angular - 将 pdf URL 转换为 Base64

Question

在我的 Angular 应用程序中，我使用以下代码将任何文件转换为Base64字符串。

handleUpload(event) {
    const file = event.target.files[0];
    const reader = new FileReader();
    reader.readAsDataURL(file);
    reader.onload = () => {
        console.log(reader.result);
    };
}

在这里，我想即时将pdf URL转换为base64。这是我要转换 base64 的示例 URL。

https://vadimdez.github.io/ng2-pdf-viewer/assets/pdf-test.pdf

标签： angularpdfbase64

Answer 1

您可以使用HttpClient从 url 获取文件。首先你必须HttpClientModule导入app.module.ts

import { HttpClientModule } from '@angular/common/http';
imports: [...,
     'HttpClientModule',
       ...]

在您的 component.ts HttpClientfrom中导入'@angular/common/http'并在构造函数中添加实例之后。

constructor(private http: HttpClient) { }

添加方法

convertToBase64(url: string) {
    this.http.get(url, { responseType: "blob" }).subscribe(blob => {
      const reader = new FileReader();
      const binaryString = reader.readAsDataURL(blob);
      reader.onload = (event: any) => {
        //Here you can do whatever you want with the base64 String
        console.log("File in Base64: ", event.target.result);
      };

      reader.onerror = (event: any) => {
        console.log("File could not be read: " + event.target.error.code);
      };
    });
}