> For the complete documentation index, see [llms.txt](https://developers-apps-in-toss.toss.im/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers-apps-in-toss.toss.im/documentation/api-and-sdk-zh/sdk/domains-api/wen-jian/file.openpdfviewer.md).

# File.openPDFViewer

> 函数式 API `openPDFViewer`也能用它实现相同功能。

### 功能说明

将 Base64 编码的 PDF 数据在原生 PDF 查看器中打开。用户关闭查看器时 `'CLOSE'`会返回。

Toss App Android/iOS `5.261.0` 可在以上版本中使用。调用前 `File.openPDFViewer.isSupported()`可以通过它确认是否支持。在不支持的版本中调用时 `UNSUPPORTED_APP_VERSION` 会发生错误。

### 类型

```ts
File.openPDFViewer(params: OpenPDFViewerParams): Promise<OpenPDFViewerResult>;
```

**参数**

```ts
type OpenPDFViewerParams = {
  data: string;
  filename?: string;
};
```

**响应**

```ts
type OpenPDFViewerResult = "CLOSE";
```

### 错误代码

错误代码是 catch 到的错误的 `error.code` 值。

| 代码                        | 说明                                                                                                                |
| ------------------------- | ----------------------------------------------------------------------------------------------------------------- |
| `UNSUPPORTED_APP_VERSION` | 如果当前运行的 Toss App 版本不支持此功能，则调用后会立即发生。 `File.openPDFViewer.isSupported()`请先通过它确认，发生时 `error.message`请向用户显示（更新提示文案）。 |
| `INVALID_REQUEST`         | 请求参数不正确的情况。                                                                                                       |
| `INVALID_DATA`            | 当 PDF 数据无效时。                                                                                                      |
| `PDF_VIEWER_ERROR`        | 在打开 PDF 查看器的过程中发生错误时。                                                                                             |

### 示例代码

```js
import { File } from "@apps-in-toss/web-framework";

async function handleOpenPdf() {
  if (!File.openPDFViewer.isSupported()) {
    console.log("当前 Toss App 版本无法使用 PDF 查看器。");
    return;
  }

  try {
    const result = await File.openPDFViewer({
      data: "JVBERi0xLjQK...",
      filename: "document.pdf",
    });

    if (result === "CLOSE") {
      console.log("PDF 查看器已关闭。");
    }
  } catch (error) {
    console.error("PDF 查看器错误:", error);
  }
}

document.querySelector("#open-pdf").addEventListener("click", handleOpenPdf);
```


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