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How to convert PDF Base64 into pdf then PDF into an image in C#

following is the code added:
The image object is in the library.imaging.
"using System.Drawing;"
"using System.Drawing.Imaging;"
{
byte[] b = Convert.FromBase64String("R0lGODlhAQABAIAAA");
Image image;
using (MemoryStream memstr = new MemoryStream(b))
{
image = Image.FromStream(memstr);
}
}
Here is the new code I'm working on:
{
string base64BinaryStr = " ";
byte[] PDFDecoded = Convert.FromBase64String(base64BinaryStr);
string FileName = (#"C:\Users\Downloads\PDF " + DateTime.Now.ToString("dd-MM-yyyy-hh-mm"));
BinaryWriter writer = new BinaryWriter(File.Create(FileName + ".pdf"));
writer.Write(PDFDecoded);
string s = Encoding.UTF8.GetString(PDFDecoded);
}

So this is your current code:
byte[] PDFDecoded = Convert.FromBase64String(base64BinaryStr);
string FileName = (#"C:\Users\Downloads\PDF " + DateTime.Now.ToString("dd-MM-yyyy-hh-mm"));
BinaryWriter writer = new BinaryWriter(File.Create(FileName + ".pdf"));
writer.Write(PDFDecoded);
You don't actually need BinaryWriter for this. File.Create already gives you a FileStream:
FileStream writer = File.Create(FileName + ".pdf");
writer.Write(PDFDecoded, 0, PDFDecoded.Length);
But this will still have the problem you're experiencing because you're not flushing the data to it. We also need to close the file. Thankfully, we can wrap it in using and it will do both for us:
using (FileStream writer = File.Create(FileName + ".pdf"))
{
writer.Write(PDFDecoded, 0, PDFDecoded.Length);
}
But a simpler way to do this is:
File.WriteAllBytes(FileName + ".pdf", PDFDecoded);
As for PDF -> Image, you'll probably have to see if there is a library available for this (search "PDF to Image NuGet") that can help you with this as I don't think there is anything built-in.

Just a thought, you don't need to create a physical PDF file, you can have it in memory and convert it to image from there.
Now the problem is that you cannot use Image from System.Drawing.Imaging for this, it doesn't support reading PDF file.
Instead you'll need to search for some library that can do that.
For example, try GemBox.Pdf, you can use it like this:
string base64String = "...";
byte[] pdfBytes = Convert.FromBase64String(base64String);
using (PdfDocument pdfDocument = PdfDocument.Load(new MemoryStream(pdfBytes)))
{
ImageSaveOptions imageOptions = new ImageSaveOptions(ImageSaveFormat.Png);
string imageName = DateTime.Now.ToString("dd-MM-yyyy-hh-mm") + ".png";
pdfDocument.Save(#"C:\Users\Downloads\" + imageName, imageOptions);
}
I've used the code provided on this Convert example.

Getting a file from "file://A/"

How can I get a file from external path same as "file://A/B/C/D/"
In local machine I have access to the path of "file://" but the user has not access.
Now I want to read some files from "file://A/B/C/D/" and make downloadable for user.
How can I do it?
(current directory is "https://localhost:44331/")
public async Task<IActionResult> DownloadDocument(string berichtsnummer)
{
var constantPath = "file://A/B/C/D/";
using (FileStream fileStream = System.IO.File.OpenRead(constantPath))
{
MemoryStream memStream = new MemoryStream();
memStream.SetLength(fileStream.Length);
fileStream.Read(memStream.GetBuffer(), 0, (int)fileStream.Length);
return File(fileStream, "application/octet-stream");
}
}
when I click to download link, I get this error:
"IOException: The syntax for filename, directory name, or volume label
is incorrect:"
[
A view of path "file://A/B/C/D/":

A local file path is not "file://". You can read the file normally using the local file path as
var path = "C:\\...";
and then send to content to the client browser.
If the file is not on the local machine, the only way is to access it using a network share. You can then use UNC paths, like
var path = #"\\Server\Path\...";

That's important to change the constantPath to "\\\\A\\B\\C\\D\\"
private string[] GetListOfDocumentLink()
{
string path = string.Empty;
string constantPath = "\\\\A\\B\\C\\D\\";
string folderName = string.Empty;
string year = string.Empty;
// determine folderName and year.
path = constantPath
+ Path.DirectorySeparatorChar.ToString()
+ folderName
+ Path.DirectorySeparatorChar.ToString()
+ year;
var filter = Berichtsnummer + "*.pdf";
string[] allFiles = Directory.GetFiles(path, filter);
return allFiles;
}
Now you can send the path to DownloadDocument method:
public async Task<IActionResult> DownloadDocument(string path)
{
byte[] berichtData = null;
FileInfo fileInfo = new FileInfo(path);
long berichtFileLength = fileInfo.Length;
FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);
BinaryReader br = new BinaryReader(fs);
berichtData = br.ReadBytes((int)berichtFileLength);
return File(berichtData, MimeTypeHelper.GetMimeType("pdf"));
}

Check FileName From HttpHostedFileBase is File Name or File Path

I am developing an application which store filename in database. For Mozilla & Chrome it is showing FileName only but in IE it is showing full path of file. Now I want to check whether given filename is filename or filepath. Is there any way to do it?
Here is my code:
public ActionResult Save(IEnumerable<HttpPostedFileBase> attachments)
{
byte[] image = null;
var file = attachments.First();
// Some browsers send file names with full path. We only care about the file name.
string filePath = Server.MapPath(General.FaxFolder + "/" + file.FileName);
file.SaveAs(filePath);
FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
using (BinaryReader br = new BinaryReader(fs))
{
image = br.ReadBytes((int)fs.Length);
}
TempData["Image"] = image;
System.IO.File.Delete(filePath);
return Json(new { status = "OK", imageString = Convert.ToBase64String(image) }, "text/plain");
}

Well,If you go with getting filename only in any browser then you should write
Path.GetFileName(e.fileName);
It will return filename only in any browser
Thanks

Instead of check whether the file has a path or not, what you can do is to just use
GetFileName(path);method

Save an image on asp.net server

I'm trying to save a piture recovered from a byte[] on the asp.net server. Here is my code :
MemoryStream ms = new MemoryStream(cli.LOGO, 0, cli.LOGO.Length);
ms.Write(cli.LOGO, 0, cli.LOGO.Length);
string thePath = Server.MapPath("~/App_Data");
string wholePath = thePath + "\\logo.jpg";
FileStream fs = new FileStream(wholePath, FileMode.Create);
BinaryWriter bw = new BinaryWriter(fs);
bw.Write(cli.LOGO);
bw.Close();
Where cli.LOGO is a byte array. I'm just trying to save it as a .jpg image in my App_Data folder (or anything else of course) but... It's doing nothing. cli.LOGO is not empty, but the file is not created... Why so ? Is it the proper way to save an image ? Thanks !

Try like this which is a bit shorter than your code:
string path = Server.MapPath("~/App_Data/logo.jpg");
File.WriteAllBytes("file", cli.LOGO);

try doing this
if (Request.Files["Photo"] != null)
{
string path = "/uploads/" + DateTime.Now.Ticks.ToString() + "_" + Request.Files["Photo"].FileName;
Request.Files["Photo"].SaveAs(Server.MapPath(path));
SP.PhotoPath = path;
//The MapPath method maps the specified relative or virtual path to the
//corresponding physical directory on the server.
}

File upload in asp.net c#

hey guys, m using an api of "Bits on the Run" following is the code of upload API
public string Upload(string uploadUrl, NameValueCollection args, string filePath)
{
_queryString = args; //no required args
WebClient client = createWebClient();
_queryString["api_format"] = APIFormat ?? "xml"; //xml if not specified - normally set in required args routine
queryStringToArgs();
string callUrl = _apiURL + uploadUrl + "?" + _args;
callUrl = uploadUrl + "?" + _args;
try {
byte[] response = client.UploadFile(callUrl, filePath);
return Encoding.UTF8.GetString(response);
} catch {
return "";
}
}
and below is my code to upload a file, m using FileUpload control to get the full path of a file(but m not succeeded in that)...
botr = new BotR.API.BotRAPI("key", "secret_code");
var response = doc.Descendants("link").FirstOrDefault();
string url = string.Format("{0}://{1}{2}", response.Element("protocol").Value, response.Element("address").Value, response.Element("path").Value);
//here i want fullpath of the file, how can i achieve that here
string filePath = fileUpload.PostedFile.FileName;//"C://Documents and Settings//rkrishna//My Documents//Visual Studio 2008//Projects//BitsOnTheRun//BitsOnTheRun//rough_test.mp4";
col = new NameValueCollection();
FileStream fs = new FileStream(filePath, FileMode.Open);
col["file_size"] = fs.Length.ToString();
col["file_md5"] = BitConverter.ToString(HashAlgorithm.Create("MD5").ComputeHash(fs)).Replace("-", "").ToLower();
col["key"] = response.Element("query").Element("key").Value;
col["token"] = response.Element("query").Element("token").Value;
fs.Dispose();
string uploadResponse = botr.Upload(url, col, filePath);
i read in some forums saying that for some security purpose you can't get fullpath of a file from client side. If it is true then how can i achieve file upload in my scenario ?

Yes, this is true, for security reason you cannot get the fullpath of the client machine, what you can do is, try the following,
Stream stream = fileUpload.PostedFile.InputStream;
stream.Read(bytes, 0, fileUpload.PostedFile.ContentLength);
instead of creating your own FileStream use the stream provided by the FileUploadControl. Hoep it shall help.