在HTML img中将图像显示为ASP.Net核心Web Api返回的base64数据
我正在使用ASP.NETCore2.1WebAPI。 我试图从API端点发送base64数据,比如数据:image/png;xxxx年6月64日 并在HTML img标记中使用它。 第一个和第二个图像渲染,但第三个和第四个图像不渲染 我的问题是:在HTML img中将图像显示为ASP.Net核心Web Api返回的base64数据,html,asp.net-core-2.0,asp.net-core-webapi,Html,Asp.net Core 2.0,Asp.net Core Webapi,我正在使用ASP.NETCore2.1WebAPI。 我试图从API端点发送base64数据,比如数据:image/png;xxxx年6月64日 并在HTML img标记中使用它。 第一个和第二个图像渲染,但第三个和第四个图像不渲染 我的问题是: 如何在不使用JavaScript/JQuery的情况下呈现第三个图像 我犯了什么错误,我的第四个图像没有渲染 我是Asp.Net核心的新手。所以,如果代码中有任何幼稚的错误,请更正 提前到达塔克斯 HTML 图像测试 1:-通过JavaScri
- 如何在不使用JavaScript/JQuery的情况下呈现第三个图像
- 我犯了什么错误,我的第四个图像没有渲染
图像测试
1:-通过JavaScript创建图像
2:-来自GetPng的图像:
3:-来自GetBase64Uri的图像:
4:-来自PngFromBase64的图像:
ASP.NETWebAPI控制器
namespace LaTex.WebApi.Controllers
{
[路由(“api/[controller]/[action]”)
[ApiController]
公共类LaTexImageController:ControllerBase
{
私有常数int_PX=20;
私有异步任务GetImgApiData(字符串tex、int-px、int-encoded)
{
if(px可以将base64数据URI直接提供到src
属性中
误读,不确定如何删除我的答案,因为与情况无关:/n你知道我是否用返回base64 Uri的API端点替换src吗?
<!DOCTYPE html>
<html lang="en-us">
<head>
<meta charset="utf-8" />
<title>Image Test</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
</head>
<body>
<p>
1:- Image Through JavaScript
<img id="sample-img" />
</p>
<script type="text/javascript">
$(function () {
var url = "https://localhost:44367/api/LatexImage/GetBase64Uri";
$.get(url, function (data) {
//console.log(data);
$("#sample-img").attr('src', data);
});
})
</script>
<p>
2:- Image from GetPng:
<img src="https://localhost:44367/api/LatexImage/GetPng" />
</p>
<p>
3:- Image from GetBase64Uri:
<img src="https://localhost:44367/api/LatexImage/GetBase64Uri" />
</p>
<p>
4:- Image from PngFromBase64:
<img src="https://localhost:44367/api/LatexImage/PngFromBase64?Base64Png=iVBORw0KGgoAAAANSUhEUgAAADoAAAASCAIAAACFJlokAAAABmJLR0QA%2FwD%2FAP%2BgvaeTAAADtElEQVRIibVWW0gqXRReHWcItCBCtNLAkkAkqCCVqKDbgwS9FNH9wUK6QRT0ENGNiCAfgsCExBeDIkGksKJEejEiEkoxNJICkygfBC%2Fg5Ew5%2F8Oc31%2F0%2FIdOzfme1t7rW9%2F%2BZs3M3juLJEmgDziOJxIJGgVTgaIoQqMchmHz8%2FOVlZU0aqaivLw8i8bu7u%2Fvs9nsuro6ugQz8YNGLZfL9Ve9Ao1239%2FfURSlSy0VsVjMYDC4XC4AAJImmEwmm81Gl1oqNjc3w%2BHw0NCQ2Wymrbu3t7e1tbW%2FTEUikd3dXa%2FX%2B0kpp9NpNBqTw%2BvraxaLJRKJbm5u6LGLYRiCIFlZWZkpkiS3t7dbW1uXl5fPz8%2FTspFIJLPk4eFBr9cnhzqdDgDcbrdCofi6XRzHk%2FHp6Wl9ff0vaYlEwuFw5OXllZSUOByOtOzq6mpmSTAYFIvFqTN7e3sLCws8Hu%2BnXZ%2FPp1ar9Xp9OBz%2BjFeSJNva2uLxODVM2xPMZrNGo7m4uAgGgwwGQ6fT4Tju8%2Fl6eno%2BI26321EUVavV1OPt7OwQBOFyuSwWCwIAHo9Ho9Gsra1tbGxYLJbOzk6K5PF40oQ4HM7ExATVAIFA4HQ6pVJp2p6wvr7OZDLHxsY6OjqUSqVcLqfUVCpVfn7%2BZxrx9PSkUCiqqqp6e3tNJlMoFHp7ewsGg11dXQgALC4uDg8PM5nMgYGBoqIiqqyvr%2B83omw2WyKRXF5eSqVSq9WabO3z8%2FPJycnx8TEAxOPx5uZmANBqtTk5OVdXVywWq6mpye%2F3b21tUfz7%2B%2Fu5uTkq7u%2FvF4lEj4%2BP2dnZNTU14XAYwzAAGB8fT66LEAQRCASo9fh8PvnvIWcwGO7u7jK7Ozo6SsUVFRVarRYA3G731NQUNWmz2bhcLoIgXq83Nzf39fWVx%2BPFYrFoNPry8jI4OAgAxcXFKysrFH9mZiYZU7Db7SKRCADOzs4KCgrSDCAoihYWFhIEgSCI0Wisrq4WCoUA0N7e%2FvHxkcb%2B8eO%2FX1MikahUKoqT3BPEYrHVagUAvV4vEAiOjo5GRkYmJyf%2F9zVlQCgUOp1OHMcPDw%2Bnp6fTsoylpSWZTGYwGDweT0NDg0Ag%2BJlgMJAMMBiM1OKDgwOCIIRCYWlpKTXD5XIxDLPb7XK5PBAINDY2cjic35izWq0tLS2pMzweLxQK2Ww2pVJZVlaWXvCd82Z2dra7u5sgiC8r%2BP3%2BP%2BJ%2F6wIpk8mi0SiCfF2Ez%2Bf%2FEf9bF0iSJBOJRNoX8lfxD9Bi173YEwzdAAAAAElFTkSuQmCC" />
</p>
</body>
</html>
namespace LaTex.WebApi.Controllers
{
[Route("api/[controller]/[action]")]
[ApiController]
public class LaTexImageController : ControllerBase
{
private const int _PX = 20;
private async Task<byte[]> GetImgApiData( string tex, int px, int encoded)
{
if (px <= 0)
{
px = _PX;
}
if (string.IsNullOrEmpty(tex) || (tex.Trim().Length == 0))
{
tex = @"x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}";
}
if (encoded == 0)
{
tex = WebUtility.UrlEncode(tex);
}
string ImgApiUrl = $"https://chart.apis.google.com/chart?cht=tx&chs={px}&chl={tex}";
using (HttpClient client = new HttpClient())
{
HttpResponseMessage response = await client.GetAsync(ImgApiUrl);
byte[] bytes = await response.Content.ReadAsByteArrayAsync();
return bytes;
}
}
[HttpGet]
public async Task<IActionResult> GetPng([FromQuery] string tex, int px, int encoded)
{
byte[] ImgApiDataBytes = await GetImgApiData(tex, px, encoded);
return File(ImgApiDataBytes, "image/png");
}
public async Task<string> GetBase64([FromQuery] string tex, int px, int encoded)
{
byte[] ImgApiDataBytes = await GetImgApiData(tex, px, encoded);
return (Convert.ToBase64String(ImgApiDataBytes));
}
[HttpGet]
//public async Task<string> GetBase64Uri([FromQuery] string tex, int px, int encoded)
public async Task<string> GetBase64Uri([FromQuery] string tex, int px, int encoded)
{
return ("data:image/png;base64," + await GetBase64(tex, px, encoded));
}
[HttpGet]
public IActionResult PngFromBase64([FromQuery] string Base64Png)
{
byte[] image = Convert.FromBase64String(Base64Png);
return File(image, "image/png");
}
}
}