I have the following web service that allows me uploading files:
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.ComponentModel.ToolboxItem(false)]
// Pour autoriser l'appel de ce service Web depuis un script à l'aide d'ASP.NET AJAX, supprimez les marques de commentaire de la ligne suivante.
[System.Web.Script.Services.ScriptService]
public class Upload : System.Web.Services.WebService
{
[WebMethod]
public bool UploadFile(string PictureName, byte[] PictureStream)
{
FileStream fileStream = null;
BinaryWriter writer = null;
string filePath;
try
{
filePath = HttpContext.Current.Server.MapPath(".") + ConfigurationManager.AppSettings["PictureUploadDirectory"] + PictureName;
if (PictureName != string.Empty)
{
fileStream = File.Open(filePath, FileMode.Create);
writer = new BinaryWriter(fileStream);
writer.Write(PictureStream);
}
return true;
}
catch (Exception)
{
return false;
}
finally
{
if (fileStream != null)
fileStream.Close();
if (writer != null)
writer.Close();
}
}
}
It works great when it gets invoked from my Windows form.
Now, I’m trying to make it work with HTML/JavaScript. The index.html file is put on the server side (to avoid the cross-domain error) and contains the following code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.8/themes/base/jquery-ui.css" type="text/css" media="all" />
<link rel="stylesheet" href="http://static.jquery.com/ui/css/demo-docs-theme/ui.theme.css" type="text/css" media="all" />
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js" type="text/javascript"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.8/jquery-ui.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function () {
$("#btnSend").click(function () {
var fileStream = $("#fileToSend").val();
$.ajax({
type: "POST",
data: { PictureName: 'foobar', PictureStream: fileStream },
dataType: "image/gif",
url: "http://localhost/WebServices/Upload.asmx/UploadFile",
contentType: "application/x-www-form-urlencoded",
success: function () {
alert('yes');
},
error: function () {
alert('bouh');
}
});
});
});
</script>
</head>
<body>
<input type="file" id="fileToSend"/>
<br />
<input type="button" value="Envoyer" id="btnSend"/>
</body>
</html>
When I try to upload a file, I get the following response from the server:
System.ArgumentException: Unable to convert C:\fakepath\logo.gif into System.Byte.
How can I avoid this error?
Thanks, regards.
You can’t upload a file with Ajax. You can use an iframe which simulates a similiar effect, but you still have to sumbit the form. (by
$("form").submit();or clicking the submit button)