在 Ionic 3 中显示 Native Camera 拍摄的 FILE_URI 图像

Question

如何在 Ionic 3 中显示用户使用 @ionic-native/camera 拍摄的 FILE_URI 图像？

我可以使用 Ionic Native 的相机获取 FILE_URI 图像 URL，结果如下：

file:///var/mobile/Containers/Data/Application/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXX/tmp/cdv_photo_005.jpg

但是，当我尝试通过引用我的视图模板中的 URI 向用户显示该图像时，该图像从未加载。

我尝试过的事情：

-在视图中直接使用图片URI

<img src="{{profile.image}}">    // Never loads

-通过在页面组件中包含 DomSanitizer 来净化 URI：

<img [src]="domSanitizer.bypassSecurityTrustUrl(profile.image)">    // Never loads

由于性能拖累，我宁愿不使用 base64 图像。我在这里做错了什么？

Answer 1

您好尝试使用文件路径离子插件

path = "file:///var/mobile/Containers/Data/Application/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXX/tmp/cdv_photo_005.jpg";
this.filePath.resolveNativePath(path)
   .then(filePath => console.log(filePath))
   .catch(err => console.log(err));

请阅读文档 https://ionicframework.com/docs/native/file-path/

Answer 2

从 'ionic-angular' 导入 { normalizeURL }；

<img *ngIf="base64Image" src="{{base64Image}}"/> 

 openCamera(pictureSourceType: any) {
  let options: CameraOptions = {
   quality: 95,
   destinationType: this.camera.DestinationType.FILE_URI,
   sourceType: pictureSourceType,
   encodingType: this.camera.EncodingType.PNG,
   targetWidth: 400,
   targetHeight: 400,
   saveToPhotoAlbum: true,
   correctOrientation: true
 };
 this.camera.getPicture(options).then(imageData => {
  if (this.platform.is('ios')) {
      this.base64Image = normalizeURL(imageData);
      // Alternatively if the problem only occurs in ios and normalizeURL 
      // doesn't work for you then you can also use:
      // this.base64Image= imageData.replace(/^file:\/\//, '');
  }
  else {
      this.base64Image= "data:image/jpeg;base64," + imageData;
  }
 }, error => {
     console.log('ERROR -> ' + JSON.stringify(error));
   });
 }

Answer 3

您可以使用下面的代码来显示图像

savePhotoClick = () =>{

const options: CameraOptions = {
  quality: 70,
  destinationType: this.camera.DestinationType.DATA_URL,
  encodingType: this.camera.EncodingType.JPEG,
  mediaType: this.camera.MediaType.PICTURE
}

this.camera.getPicture(options).then((imageData) => {
  // imageData is either a base64 encoded string or a file URI
  // If it's base64 (DATA_URL):
  this.base64Image = 'data:image/jpeg;base64,' + imageData;
}, (err) => {
  // Handle error
});

然后使用img标签进行展示

 <img [src]="base64Image" *ngIf="base64Image" />

在 Ionic 3 中显示 Native Camera 拍摄的 FILE_URI 图像

Displaying a FILE_URI image taken by Native Camera in Ionic 3

ionic-framework

ionic-native

ionic3