Develop Reference

file saved path on Azure

I'm new to .NET Core and Azure I have created an API with SQL-Server and I used Dapper for saving the path to the database for POST form-data with an image, like this:
private async Task<string> WriteFile(Image image)
{
String fileName;
IFormFile file = image.image;
long Id = image.ShopId;
try
{
var extension = "." + file.FileName.Split('.')[file.FileName.Split('.').Length - 1];
fileName = Guid.NewGuid().ToString() + extension;
var path = Path.Combine(Directory.GetCurrentDirectory(), "wwwroot\\cccc", fileName);
using (var bits = new FileStream(path, FileMode.Create))
{
await file.CopyToAsync(bits);
}
Image imageupload = new Image(path,Id);
toDb(imageupload);
}
catch (Exception e)
{
return e.Message;
}
return fileName;
}
public void toDb(Image imageUpload)
{
string path = imageUpload.path;
long ShopId = unchecked((int)imageUpload.ShopId);
using (IDbConnection dbConnection = Connection)
{
string sQuery = "UPDATE shop SET path = #path WHERE ShopId = #ShopId ;";
dbConnection.Open();
dbConnection.Execute(sQuery, new {path = path,ShopId = ShopId});
}
}
Before I deployed to Azure it returned image path "F:\\xxxx\\yyyyy\\zzzzzz\\aaaaaa\\wwwroot\\bbbbbb\\5d665cbc-679d-4926-862b-4e10f9358e8a.png"
After i deployed it return my image path
D:\\home\\site\\wwwroot\\wwwroot\\Shops\\a81c757e-df7e-4cf6-b778-20fc5fcf922d.png
can i view image by using this path if it possible how it view;
If the error is my path that file tried to save to how can I fix it? If I changed saved path to wwwroot\\bbbbbb\\5d665cbc-679d-4926-862b-4e10f9358e8a.png can I viewed file it from client app if its also not possible. How can i fixed this?

can i view image by using this path if it possible how it view.
Yes, in the Azure WebApp D:\home is shared for us. We could get more information about Azure WebApp Sandbox from this tutorial.
We could use the Kudu(To access your KUDU console, using your DEPLOYMENT credentials, navigate to https://*****.scm.azurewebsites.net where ***** is the name of your Web App.) to view, upload or download the files.
We also could use the FTP tool to download or upload the files to Azure WebApp site.
can I viewed file it from client app if its also not possible. How can i fixed this?
I recommand that you could store the image information to Azure storge. It is easy for us to access from client side. For more information about how to use Azure Storage, please refer to this document.

C# Download File from a network drive

I have a file that is located at a network drive. The user access is already created to have full access to the path. But it seems that when I ran the following code to get the file, the browser just does not respond.
FileInfo file = new FileInfo(GetDocumentUploadFolder(ID) + fileName);
// Checking if file exists
if (file.Exists)
{
// Clear the content of the response
this.Page.Response.ClearContent();
// Clear the header of the response
this.Page.Response.ClearHeaders();
// Set the ContentType
this.Page.Response.ContentType = "application/pdf";
// Write the file into the response (TransmitFile is for ASP.NET 2.0. In ASP.NET 1.1 you have to use WriteFile instead)
this.Page.Response.WriteFile(file.FullName);
// End the response
this.Page.Response.End();
}
I tried using this.Page.Response.TransmitFile(file.FullName); and it also does not work. The page seems to stop functioning after this.Page.Response.End();
Any ideas?

No matter where file a stored. Your action must return a file as the result:
public FileResult GetBytes()
{
string path = Server.MapPath("~/Files/PDFIcon.pdf");
byte[] mas = System.IO.File.ReadAllBytes(path);
string file_type = "application/pdf";
string file_name = "PDFIcon.pdf";
return File(mas, file_type, file_name);
}
Server.MapPath(filePath string) - must have access to the file.

I am able to do a workaround by copying the files first from the network drive to local path and then do a TransmitFile from there:
FileInfo file = new FileInfo(GetDocumentUploadFolder(ID) + fileName);
string strFolder = Server.MapPath(LocalLocation);
string strDestination = Server.MapPath(LocalLocation + "\\" + fileName);
// Checking if file exists
if (file.Exists)
{
if (!Directory.Exists(strFolder))
Directory.CreateDirectory(strFolder);
// Delete contents in this folder
Common.DeleteFiles(strFolder, "*.*");
file.CopyTo(strDestination, true);
// Clear the content of the response
this.Page.Response.ClearContent();
// Clear the header of the response
this.Page.Response.ClearHeaders();
// Set the ContentType
this.Page.Response.ContentType = "application/pdf";
// Write the file into the response (TransmitFile is for ASP.NET 2.0. In ASP.NET 1.1 you have to use WriteFile instead)
this.Page.Response.TransmitFile(strDestination);
// End the response
this.Page.Response.End();
}

Abcpdf HttpContent.Create FileNotFoundException in ASP.net mvc context but file exist

I use Abcpdf,
Sometimes I get in production FileNotFoundException after creation of HttpMultipartMimeForm with path use by the HttpContent.Create( methode
The major part of time this code works well
The PDF is creat in context where
ASP.NET website A is called
A call website B to generate the PDF
Website B call url on B for HTML to PDF abcpdf method.
After previous request to B is finish, website A send file to server C via HttpClient HttpMultipartMimeForm and Exception is throw sometimes, but when I look on the server the file exist
A and B is on the same machine and sharing the same directories.
I supposed that the file is not finish to write on disk when I try to acces on it. But how to resolved this ?
Thanks.
1. Server A
using (HttpClient pdfClient = new HttpClient("http://" + ConfigurationManager.AppSettings["xxx"]))
{
using (HttpResponseMessage message = pdfClient.Get(UrlDictionary.callxxx(xxxID, xxxID)))
{
message.EnsureStatusIsSuccessful();
message.Content.ReadAsStream();
}
}
2. Server B
theDoc.Save(HostingEnvironment.ApplicationPhysicalPath + "/xxx/" + ".pdf");
theDoc.Clear();
3. Server A
HttpMultipartMimeForm request = new HttpMultipartMimeForm();
FileInfo info = new FileInfo(pathFile);
HttpFormFile file = new HttpFormFile();
file.Content = **HttpContent.Create(info, "multipart/form-data")**; (Exception FileNotFoundException)
file.FileName = info.Name;
file.Name = "file";
request.Files.Add(file);
request.Add("id", id);
using (HttpResponseMessage response = client.Post(
string.Format("/xxx/{0}", id),
request.CreateHttpContent()))
{
ExceptionIfBadRequest(response);
Contrat contrat = (Contrat)FromXml(response.Content.ReadAsString(), typeof(Contrat));
return contrat;
}

Check the permissions on the PDF file and the directory, check the file doesn't have some 'zone' information attached to it.

How to select specific images and save from a particular url? (Description Inside)

I need to select and save some specific images from a site by entering the url in the textbox in my site.
I've loaded all the images from a site url, by using html agility. but now I don't know how to select and save.
For example, I enter http://flipkart.com/ in my text box, it should load all images from that page, assume it contains 9 images, if 9 images loaded from a site and displayed as a gallery, from that gallery I will select 1 image click save. it should save somewhere in my site(may be a particular folder).
I don't know how to save images from a site.
would somebody give some reference or ideas to achieve this task of saving the image that is loaded when a url is given.
Thanks!

string imageUri = "http://www.contoso.com/library/homepage/images/";
string fileName = "ms-banner.gif", myStringWebResource = null;
// Create a new WebClient instance.
WebClient myWebClient = new WebClient();
// Concatenate the domain with the Web resource filename.
myStringWebResource = remoteUri + fileName;
Console.WriteLine("Downloading File \"{0}\" from \"{1}\" .......\n\n", fileName, myStringWebResource);
// Download the Web resource and save it into the current filesystem folder.
myWebClient.DownloadFile(myStringWebResource,fileName);
Console.WriteLine("Successfully Downloaded File \"{0}\" from \"{1}\"", fileName, myStringWebResource);
In myStringWebResource you will mention the path to you folder. I assume you are doing it from the same website on which you want to save the image
EDIT:
I've seen that, but can we use a webclient to load all images from a site. for example if I gave flipkart.com, will it display all images in that page. – Gopinath Perumal
First you need to get the html as string from web client
Then you need to find all the uri in th string which ends with .jpg, .jpeg, .png, .gif etc etc
Iterate the webclient and download each image
But beware, programatically crawling like this is not permitted by many site.

I googled about this and got the below code,
public System.Drawing.Image DownloadImageFromUrl(string imageUrl)
{
System.Drawing.Image image = null;
try
{
System.Net.HttpWebRequest webRequest = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(imageUrl);
webRequest.AllowWriteStreamBuffering = true;
webRequest.Timeout = 30000;
System.Net.WebResponse webResponse = webRequest.GetResponse();
System.IO.Stream stream = webResponse.GetResponseStream();
image = System.Drawing.Image.FromStream(stream);
webResponse.Close();
}
catch (Exception ex)
{
return null;
}
return image;
}
u use this code and save this as an image of desired format.
while saving the image you should mention the Folder/destination path.

Automate WebBrowser.ShowSaveAsDialog() or alternative method

Basically I wan't to save an image loaded in a webBrowser control. The only way I can get this to work at the moment is by showing the save as dialog.
is there a way to pass in a path and make it save itself? (hide the dialog I ask to show!)
is there another way to save the image? I can't seem to get documentstream to work. I have also tried webclient.filedownload(...) but get an error 302 ( "(302) Found Redirect.")
DownloadFileAsync gives no error but an empty jpeg file?
files are always jpegs, but not always at same location.

You should go with HttpWebRequest.
It has the capability to follow a 302 automatically.
var myHttpWebRequest = (HttpWebRequest)WebRequest.Create("http://www.contoso.com");
//increase this number if there are more then one redirects.
myHttpWebRequest.MaximumAutomaticRedirections = 1;
myHttpWebRequest.AllowAutoRedirect = true;
var myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
var buff = new byte[myHttpWebResponse.ContentLength];
// here you specify the path to the file. The path in this example is : image.jpg
// if you want to store it in the application root use:
// AppDomain.CurrentDomain.BaseDirectory + "\\image.jpg"
using (var sw = new BinaryWriter(File.Open("c:\\image.jpg", FileMode.OpenOrCreate)))
{
using (var br = new BinaryReader (myHttpWebResponse.GetResponseStream ()))
{
br.Read(buff, 0, (int)myHttpWebResponse.ContentLength);
sw.Write(buff);
}
}