1
我想從C＃中的瀏覽器控件獲取屏幕截圖。當我試圖初始化瀏覽器控件，我得到一個錯誤：線程和位圖方法c＃
ActiveX control '8856f961-340a-11d0-a96b-00c04fd705a2' cannot be instantiated because the current thread is not in a single-threaded apartment.
現在我想做的是，我創建一個線程，我所做的一切initizalization那裏，但我得到一個錯誤當我試圖聲明Response.ContentType = "image/jpeg"; 的錯誤信息是：
Response is not available in this context.
這裏是我的完整代碼：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using System.Net;
using System.Text.RegularExpressions;
using System.Drawing;
using System.Threading;
using System.Drawing.Imaging;
using System.Text;
using System.Windows.Forms;
public partial class _Default : System.Web.UI.Page
{
string currentPageUrl = "";
Bitmap bmp = new Bitmap(1024, 768);
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
if (Request.ServerVariables["HTTPS"].ToString() == "")
{
currentPageUrl = Request.ServerVariables["SERVER_PROTOCOL"].ToString().ToLower().Substring(0, 4).ToString() + "://" + Request.ServerVariables["SERVER_NAME"].ToString() + ":" + Request.ServerVariables["SERVER_PORT"].ToString() + Request.ServerVariables["SCRIPT_NAME"].ToString();
}
else
{
currentPageUrl = Request.ServerVariables["SERVER_PROTOCOL"].ToString().ToLower().Substring(0, 5).ToString() + "://" + Request.ServerVariables["SERVER_NAME"].ToString() + ":" + Request.ServerVariables["SERVER_PORT"].ToString() + Request.ServerVariables["SCRIPT_NAME"].ToString();
}
Thread thr = new Thread(new ThreadStart(OptimizeWebBrowserAndCreateImage));
thr.SetApartmentState(ApartmentState.STA);
thr.Start();
}
protected void OptimizeWebBrowserAndCreateImage()
{
System.Windows.Forms.WebBrowser browser = new System.Windows.Forms.WebBrowser();
browser.ScrollBarsEnabled = false;
browser.ScriptErrorsSuppressed = true;
browser.Navigate(currentPageUrl);
while (browser.ReadyState != WebBrowserReadyState.Complete)
System.Windows.Forms.Application.DoEvents();
System.Threading.Thread.Sleep(1500);
int width = browser.Document.Body.ScrollRectangle.Width;
int height = browser.Document.Body.ScrollRectangle.Height;
browser.Width = width;
browser.Height = height;
System.Drawing.Bitmap bmp = new Bitmap(width, height);
browser.DrawToBitmap(bmp, new System.Drawing.Rectangle(0, 0, width, height));
Response.ContentType = "image/jpeg";
Response.AppendHeader("Content-Disposition", "attachment; filename=screenshot.jpg");
bmp.Save(Response.OutputStream, ImageFormat.Jpeg);
bmp.Dispose();
bmp.Dispose();
Response.End();
}
}
我正在一個錯誤，正如我所說Response.ContentType = "image/jpeg";
我感謝您的幫助，我希望有人能幫我解決這個問題。 由於提前，Laziale
Updated Version based on Henk's advice:using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using System.Net;
using System.Text.RegularExpressions;
using System.Drawing;
using System.Threading;
using System.Drawing.Imaging;
using System.Text;
using System.Windows.Forms;
public partial class _Default : System.Web.UI.Page
{
string currentPageUrl = "";
Bitmap bmp = new Bitmap(1024, 768);
Thread thr = null;
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
if (Request.ServerVariables["HTTPS"].ToString() == "")
{
currentPageUrl = Request.ServerVariables["SERVER_PROTOCOL"].ToString().ToLower().Substring(0, 4).ToString() + "://" + Request.ServerVariables["SERVER_NAME"].ToString() + ":" + Request.ServerVariables["SERVER_PORT"].ToString() + Request.ServerVariables["SCRIPT_NAME"].ToString();
}
else
{
currentPageUrl = Request.ServerVariables["SERVER_PROTOCOL"].ToString().ToLower().Substring(0, 5).ToString() + "://" + Request.ServerVariables["SERVER_NAME"].ToString() + ":" + Request.ServerVariables["SERVER_PORT"].ToString() + Request.ServerVariables["SCRIPT_NAME"].ToString();
}
thr = new Thread(new ThreadStart(OptimizeWebBrowserAndCreateImage));
thr.SetApartmentState(ApartmentState.STA);
thr.Start();
}
protected void OptimizeWebBrowserAndCreateImage()
{
/*
Bitmap bitmap = new Bitmap(CaptureWebPage2(currentPageUrl));
Response.ContentType = "image/jpeg";
Response.AppendHeader("Content-Disposition", "attachment; filename=screenshot.jpg");
bitmap.Save(Response.OutputStream, ImageFormat.Jpeg);
bitmap.Dispose();
bitmap.Dispose();
Response.End();
*/
System.Windows.Forms.WebBrowser browser = new System.Windows.Forms.WebBrowser();
browser.ScrollBarsEnabled = false;
browser.ScriptErrorsSuppressed = true;
browser.Navigate(currentPageUrl);
while (browser.ReadyState != WebBrowserReadyState.Complete)
System.Windows.Forms.Application.DoEvents();
System.Threading.Thread.Sleep(1500);
int width = browser.Document.Body.ScrollRectangle.Width;
int height = browser.Document.Body.ScrollRectangle.Height;
browser.Width = width;
browser.Height = height;
System.Drawing.Bitmap bmp = new Bitmap(width, height);
browser.DrawToBitmap(bmp, new System.Drawing.Rectangle(0, 0, width, height));
/* Response.ContentType = "image/jpeg";
Response.AppendHeader("Content-Disposition", "attachment; filename=screenshot.jpg");
bmp.Save(Response.OutputStream, ImageFormat.Jpeg);
bmp.Dispose();
bmp.Dispose();
Response.End();
*/
}
protected void Page_PreRender(object sender, EventArgs e)
{
if (thr != null)
{
thr.Join();
Response.ContentType = "image/jpeg";
Response.AppendHeader("Content-Disposition", "attachment; filename=screenshot.jpg");
bmp.Save(Response.OutputStream, ImageFormat.Jpeg);
bmp.Dispose();
//bmp.Dispose();
Response.End();
}
}
}
嘿亞歷克斯，感謝您的評論。然而，線程似乎很好，問題在於響應。當我不使用任何線程時，響應沒有任何問題。 – Laziale
@Russ C如果你的意思是我的page_load事件，不，它沒有裝飾。它雖然是asp.net（c＃）頁面。感謝您的幫助 – Laziale
好點，好工作，但它是一個即興的：D –