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<TITLE>AspUpload.com - User Manual. Chapter 7</TITLE>
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<IMG SRC="sq.gif"><IMG SRC="sq.gif"><IMG SRC="sq.gif"><IMG SRC="sq.gif"><IMG SRC="square_small.gif"> <A HREF="manual_intro.html">1. Introduction</A><BR>
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<IMG SRC="sq.gif"><IMG SRC="sq.gif"><IMG SRC="sq.gif"><IMG SRC="sq.gif"><IMG SRC="square_small_pressed.gif"> 7. Images<BR>
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<A HREF="manual_unicode.html"><IMG BORDER="0" SRC="next.gif" ALIGN="RIGHT" ALT="Chapter 8: Unicode Support"></A>
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<B><U><FONT SIZE="3" COLOR="#990000">Chapter 7. Image Handling</FONT></U></B>
<P>
<B><FONT COLOR="#0000A0">Image Size and Type Extraction</FONT></B>
<BLOCKQUOTE>
AspUpload is capable of determining the type and pixel size
of uploaded images. The formats currently supported are GIF, JPEG, BMP and PNG.
The type and size information is returned via the properties
<B>File.ImageType</B>, <B>File.ImageWidth</B>, and <B>File.ImageHeight</B>.
<P>
The property <B>File.ImageType</B>
returns the strings <B>"GIF"</B>, <B>"JPG"</B>, <B>"BMP"</B>, <B>"PNG"</B>
(for GIF JPEG BMP and PNG images, respectively), or <B>"UNKNOWN"</B>
if the file is not an image or of an unknown image type.
<P>
The properties <B>File.ImageWidth</B> and <B>File.ImageHeight</B>
return the image width and height in pixels, or 0
if the file is not an image.
<P>
The code samples <B>size.asp</B> and <B>size_upload.asp</B>
demonstrate the usage of these properties.
<P>
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<!--#include file="AspUpload.inc"--><P>
<HTML><BR>
<BODY><BR>
<%<BR>
Set Upload = Server.CreateObject("Persits.Upload")<P>
' Capture and save uploaded image<BR>
Upload.Save "c:\upload"<P>
For Each File in Upload.Files<BR>
If File.ImageType = "UNKNOWN" Then<BR>
Response.Write "This is now an image."<BR>
Response.End<BR>
End If<P>
Response.Write File.Path & "<BR>"<BR>
Response.Write "Type: " & File.ImageType & "<BR>"<BR>
Response.Write "Size: " & File.ImageWidth & " x " & File.ImageHeight & " pixels"<BR>
Next<BR>
%><BR>
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<P>
Click the link below to run this code sample:
<P>
<B><A TARGET="_new" HREF="http://localhost/aspupload/07_image/size.asp">http://localhost/aspupload/07_image/size.asp</A></B>
<A HREF="javascript:;" OnClick="open('helppopup.html','','width=400,height=400');"><IMG SRC="help.gif" BORDER="0" ALT="Why is this link not working?"></A>
</BLOCKQUOTE>
<B><FONT COLOR="#0000A0">Image Resizing</FONT></B>
<BLOCKQUOTE>
AspUpload can be used in conjunction with another Persits Software
component, <B><A HREF="aspjpeg.html">AspJpeg</A></B>, to create resized versions and thumbnails
of JPEG images. An evaluation copy of AspJpeg can be downloaded <A HREF="download.html">here</A>.
<P>
The code samples <B>resize.asp</B> and <B>resize_upload.asp</B>
demonstrate how AspJpeg can be used to resize a newly uploaded JPEG
image. The uploaded and resized images are saved in the same directory
as the ASP scripts, rather than the usual c:\upload folder,
to be able to display both images in the browser easily.
<P>
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<%<BR>
Set Upload = Server.CreateObject("Persits.Upload")<P>
' Use AspJpeg to resize image<BR>
Set Jpeg = Server.CreateObject("Persits.Jpeg")<P>
' Capture and save uploaded image to the same directory as script<BR>
Upload.Save Server.MapPath(".")<P>
For Each File in Upload.Files<BR>
If File.ImageType <> "JPG" Then<BR>
Response.Write "This is now a JPGE image."<BR>
File.Delete<BR>
Response.End<BR>
End If<P>
Jpeg.Open File.Path<P>
Scale = Upload.Form("Scale")<BR>
Jpeg.Width = Jpeg.OriginalWidth * Scale / 100<BR>
Jpeg.Height = Jpeg.OriginalHeight * Scale / 100<BR>
Response.Write Jpeg.OriginalHeight & "-" & Jpeg.Height<BR>
Jpeg.Save Server.MapPath(".") & "\small_" & File.FileName<BR>
%><BR>
<IMG SRC="<% = File.FileName %>"><BR><BR>
<IMG SRC="<% = "small_" & File.FileName %>"><P><BR>
<%<BR>
Next<BR>
%><BR>
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<P>
Click the link below to run this code sample:
<P>
<B><A TARGET="_new" HREF="http://localhost/aspupload/07_image/resize.asp">http://localhost/aspupload/07_image/resize.asp</A></B>
<A HREF="javascript:;" OnClick="open('helppopup.html','','width=400,height=400');"><IMG SRC="help.gif" BORDER="0" ALT="Why is this link not working?"></A>
<P>
AspJpeg comes with many more code samples.
A <A HREF="livedemo.html">live demo</A> is also available.
<P>
<A HREF="manual_unicode.html"><IMG BORDER="0" SRC="next.gif" ALIGN="RIGHT" ALT="Chapter 8: Unicode Support"></A>
<A HREF="manual_security.html"><IMG BORDER="0" SRC="previous.gif" ALIGN="RIGHT" ALT="Chapter 6: User Impersonation and Permissions"></A>
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Copyright © 1998 - 2001 <A HREF="http://www.persits.com">Persits Software, Inc.</A><BR>
All Rights Reserved<BR>
AspUpload® is a registered trademark of Persits Software, Inc.<BR>
Questions? Comments? <A HREF="MAILTO:info@aspupload.com">Write us!</A>
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