[MarshalAs(UnmanagedType.U2)] public short tdDriverNameOffset; [MarshalAs(UnmanagedType.U2)] public short tdDeviceNameOffset; [MarshalAs(UnmanagedType.U2)] public short tdPortNameOffset; [MarshalAs(UnmanagedType.U2)] public short tdExtDevmodeOffset; [StructLayout(LayoutKind.Sequential)] public class COMRECT public int left; public int top; public int right; public int bottom; public COMRECT() public COMRECT(Rectangle r) this.left = r.X; this.top = r.Y; this.right = r.Right; this.bottom = r.Bottom; public COMRECT(int left, int top, int right, int bottom) this.left = left; this.top = top; this.right = right; this.bottom = bottom; public static NativeMethods.COMRECT FromXYWH(int x, int y, int width, int height) return new NativeMethods.COMRECT(x, y, x + width, y + height); public override string ToString() return string.Concat(new object[] { "Left = ", this.left, " Top ", this.top, " Right = ", this.right, " Bottom = ", this.bottom }); [StructLayout(LayoutKind.Sequential)] public sealed class tagLOGPALETTE [MarshalAs(UnmanagedType.U2)] public short palVersion; [MarshalAs(UnmanagedType.U2)] public short palNumEntries; UnsafeNativeMethods.cs: 程序代码using System; using System.Collections.Generic; using System.Text; using System.Security; using System.Runtime.InteropServices; using System.Runtime.InteropServices.ComTypes; namespace WindowsApplication1 ///

/// 从 .Net 2.0 的 System.Windows.Forms.Dll 库提取 ///

[SuppressUnmanagedCodeSecurity] internal static class UnsafeNativeMethods public static Guid IID_IViewObject = new Guid("{0000010d-0000-0000-C000-000000000046}"); [ComImport, Guid("0000010d-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IViewObject [PreserveSig] int Draw([In, MarshalAs(UnmanagedType.U4)] int dwDrawAspect, int lindex, IntPtr pvAspect, [In] NativeMethods.tagDVTARGETDEVICE ptd, IntPtr hdcTargetDev, IntPtr hdcDraw, [In] NativeMethods.COMRECT lprcBounds, [In] NativeMethods.COMRECT lprcWBounds, IntPtr pfnContinue, [In] int dwContinue); [PreserveSig] int GetColorSet([In, MarshalAs(UnmanagedType.U4)] int dwDrawAspect, int lindex, IntPtr pvAspect, [In] NativeMethods.tagDVTARGETDEVICE ptd, IntPtr hicTargetDev, [Out] NativeMethods.tagLOGPALETTE ppColorSet); [PreserveSig] int Freeze([In, MarshalAs(UnmanagedType.U4)] int dwDrawAspect, int lindex, IntPtr pvAspect, [Out] IntPtr pdwFreeze); [PreserveSig] int Unfreeze([In, MarshalAs(UnmanagedType.U4)] int dwFreeze); void SetAdvise([In, MarshalAs(UnmanagedType.U4)] int aspects, [In, MarshalAs(UnmanagedType.U4)] int advf, [In, MarshalAs(UnmanagedType.Interface)] IAdviseSink pAdvSink); void GetAdvise([In, Out, MarshalAs(UnmanagedType.LPArray)] int[] paspects, [In, Out, MarshalAs(UnmanagedType.LPArray)] int[] advf, [In, Out, MarshalAs(UnmanagedType.LPArray)] IAdviseSink[] pAdvSink); Snapshot.cs: 程序代码using System; using System.Collections.Generic; using System.Text; using System.Runtime.InteropServices; using System.Runtime.InteropServices.ComTypes; using System.Drawing; using System.Windows.Forms; namespace WindowsApplication1 ///

/// ActiveX 组件快照类 /// AcitveX 必须实现 IViewObject 接口 /// 作者:随飞 /// http://chinasf.cnblogs.com /// chinasf@hotmail.com ///

public class Snapshot ///

/// 取快照 ///

/// Com 对象 /// 图象大小 /// public Bitmap TakeSnapshot(object pUnknown, Rectangle bmpRect) if (pUnknown == null) return null; //必须为com对象 if (!Marshal.IsComObject(pUnknown)) return null; //IViewObject 接口 UnsafeNativeMethods.IViewObject ViewObject = null; IntPtr pViewObject = IntPtr.Zero; //内存图 Bitmap pPicture = new Bitmap(bmpRect.Width, bmpRect.Height); Graphics hDrawDC = Graphics.FromImage(pPicture); //获取接口 object hret = Marshal.QueryInterface(Marshal.GetIUnknownForObject(pUnknown), ref UnsafeNativeMethods.IID_IViewObject, out pViewObject); ViewObject = Marshal.GetTypedObjectForIUnknown(pViewObject, typeof(UnsafeNativeMethods.IViewObject)) as UnsafeNativeMethods.IViewObject; //调用Draw方法 ViewObject.Draw((int)DVASPECT.DVASPECT_CONTENT, IntPtr.Zero, null, IntPtr.Zero, hDrawDC.GetHdc(), new NativeMethods.COMRECT(bmpRect), null, IntPtr.Zero, Marshal.Release(pViewObject); catch (Exception ex) Console.WriteLine(ex.Message); throw ex; hDrawDC.Dispose(); return pPicture; 使用语法如下： 程序代码Snapshot snap = new Snapshot(); using (Bitmap bitmap = snap.TakeSnapshot(webBrowser.ActiveXInstance, new Rectangle(0, 0, picWidth, picHeight))) bitmap.Save(savepath, picType); 好了，修改下上次的WebCapture类： WebCapture.cs: 程序代码using System; using System.Drawing; using System.Drawing.Imaging; using System.Windows.Forms; using System.IO; namespace WindowsApplication1 public class WebCapture #region 字段、属性 private int width = 0; private int height = 0; private string url; private WebBrowser browser = new WebBrowser(); ///

/// 属性：图片宽 ///

public int Width { get { return width; } } ///

/// 属性：图片高 ///

public int Height { get { return height; } } ///

/// 属性：Url ///

public string Url { get { return url; } } #endregion #region 构造函数 ///

/// 构造函数 ///

public WebCapture() this.url = "http://www.mzwu.com/"; ///

/// 构造函数 ///

/// Url public WebCapture(string url) this.url = url; #endregion ///

/// 保存图片 ///

/// 保存路径 /// public void Save(string destpath) Save(this.url, destpath, this.width, this.height); ///

/// 保存图片 ///

/// Url /// 保存路径 /// public void Save(string url, string destpath) Save(url, destpath, this.width, this.height); ///

/// 保存图片 ///

/// Url /// 保存路径 /// 图片宽 /// 图片高 /// /// width,height为0时获取完整大小 public void Save(string url, string destpath, int width, int height) ImageFormat picType; //图片格式 switch (Path.GetExtension(destpath).ToLower()) case ".gif": picType = System.Drawing.Imaging.ImageFormat.Gif; break; case ".jpg": case ".jpeg": picType = System.Drawing.Imaging.ImageFormat.Jpeg; break; case ".png": picType = System.Drawing.Imaging.ImageFormat.Png; break; case ".bmp": picType = System.Drawing.Imaging.ImageFormat.Bmp; break; default: picType = System.Drawing.Imaging.ImageFormat.Jpeg; break; //抓取图片 InitComobject(url);//初始化窗体 int scrollWidth = this.browser.Document.Body.ScrollRectangle.Width; int scrollHeight = this.browser.Document.Body.ScrollRectangle.Height; this.browser.Width = scrollWidth; this.browser.Height = scrollHeight; if (width == 0) width = scrollWidth; if (height == 0) height = scrollHeight; //核心语句 Snapshot snap = new Snapshot(); using (Bitmap bitmap = snap.TakeSnapshot(this.browser.ActiveXInstance, new Rectangle(0, 0, width, height))) bitmap.Save(destpath, picType); browser.Dispose(); ///

/// 初始化 ///

/// protected void InitComobject(string url) this.browser.ScriptErrorsSuppressed = false; this.browser.ScrollBarsEnabled = false; this.browser.Navigate(url); //因为没有窗体，所以必须如此 while (this.browser.ReadyState != WebBrowserReadyState.Complete) System.Windows.Forms.Application.DoEvents(); this.browser.Stop(); if (this.browser.ActiveXInstance == null) throw new Exception("实例不能为空"); 使用示例： 程序代码new WebCapture().Save("http://www.531.hk/", @"C:/531.hk.jpg");
先定义三个重要的类NativeMethods、UnsafeNativeMethods和Snapshot：NativeMethods.cs: 程序代码using System;using System.Collections.Generic;using System.Text;using System.Runtime.InteropServices;using System.Drawing;namespace WindowsApplication1{ using Microsoft. Web . WebView 2.WinForms; private async void FMTEST_Load Async (object sender, EventArgs e) webView 21.Source = new Uri("https://blog.csdn.net/ccagy"); await webView 21.Ensu... Gets the height of the HTML content. 获取到的是 html 内容的高度，但是这个值的单位不是 px，而是 dp，所以不能直接拿来就用，需要先转换成 px，后面再说。 webview .getWidth()...