function save(){
//base64
var dataUrl = canvas.toDataURL();
img.src = dataUrl;
sendAjaxText(dataUrl,"accept.htm","",false);
}
httprequest
……
Case "accept.htm"
dim str as stirng = e.PlainText.replace("data:image/png;base64,","")
Dim bs As Byte() = Convert.FromBase64String(str)
Dim stream As System.IO.Stream = New System.IO.MemoryStream(bs)
Dim bmp As System.Drawing.Bitmap = New System.Drawing.Bitmap(stream)
bmp.Save("c:\123.png")