网页快照 - C#实现
/// <summary>
/// 图片类型枚举
/// </summary>
public enum ImageType
{
GIF = ,
JPG = ,
PNG =
} /// <summary>
/// 图片辅助类
/// </summary>
public class ImageHelper
{
/// <summary>
/// 将Url地址保存为图片
/// </summary>
/// <param name="url">网页路径</param>
/// <param name="savePath">图片存放路径</param>
/// <param name="imageType">图片类型</param>
/// <returns></returns>
public static string SaveUrlToImage(string url, string savePath, ImageType imageType)
{
var uri = new Uri(url);
using (var bit = GetHtmlImage(uri, Screen.PrimaryScreen.Bounds.Width))
{
switch (imageType)
{
case ImageType.GIF:
bit.Save(savePath, ImageFormat.Gif);
break;
case ImageType.JPG:
bit.Save(savePath, ImageFormat.Jpeg);
break;
case ImageType.PNG:
bit.Save(savePath, ImageFormat.Png);
break;
default:
bit.Save(savePath, ImageFormat.Jpeg);
break;
}
return savePath;
}
} protected static Bitmap GetHtmlImage(Uri urlString, int width)
{
using (var control = new WebBrowser { Size = new Size(width, ), Url = urlString, ScriptErrorsSuppressed = true })
{
while (control.ReadyState != WebBrowserReadyState.Complete)
{
Application.DoEvents();
}
if (control.Document != null)
{
if (control.Document.Body != null)
{
control.Height = control.Document.Body.ScrollRectangle.Height + ;
}
}
control.Url = urlString;
var snap = new WebControlImage.Snapshot();
var bitmap = snap.TakeSnapshot(control.ActiveXInstance, new Rectangle(, , control.Width, control.Height));
control.Dispose();
return bitmap;
}
} /// WebBrowser获取图形
protected class WebControlImage
{
internal static class NativeMethods
{
[StructLayout(LayoutKind.Sequential)]
public sealed class TagDvtargetdevice
{
[MarshalAs(UnmanagedType.U4)]
public int tdSize;
[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)
{
left = r.X;
top = r.Y;
right = r.Right;
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 Comrect FromXywh(int x, int y, int width, int height)
{
return new Comrect(x, y, x + width, y + height);
} public override string ToString()
{
return string.Concat("Left = ", left, " Top ", top, " Right = ", right, " Bottom = ", bottom);
}
} [StructLayout(LayoutKind.Sequential)]
public sealed class TagLogpalette
{
[MarshalAs(UnmanagedType.U2)]
public short palVersion;
[MarshalAs(UnmanagedType.U2)]
public short palNumEntries;
}
} public class Snapshot
{
/// 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
IntPtr viewObject;
//内存图
var bitmap = new Bitmap(bmpRect.Width, bmpRect.Height);
var image = Graphics.FromImage(bitmap);
//获取接口
object hret = Marshal.QueryInterface(Marshal.GetIUnknownForObject(pUnknown), ref UnsafeNativeMethods.IidIViewObject, out viewObject);
try
{
var o = (UnsafeNativeMethods.IViewObject)Marshal.GetTypedObjectForIUnknown(viewObject, typeof(UnsafeNativeMethods.IViewObject));
//调用Draw方法
if (o != null)
{
o.Draw((int)DVASPECT.DVASPECT_CONTENT, -, IntPtr.Zero, null, IntPtr.Zero, image.GetHdc(), new NativeMethods.Comrect(bmpRect), null, IntPtr.Zero, );
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
throw;
}
//释放
image.Dispose();
return bitmap;
}
} [SuppressUnmanagedCodeSecurity]
internal static class UnsafeNativeMethods
{
public static Guid IidIViewObject = 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);
}
}
}
}
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