我正在使用jpeg_camera库从笔记本电脑上的Web应用程序获取快照,并通过提取调用将其发送到控制器。
snapshot.get_image_data
返回一个具有3个属性的对象(数据:Uint8ClampedArray,宽度,高度)。
当我执行提取调用sendPic(data)
时,总是收到400错误,因为ModelState
无效。
这意味着Byte[]
对JS中的Uint8ClampedArray
不利。
该对象的等效物是什么?
我还发现了一种返回base64的方法,可以将其在控制器内转换为Byte[]
,但我想避免这种解决方案。
JS代码:
function savePic() {
var test1 = snapshot.get_image_data((done) => {
var data = {
"Pic": done.data,
"IdActivity": idActivity,
"Instant": new Date().toISOString()
};
sendPic(data);
});
}
function sendPic(data) {
fetch(uriPicsEndPoint, {
body: JSON.stringify(data),
headers: {
"Content-Type": "application/json; charset=utf-8"
},
credentials: 'include',
method: 'POST'
});
}
API控制器:
[Authorize]
[HttpPost]
public async Task<IActionResult> SavePic([FromBody] Selfie selfie)
{
if (ModelState.IsValid)
{
try
{
var storageAccount = CloudStorageAccount.Parse(_configuration["ConnectionStrings:Storage"]);
var blobClient = storageAccount.CreateCloudBlobClient();
var camerasContainer = blobClient.GetContainerReference("selfies");
await camerasContainer.CreateIfNotExistsAsync();
var id = Guid.NewGuid();
var fileExtension = ".jpeg";
var blobName = $"{selfie.IdActivity}/{id}{fileExtension}";
var blobRef = camerasContainer.GetBlockBlobReference(blobName);
await blobRef.UploadFromByteArrayAsync(selfie.Pic, 0, selfie.Pic.Length);
string sas = blobRef.GetSharedAccessSignature(
new SharedAccessBlobPolicy()
{
Permissions = SharedAccessBlobPermissions.Read
});
var blobUri = $"{blobRef.Uri.AbsoluteUri}{sas}";
var notification = new UpdateSelfieRequest()
{
UriPic = blobUri,
IdActivity = selfie.IdActivity,
Instant = selfie.Instant
};
string serviceBusConnectionString = _configuration["ConnectionStrings:ServiceBus"];
string queueName = _configuration["ServiceBusQueueName"];
IQueueClient queueClient = new QueueClient(serviceBusConnectionString, queueName);
var messageBody = JsonConvert.SerializeObject(notification);
var message = new Message(Encoding.UTF8.GetBytes(messageBody));
await queueClient.SendAsync(message);
await queueClient.CloseAsync();
return Ok();
}
catch
{
return StatusCode(500);
}
}
else
{
return BadRequest();
}
}
和CLASS“ Selfie”:
public class Selfie
{
public Byte[] Pic { get; set; }
public int IdActivity { get; set; }
public DateTime Instant { get; set; }
}
答案 0 :(得分:0)
使用stringify时,它在JSON中变成{"0":255, "1":0, "2":0, "3":255, ...}
。
如果您将操作参数定义为JObject selfie
,则可以使用var pic = selfie["Pic"].ToObject<Dictionary<int, byte>>()
获取字节。
或者,您可以将数据作为表单值发布,并使用浏览器中的以下代码将操作定义为SavePic(Dictionary<int, byte> Pic, int IdActivity, DateTime Instant)
进行测试:
var ctx = document.createElement('canvas').getContext('2d');
ctx.fillStyle = 'red';
ctx.fillRect(5, 5, 5, 5);
$.post('SavePic', {
Pic: ctx.getImageData(5, 5, 5, 5).data,
IdActivity: 1,
Instant: new Date().toISOString()
});
但是,在发布数据之前将Uint8ClampedArray转换为常规数组会更容易。