javascript – 显示从相机拍摄的图像

如下所示,我使用的是[src]属性.我要做的是预览从设备的相机拍摄的图像.请参阅下面的其他打字稿代码.

<img [src]="lastImage" style="width: 100%" [hidden]="lastImage === null">
<button ion-button icon-left (click)="presentActionSheet()">
    <ion-icon name="camera"></ion-icon>Select Image
</button>

这是.ts代码

lastImage: string = null;

public presentActionSheet() {
    let actionSheet = this.actionSheetCtrl.create({
        title: 'Select Image Source',buttons: [
            {
                text: 'Load from Library',handler: () => {
                    this.takePicture(this.camera.PictureSourceType.PHOTOLIBRARY);
                }
            },{
                text: 'Use Camera',handler: () => {
                    this.takePicture(this.camera.PictureSourceType.CAMERA);
                }
            },{
                text: 'Cancel',role: 'cancel'
            }
        ]
    });

    actionSheet.present();
}

public takePicture(sourceType) {
    // Create options for the Camera Dialog
    var options = {
        quality: 100,sourceType: sourceType,saveToPhotoAlbum: false,correctOrientation: true
    };

    // Get the data of an image
    this.camera.getPicture(options).then((imagePath) => {
        // Special handling for Android library
        if (this.platform.is('ios') && sourceType === this.camera.PictureSourceType.PHOTOLIBRARY) {
            alert('IF');
            this.filePath.resolveNativePath(imagePath).then(filePath => {
                let correctPath = filePath.substr(0,filePath.lastIndexOf('/') + 1);
                let currentName = imagePath.substring(imagePath.lastIndexOf('/') + 1,imagePath.lastIndexOf('?'));

                // alert(correctPath);
                alert(correctPath + currentName);
                this.lastImage = correctPath + currentName;
                // this.copyFileToLocalDir(correctPath,currentName,this.createFileName());
            });
        } else {
            alert('ELSE'); // This part runs
            var currentName = imagePath.substr(imagePath.lastIndexOf('/') + 1);
            var correctPath = imagePath.substr(0,imagePath.lastIndexOf('/') + 1);

            alert(cordova.file.dataDirectory + currentName); // This returns proper image path

            this.lastImage = cordova.file.dataDirectory + currentName;

            alert(this.lastImage); // this also has the image path.

            this.copyFileToLocalDir(correctPath,this.createFileName());
        }
    },(err) => {
        this.presentToast('Error while selecting image.');
    });
}

现在,当我选择图像使用相机然后它打开相机,我拍了一张照片.但不知何故,我上面的HTML中没有预览照片,我正在使用[src] =“lastImage”.我的代码有什么问题,它没有显示来自相机的任何图像？

UPDATE

我也使用了normalizeURL,我发现here如下！

import { normalizeURL } from 'ionic-angular';

this.lastImage = normalizeURL(cordova.file.dataDirectory + currentName);

这段代码会发生什么,它用http：// localhost：8080替换file：///部分,而我从摄像机拍摄的照片本地而不是任何服务器,并希望在img标签上显示.

解决方法

他,我建议使用base64将图像设置为img标签,检查下一个代码：

控制器属性

private base64Image: any = false;

在你的控制器构造函数集中：“public domSanitizer：DomSanitizer”作为参数,这允许对角度表示图像是“安全的”.

控制器方法

takePicture() {

const options: CameraOptions = {
  quality: 10,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:
  this.base64Image = 'data:image/jpeg;base64,' + imageData;

},(err) => {
  this.message("Error,your camera device not work");
});

}

在您的视图文件中

<img *ngIf="base64Image != 'false'" [src]="domSanitizer.bypassSecurityTrustUrl(base64Image)">

javascript – 显示从相机拍摄的图像

解决方法

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