看起来它需要文件的绝对路径，但是您提供的是文件 uri。

你是如何获得这个文件uri的？

尝试使用 react-native-get-real-path 模块看看它是否有帮助，你可以在这里找到它: react-native-get-real-path

即转换您的文件 uri 以获得真实路径，并将其用作 路径