SQL Server :: Writing/Saving DataType Image As File To Disk?
Mar 16, 2011
i need to save multiple documents stored in SQL server as Image type to disk.
What i want to do is "backup" all files in a table (column) to disk, zip them and Response.TransmitFile(FilePath) to client.
I could use C# ot VB but that would require a lot of connections to database or a lot of server memory and i don't want that, becauze there are a lot of files to be saved Since SQL can write files to disk i was thinking about saving those files to disk directly from sql. Something like when u're doing a backup
What are the options for handling file uploads to reduce the memory footprint? Is there a way to upload in chunks? Is there a way to stream upload directly to disk instead of loading entire file in server memory?
I am using ASP.NET 3.5 with iTextSharp and I have the following code:
var templatePath = Server.MapPath(@"~/Templates/template1.pdf"); var newFilePath = Server.MapPath(@"~/TempFiles/new.pdf"); PdfReader pdfReader = new PdfReader(templatePath); PdfStamper pdfStamper = new PdfStamper(pdfReader, new FileStream(newFilePath, FileMode.Create)); AcroFields pdfFormFields = pdfStamper.AcroFields; pdfFormFields.SetField("Box1", "007"); pdfFormFields.SetField("Box2", "123456"); pdfStamper.FormFlattening = false; pdfStamper.Close(); Response.ClearContent(); Response.Buffer = true; Response.ContentType = "application/pdf"; Response.AddHeader("Content-Disposition", "attachment;filename=new.pdf")); Response.WriteFile(newFilePath); Response.End();
The above code fills out a pdf file and saves the new file to the TempFiles folder. It then prompts the user to either save or open the file. Can I achieve the same functionality without saving the file to the TempFiles location?
I need to be able to read an excel file from a file upload control but I can not save the file to disk first, it must be done in memory.
[Code]....
Above is my code for reading the data file if it IS saved to disk, but again, I have to be able to do this without saving the file to disk, it must be done in memory. I have not been able to find any sample code anywhere on how to do this from memory, everything seems to force the file be uploaded, saved to disk, and then read in the connection string, which again I can not do.
My website provides a facility to upload images, using the ASP.NET FileUpload control. We accept both jpeg and tiff formats but I have just decided that all tiffs should be converted to jpegs at the time of upload. If possible, I want to avoid saving the original tiff to disk. I would any sample coding for achieving this conversion prior to saving (ideally in VB.NET, though I could always run C# code through a converter).
My website provides a facility to upload images, using the ASP.NET FileUpload control. We accept both jpeg and tiff formats but I have just decided that all tiffs should be converted to jpegs at the time of upload. If possible, I want to avoid saving the original tiff to disk.
I would appreciate any sample coding suggestions for achieving this conversion prior to saving (ideally in VB.NET, though I could always run C# code through a converter).
In MSSQL server 2005/2008, we have one column (in a table) declares as "Image" type. What data type in C# so I can grab that value in that column in our class? Can string handle it or byte[]?
I'm just now created Dynamic Data Entities Web Site. And I have got a problem with image type. for all sql data types generated html elements by fieldTemplate. So, how can I create fieldtemplate for image-view, and image-upload?
i wanted to store image in sqlserver database image field and i did. But now in some cases i want to store null value in that image field how to do this using file uploader.
On my MVC2 web application I have a form that a user can enter dates, times, comments etc for appointments with clients. We then give him the oppertunity to download it as a vCalendar file. So far, on my controller I have the following code (I have just included the string that stored my vCard data) :
[Code]....
I have worked with uploading and downloading binary files within MVC, but working with stuff like this I am totally lost. This code needs to be saved as a .vcs from withing the client's browser. My return value looks something like this :
We have encountered this difference in file creation while using a HttpHandler Versus a Code Behind Aspx page. We are reading a saved jpg/png picture as byte array from a 'Image' field in sql server database and create a physical file in the server. Both the Aspx Page and Httphandler use the same code pasted below.
//Begin int docID = Convert.ToInt32(Request.QueryString["DocID"]); var docRow = documentDB.GetDocument(docID); // Retrieve the physical directory path for the Uploads subdirectory string destDir = Server.MapPath("../../Uploads").ToString() + "\"; string strFileName = destDir + DateTime.Now.ToFileTime() + "_" + docRow.DocName.ToString(); FileStream fs = new FileStream(strFileName, FileMode.CreateNew, FileAccess.Write); fs.Write(docRow.DocData, 0, docRow.DocData.Length); fs.Flush(); fs.Close(); // End
After the file is created, it is viewable as a jpg/png Image only in Aspx Code Behind. While in case of HttpHandler it is not a valid Image.
In of my application I am using the database to store and retrive images. The table stores the documents and the datatype of the field is IMage.
Now with Sql Server 2008, i would like to upgrade this to use this new feature. WHat changes do I have to make in terms of code and also in the database.
i want to export an excel from my web application and want to save it on Web Server, but i am not able to save it on web server, i am able to do it on my local machine, but on web server it's not working.
how to download a file , from sql server 2005 to local disk.
using asp.net and c# as my code behind, when i click on gridview column, a pop up windows should appear asking fr the path to save in local disk, when name is entered and save button is clicked, that particular file should get saved in disk.
I've created 2 web user controls. A = User control that displays an image, and B is the user control that hosts A. I'm trying to stream an array of bytes to A, but it seems like the Response.BinaryWrite method completely overwrites any heirachial controls (I can't see any of B's other controls besides the image).
How do I get A to just display the image from the byte stream? It doesn't come from a database, it's an image I created on the fly.
I have very basic knowledge of ASP.net. I am using following script to resize and image, but the problem is it increases the disk volume of resized image to almost 4 times or original image.
Example:
Original Image: 1024 x 769px and Disk space: 135 KB Resized Image: 600 x 380px and Disk space: 825KB Notice resized image becomes 825KB.
I am trying to save some resized images to the server. Why I get the following error on the vSmlImgFle.Save(vTmpDir.ToString & vFile.Name, ImageFormat.Jpeg) (in red below) line?
A generic error occurred in GDI+.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Runtime.InteropServices.ExternalException: A generic error occurred in GDI+.
And while we are on the subject of dealing with image files, is there a way to get the file format from the original file, rather than looking at the file extension to determine the file type:
If Ext = "JPG" then Type = ImageFormat.Jpeg Else if Ext = "JPG" then Etc.
I thought that vImgFormat = vOrgImgFle.RawFormat might do it but that seems to return something completely different than ImageFormat.Jpeg.
Code: Protected Function CopyScaleImages(ByVal FileSet As FileInfo()) Dim vTmpDir As New DirectoryInfo(Server.MapPath("~/SanInspPhotosTemp/")) Dim vDir As New DirectoryInfo(Server.MapPath("~/SanInspPhotos/")) Dim imgHght As Integer
I'm populating a generic list from an excel file that contains names of pdf files. Now I want to take each item in the list and create a file from it. Here's what I have so far:
[Code]....
So now, the list called lines contains names of 900 pdf files. How would I take those names out of the list and create files from them?
