使用WebBrowser到剪切板保存图片始终失败，大伙来看看

[jvhmr]

总共6台机器,4台正常，2台始终失败，Clipboard.ContainsImage()始终未false，很怪，大伙有遇到过吗？

 HtmlDocument doc = this.CurrentMyBroswer.Document;
            mshtml.HTMLDocument html = (HTMLDocument)this.CurrentMyBroswer.Document.DomDocument;

            HtmlElement im = MyWebBrowser.GetElementByOuthtml(doc, "img", "logo.png");
            IHTMLControlElement img_2 = im.DomElement as IHTMLControlElement;

            IHTMLControlRange range = (IHTMLControlRange)((HTMLBody)html.body).createControlRange();
            range.add(img_2);
            range.execCommand("Copy", false, null);

            range = null;
            html = null;


            if (Clipboard.ContainsImage())
            {
                using (Image img1 = Clipboard.GetImage())
                {
                    
                    string imgfile = string.Format(@"{0}\{1}.png", Application.StartupPath, DateTime.Now.ToString("yyyyMMddHHmmssfff"));
                    img1.Save(imgfile);//保存图片到磁盘
                    ShowMessage("img ok");
                }
            }
            else
            {
                // 获取失败，
                ShowMessage("img err");
                return;
            }

[jvhmr]

自己up一下

[非专业开发Five]

管理员权限？ 按道理剪贴板是不需要的，但是真说不准

[jvhmr]

引用 2 楼 xomix 的回复:

管理员权限？ 按道理剪贴板是不需要的，但是真说不准

使用管理员启动的win form项目

[非专业开发Five]

你这个涉及的东西比较多，因此你需要先从剪贴板入手，先看直接访问剪贴板有没有问题，然后看js这边执行有没有问题。观察不同电脑的ie版本等等……你分开来一点一点调试吧。

[desperaso]

是要把webbrows转图像么？

class NativeMethods
 {
 [ComImport]
 [Guid("0000010D-0000-0000-C000-000000000046")]
 [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
 interface IViewObject
 {
 void Draw([MarshalAs(UnmanagedType.U4)] uint dwAspect, int lindex, IntPtr pvAspect, [In] IntPtr ptd, IntPtr hdcTargetDev, IntPtr hdcDraw, [MarshalAs(UnmanagedType.Struct)] ref RECT lprcBounds, [In] IntPtr lprcWBounds, IntPtr pfnContinue, [MarshalAs(UnmanagedType.U4)] uint dwContinue);
 }

[StructLayout(LayoutKind.Sequential, Pack = 4)]
 struct RECT
 {
 public int Left;
 public int Top;
 public int Right;
 public int Bottom;
 }

public static void GetImage(object obj, Image destination, Color backgroundColor)
 {
 using (Graphics graphics = Graphics.FromImage(destination))
 {
 IntPtr deviceContextHandle = IntPtr.Zero;
 RECT rectangle = new RECT();

rectangle.Right = destination.Width;
 rectangle.Bottom = destination.Height;

graphics.Clear(backgroundColor);

try
 {
 deviceContextHandle = graphics.GetHdc();

IViewObject viewObject = obj as IViewObject;
 viewObject.Draw(1, -1, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, deviceContextHandle, ref rectangle, IntPtr.Zero, IntPtr.Zero, 0);
 }
 finally
 {
 if (deviceContextHandle != IntPtr.Zero)
 {
 graphics.ReleaseHdc(deviceContextHandle);
 }
 }
 }
 }
 }

 

private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
 {

Bitmap screenshot = new Bitmap(webBrowser1.Width, webBrowser1.Height);
 NativeMethods.GetImage(webBrowser1.ActiveXInstance, screenshot, Color.White);

// 保存图片
screenshot.Save(@"F:\h11.png");
 }

[c02645]

获取img的src,使用WebClient下载，这样不是更简单，不用考虑浏览器支持js的copy问题。 webClient.DownloadFile(url, newName);