今天无意见看到浏览器有将网页生成图片的功能，顿时赶脚很好奇，于是就找了找资料自己做了一个类似的功能。
工具截图：生成后的图片
手动填写网站地址，可选择图片类型和保持图片地址，来生成页面的图片，当图片路径未选择时则保存桌面；
具体代码如下：
将html生成图片的类
1 using System; 2 using System.Collections.Generic; 3 using System.ComponentModel; 4 using System.Data; 5 using System.Drawing; 6 using System.Text; 7 using System.Windows.Forms; 8 using System.Drawing.Imaging; 9 using System.Runtime.InteropServices; 10 using System.Security; 11 namespace Print 12 { 13 public class Test 14 { 15 public static Bitmap GetHtmlImage(Uri UrlString, int Width) 16 { 17 WebBrowser MyControl = new WebBrowser(); 18 MyControl.Size = new Size(Width, 10); 19 MyControl.Url = UrlString; 20 while (MyControl.ReadyState != WebBrowserReadyState.Complete) 21 { 22 Application.DoEvents(); 23 } 24 MyControl.Height = MyControl.Document.Body.ScrollRectangle.Height + 20; 25 MyControl.Url = UrlString; 26 WebControlImage.Snapshot snap = new WebControlImage.Snapshot(); 27 Bitmap MyImage = snap.TakeSnapshot(MyControl.ActiveXInstance, new Rectangle(0, 0, MyControl.Width, MyControl.Height)); 28 MyControl.Dispose(); 29 return MyImage; 30 } 31 /// 32 /// WebBrowser获取图形 33 /// 34 private class WebControlImage 35 { 36 internal static class NativeMethods 37 { 38 [StructLayout(LayoutKind.Sequential)] 39 public sealed class tagDVTARGETDEVICE 40 { 41 [MarshalAs(UnmanagedType.U4)] 42 public int tdSize; 43 [MarshalAs(UnmanagedType.U2)] 44 public short tdDriverNameOffset; 45 [MarshalAs(UnmanagedType.U2)] 46 public short tdDeviceNameOffset; 47 [MarshalAs(UnmanagedType.U2)] 48 public short tdPortNameOffset; 49 [MarshalAs(UnmanagedType.U2)] 50 public short tdExtDevmodeOffset; 51 } 52 [StructLayout(LayoutKind.Sequential)] 53 public class COMRECT 54 { 55 public int left; 56 public int top; 57 public int right; 58 public int bottom; 59 public COMRECT() 60 { 61 } 62 public COMRECT(Rectangle r) 63 { 64 this.left = r.X; 65 this.top = r.Y; 66 this.right = r.Right; 67 this.bottom = r.Bottom; 68 } 69 public COMRECT(int left, int top, int right, int bottom) 70 { 71 this.left = left; 72 this.top = top; 73 this.right = right; 74 this.bottom = bottom; 75 } 76 public static NativeMethods.COMRECT FromXYWH(int x, int y, int width, int height) 77 { 78 return new NativeMethods.COMRECT(x, y, x + width, y + height); 79 } 80 public override string ToString() 81 { 82 return string.Concat(new object[] { "Left = ", this.left, " Top ", this.top, " Right = ", this.right, " Bottom = ", this.bottom }); 83 } 84 } 85 [StructLayout(LayoutKind.Sequential)] 86 public sealed class tagLOGPALETTE 87 { 88 [MarshalAs(UnmanagedType.U2)] 89 public short palVersion; 90 [MarshalAs(UnmanagedType.U2)] 91 public short palNumEntries; 92 } 93 } 94 public class Snapshot 95 { 96 /// 97 /// ?煺? 98 /// 99 /// Com 对象 100 /// 图象大小 101 /// 102 public Bitmap TakeSnapshot(object pUnknown, Rectangle bmpRect) 103 { 104 if (pUnknown == null) 105 return null; 106 //必须为com对象 107 if (!Marshal.IsComObject(pUnknown)) 108 return null; 109 //IViewObject 接口 110 UnsafeNativeMethods.IViewObject ViewObject = null; 111 IntPtr pViewObject = IntPtr.Zero; 112 //内存图 113 Bitmap pPicture = new Bitmap(bmpRect.Width, bmpRect.Height); 114 Graphics hDrawDC = Graphics.FromImage(pPicture); 115 //获取接口 116 object hret = Marshal.QueryInterface(Marshal.GetIUnknownForObject(pUnknown), 117 ref UnsafeNativeMethods.IID_IViewObject, out pViewObject); 118 try 119 { 120 ViewObject = Marshal.GetTypedObjectForIUnknown(pViewObject, typeof(UnsafeNativeMethods.IViewObject)) as UnsafeNativeMethods.IViewObject; 121 //调用Draw方法 122 ViewObject.Draw((int)System.Runtime.InteropServices.ComTypes.DVASPECT.DVASPECT_CONTENT, 123 -1, 124 IntPtr.Zero, 125 null, 126 IntPtr.Zero, 127 hDrawDC.GetHdc(), 128 new NativeMethods.COMRECT(bmpRect), 129 null, 130 IntPtr.Zero, 131 0); 132 } 133 catch (Exception ex) 134 { 135 Console.WriteLine(ex.Message); 136 throw ex; 137 } 138 //释放 139 hDrawDC.Dispose(); 140 return pPicture; 141 } 142 } 143 [SuppressUnmanagedCodeSecurity] 144 internal static class UnsafeNativeMethods 145 { 146 public static Guid IID_IViewObject = new Guid("{0000010d-0000-0000-C000-000000000046}"); 147 [ComImport, Guid("0000010d-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] 148 public interface IViewObject 149 { 150 [PreserveSig] 151 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); 152 [PreserveSig] 153 int GetColorSet([In, MarshalAs(UnmanagedType.U4)] int dwDrawAspect, int lindex, IntPtr pvAspect, [In] NativeMethods.tagDVTARGETDEVICE ptd, IntPtr hicTargetDev, [Out] NativeMethods.tagLOGPALETTE ppColorSet); 154 [PreserveSig] 155 int Freeze([In, MarshalAs(UnmanagedType.U4)] int dwDrawAspect, int lindex, IntPtr pvAspect, [Out] IntPtr pdwFreeze); 156 [PreserveSig] 157 int Unfreeze([In, MarshalAs(UnmanagedType.U4)] int dwFreeze); 158 void SetAdvise([In, MarshalAs(UnmanagedType.U4)] int aspects, [In, MarshalAs(UnmanagedType.U4)] int advf, [In, MarshalAs(UnmanagedType.Interface)] System.Runtime.InteropServices.ComTypes.IAdviseSink pAdvSink); 159 void GetAdvise([In, Out, MarshalAs(UnmanagedType.LPArray)] int[] paspects, [In, Out, MarshalAs(UnmanagedType.LPArray)] int[] advf, [In, Out, MarshalAs(UnmanagedType.LPArray)] System.Runtime.InteropServices.ComTypes.IAdviseSink[] pAdvSink); 160 } 161 } 162 } 163 } 164 }
winfrom后台处理方面代码如下
1 using System; 2 using System.Collections.Generic; 3 using System.ComponentModel; 4 using System.Data; 5 using System.Drawing; 6 using System.Linq; 7 using System.Text; 8 using System.Windows.Forms; 9 using System.Drawing.Imaging; 10 11 namespace Excel文件处理 12 { 13 public partial class Html : Form 14 { 15 public Html() 16 { 17 InitializeComponent(); 18 } 19 private string ImageUrl = "";//图片地址 20 private string ImageName = "";//图片名称 21 private void button1_Click(object sender, EventArgs e) 22 { 23 string HtmlUrl = this.Txt_Url.Text.Trim(); 24 if (HtmlUrl=="") 25 { 26 MessageBox.Show("请输入网址"); 27 return; 28 } 29 if (ImageUrl.Trim()=="") 30 { 31 ImageUrl = @"C:\Users\Administrator\Desktop"; 32 } 33 try 34 { 35 Uri ri = new Uri(this.Txt_Url.Text); 36 Bitmap bit = Print.Test.GetHtmlImage(ri, 1200); 37 ImageName = this.Txt_Name.Text.Trim();//图片名称 38 if (ImageName != "") 39 { 40 if (ImageName.IndexOf(‘.‘) != -1) 41 {//当用户输入图片后缀时，将后缀截取 42 ImageName.Substring(0, ImageName.LastIndexOf(‘.‘)); 43 } 44 } 45 else 46 ImageName = DateTime.Now.Ticks.ToString();//时间名称 47 switch (this.comboBox1.SelectedText) 48 { 49 case "GIF": ImageUrl += "\\" + ImageName + ".gif"; break; 50 case "JPG": ImageUrl += "\\" + ImageName + ".jpg"; break; 51 case "PNG": ImageUrl += "\\" + ImageName + ".png"; break; 52 default: ImageUrl += "\\" + ImageName + ".png"; break; 53 } 54 55 switch (this.comboBox1.SelectedText) 56 { 57 case "GIF": bit.Save(ImageUrl, ImageFormat.Gif); break; 58 case "JPG": bit.Save(ImageUrl, ImageFormat.Jpeg); break; 59 case "PNG": bit.Save(ImageUrl, ImageFormat.Png); break; 60 default: bit.Save(ImageUrl, ImageFormat.Png); break; 61 } 62 63 bit = null; 64 ImageUrl = "";//图片地址 65 ImageName = "";//图片名称 66 MessageBox.Show("生产成功"); 67 } 68 catch 69 { 70 MessageBox.Show("网址输入有误！"); 71 return; 72 } 73 74 } 75 76 private void button2_Click(object sender, EventArgs e) 77 { 78 //获取保存路径 79 if (this.folderBrowserDialog1.ShowDialog()==DialogResult.OK) 80 { 81 if (this.folderBrowserDialog1.SelectedPath.Trim()!="") 82 { 83 ImageUrl = folderBrowserDialog1.SelectedPath; 84 this.label6.Text = ImageUrl; 85 } 86 } 87 88 } 89 } 90 }