Question

我试图在Unity 3D中将base64字符串转换为Sprite，但我场景中的精灵仍为空白。

public var cardPicture : Image;

function ReceiveData(jsonReply : JSONObject) {
    var pictureBytes : byte[] = System.Convert.FromBase64String(jsonReply.GetString("picture"));
    var cardPictureTexture = new Texture2D( 720, 720);
    Debug.Log(cardPictureTexture.LoadImage(pictureBytes));
    var sprite : Sprite = new Sprite ();
    sprite = Sprite.Create (cardPictureTexture, new Rect (0,0,720,720), new Vector2 (0.5f, 0.5f));
    cardPicture.overrideSprite = sprite;
}

这打印出来是真的，但我不确定它是从字节中正确加载图像还是其他东西出错了。我不确定要检查什么以确定出了什么问题。将一些图片分配给场景中的cardPicture正确显示。

我记录了jsonReply.picture并使用了一个在线base64到图像转换器，它正确地显示了图像。

Answer 1

 byte[] pictureBytes = System.Convert.FromBase64String(jsonReply.GetString("picture"));

 Texture2D tex = new Texture2D(2, 2);
 tex.LoadImage( imageBytes );

 Sprite sprite = Sprite.Create(tex, new Rect(0.0f, 0.0f, tex.width, tex.height), new Vector2(0.5f, 0.5f), 100.0f);

 cardPicture.overrideSprite = sprite;

Answer 2

我不知道这是否已解决，但我想分享我的解决方案。

void Start()
{
    StartCoroutine(GetQR());
}

IEnumerator GetQR()
{
    using (UnityWebRequest www = UnityWebRequest.Get(GetQR_URL))
    {
        yield return www.SendWebRequest();

        if (www.isNetworkError || www.isHttpError)
        {
            Debug.Log(www.error);
        }
        else
        {
            // Show results as text
            Debug.Log(www.downloadHandler.text);
            
            QRData qr = JsonUtility.FromJson<QRData>(www.downloadHandler.text);

            string result = Regex.Replace(qr.img, @"^data:image\/[a-zA-Z]+;base64,", string.Empty);

            CovertBase64ToImage(result);
        }
    }
}

void CovertBase64ToImage(string img)
{
    byte[] bytes = Convert.FromBase64String(img);
    Texture2D myTexture = new Texture2D(512,212);
    myTexture.LoadImage(bytes);
   
    Sprite sprite = Sprite.Create(myTexture, new Rect(0, 0, myTexture.width, myTexture.height), new Vector2(0.5f, 0.5f));
    QRimage.transform.parent.gameObject.SetActive(true);
    QRimage.sprite = sprite;
}

它在统一版本 2019.4 上完美运行

从来自websocket

2 个答案: