c# 實現(xiàn)網(wǎng)頁加載后將頁面截取為長圖片
更新時間：2021年01月13日 10:56:39 作者：UP技術(shù)控
這篇文章主要介紹了c# 實現(xiàn)網(wǎng)頁加載后將頁面截取為長圖片的方法，幫助大家更好的理解和學(xué)習(xí)c#，感興趣的朋友可以了解下
背景
最近再做一個需求，需要對網(wǎng)頁生成預(yù)覽圖，如下圖
但是網(wǎng)頁千千萬，總不能一個個打開，截圖吧；于是想著能不能使用代碼來實現(xiàn)網(wǎng)頁的截圖。其實要實現(xiàn)這個功能，無非就是要么實現(xiàn)一個仿真瀏覽器，要么調(diào)用系統(tǒng)瀏覽器，再進行截圖操作。
代碼實現(xiàn)
1、啟用線程Thread
void startPrintScreen(ScreenShotParam requestParam)
{
Thread thread = new Thread(new ParameterizedThreadStart(do_PrintScreen));
thread.SetApartmentState(ApartmentState.STA);
thread.Start(requestParam);
if (requestParam.Wait)
{
thread.Join();
FileInfo result = new FileInfo(requestParam.SavePath);
long minSize = 1 * 1024;// 太小可能是空白圖，重抓
int maxRepeat = 2;
while ((!result.Exists || result.Length <= minSize) && maxRepeat > 0)
{
thread = new Thread(new ParameterizedThreadStart(do_PrintScreen));
thread.SetApartmentState(ApartmentState.STA);
thread.Start(requestParam);
thread.Join();
maxRepeat--;
}
}
}
2、模擬瀏覽器WebBrowser
void do_PrintScreen(object param)
{
try
{
ScreenShotParam screenShotParam = (ScreenShotParam)param;
string requestUrl = screenShotParam.Url;
string savePath = screenShotParam.SavePath;
WebBrowser wb = new WebBrowser();
wb.ScrollBarsEnabled = false;
wb.ScriptErrorsSuppressed = true;
wb.Navigate(requestUrl);
logger.Debug("wb.Navigate");
DateTime startTime = DateTime.Now;
TimeSpan waitTime = new TimeSpan(0, 0, 0, 10, 0);// 10 second
while (wb.ReadyState != WebBrowserReadyState.Complete)
{
Application.DoEvents();
if (DateTime.Now - startTime > waitTime)
{
wb.Dispose();
logger.Debug("wb.Dispose() timeout");
return;
}
}
wb.Width = screenShotParam.Left + screenShotParam.Width + screenShotParam.Left; // wb.Document.Body.ScrollRectangle.Width (避掉左右側(cè)的邊線);
wb.Height = screenShotParam.Top + screenShotParam.Height; // wb.Document.Body.ScrollRectangle.Height;
wb.ScrollBarsEnabled = false;
wb.Document.Body.Style = "overflow:hidden";//hide scroll bar
var doc = (wb.Document.DomDocument) as mshtml.IHTMLDocument2;
var style = doc.createStyleSheet("", 0);
style.cssText = @"img { border-style: none; }";
Bitmap bitmap = new Bitmap(wb.Width, wb.Height);
wb.DrawToBitmap(bitmap, new Rectangle(0, 0, wb.Width, wb.Height));
wb.Dispose();
logger.Debug("wb.Dispose()");
bitmap = CutImage(bitmap, new Rectangle(screenShotParam.Left, screenShotParam.Top, screenShotParam.Width, screenShotParam.Height));
bool needResize = screenShotParam.Width > screenShotParam.ResizeMaxWidth || screenShotParam.Height > screenShotParam.ResizeMaxWidth;
if (needResize)
{
double greaterLength = bitmap.Width > bitmap.Height ? bitmap.Width : bitmap.Height;
double ratio = screenShotParam.ResizeMaxWidth / greaterLength;
bitmap = Resize(bitmap, ratio);
}
bitmap.Save(savePath, System.Drawing.Imaging.ImageFormat.Gif);
bitmap.Dispose();
logger.Debug("bitmap.Dispose();");
logger.Debug("finish");
}
catch (Exception ex)
{
logger.Info($"exception: {ex.Message}");
}
}
3、截圖操作
private static Bitmap CutImage(Bitmap source, Rectangle section)
{
// An empty bitmap which will hold the cropped image
Bitmap bmp = new Bitmap(section.Width, section.Height);
//using (Bitmap bmp = new Bitmap(section.Width, section.Height))
{
Graphics g = Graphics.FromImage(bmp);
// Draw the given area (section) of the source image
// at location 0,0 on the empty bitmap (bmp)
g.DrawImage(source, 0, 0, section, GraphicsUnit.Pixel);
return bmp;
}
}
private static Bitmap Resize(Bitmap originImage, Double times)
{
int width = Convert.ToInt32(originImage.Width * times);
int height = Convert.ToInt32(originImage.Height * times);
return ResizeProcess(originImage, originImage.Width, originImage.Height, width, height);
}
完整代碼
public static string ScreenShotAndSaveAmazonS3(string account, string locale, Guid rule_ID, Guid template_ID)
{
//新的Template
var url = string.Format("https://xxxx/public/previewtemplate?showTemplateName=0&locale={0}&inputTemplateId={1}&inputThemeId=&Account={2}",
locale,
template_ID,
account
);
var tempPath = Tools.GetAppSetting("TempPath");
//路徑準(zhǔn)備
var userPath = AmazonS3.GetS3UploadDirectory(account, locale, AmazonS3.S3SubFolder.Template);
var fileName = string.Format("{0}.gif", template_ID);
var fullFilePath = Path.Combine(userPath.LocalDirectoryPath, fileName);
logger.Debug("userPath: {0}, fileName: {1}, fullFilePath: {2}, url:{3}", userPath, fileName, fullFilePath, url);
//開始截圖，並暫存在本機
var screen = new Screen();
screen.ScreenShot(url, fullFilePath);
//將截圖，儲存到 Amazon S3
//var previewImageUrl = AmazonS3.UploadFile(fullFilePath, userPath.RemotePath + fileName);
return string.Empty;
}
using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace PrintScreen.Common
{
public class Screen
{
protected static NLog.Logger logger = NLog.LogManager.GetCurrentClassLogger();
public void ScreenShot(string url, string path
, int width = 400, int height = 300
, int left = 50, int top = 50
, int resizeMaxWidth = 200, int wait = 1)
{
if (!string.IsNullOrEmpty(url) && !string.IsNullOrEmpty(path))
{
ScreenShotParam requestParam = new ScreenShotParam
{
Url = url,
SavePath = path,
Width = width,
Height = height,
Left = left,
Top = top,
ResizeMaxWidth = resizeMaxWidth,
Wait = wait != 0
};
startPrintScreen(requestParam);
}
}
void startPrintScreen(ScreenShotParam requestParam)
{
Thread thread = new Thread(new ParameterizedThreadStart(do_PrintScreen));
thread.SetApartmentState(ApartmentState.STA);
thread.Start(requestParam);
if (requestParam.Wait)
{
thread.Join();
FileInfo result = new FileInfo(requestParam.SavePath);
long minSize = 1 * 1024;// 太小可能是空白圖，重抓
int maxRepeat = 2;
while ((!result.Exists || result.Length <= minSize) && maxRepeat > 0)
{
thread = new Thread(new ParameterizedThreadStart(do_PrintScreen));
thread.SetApartmentState(ApartmentState.STA);
thread.Start(requestParam);
thread.Join();
maxRepeat--;
}
}
}
void do_PrintScreen(object param)
{
try
{
ScreenShotParam screenShotParam = (ScreenShotParam)param;
string requestUrl = screenShotParam.Url;
string savePath = screenShotParam.SavePath;
WebBrowser wb = new WebBrowser();
wb.ScrollBarsEnabled = false;
wb.ScriptErrorsSuppressed = true;
wb.Navigate(requestUrl);
logger.Debug("wb.Navigate");
DateTime startTime = DateTime.Now;
TimeSpan waitTime = new TimeSpan(0, 0, 0, 10, 0);// 10 second
while (wb.ReadyState != WebBrowserReadyState.Complete)
{
Application.DoEvents();
if (DateTime.Now - startTime > waitTime)
{
wb.Dispose();
logger.Debug("wb.Dispose() timeout");
return;
}
}
wb.Width = screenShotParam.Left + screenShotParam.Width + screenShotParam.Left; // wb.Document.Body.ScrollRectangle.Width (避掉左右側(cè)的邊線);
wb.Height = screenShotParam.Top + screenShotParam.Height; // wb.Document.Body.ScrollRectangle.Height;
wb.ScrollBarsEnabled = false;
wb.Document.Body.Style = "overflow:hidden";//hide scroll bar
var doc = (wb.Document.DomDocument) as mshtml.IHTMLDocument2;
var style = doc.createStyleSheet("", 0);
style.cssText = @"img { border-style: none; }";
Bitmap bitmap = new Bitmap(wb.Width, wb.Height);
wb.DrawToBitmap(bitmap, new Rectangle(0, 0, wb.Width, wb.Height));
wb.Dispose();
logger.Debug("wb.Dispose()");
bitmap = CutImage(bitmap, new Rectangle(screenShotParam.Left, screenShotParam.Top, screenShotParam.Width, screenShotParam.Height));
bool needResize = screenShotParam.Width > screenShotParam.ResizeMaxWidth || screenShotParam.Height > screenShotParam.ResizeMaxWidth;
if (needResize)
{
double greaterLength = bitmap.Width > bitmap.Height ? bitmap.Width : bitmap.Height;
double ratio = screenShotParam.ResizeMaxWidth / greaterLength;
bitmap = Resize(bitmap, ratio);
}
bitmap.Save(savePath, System.Drawing.Imaging.ImageFormat.Gif);
bitmap.Dispose();
logger.Debug("bitmap.Dispose();");
logger.Debug("finish");
}
catch (Exception ex)
{
logger.Info($"exception: {ex.Message}");
}
}
private static Bitmap CutImage(Bitmap source, Rectangle section)
{
// An empty bitmap which will hold the cropped image
Bitmap bmp = new Bitmap(section.Width, section.Height);
//using (Bitmap bmp = new Bitmap(section.Width, section.Height))
{
Graphics g = Graphics.FromImage(bmp);
// Draw the given area (section) of the source image
// at location 0,0 on the empty bitmap (bmp)
g.DrawImage(source, 0, 0, section, GraphicsUnit.Pixel);
return bmp;
}
}
private static Bitmap Resize(Bitmap originImage, Double times)
{
int width = Convert.ToInt32(originImage.Width * times);
int height = Convert.ToInt32(originImage.Height * times);
return ResizeProcess(originImage, originImage.Width, originImage.Height, width, height);
}
private static Bitmap ResizeProcess(Bitmap originImage, int oriwidth, int oriheight, int width, int height)
{
Bitmap resizedbitmap = new Bitmap(width, height);
//using (Bitmap resizedbitmap = new Bitmap(width, height))
{
Graphics g = Graphics.FromImage(resizedbitmap);
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
g.Clear(Color.Transparent);
g.DrawImage(originImage, new Rectangle(0, 0, width, height), new Rectangle(0, 0, oriwidth, oriheight), GraphicsUnit.Pixel);
return resizedbitmap;
}
}
}
class ScreenShotParam
{
public string Url { get; set; }
public string SavePath { get; set; }
public int Width { get; set; }
public int Height { get; set; }
public int Left { get; set; }
public int Top { get; set; }
/// <summary>
/// 長邊縮到指定長度
/// </summary>
public int ResizeMaxWidth { get; set; }
public bool Wait { get; set; }
}
}
效果
以上就是c# 實現(xiàn)網(wǎng)頁加載后將頁面截取為長圖片的詳細(xì)內(nèi)容，更多關(guān)于c# 頁面截取為圖片的資料請關(guān)注腳本之家其它相關(guān)文章！
您可能感興趣的文章:
- C# WPF如何反射加載Geometry幾何圖形數(shù)據(jù)圖標(biāo)
- c# WPF中自定義加載時實現(xiàn)帶動畫效果的Form和FormItem
- C# 根據(jù)表格偶數(shù)、奇數(shù)加載不同顏色
- C# 動態(tài)加載程序集信息
- C#中調(diào)用DLL時未能加載文件或程序集錯誤的處理方法(詳解)
- C#中加載dll并調(diào)用其函數(shù)的實現(xiàn)方法
- c# 動態(tài)加載dll文件,并實現(xiàn)調(diào)用其中的簡單方法
- C#使用Jquery zTree實現(xiàn)樹狀結(jié)構(gòu)顯示 異步數(shù)據(jù)加載
- C#使用反射加載多個程序集的實現(xiàn)方法
- C#實現(xiàn)動態(tài)加載dll的方法
- c#動態(tài)加載卸載DLL的方法
- 3種C# 加載Word的方法
相關(guān)文章
很多時候,我們在圖片或者其他（a標(biāo)簽，flash）中指定鏈接的時候，我們需要選擇是使用絕對路徑，或者是相對路徑.2012-11-11
c# AcceptEx與完成端口（IOCP）結(jié)合的示例
這篇文章主要介紹了c# AcceptEx與完成端口（IOCP）結(jié)合的示例，幫助大家更好的理解和學(xué)習(xí)使用c#，感興趣的朋友可以了解下2021-03-03
微軟發(fā)布C#6.0、VS2015等系列產(chǎn)品也有一段時間了，但是網(wǎng)上的教程卻不多，這里真對C#6.0給大家做了一些示例，分享給大家。2016-03-03
c# 調(diào)用Surfer軟件,添加引用的具體操作方法
本篇文章主要是對c#中調(diào)用Surfer軟件,添加引用的具體操作方法進行了介紹，需要的朋友可以過來參考下，希望對大家有所幫助2014-01-01
這篇文章主要為大家詳細(xì)介紹了如何基于WPF實現(xiàn)簡單的3D畫廊動畫效果，文中的示例代碼講解詳細(xì)，感興趣的小伙伴可以跟隨小編一起學(xué)習(xí)一下2023-02-02
最近的項目中有個關(guān)于網(wǎng)頁取圖的功能需要我自己開發(fā)，那就是用正則表達式來匹配圖片標(biāo)簽，這里簡單介紹下實現(xiàn)方法，需要的朋友可以參考下2013-12-12
C# 合并GriewView相同列的小例子，需要的朋友可以參考一下2013-03-03
這篇文章主要介紹了C#中的session用法 ,非常不錯，具有一定的參考借鑒價值，需要的朋友可以參考下2019-04-04
c#實現(xiàn)windows遠(yuǎn)程桌面連接程序代碼
本篇文章主要介紹了c#實現(xiàn)windows遠(yuǎn)程桌面連接程序代碼，小編覺得挺不錯的，現(xiàn)在分享給大家，也給大家做個參考。一起跟隨小編過來看看吧2017-05-05
在使用事件時，通常要定義兩個方法，一個是和事件定義的委托簽名一致的方法。下面讓我們看看使用事件的具體步驟。2016-06-06