在 Hololens (Unity) 中打开 PDF

Question

下午好！

我试图在 UWP Hololens 应用程序中打开位于已知文件夹中的 pdf，但没有结果... 有谁知道如何进行？我设法打开它并使用以下方法检索了它的页码：

StorageFolder storageFolder = KnownFolders.CameraRoll;
StorageFile sampleFile = await storageFolder.GetFileAsync("prova.pdf");
PdfDocument pdfDocument = await PdfDocument.LoadFromFileAsync(sampleFile);
test.text = pdfDocument.PageCount.ToString();

然后我使用以下方法添加了页面选择：

using (PdfPage firstPage = pdfDocument.GetPage(0))
{
    InMemoryRandomAccessStream stream = new InMemoryRandomAccessStream();
    await firstPage.RenderToStreamAsync(stream);
    //Missing something here...
}

但是正如我的评论所述，我不知道如何将我创建的流转换为实际纹理以应用于某些东西...... 任何建议将不胜感激:)

编辑：我设法让它发挥作用，对于每一个试图获得相同结果的可怜人来说，这就是我的代码！

public async void LoadAsync()
{
    StorageFolder storageFolder = KnownFolders.CameraRoll;
    StorageFile sampleFile = await storageFolder.GetFileAsync("test.pdf");
    //pdfDocument is an instanced object of type PdfDocument
    pdfDocument = await PdfDocument.LoadFromFileAsync(sampleFile);
}

public async void ChangePageAsync()
{
    //pg is the page to load
    using (PdfPage firstPage = pdfDocument.GetPage((uint)pg)) 
    {
        InMemoryRandomAccessStream stream = new InMemoryRandomAccessStream();
        await firstPage.RenderToStreamAsync(stream);
    
        MemoryStream tempStream = new MemoryStream();
        await stream.AsStream().CopyToAsync(tempStream);
           
        byte[] imgBytes = new byte[16 * 1024];
        imgBytes = tempStream.ToArray();

        Texture2D imgTex = new Texture2D(2048, 2048, TextureFormat.BC7, false);
        imgTex.LoadImage(imgBytes);
        imgTex.filterMode = FilterMode.Bilinear;
        imgTex.wrapMode = TextureWrapMode.Clamp;

        MeshRenderer meshRenderer = PDFPlane.GetComponent<MeshRenderer>();
        Material mat = meshRenderer.material;
        mat.SetTexture("_MainTex", imgTex);
        mat.mainTextureScale = new Vector2(1, 1);
    }
}

非常感谢@AlexAR

Answer 1

基本上，您可以将流转换为字节数组并将这些字节加载到纹理中。然后，您可以轻松地将此纹理设置为四边形 material 以显示 pdf 页面的图像。这是我在项目中所做的一个例子：

using (PdfPage firstPage = pdfDocument.GetPage(0))
{
    InMemoryRandomAccessStream stream = new InMemoryRandomAccessStream();
    await firstPage.RenderToStreamAsync(stream);
    
    MemoryStream tempStream = (MemoryStream)stream.AsStream();
    
    //initialize an empty byte array
    byte[] imgBytes = new byte[16 * 1024];
    imgBytes = tempStream.ToArray();

    //best parameters I found to get a good quality
    Texture2D imgTex = new Texture2D(2048, 2048, TextureFormat.BC7, false);
    imgTex.LoadImage(imgBytes);
    imgTex.filterMode = FilterMode.Bilinear;
    imgTex.wrapMode = TextureWrapMode.Clamp;

    MeshRenderer meshRenderer = YourGameObject.GetComponent<MeshRenderer>();
    Material mat = meshRenderer.material;
    mat.SetTexture("_MainTex", imgTex);
    mat.mainTextureScale = new Vector2(1, 1);
}

在 Hololens (Unity) 中打开 PDF

Open PDF in Hololens (Unity)

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