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Getting images byte[] from MS SQLServer through WCF to Ionic3 Angular4

So , that was quite a challenge.

After saving the images as byte[] pretty neat through the MVC client into the MS SqlServer , I wanted to get them into the app of Ionic3 with Angular4 ..

 

The problem was –

Well there were several problems –

  1. How to return the data through the http without loosing data in “translation” on the way ?

Solution is in C# WCF before returning it convert to base64 – it will send the data intact through the www traffic.

dto.Logo = Convert.ToBase64String(dal.Logo);

       2.   When we get the data – we need to translate it into the image again :

this post helped me –  Search for the comment with 400 upvotes!

So, in my ts client side – my Ionic3 Angular4 baby ,  I added a function translating the byte[] into a Blob.

Blob object represents a file-like object of immutable, raw data. Blobs represent data that isn’t necessarily in a JavaScript-native format. The File interface is based on Blob, inheriting blob functionality and expanding it to support files on the user’s system.

b64toBlob(b64Data, contentType, sliceSize) {
contentType = contentType || ”;
sliceSize = sliceSize || 512;

let byteCharacters = atob(b64Data);
let byteArrays = [];

for (let offset = 0; offset < byteCharacters.length; offset += sliceSize) {
let slice = byteCharacters.slice(offset, offset + sliceSize);

let byteNumbers = new Array(slice.length);
for (let i = 0; i < slice.length; i++) {
byteNumbers[i] = slice.charCodeAt(i);
}

let byteArray = new Uint8Array(byteNumbers);

byteArrays.push(byteArray);
}

let blob = new Blob(byteArrays, {type: contentType});
return blob;
}

3. Now I started getting those messages from Chrome 

unsafe:blob:http://localhost:8100/55df97ad-0b55-4724-8a4f-83861b87e60a:1 GET unsafe:blob:http://localhost:8100/55df97ad-0b55-4724-8a4f-83861b87e60a net::ERR_UNKNOWN_URL_SCHEME

 

So I’ve built a pipe as suggested here  in compbination with the DomSanitation suggested here :

So at last I have taken this solution :

import { Pipe } from ‘@angular/core’;

import { Pipe } from ‘@angular/core’;

import { DomSanitizer, SafeHtml, SafeStyle, SafeScript, SafeUrl, SafeResourceUrl } from ‘@angular/platform-browser’;
@Pipe({ name: ‘safe’})

export class SafePipe {
constructor(protected _sanitizer: DomSanitizer) {
}
public transform(value: string, type: string = ‘html’): SafeHtml | SafeStyle | SafeScript | SafeUrl | SafeResourceUrl {

switch (type) {

case ‘html’: return this._sanitizer.bypassSecurityTrustHtml(value);

case ‘style’: return this._sanitizer.bypassSecurityTrustStyle(value);

case ‘script’: return this._sanitizer.bypassSecurityTrustScript(value);

case ‘url’: return this._sanitizer.bypassSecurityTrustUrl(value);

case ‘resourceUrl’:

return this._sanitizer.bypassSecurityTrustResourceUrl(value);

default: throw new Error(`Invalid safe type specified: ${type}`);

}

}
}

 

Added it to declarations in your app.module.ts with class name SafePipe .
And added the pipe on the html template
<img [src]=”company.LogoImage | safe: ‘resourceUrl'”>
And here I am – after two days without sleep I have images from the server side in my app..
   WiseAppSettings.JPG
Now it’s just about vise-versa – trying to upload those slippery brothers  🙂
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Ionic3 – Angular4 Super starter change language

download.jpg

 

So I’ve started with Super starter for ionic angular template.

 

The problem was it was only english also it had i18n globalization multi lingual plugin

So I’ve found this and perfected it just a bit.

 

In ..\WebstormProjects\ionic3-angular4\src\pages\tutorial\tutorial.html

Added buttons getting the param of the language wanted :

<ion-header no-shadow>
  <ion-navbar>
    <ion-buttons end >
      <button ion-button (click)="translateTo('he')" color="primary">He</button>
    </ion-buttons>

    <ion-buttons end >
      <button ion-button (click)="translateTo('ru')" color="primary">Ru</button>
    </ion-buttons>

    <ion-buttons end >
      <button ion-button (click)="translateTo('he')" color="primary">He</button>
    </ion-buttons>


    <ion-buttons end *ngIf="showSkip">
      <button ion-button (click)="startApp()" color="primary">{{ 'TUTORIAL_SKIP_BUTTON' | translate}}</button>
    </ion-buttons>


  </ion-navbar>
</ion-header>

 

And in ..\WebstormProjects\ionic3-angular4\src\pages\tutorial\tutorial.ts

I’ve encapsulated the code of  initialization for reuse when the button is hit, so actually all I am doing is reinitializing the language and saying to translate provider want language to use using the parameter I’ve got from clicking the button.

constructor(public navCtrl: NavController, public menu: MenuController, public translate: TranslateService) {

  this.initTranslate();
}

initTranslate(){
  this.translate.get(["TUTORIAL_SLIDE1_TITLE",
    "TUTORIAL_SLIDE1_DESCRIPTION",
    "TUTORIAL_SLIDE2_TITLE",
    "TUTORIAL_SLIDE2_DESCRIPTION",
    "TUTORIAL_SLIDE3_TITLE",
    "TUTORIAL_SLIDE3_DESCRIPTION",
  ]).subscribe(
    (values) => {
      console.log('Loaded values', values);
      this.slides = [
        {
          title: values.TUTORIAL_SLIDE1_TITLE,
          description: values.TUTORIAL_SLIDE1_DESCRIPTION,
          image: 'assets/img/ica-slidebox-img-1.png',
        },
        {
          title: values.TUTORIAL_SLIDE2_TITLE,
          description: values.TUTORIAL_SLIDE2_DESCRIPTION,
          image: 'assets/img/ica-slidebox-img-2.png',
        },
        {
          title: values.TUTORIAL_SLIDE3_TITLE,
          description: values.TUTORIAL_SLIDE3_DESCRIPTION,
          image: 'assets/img/ica-slidebox-img-3.png',
        }
      ];
    });
}

translateTo(lang){
  this.translate.use(lang);
  this.initTranslate();
}

 

That easy. Now you are ready for the global world. 🙂

 

 

 

 

 

 


			

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