Mục tiêu.
Hiển thị ảnh ở giao diện người dùng bằng cách truy xuất dữ liệu nhị phân từ cơ sở dữ liệu.
Sự cố.
Hình ảnh không được phép hiển thị ở giao diện người dùng khi tôi truy xuất dữ liệu từ cơ sở dữ liệu.
Quá trình lấy dữ liệu và hiển thị ở giao diện người dùng không hoạt động. Tôi đang thiếu phần nào của mã?
Thông tin.
*"https. //img. ngăn xếp. io/dịch vụ/7374/reac-redux. png" là logo được sử dụng trong mã sql
Cảm ơn bạn
Welcome
Learn about building Web apps with ASP.NET Core.
public IActionResult Index[]
{
var datainByte = GetData["SELECT TOP [1] [ImageBits] FROM [Test].[dbo].[Test]"];
string data = Convert.ToBase64String[datainByte];
ViewBag.Data = string.Format["data:image/png;base64,{0}", data];
return View[];
}
private Byte[] GetData[string query]
{
DataTable dt = new DataTable[];
string constr = "Server=;Database=;Trusted_Connection=True;MultipleActiveResultSets=true";
Byte[] result = null;
using [SqlConnection con = new SqlConnection[constr]]
{
using [SqlCommand cmd = new SqlCommand[query]]
{
using [SqlDataAdapter sda = new SqlDataAdapter[]]
{
cmd.CommandType = CommandType.Text;
cmd.Connection = con;
con.Open[];
result = [Byte[]]cmd.ExecuteScalar[];
}
}
return result;
}
}
USE[Test]
GO
CREATE TABLE [dbo].[Test][
[ImageName] [varchar][50] NOT NULL,
[MimeType] [varchar][50] NOT NULL,
[ImageBits] [varbinary][max] NOT NULL,
]
INSERT INTO [dbo].[Test]
[
[ImageName],
[MimeType],
[ImageBits]
]
VALUES
[
'UserGroupImage',
'image/png',
CONVERT
[
varbinary[max],
'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]
];
SELECT *
FROM OPENROWSET[BULK N'C:\Test\logo.png', SINGLE_BLOB] image;
Làm cách nào để chuyển đổi hình ảnh thành nhị phân?
BW = im2bw[ I , level ] chuyển đổi hình ảnh thang độ xám I thành hình ảnh nhị phân BW , bằng cách thay thế tất cả các pixel trong hình ảnh đầu vào có độ sáng lớn hơn mức bằng giá trị 1 [ . Phạm vi này liên quan đến các mức tín hiệu có thể có đối với loại hình ảnh.
Hình ảnh có phải là dữ liệu nhị phân không?
Hình ảnh kỹ thuật số được tạo thành từ pixel. Mỗi pixel trong hình ảnh được tạo thành từ các số nhị phân . Nếu chúng ta nói rằng 1 là màu đen [hoặc bật] và 0 là màu trắng [hoặc tắt], thì một bức ảnh đen trắng đơn giản có thể được tạo bằng nhị phân.
Tệp nhị phân có thể lưu trữ hình ảnh không?
Tệp nhị phân có thể được sử dụng để lưu trữ bất kỳ dữ liệu nào ; .
Làm cách nào để chuyển đổi nhị phân thành hình ảnh trong nodejs?
từ [dữ liệu]; . from[data, 'binary'] let imgData = new Blob[binary. bộ đệm, { loại. 'application/octet-binary' }]; . tạoObjectURL[imgData];