我试图将web中的图像返回给这样的圆球:
:
public HttpResponseMessage GetImage()
{
var memoryStream = custom logic to create image
var result = new HttpResponseMessage(HttpStatusCode.OK);
result.Content = new ByteArrayContent(memoryStream.ToArray());
result.Content.Headers.ContentType = new MediaTypeHeaderValue("image/png");
return result;
}
塞布尔:
var imageData = await Get<byte[]>(url);
var imageView = new ImageView { ImageData = imageData }
但是Get
抛出一个异常:
Exception thrown: 'Newtonsoft.Json.JsonReaderException' in Newtonsoft.Json.dll
Exception thrown: 'Newtonsoft.Json.JsonReaderException' in Newtonsoft.Json.dll
Exception thrown: 'System.Exception' in Zebble.UWP.dll
Exception thrown: 'System.Exception' in mscorlib.ni.dll
ERROR: HttpGet -> 'url' failed.
WARNING: Failed to convert API response to Byte[]
###############################################
Base issue: Unexpected character encountered while parsing value: �. Path '', line 1, position 1.
--------------------------------------
STACK TRACE:
at Zebble.Framework.BaseApi.<GetFromTheServer>d__24`1.MoveNext()
at Zebble.Framework.BaseApi.<Get>d__25`1.MoveNext()
知道怎么解决这个问题吗?
发布于 2017-04-12 10:40:20
您的WebApi必须返回字符串。可以使用Base64字符串传输图像数据。
步骤1:将Web代码更改为:
var memoryStream = new MemoryStream(); //TODO: custom logic to create image
image.Save(memoryStream, ImageFormat.Png);
return Ok(Convert.ToBase64String(memoryStream.ToArray()));
更多细节:http://zebble.net/docs/get-apis
步骤2:在Zebble代码中,使用Ze球WebAPI代理调用WebAPI来接收返回的Base64字符串,转换为byte[]并设置为ImageView的源:
var base64 = await Api.Get<string>(url);
var imageData = Convert.FromBase64String(base64);
myImageView.ImageData = imageData;
更多细节:http://zebble.net/docs/calling-a-get-api-in-the-mobile-app
https://stackoverflow.com/questions/43346625
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