我正在尝试实现我在网上找到的一段代码，以便在html5画布上上传一些图纸，以便我可以将图像附加到电子邮件中 .
<script type="text/javascript">
// Send the canvas image to the server.
$(document).ready(function () {
$('#btnSave').live('click', function () {
var image = document.getElementById("tools_sketch").toDataURL();
image = image.replace('data:image/png;base64,', '');
$.ajax({
type: 'POST',
url: 'upload.aspx/UploadImage',
data: '{ "imageData" : "' + image + '" }',
contentType: 'application/json; charset=utf-8',
dataType: 'json',
success: function (msg) {
alert('Image sent!');
},
error: function (msg2) {
alert('Image problem!' + msg2.toString());
}
});
});
});
</script>
upload.aspx
<%@ Page Language="VB" AutoEventWireup="true" CodeFile="upload.aspx.vb" Inherits="CanvasToServer._upload" %>
upload.aspx.vb
Imports System.IO命名空间CanvasToServer Partial Class _upload Inherits System.Web.UI.Page Public Shared Sub UploadImage（ByVal imageData As String）
Dim fs As New FileStream("C:\uploaded\image.png", FileMode.Create)
Dim bw As New BinaryWriter(fs)
Dim data As Byte() = Convert.FromBase64String(imageData)
bw.Write(data)
bw.Close()
End Sub
End Class
结束命名空间
该行导致编译错误“属性说明符不是完整的语句 . 使用行继续将该属性应用于以下语句 . ”如果我删除该行代码编译但画布图像仍然没有上传到服务器 . 我在localhost上运行此代码，并且我的机器上存在文件夹c：\ uploaded .