我想要做的是捕捉一张图片并将其保存在服务器端。到目前为止,该图片仅被保存在客户端。
<script>
html2canvas(document.querySelector("body")).then(canvas => {
var img = canvas.toDataURL("image/png")
var img = canvas.toDataURL("image/png").replace("image/png", "image/octet-stream");
///location.href = img;
$.ajax({
type: 'POST',
url: "UserHome/UploadImage",
data: '{ "imageData" : "' + img + '" }',
contentType: 'application/json; charset=utf-8',
dataType: 'json',
success: function (msg) {
alert('Image saved successfully !');
}
});
</script>
UserHomeController:
static string path = @"E:\XXXXX\XXXXXXX\";
[WebMethod()]
public static void UploadImage(string imageData)
{
string fileNameWitPath = path + DateTime.Now.ToString().Replace("/", "-").Replace(" ", "- ").Replace(":", "") + ".png";
using (FileStream fs = new FileStream(fileNameWitPath, FileMode.Create))
{
using (BinaryWriter bw = new BinaryWriter(fs))
{
byte[] data = Convert.FromBase64String(imageData);//convert from base64
bw.Write(data);
bw.Close();
}
}
}
我按照这个教程进行操作:http://www.dotnetfunda.com/articles/show/1662/saving-html-5-canvas-as-image-on-the-server-using-aspnet。
为什么它没有在页面加载完成后立即保存图片?尽管,如果我取消注释以下行并删除ajax,它会在另一个选项卡中显示图像:
///location.href = img;
此外,我想知道是否有可能在浏览器最小化的情况下捕获屏幕?或者有没有其他方法可以完成此操作?
更新:
我已经成功将截图保存到服务器端,但问题仍然存在:当浏览器最小化时,如何捕获屏幕?我运行脚本并将浏览器最小化,但它仍然捕获浏览器图像并将其保存到服务器文件夹中。现在有没有办法捕获浏览器之外的屏幕图像?