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Winform实现将网页生成图片的方法

2014-09-24 15:51 1161 查看

通常浏览器都有将网页生成图片的功能，本文实例讲述了Winform实现将网页生成图片的方法。分享给大家供大家参考。具体方法如下：

工具截图如下：

生成后的图片如下：

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

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
using System.Security;
namespace Print
{
public class Test
{
public static Bitmap GetHtmlImage(Uri UrlString, int Width)
{
WebBrowser MyControl = new WebBrowser();
MyControl.Size = new Size(Width, 10);
MyControl.Url = UrlString;
while (MyControl.ReadyState != WebBrowserReadyState.Complete)
{
Application.DoEvents();
}
MyControl.Height = MyControl.Document.Body.ScrollRectangle.Height + 20;
MyControl.Url = UrlString;
WebControlImage.Snapshot snap = new WebControlImage.Snapshot();
Bitmap MyImage = snap.TakeSnapshot(MyControl.ActiveXInstance, new Rectangle(0, 0, MyControl.Width, MyControl.Height));
MyControl.Dispose();
return MyImage;
}
///
/// WebBrowser获取图形
///
private 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)
{
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;
}
}
public class Snapshot
{
///
/// ?煺?
///
/// 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);
try
{
ViewObject = Marshal.GetTypedObjectForIUnknown(pViewObject, typeof(UnsafeNativeMethods.IViewObject)) as UnsafeNativeMethods.IViewObject;
//调用Draw方法
ViewObject.Draw((int)System.Runtime.InteropServices.ComTypes.DVASPECT.DVASPECT_CONTENT,
-1,
IntPtr.Zero,
null,
IntPtr.Zero,
hDrawDC.GetHdc(),
new NativeMethods.COMRECT(bmpRect),
null,
IntPtr.Zero,
0);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
throw ex;
}
//释放
hDrawDC.Dispose();
return pPicture;
}
}
[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)] System.Runtime.InteropServices.ComTypes.IAdviseSink pAdvSink);
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);
}
}
}
}
}

winfrom后台处理方面代码如下

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Imaging;
namespace Excel文件处理
{
public partial class Html : Form
{
public Html()
{
InitializeComponent();
}
private string ImageUrl = "";//图片地址
private string ImageName = "";//图片名称
private void button1_Click(object sender, EventArgs e)
{
string HtmlUrl = this.Txt_Url.Text.Trim();
if (HtmlUrl=="")
{
MessageBox.Show("请输入网址");
return;
}
if (ImageUrl.Trim()=="")
{
ImageUrl = @"C:\Users\Administrator\Desktop";
}
try
{
Uri ri = new Uri(this.Txt_Url.Text);
Bitmap bit = Print.Test.GetHtmlImage(ri, 1200);
ImageName = this.Txt_Name.Text.Trim();//图片名称
if (ImageName != "")
{
if (ImageName.IndexOf('.') != -1)
{//当用户输入图片后缀时，将后缀截取
ImageName.Substring(0, ImageName.LastIndexOf('.'));
}
}
else
ImageName = DateTime.Now.Ticks.ToString();//时间名称
switch (this.comboBox1.SelectedText)
{
case "GIF": ImageUrl += "\\" + ImageName + ".gif"; break;
case "JPG": ImageUrl += "\\" + ImageName + ".jpg"; break;
case "PNG": ImageUrl += "\\" + ImageName + ".png"; break;
default: ImageUrl += "\\" + ImageName + ".png"; break;
}
switch (this.comboBox1.SelectedText)
{
case "GIF": bit.Save(ImageUrl, ImageFormat.Gif); break;
case "JPG": bit.Save(ImageUrl, ImageFormat.Jpeg); break;
case "PNG": bit.Save(ImageUrl, ImageFormat.Png); break;
default: bit.Save(ImageUrl, ImageFormat.Png); break;
}
bit = null;
ImageUrl = "";//图片地址
ImageName = "";//图片名称
MessageBox.Show("生产成功");
}
catch
{
MessageBox.Show("网址输入有误！");
return;
}
}
private void button2_Click(object sender, EventArgs e)
{
//获取保存路径
if (this.folderBrowserDialog1.ShowDialog()==DialogResult.OK)
{
if (this.folderBrowserDialog1.SelectedPath.Trim()!="")
{
ImageUrl = folderBrowserDialog1.SelectedPath;
this.label6.Text = ImageUrl;
}
}
}
}
}

希望本文所述对大家的C#程序设计有所帮助。

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