csImageFile and csASPUpload - Demo of uploading, resizing and saving images in ASP
This demonstration shows how to capture images that are uploaded in an html form, resize them and save them to disk on the server. The files needed can be downloaded below, together with the trial components.
There are 4 web pages which must all be put in the same folder. A sub folder must be created below this with the name "files". The Internet Guest User must have Modify permission on this sub folder because the demo will need to be able to create and delete files. The demo assumes the trial versions of csASPUpload and csImageFile are being used although it can easily be modified to use the full versions.
Download the example - fileresize.zip (41 KB)
Download the trial csImageFile component - csift.zip (4.5 MB)
Download the trial csASPUpload component - csupt.zip (2.2 MB)
The sample files are listed below. The readme.txt file contains a description of what each file does and how to make the demo work.
| File | Description |
|---|---|
| fileupload.htm | The starting page. It contains an html form for uploading a file. |
| filesave.asp | This is the script that handles the form data. It uses the csASPUpload & csImageFile components to capture, resize and save the image. |
| view.asp | This script uses the File System Object to list the files already uploaded. |
| delete.asp | This script uses the File System Object to delete selected files that have been uploaded. |
| readme.pdf | A description of the application. |
Some of the key points will be explained here, although a description is given in the readme.pdf file.
fileupload.htm - The HTML form that uploads the file
This is the starting page. It contains an HTML form with an input type of file. It is important to set the "enctype" attribute:
<form method="post" action="filesave.asp" enctype="multipart/form-data">
<input type="file" name="filesent">
<input type="submit" value="Send File">
filesave.asp - The script that resizes and saves the image
This is the script that uses the components to resize and save the file. First the instances of each component are created. These lines must be modified if you use the full or 64 bit versions.
Set Upload = Server.CreateObject("csASPUpload32Trial.Process")
Set Image = Server.CreateObject("csImageFileTrial.Manage")
The main part of the script consists of an If..Then..Else construct which checks if a file has been uploaded, passes it to csImageFile, resizes and saves it. If no file was attached it shows a message. It is recommended to always use the FileQTY property to check for a file before attempting to process it. Further error handling could be introduced by using "On Error Resume Next" before the ReadVariant command to allow a graceful failure if the image is unreadable. We have removed this to keep the example simple.
<%
Width = 200
Height = 100
Upload.Read
If Upload.FileQty > 0 Then
Image.ReadVariant Upload.FileData(0)
Image.ResizeFit Width, Height
Image.WriteFile Server.MapPath("./files/") & "\" & Upload.FileName(0)
'The file has been stored
Else
'No file was received
End If
%>
The ReadVariant method takes the binary data of the image as a parameter. The FileData property is the file in the appropriate binary format. Note FileData requires an index which is always zero when a single file is uploaded.
view.asp & delete.asp - Scripts to view and delete uploaded files
These two scripts are included to make the demo application more usable. view.asp links to each file in the "files" folder and provides a delete button for each file.
We have variation of this demo available that uses our csASPUpload component on its own to save uploaded files.
- Other ASP examples using csImageFile:
- Simple Resize - code for resizing an image to fit a box and for displaying thumbnails from a directory.
- Upload to Database and Resize - example of using csASPUpload and MS Access.
- Simple Counter - an example to create a counter by joining digit images.
- File Info - an example of reading and editing JPEG meta data.
- Multipage TIFFs - an example showing how to view pages in a multipage TIFF.
There are some working exmples in our live demonstration area.
For a full list of available ASP demos and tutorials - Click Here.