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Home > Products >DEXTUpload.NET Professional > Code Sample |
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 File
Upload Default |
| 1. Simple File Upload |
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Page
(SimpleUpload.aspx) having the Form to be transmitted is made as the following
form.
[SimpleUpload.aspx]
<%@ Page ... %>
<HTML>
<BODY>
<FORM NAME= "writeform" METHOD= "post"ACTION="SU_Process.aspx?ProgressID=0"
ENCTYPE="multipart/form-data">
<INPUT TYPE="file" NAME="file1"><BR>
<INPUT TYPE="submit" VALUE="upload">
</FORM>
</BODY>
</HTML>
In order to transmit Form including file data<input type= "file" ID="File1"
NAME="File1">,
ENCTYPE="multipart/form-data" designated in Form tag can not be omitted. The
following.
(SimpleUpload.aspx) is the page that proceeds file upload.
[SU_Process.aspx.cs]
…
private void Page_Load(object sender, System.EventArgs e)
{
using (DEXTUpload.NET.FileUpload fileUpload = new DEXTUpload.NET.FileUpload())
{
fileUpload.Save();
// fileUpload["file1"].Save(); <-- same paragraph
// fileUpload["file1"][0].Save(); <-- same paragraph
}
}
…
IF you want to change the default path according to the code above, the
uploaded file is saved to default path "c:\". You should enter code just like
uploadform.DefaultPath = "c:\temp" next to object
generating code uploadform.Save is the method that uploaded files is saved to
server as a form of disk file,
it is identical to uploadform("file1") .Save.
In this case, "file 1"should be the same with the name corresponding to NAME
property in
<INPUT TYPE="file" NAME="file1" ID="File1">. For more detailed
explanation for Save function,
see following below "various Save Methods"
※ Like "Multiple Upload" example, in case when there are several <INPUT
TYPE= "file"... ID="File1"
NAME="File1">sections, Expressions such as uloadform.Save,
uploadform.SaveAs, uploadform.SaveVirtual,
uploadform.SaveAsVirtual, uploadform.SaveAsBlob, uploadform.FileLen,
uploadform.FileName,
uploadform.FilePath, uploadform.MimeType are identical to
uploadform("file1").xxx. among several
<INPUT TYPE= "file"... ID= "File2" NAME= "File2">sections, it shows the
first file section. |
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| 2. Multiple File Upload
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The
following example shows the multiple files upload concurrently
[MultipleUpload.aspx]
<%@ Page ... %>
<HTML>
<BODY>
<FORM NAME= "writeform" METHOD= "post"ACTION="MU_Process.aspx?ProgressID=0"
ENCTYPE="multipart/form-data">
<INPUT TYPE="file" NAME="file1"><BR>
<INPUT TYPE="file" NAME="file2"><BR>
<INPUT TYPE="file" NAME="file3"><BR>
<INPUT TYPE="submit" VALUE="upload">
</FORM>
</BODY>
</HTML>
[MU_Process.aspx.cs]
…
private void Page_Load(object sender, System.EventArgs e)
{
using (DEXTUpload.NET.FileUpload fileUpload = new DEXTUpload.NET.FileUpload())
{
fileUpload[“file1”].Save();
fileUpload[“file2”].Save();
fileUpload[“file3”].Save();
}
}
…
The reference to uploaded files is made by the value of property such as NAME(
"file1", "file2", "file3").
With another method, they can be saved at a time by using the following
repetition after designating
NAME property of various INPUT item as a same value. The following is an
example that shows this.
[MultipleUpload2.aspx]
<%@ Page ... %>
<HTML>
<BODY>
<FORM NAME= "writeform" METHOD= "post"ACTION="MU_Process.aspx?ProgressID=0"
ENCTYPE="multipart/form-data">
<INPUT TYPE="file" NAME="files"><BR>
<INPUT TYPE="file" NAME="files"><BR>
<INPUT TYPE="file" NAME="files"><BR>
<INPUT TYPE="submit" VALUE="upload">
</FORM>
</BODY>
</HTML>
[MU_Process2.aspx.cs]
…
private void Page_Load(object sender, System.EventArgs e)
{
using (DEXTUpload.NET.FileUpload fileUpload = new DEXTUpload.NET.FileUpload())
{
for (int i = 0; i < fileUpload["files"].Count; i++)
fileUpload["files"][i].Save();
}
}
…
The reference to uploaded files is made by the value of property such as NAME(
"file1", "file2", "file3").
With another method, they can be saved at a time by using the following
repetition after designating
NAME property of various INPUT items as a same value. The following is an
example that shows this
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In
the example above, you may same result if the form is written by following .
foreach (DEXTUpload.NET.FormElement member in fileUpload["files"])
member.Save(); |
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| 3. Concurrent Upload with other form elements |
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Like
file element, the other elements of Form can be referred by the value of NAME
property.
[UploadElements.aspx]
<%@ Page ... %>
<HTML>
<BODY>
<FORM NAME= "writeform" METHOD= "post"ACTION="UE_Process.aspx?ProgressID=0"
ENCTYPE="multipart/form-data">
<INPUT TYPE="text" NAME="title"><BR>
<TEXTAREA NAME="content" ROWS="10" COLS="50"></TEXTAREA><BR>
<INPUT TYPE="file" NAME="file1"><BR>
<INPUT TYPE="submit" VALUE="upload">
</FORM>
</BODY>
</HTML>
[UE_Process.aspx.cs]
…
private void Page_Load(object sender, System.EventArgs e)
{
using (DEXTUpload.NET.FileUpload fileUpload = new DEXTUpload.NET.FileUpload())
{
string title = fileUpload[“title”].Value;
string content = fileUpload[“content”].Value;
fileUpload[“file1”].Save();
}
}
… |
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| 4. Upload including multi selected Form element |
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In
case of handling Multi select Form element that may have multiple values for
one Name properties such
as ListBox, Radio button, DEXTUpload can handle this conveniently as the case
of Request.Form
[UploadMultiElements.aspx]
<%@ Page ... %>
<HTML>
<BODY>
<FORM NAME= "writeform" METHOD= "post"ACTION="UE_Process.asp?ProgressID=0"
ENCTYPE="multipart/form-data">
<H2>Select your favorite sports</H2>
<SELECT NAME="Sports" MULTIPLE>
<OPTION VALUE="Soccer">Soccer</OPTION>
<OPTION VALUE="Baseball">Baseball</OPTION>
<OPTION VALUE="basketball">Basketball</OPTION>
</SELECT><BR>
<INPUT TYPE="file" NAME="DescFile"><BR>
<INPUT TYPE="submit" VALUE="upload">
</FORM>
</BODY>
</HTML>
[UME_Process.aspx.cs]
…
private void Page_Load(object sender, System.EventArgs e)
{
using (DEXTUpload.NET.FileUpload fileUpload = new DEXTUpload.NET.FileUpload())
{
Response.Write(“Your favorite sports :<br>");
for (int i = 0; i < fileUpload["Sports"].Count; i++)
Response.Write("-" + fileUpload["Sports"][i].Value + "<br>");
fileUpload["DescFile"].Save();
}
}
…
In the example above, you may same result if the form is written by following .
foreach (DEXTUpload.NET.FormElement member in fileUpload["Sports "])
Response.Write("-" + member.Value + "<br>") |
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| 5. Obtaining information from uploaded files |
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In
order to obtain the file information, the following properties are provided.
.FileLen : Length of uploaded file
.FileName : Name of uploaded file(excluding path)
.FilePath : Total path of uploaded file
.MimeType : Mime Type of uploaded file
.LastSavedFileName : File name uploaded and saved in server(excluding path)
.LastSavedFilePath : Total path of file uploaded and saved in server
※ .FileName and .FilePath have a name and a value of total path for
uploaded original file.
The total path value of file uploaded and saved in
server can be obtained by using return value
such as.Save, .SaveAs Method .
[Form_Process.aspx.cs]
…
private void Page_Load(object sender, System.EventArgs e)
{
using (DEXTUpload.NET.FileUpload fileUpload = new DEXTUpload.NET.FileUpload())
{
Response.Write("[Uploaded File Information] <BR>");
Response.Write("FileName : " + fileUpload["file1"].FileName + "<BR>");
Response.Write("FileExtension : " + fileUpload["file1"].FileExtension +
"<BR>");
Response.Write("FullPath : " + fileUpload["file1"].FilePath + "<BR>");
Response.Write("FileLength : " + fileUpload["file1"].FileLength + "
Byte(s)<BR>");
Response.Write("MimeType : " + fileUpload["file1"].MimeType + "<BR>");
string uploadedPath = fileUpload["file1"].Save();
Response.Write("UploadedPath : " + uploadedPath + "<BR>");
Response.Write("LastSavedFilePath : " + fileUpload["file1"].LastSavedFilePath +
"<BR>");
Response.Write("LastSavedFileName : " + fileUpload["file1"].LastSavedFileName);
}
}
…
The result that the above page is executed will be shown as followings.
[Uploaded File Information]
FileName : sample.jpg
FullPath : c:\data\sample.jpg
FileLength : 176816 Byte(s)
MimeType : image/pjpeg
UploadedPath : d:\upload\sample.jpg
LastSavedFilePath : d:\upload\sample.jpg
LastSavedFileName : sample.jpg |
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| 6. Obtaining the width and height information of
image file (GIF/JPG/BMP) |
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In
case when the uploaded file is an image file(GIF/JPG/BMP), the additional
property will be provided to
obtain the width and height of image file as followings
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.ImageFormat
: Format of uploaded image file
.ImageWidth : Width of uploaded image file
.ImageHeight : Height of uploaded file
[Form_Process.aspx.cs]
…
private void Page_Load(object sender, System.EventArgs e)
{
using (DEXTUpload.NET.FileUpload fileUpload = new DEXTUpload.NET.FileUpload())
{
Response.Write("[Uploaded Image File Information] <BR>");
Response.Write("FileName : " + fileUpload[“file1”].FileName + "<BR>");
Response.Write("FullPath : " + fileUpload[“file1”].FilePath + "<BR>");
Response.Write("FileLength : " + fileUpload[“file1”].FileLength + "
Byte(s)<BR>");
Response.Write("MimeType : " + fileUpload[“file1”].MimeType + "<BR>");
Response.Write("ImageFormat : " + fileUpload[“file1”].ImageFormat +
"<BR>");
Response.Write("ImageWidth : " + fileUpload[“file1”].ImageWidth +
"<BR>");
Response.Write("ImageHeight : " + fileUpload[“file1”].ImageHeight +
"<BR>");
string uploadedPath = fileUpload[“file1”].Save();
Response.Write("UploadedPath : " + uploadedPath);
}
}
…
The result that the above page is executed will be shown as followings.
[Uploaded File Information]
FileName : sample.jpg
FullPath : c:\data\sample.jpg
FileLength : 176816 Byte(s)
MimeType : image/pjpeg
ImageFormat : JPG
ImageWidth : 1024
ImageHeight : 768
UploadedPath : c:\temp\sample.jpg |
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| 7. Upload into Database BLOB field |
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If
SaveAsBlob Method is used as followings, the file can be uploaded and saved
into Database BLOB field.
[Form_Process.aspx.cs]
…
private void Page_Load(object sender, System.EventArgs e)
{
string ConnectionString = "…”;
OleDbConnection cn = new OleDbConnection(ConnectionString);
cn.Open();
string strQuery = "SELECT filename, filesize, filedata FROM DEXTUPLOAD";
OleDbDataAdapter adapter = new OleDbDataAdapter(strQuery, cn);
adapter.InsertCommand = new OleDbCommand("INSERT INTO DEXTUPLOAD(filedata,
filename, filesize) VALUES (?, ?, ?)", cn);
adapter.InsertCommand.Parameters.Add(…);
adapter.InsertCommand.Parameters.Add(…);
adapter.InsertCommand.Parameters.Add(…);
adapter.MissingSchemaAction = MissingSchemaAction.AddWithKey;
DataSet ds = new DataSet();
adapter.Fill(ds);
DataRow newRow = ds.Tables[0].NewRow();
using (DEXTUpload.NET.FileUpload fileUpload = new DEXTUpload.NET.FileUpload())
{
newRow[0] = fileUpload.FileName;
newRow[1] = fileUpload.FileLength;
newRow[2] = fileUpload.SaveAsBlob();
ds.Tables[0].Rows.Add(newRow);
adapter.Update(ds);
}
cn.Close();
}
… |
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| 8. Various Save Methods
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DEXTUpload
component provides various save methods that saves the uploaded file into
server file system or database.
* Method that saves a file as a same name of uploaded file into server
- Save : save as DefaultPath property value at the designated path
- Save [Path designation] : save at the designated path
- SaveVirtual [Virtual Path designation] : save at the designated virtual path
* Method that saves a file as an other name of uploaded file into server
- SaveAs [Full Path designation] : saves at the designated path and file name
- SaveAsVirtual [Full Virtual Path designation] : saves at the designated
virtual path and file name
* The function that saves uploaded file into Database BLOB field
- SaveAsBlob [ADO Field object designation] : saves at the designated Database
BLOB field
※ All Save Methods except SaveAsBlob has an element called bOverwrite and the
total path for file saved
in the server as a return value. In case when bOverwrite element is omitted,
default is True, in case when there is a same file name in the related path, it
is overwritten . In case when the element value of
bOverwrite is set as False, the single file name is saved ( filename(2).ext,
filename(3).ext ... ). |
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| 9. Checking the existence of file and deleting
uploaded file |
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DEXTUpload
provides FileExist method that can check the existence of file and DeleteFile
method can
delete uploaded file. The following is the example that the uploaded file is
saved by using FileExists and
SaveAs method.
[Form_Process.aspx.cs]
…
private void Page_Load(object sender, System.EventArgs e)
{
using (DEXTUpload.NET.FileUpload fileUpload = new DEXTUpload.NET.FileUpload())
{
string filename = fileUpload[“file1”].Filename;
string filepath = fileUpload[“file1”].DefaultPath + "\\" + filename;
// path value to file name(excluding extension)
if (fileUpload[“file1”].FileExists(filepath))
{
string filenameonly;
string fileext;
int Index = filepath.LastIndexOf(".");
if (Index > 0)
{
// In case when there exists extension
filenameonly = filepath.Substring(0, Index); // path value to file
name(excluding extension)
fileext = filepath.Substring(Index); // "."extension with character
}
else
{
// In case when there is no extension
filenameonly = filepath;
fileext = "";
}
// Obtaining single file path
for (int i=2; ; i++)
{
filepath = filenameonly + "(" + i.ToString() + ")" + fileext;
if (!File.Exists(filepath)) break;
}
}
fileUpload["file1"].SaveAs(filepath);
// If necessary, this file may be deleted .
// fileUpload.DeleteFile(filepath);
}
}
…
※ DEXTUpload.NET provides the function that saves file as a single name
basically .
The example above is not the method provided by DEXTUpload.NET, but the case
when single file name is decided in user’s own way |
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| Applying
File Upload |
| 1. Save as Single File name |
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Save,
SaveVirtual, SaveAs, SaveAsVirtual Method is overwritten in case when uploaded
file is saved basically if there is a same file name in the related path. If
you want to save the file as a single name without
overwriting, the second element, bOverwrite should be set as False.
(see "Various Save Methodss" Chapter)
[Form_Process.aspx.cs]
…
private void Page_Load(object sender, System.EventArgs e)
{
using (DEXTUpload.NET.FileUpload fileUpload = new DEXTUpload.NET.FileUpload())
{
string UploadedFilename = fileUpload[“file1”].SaveAs(“C:\\Data\\sample.zip”,
false);
Response.Write(“uploaded file : “ + UploadedFilename);
}
}
…
In the example above, there exists
sample zip file in c:\data folder, the uploaded file is saved as the name of
"c:\data\sample(2).zip", the page is shown as following.
[ Execution Result ]
uploaded file : c:\data\sample(2).zip |
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| 2. Limiting Upload file capacity |
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If
you use MaxFileLen property, the maximum file size can be limited. In case of
uploading bigger file than the designated size, the following error may be
occured.
DEXTUpload error '80040200'
Warning: File size must be less than 5242880 Bytes.
/form_process.asp, line 27
Like following example, the maximum file size is not exceeded by using FileLen
property, and calling Save Method The limitation to the upload file size may be
customized without occurring error.
[Form_Process.aspx.cs]
…
private void Page_Load(object sender, System.EventArgs e)
{
using (DEXTUpload.NET.FileUpload fileUpload = new DEXTUpload.NET.FileUpload())
{
fileUpload.MaxFileLength = 5242880;
if (fileUpload["file1"].FileLength > fileUpload.MaxFileLength)
{
Response.Write("File size must be less than 5MBytes.<br>");
Response.Write("Press the back button on your browser...<br>");
}
else
{
fileUpload["file1"].Save();
}
}
}
… |
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| 3. Setting the Upload Timeout |
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Since
the working process such as file upload or Save takes a long time in case of
uploading mass storage file if the value of Server.ScriptTimeout(Default:
90sec) and Session.Timeout(Default: 20min) is not changed, upload process is
not executed due to Timeout error.
By providing UploadTimeout property, DEXTUpload can upload mass storage file
without Timeout error. You don’t have to set Session Timeout of
Server.ScriptTimeout,
The default value is 3600sec(60min) and may be used by modifying value
according to the necessity .
[Form_Process.aspx.cs]
…
private void Page_Load(object sender, System.EventArgs e)
{
using (DEXTUpload.NET.FileUpload fileUpload = new DEXTUpload.NET.FileUpload())
{
fileUpload.UploadTimeout = 1800;
fileUpload[“file1”].Save();
}
}
…
In the example above, since the value of UploadTimeout is set as
1800sec(30min), Time error may not occurred if Save process is not exceeded
1800sec. |
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| 4. Limiting Upload file type |
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By
using Mime Type property provided by DEXTUpload, the uploadable file type can
be limited.
the following type example can be uploaded by using GIF and JPG file only.
[Form_Process.aspx.cs]
…
private void Page_Load(object sender, System.EventArgs e)
{
using (DEXTUpload.NET.FileUpload fileUpload = new DEXTUpload.NET.FileUpload())
{
string mimetype = fileUpload["file1"].MimeType
if (mimetype=="image/gif" || mimetype=="image/pjpeg")
fileUpload["file1"].Save();
else
Response.Write("Your file must be GIF or JPG...<br>");
}
}
… |
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| 5. Canceling upload process with out saving file |
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By
using Flush method provided by DEXTUpload, you can cancel upload progress and
execute the remained code continuously without saving file into server if
necessary .
The following is the example that shows error message by canceling upload in
case when upload file
capacity is exceeded during file uploading.
[Form_Proc.aspx.cs]
…
private void Page_Load(object sender, System.EventArgs e)
{
using (DEXTUpload.NET.FileUpload fileUpload = new DEXTUpload.NET.FileUpload())
{
if (Request.TotalBytes > 1048576)
{
fileUpload.Flush();
Response.Write("Warning: File size must be less than 1 MBytes.");
}
else
{
fileUpload.Save();
Response.Write("File-upload completed.");
}
}
}
… |
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| Using
Progress Indicator of Server Upload |
| 1. Using Progress Indicator of Server Upload |
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By
using Server-side Graphical Progress Indicator, you can see the file upload
progress and monitor upload
speed, total contents size and the present uploaded contents size, the remained
time, present progress
information without downloading additional Client Side softwares such as
ActiveX Control or Java Applet.
[ Form preparation page (GPIUpload.aspx) ]
<%@ Page … %>
<HTML>
<HEAD>
<SCRIPT LANGUAGE="JavaScript">
<!--
function ShowProgress()
{
strAppVersion = navigator.appVersion;
if (document.write_form.file1.value != "")
{
ProgressID = (new Date()).getTime() % 1000000;
if (ProgressID==0) ProgressID = 1000000;
if (strAppVersion.indexOf('MSIE') != -1 &&
strAppVersion.substr(strAppVersion.indexOf('MSIE')+5,1) > 4) {
winstyle = "dialogWidth=385px; dialogHeight:150px; center:yes";
window.showModelessDialog("../Progress/show_progress_IE.aspx?ProgressID="+ProgressID,
null, winstyle);
}
else
{
winpos = "left=" + ((window.screen.width-380)/2)
+",top="+((window.screen.height-110)/2);
winstyle="width=380,height=110,status=no,toolbar=no,menubar=no,location=no,resizable=no,
scrollbars=no,copyhistory=no," + winpos;
window.open("../Progress/show_progress_NN.aspx?ProgressID="+ProgressID,null,winstyle);
}
document.write_form.action = " form_process.aspx?ProgressID=" + ProgressID;
}
return true;
}
//-->
</SCRIPT>
</HEAD>
<BODY>
<FORM NAME= "writeform" METHOD=
"post"ACTION="form_process.aspx?ProgressID=0"
ENCTYPE="multipart/form-data" onSubmit="return ShowProgress();">
<INPUT TYPE="file" NAME="file1"><BR>
<INPUT TYPE="submit" VALUE="upload">
</FORM>
</BODY>
</HTML>
In order to use Progress Indicator, you should add Java script such
as ShowProgress() like
the example above. And in order to show Progress Indicator by calling
ShowProgress() function
before submitting form, the new window(or dilaog box) is occurred .
At this time, the page shown in the new window is as following .
[ Page that shows Progress Indicator for
Internet Explorer (show_progress_IE.aspx) ]
<%@ Page EnableSessionState="false" … %>
<html>
<head>
<title>Uploading Files...</title>
<STYLE type="text/css">
td {font-size: 9pt}
</STYLE>
</head>
<body MS_POSITIONING="GridLayout" bgcolor=#d4d0c8 leftmargin=8 topmargin=0
scroll=
no><BR><IFRAMEsrc="show_prog_body.aspx?ProgressID=<%Response.Write(Request.QueryString["ProgressID"]);%>"
title="Progress Step1" frameborder=0 marginheight=0 marginwidth=0 noresize
scrolling=no
width=365 height=65>
</IFRAME>
<br><br>
<table border=0 width=365 cellpadding=2 cellspacing=0 bgcolor=#d4d0c8>
<tr><td>Click the <b>STOP</b> button on your browser to
abort uploading.</td></tr>
</table>
</body>
</html>
[ page that shows Progress Indicator for Netscape Navigator
(show_progress_NN.aspx)]
<%@ Page EnableSessionState="false" … %>
<frameset rows="80,1*" border="0" framespacing="0" frameborder=
"NO"><BR><framesrc="show_prog_body.aspx?ProgressID=<%Response.Write(Request.QueryString["ProgressID"]);%>"
noresize scrolling="NO" frameborder="NO" name="sp_body">
<frame src="show_prog_bottom.aspx" noresize scrolling="NO" frameborder="NO"
name="sp_bottom">
</frameset>
In order to show Progress Indicator, in addition
to“show_progress.asp” above, the next “show_prog_body.asp”
and “show_prog_bottom.asp” are needed
1) show_progress.asp: Progress Indicator in oder to show it , web page should
be divided by frame.
2) show_prog_body.asp: really shows Progress Indicator.
3) show_prog_bottom.asp: ( Like Netscape Navigator, the browser that does not
support Inline Frame, is needed)
[ page that shows Progress Indicator
(show_prog_body.aspx) ]
<%@ Page EnableSessionState="false" … %>
[ page that shows Progress Indicator (show_prog_body.aspx.cs) ]
private void Page_Load(object sender, System.EventArgs e)
{
using (DEXTUpload.NET.FileUploadMonitor monitor = new
DEXTUpload.NET.FileUploadMonitor())
{
monitor.ShowMonitor();
}
}
[ page that shows Progress Indicator (show_prog_bottom.aspx)]
<%@ Page EnableSessionState="false" … %>
<HTML>
<HEAD>
<title>show_prog_bottom</title>
<STYLE type="text/css">
td {font-size: 9pt}
</STYLE>
</HEAD>
<body MS_POSITIONING="GridLayout" bgcolor="#d4d0c8" leftmargin="8"
topmargin="0" scroll="no">
<table border="0" width="365" cellpadding="0" cellspacing="0"
bgcolor="#d4d0c8">
<tr><td>Click the <b>STOP</b> button on your browser to
abort uploading.</td></tr>
</table>
</body>
</HTML>
If you see ASP page above, you can check that "EnableSessionState" property is
set as False, and session
situation is canceled. If session situation of this page is not canceled, since
you can not see the page result executed by the time of completing file upload,
that is the submission of Form, be sure to cancel the
session situation of page.. ShowMonitor Method shows upload progress in each
time. And in case of
completing upload, window (or dialog box is automatically closed.
[ page that handles upload progress
(form_process.aspx.cs) ]
…
private void Page_Load(object sender, System.EventArgs e)
{
using (DEXTUpload.NET.FileUpload fileUpload = new DEXTUpload.NET.FileUpload())
{
fileUpload[“file1”].Save();
}
}
…
The page that handles upload progress should be written equally with disregard
to use of Progress
Indicator. |
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| File
Download |
| 1. File Download |
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In
Download, DownloadVirtual Method of FileDownload object, users can download
file in the server from
web browser.
Download : downloads file existed in the designated path of server.
DownloadVirtual : downloads files existed in the designated virtual path of
server.
[Download.aspx.cs]
…
private void Page_Load(object sender, System.EventArgs e)
{
Response.Buffer = false;
string ContentDisposition = "";
string ContentType = "";
if (Request.UserAgent.IndexOf("MSIE") >= 0)
{
//In case of IE 5.0
if (Request.UserAgent.IndexOf("MSIE 5.0") >= 0)
{
ContentDisposition = "inline;filename=";
ContentType = "application/x-msdownload";
}
//In case of not IE 5.0
else
{
ContentDisposition = "inline;filename=";
ContentType = "application/unknown";
}
}
else
{
//In case of other browser such as Netscape etc.
ContentDisposition = "attachment;filename=";
ContentType = "application/unknown";
}
string FileName = Request.QueryString["filename"];
string FilePath = Request.QueryString["filepath"];
using (DEXTUpload.NET.FileDownload fileDownload = new
DEXTUpload.NET.FileDownload())
{
Response.AddHeader("Content-Disposition", ContentDisposition + FileName);
System.IO.FileInfo fInfo = new System.IO.FileInfo(FilePath);
Response.AddHeader("Content-Length", fInfo.Length.ToString());
fInfo = null;
Response.ContentType = ContentType;
Response.CacheControl = "public";
fileDownload.Download(FilePath);
}
}
…
If the ASP page above is executed with the total path of file to be downloaded
, the related file can be
donloaded. If you see the upper part of page, you can check that file can be
downloaded by designating
as Response.Buffer = False without buffering. Download method is called after
designating the head
information such as Content- Disposition, Content-Length, ContentType etc.
Users can download file by
designating the file name and path to be downloaded in the dialog box of web
browser. |
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| 2. Database BLOB data Download |
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In
DownloadBlob Method of FileDownload object, you can download database BLOB in
the server from web browser to disk file of users. Except the Database-related
part, it is identical to Download Method.
[ DownloadBlob.asp ]
…
private void Page_Load(object sender, System.EventArgs e)
{
Response.Buffer = true;
string ContentDisposition = "";
string ContentType = "";
if (Request.UserAgent.IndexOf("MSIE") >= 0)
{
//In case of IE 5.0
if (Request.UserAgent.IndexOf("MSIE 5.0") >= 0)
{
ContentDisposition = "inline;filename=";
ContentType = "application/x-msdownload";
}
//In case of not IE 5.0
else
{
ContentDisposition = "inline;filename=";
ContentType = "application/unknown";
}
}
else
{
//In case of other browser such as Netscape etc.
ContentDisposition = "attachment;filename=";
ContentType = "application/unknown";
}
string FileID = Request.QueryString["fileid"];
string ConnectionString = "…”;
OleDbConnection cn = new OleDbConnection(ConnectionString);
cn.Open();
string strQuery = "SELECT filename, filesize, filedata FROM DEXTUPLOAD WHERE
fileid = " + FileID;
OleDbCommand cmd = new OleDbCommand(strQuery, cn);
OleDbDataReader dataReader =
cmd.ExecuteReader(CommandBehavior.SequentialAccess);
if (dataReader.Read())
{
string FileName = dataReader.GetString(0);
int FileSize = dataReader.GetInt32(1);
using (DEXTUpload.NET.FileDownload fileDownload = new
DEXTUpload.NET.FileDownload())
{
Response.AddHeader("Content-Disposition", ContentDisposition + FileName);
Response.AddHeader("Content-Length", FileSize.ToString());
Response.ContentType = ContentType;
Response.CacheControl = "public";
fileDownload.DownloadBlob(dataReader, 2);
}
}
}
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