I am using ASP.Net Core 2.1 Web API. I am trying to send base64 data from API endpoint like data:image/png;base64,xxxx and using it in HTML img tag. 1st and 2nd images render but 3rd and 4th don't.
My questions are:
- How can I render the 3rd image without using JavaScript/JQuery?
- What mistake am I making that my 4th image doesn't render?
I am new to Asp.Net Core. So if there is any childish mistake in code please correct.
Thaks in advance.
HTML
<!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>
ASP.Net Web API Controller
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");
}
}
}
