I am using asp.net core 5 and angular 15.0 for backend and frontend respectively. when I download a saved image file by passing its Url to downloadFile action in server side, the action method sends it as a Blob to the front side. the action method is given below:
[HttpGet("downloadFile"), DisableRequestSizeLimit]
public async Task<IActionResult> DownloadFile([FromQuery] string fileUrl)
{
var filePath = Path.Combine(Directory.GetCurrentDirectory(), fileUrl);
if (!System.IO.File.Exists(filePath))
return NotFound();
var memory = new MemoryStream();
await using (var stream = new FileStream(filePath, FileMode.Open))
{
await stream.CopyToAsync(memory);
}
memory.Position = 0;
return File(memory, GetContentType(filePath), filePath);
}
//=====================================================
private string GetContentType(string path)
{
var provider = new FileExtensionContentTypeProvider();
string contentType;
if (!provider.TryGetContentType(path, out contentType))
{
contentType = "application/octet-stream";
}
return contentType;
}
}
in the frontend, The method which receives the Blob image file is as follows:
this.filesService.download(this.imgUrl).subscribe((event) => {
if (event.type === HttpEventType.UploadProgress)
{
this.progress = Math.round((100 * event.loaded) / event.total);
}
else if (event.type === HttpEventType.Response) {
this.message = 'Download success.';
this.downloadFile(event);
}
});
//============================================================
private downloadFile = (data: HttpResponse<Blob>) => {
const BlobFile= new Blob([data.body], { type: data.body.type });
// BlobFile is: size: 12343, type:"image/jpeg", [[prototype]]: Blob
const url = URL.createObjectURL(BlobFile);
//url is: "blob:http://localhost:4200/9ee358cd-a80a-4929-bd45-fe45dc32ac12"
// What code should be written here to show image in the view?
}
public download(fileUrl: string) {
return this.http.get(`${this.baseUrl}/downloadFile?fileUrl=${fileUrl}`, {
reportProgress: true,
observe: 'events',
responseType: 'blob'
});
}
Now at this point, how do I use blobFile or url in the downloadFile method for the <img>
tag so that the image is displayed in the view?
<img src="???" >
Thank you if you provide a suitable solution.