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服务器之家 - 编程语言 - C# - C# 抓图服务的实现

C# 抓图服务的实现

2022-10-26 13:30xhubobo C#

这篇文章主要介绍了C# 抓图服务的实现,帮助大家更好的利用c#处理窗口,进行截图,感兴趣的朋友可以了解下

C#抓图服务首先抽象出抓图接口,然后对接口做基于公共操作的抽象类封装,之后针对不同的抓图方式做差异化处理,最后根据接口实现抓图服务。

注意:Win32封装实现参考C#使用BitBlt进行窗口抓图

Github示例工程:SimpleWindowCapture

1、抓图接口

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using System;
using Win32Proxy;
 
namespace CaptureProxy
{
 internal interface ICaptureHelper
 {
  bool Init(string windowName);
  bool Init(IntPtr handle);
  void Cleanup();
  bool RefreshWindow();
  bool ChangeWindowHandle(string windowName);
  bool ChangeWindowHandle(IntPtr handle);
  IntPtr Capture();
  bool Capture(out IntPtr bitsPtr, out int bufferSize, out Win32Types.Rect rect);
 
  Win32Types.Rect WindowRect { get; }
  Win32Types.Rect ClientRect { get; }
  int BitmapDataSize { get; }
  IntPtr BitmapPtr { get; }
  Win32Types.BitmapInfo BitmapInfo { get; }
 }
}
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using System.ComponentModel;
 
namespace CaptureProxy
{
 public enum CaptureType
 {
  [Description("使用CreateDIBSection抓图,速度快,但是无法抓取D3D等渲染的窗口")]
  CreateDibSection = 0,
 
  [Description("使用PrintWindow抓图,速度慢(16ms左右),但是可以抓取D3D等渲染的窗口")]
  PrintWindow
 }
}

2、抓图抽象类

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using System;
using Win32Proxy;
 
namespace CaptureProxy
{
 internal abstract class AbsCaptureHelper : ICaptureHelper
 {
  public Win32Types.Rect WindowRect => _windowRect;
  public Win32Types.Rect ClientRect => WinClientRect;
  public int BitmapDataSize => _bmpDataSize;
  public IntPtr BitmapPtr => HBitmap;
  public Win32Types.BitmapInfo BitmapInfo { get; } = new Win32Types.BitmapInfo();
 
  protected IntPtr HWnd = IntPtr.Zero;
  protected IntPtr HScrDc = IntPtr.Zero;
  protected IntPtr HMemDc = IntPtr.Zero;
  protected IntPtr HBitmap = IntPtr.Zero;
  protected IntPtr HOldBitmap = IntPtr.Zero;
 
  private Win32Types.Rect _windowRect;
  protected Win32Types.Rect WinClientRect;
  private int _bmpDataSize;
 
  protected abstract bool CommonInit();
  protected abstract IntPtr DoCapture();
  protected abstract bool DoCapture(out IntPtr bitsPtr);
 
  public bool Init(string windowName)
  {
   var handle = Win32Funcs.FindWindowWrapper(null, windowName);
   if (handle.Equals(IntPtr.Zero))
   {
    return false;
   }
 
   return Init(handle);
  }
 
  public bool Init(IntPtr handle)
  {
   HWnd = handle;
 
   //获取窗口大小
   if (!Win32Funcs.GetWindowRectWrapper(HWnd, out _windowRect)
    || !Win32Funcs.GetClientRectWrapper(HWnd, out WinClientRect))
   {
    return false;
   }
 
   _bmpDataSize = WinClientRect.Width * WinClientRect.Height * 3;
 
   return CommonInit();
  }
 
  public void Cleanup()
  {
   if (HBitmap.Equals(IntPtr.Zero))
   {
    return;
   }
 
   //删除用过的对象
   Win32Funcs.SelectObjectWrapper(HMemDc, HOldBitmap);
   Win32Funcs.DeleteObjectWrapper(HBitmap);
   Win32Funcs.DeleteDcWrapper(HMemDc);
   Win32Funcs.ReleaseDcWrapper(HWnd, HScrDc);
 
   HWnd = IntPtr.Zero;
   HScrDc = IntPtr.Zero;
   HMemDc = IntPtr.Zero;
   HBitmap = IntPtr.Zero;
   HOldBitmap = IntPtr.Zero;
   //_bitsPtr = IntPtr.Zero;
  }
 
  public bool RefreshWindow()
  {
   return ChangeWindowHandle(HWnd);
  }
 
  public bool ChangeWindowHandle(string windowName)
  {
   Cleanup();
   return Init(windowName);
  }
 
  public bool ChangeWindowHandle(IntPtr handle)
  {
   Cleanup();
   return Init(handle);
  }
 
  public IntPtr Capture()
  {
   if (HBitmap.Equals(IntPtr.Zero) || HMemDc.Equals(IntPtr.Zero) || HScrDc.Equals(IntPtr.Zero))
   {
    return IntPtr.Zero;
   }
 
   return DoCapture();
  }
 
  public bool Capture(out IntPtr bitsPtr, out int bufferSize, out Win32Types.Rect rect)
  {
   bitsPtr = IntPtr.Zero;
   bufferSize = _bmpDataSize;
   rect = WinClientRect;
 
   if (HBitmap.Equals(IntPtr.Zero) || HMemDc.Equals(IntPtr.Zero) || HScrDc.Equals(IntPtr.Zero))
   {
    return false;
   }
 
   return DoCapture(out bitsPtr);
  }
 }
}

3、抓图类实现

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using System;
using Win32Proxy;
 
namespace CaptureProxy
{
 internal class DibCaptureHelper : AbsCaptureHelper
 {
  private Win32Types.BitmapInfo _bitmapInfo;
  private IntPtr _bitsPtr = IntPtr.Zero;
 
  protected override bool CommonInit()
  {
   //位图信息
   _bitmapInfo = new Win32Types.BitmapInfo {bmiHeader = new Win32Types.BitmapInfoHeader()};
   _bitmapInfo.bmiHeader.Init();
   _bitmapInfo.bmiHeader.biWidth = WinClientRect.Width;
   _bitmapInfo.bmiHeader.biHeight = WinClientRect.Height;
   _bitmapInfo.bmiHeader.biPlanes = 1;
   _bitmapInfo.bmiHeader.biBitCount = 24;
   _bitmapInfo.bmiHeader.biSizeImage = (uint) (WinClientRect.Width * WinClientRect.Height);
   _bitmapInfo.bmiHeader.biCompression = (uint) Win32Consts.BitmapCompressionMode.BI_RGB;
 
   HScrDc = Win32Funcs.GetWindowDcWrapper(HWnd);
   HMemDc = Win32Funcs.CreateCompatibleDcWrapper(HScrDc);
   HBitmap = Win32Funcs.CreateDibSectionWrapper(HMemDc, ref _bitmapInfo,
    (uint) Win32Consts.DibColorMode.DIB_RGB_COLORS,
    out _bitsPtr, IntPtr.Zero, 0);
   HOldBitmap = Win32Funcs.SelectObjectWrapper(HMemDc, HBitmap);
 
   return true;
  }
 
  protected override IntPtr DoCapture()
  {
   var ret = Win32Funcs.BitBltWrapper(
    HMemDc, 0, 0, WinClientRect.Width, WinClientRect.Height,
    HScrDc, 0, 0,
    (uint) Win32Consts.RasterOperationMode.SRCCOPY);
   return ret ? _bitsPtr : IntPtr.Zero;
  }
 
  protected override bool DoCapture(out IntPtr bitsPtr)
  {
   bitsPtr = _bitsPtr;
   var ret = Win32Funcs.BitBltWrapper(
    HMemDc, 0, 0, WinClientRect.Width, WinClientRect.Height,
    HScrDc, 0, 0,
    (uint) Win32Consts.RasterOperationMode.SRCCOPY);
   return ret;
  }
 }
}
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using System;
using Win32Proxy;
 
namespace CaptureProxy
{
 internal class PrintCaptureHelper : AbsCaptureHelper
 {
  protected override bool CommonInit()
  {
   HScrDc = Win32Funcs.GetWindowDcWrapper(HWnd);
   HBitmap = Win32Funcs.CreateCompatibleBitmapWrapper(HScrDc, WinClientRect.Width, WinClientRect.Height);
   HMemDc = Win32Funcs.CreateCompatibleDcWrapper(HScrDc);
   HOldBitmap = Win32Funcs.SelectObjectWrapper(HMemDc, HBitmap);
   return true;
  }
 
  protected override IntPtr DoCapture()
  {
   var ret = Win32Funcs.PrintWindowWrapper(HWnd, HMemDc,
    (uint) Win32Consts.PrintWindowMode.PW_CLIENTONLY |
    (uint) Win32Consts.PrintWindowMode.PW_RENDERFULLCONTENT);
   return ret ? HBitmap : IntPtr.Zero;
  }
 
  protected override bool DoCapture(out IntPtr bitsPtr)
  {
   bitsPtr = HBitmap;
   var ret = Win32Funcs.PrintWindowWrapper(HWnd, HMemDc,
    (uint) Win32Consts.PrintWindowMode.PW_CLIENTONLY |
    (uint) Win32Consts.PrintWindowMode.PW_RENDERFULLCONTENT);
   return ret;
  }
 }
}

4、抓图服务

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using System;
using System.Collections.Generic;
using Win32Proxy;
 
namespace CaptureProxy
{
 public class CaptureService
 {
  private readonly Dictionary<string, ICaptureHelper> _dicCaptureHelper;
 
  /// <summary>
  /// 注册抓图服务
  /// </summary>
  /// <param name="name">抓图服务名称</param>
  /// <param name="windowName">窗口名称</param>
  /// <param name="type">抓图类型</param>
  /// <returns>true成功,false失败</returns>
  public bool RegisterCapture(string name, string windowName, CaptureType type = CaptureType.CreateDibSection)
  {
   if (string.IsNullOrEmpty(name) || _dicCaptureHelper.ContainsKey(name))
   {
    return false;
   }
 
   ICaptureHelper helper;
   switch (type)
   {
    case CaptureType.CreateDibSection:
     helper = new DibCaptureHelper();
     break;
    case CaptureType.PrintWindow:
     helper = new PrintCaptureHelper();
     break;
    default:
     return false;
   }
 
   if (!helper.Init(windowName))
   {
    return false;
   }
 
   _dicCaptureHelper.Add(name, helper);
 
   return true;
  }
 
  /// <summary>
  /// 注册抓图服务
  /// </summary>
  /// <param name="name">抓图服务名称</param>
  /// <param name="handle">窗口句柄</param>
  /// <param name="type">抓图类型</param>
  /// <returns>true成功,false失败</returns>
  public bool RegisterCapture(string name, IntPtr handle, CaptureType type = CaptureType.CreateDibSection)
  {
   if (string.IsNullOrEmpty(name) || _dicCaptureHelper.ContainsKey(name))
   {
    return false;
   }
 
   ICaptureHelper helper;
   switch (type)
   {
    case CaptureType.CreateDibSection:
     helper = new DibCaptureHelper();
     break;
    case CaptureType.PrintWindow:
     helper = new PrintCaptureHelper();
     break;
    default:
     return false;
   }
 
   if (!helper.Init(handle))
   {
    return false;
   }
 
   _dicCaptureHelper.Add(name, helper);
 
   return true;
  }
 
  /// <summary>
  /// 获取是否已注册抓图服务
  /// </summary>
  /// <param name="name">抓图服务名称</param>
  /// <returns>true已注册,false未注册</returns>
  public bool IsRegister(string name)
  {
   return !string.IsNullOrEmpty(name) && _dicCaptureHelper.ContainsKey(name);
  }
 
  /// <summary>
  /// 注销抓图服务
  /// </summary>
  /// <param name="name">抓图服务名称</param>
  public void UnRegisterCapture(string name)
  {
   if (string.IsNullOrEmpty(name) || !_dicCaptureHelper.ContainsKey(name))
   {
    return;
   }
 
   _dicCaptureHelper[name]?.Cleanup();
   _dicCaptureHelper.Remove(name);
  }
 
  /// <summary>
  /// 清理所有抓图服务
  /// </summary>
  public void Cleanup()
  {
   foreach (var helper in _dicCaptureHelper)
   {
    helper.Value?.Cleanup();
   }
 
   _dicCaptureHelper.Clear();
  }
 
  public bool RefreshWindow(string name)
  {
   var ret = !string.IsNullOrEmpty(name) && _dicCaptureHelper.ContainsKey(name);
   if (ret)
   {
    ret = _dicCaptureHelper[name].RefreshWindow();
   }
 
   return ret;
  }
 
  /// <summary>
  /// 修改窗口句柄
  /// </summary>
  /// <param name="name">抓图服务名称</param>
  /// <param name="handle">窗口句柄</param>
  public bool ChangeWindowHandle(string name, IntPtr handle)
  {
   return !string.IsNullOrEmpty(name) && _dicCaptureHelper.ContainsKey(name) &&
     _dicCaptureHelper[name].ChangeWindowHandle(handle);
  }
 
  /// <summary>
  /// 修改窗口句柄
  /// </summary>
  /// <param name="name">抓图服务名称</param>
  /// <param name="windowName">窗口名称</param>
  public bool ChangeWindowHandle(string name, string windowName)
  {
   return !string.IsNullOrEmpty(name) && _dicCaptureHelper.ContainsKey(name) &&
     _dicCaptureHelper[name].ChangeWindowHandle(windowName);
  }
 
  /// <summary>
  /// 获取窗口尺寸
  /// </summary>
  /// <param name="name">抓图服务名称</param>
  /// <param name="winRect">输出的窗口尺寸</param>
  /// <returns>true成功,false失败</returns>
  public bool GetWindowRect(string name, out Win32Types.Rect winRect)
  {
   var ret = !string.IsNullOrEmpty(name) && _dicCaptureHelper.ContainsKey(name);
   winRect = ret ? _dicCaptureHelper[name].WindowRect : new Win32Types.Rect();
   return ret;
  }
 
  /// <summary>
  /// 获取窗口客户区尺寸
  /// </summary>
  /// <param name="name">抓图服务名称</param>
  /// <param name="clientRect">输出的窗口客户区尺寸</param>
  /// <returns>true成功,false失败</returns>
  public bool GetClientRect(string name, out Win32Types.Rect clientRect)
  {
   var ret = !string.IsNullOrEmpty(name) && _dicCaptureHelper.ContainsKey(name);
   clientRect = ret ? _dicCaptureHelper[name].ClientRect : new Win32Types.Rect();
   return ret;
  }
 
  /// <summary>
  /// 获取抓图数据大小
  /// </summary>
  /// <param name="name">抓图服务名称</param>
  /// <param name="bmpDataSize">抓图数据大小</param>
  /// <returns>true成功,false失败</returns>
  public bool GetBitmapDataSize(string name, out int bmpDataSize)
  {
   var ret = !string.IsNullOrEmpty(name) && _dicCaptureHelper.ContainsKey(name);
   bmpDataSize = ret ? _dicCaptureHelper[name].BitmapDataSize : 0;
   return ret;
  }
 
  public IntPtr GetBitmapPtr(string name)
  {
   if (string.IsNullOrEmpty(name) || !_dicCaptureHelper.ContainsKey(name))
   {
    return IntPtr.Zero;
   }
 
   return _dicCaptureHelper[name].BitmapPtr;
  }
 
  public Win32Types.BitmapInfo GetBitmapInfo(string name)
  {
   if (string.IsNullOrEmpty(name) || !_dicCaptureHelper.ContainsKey(name))
   {
    return new Win32Types.BitmapInfo();
   }
 
   return _dicCaptureHelper[name].BitmapInfo;
  }
 
  /// <summary>
  /// 获取抓图
  /// </summary>
  /// <param name="name">抓图服务名称</param>
  /// <param name="bitsPtr">位图指针</param>
  /// <returns>true成功,false失败</returns>
  public bool Capture(string name, out IntPtr bitsPtr)
  {
   var ret = !string.IsNullOrEmpty(name) && _dicCaptureHelper.ContainsKey(name);
   bitsPtr = ret ? _dicCaptureHelper[name].Capture() : IntPtr.Zero;
   return ret && !bitsPtr.Equals(IntPtr.Zero);
  }
 
  /// <summary>
  /// 获取抓图
  /// </summary>
  /// <param name="name">抓图服务名称</param>
  /// <param name="bitsPtr">位图指针</param>
  /// <param name="bufferSize">位图数据大小</param>
  /// <param name="texSize">位图尺寸</param>
  /// <returns>true成功,false失败</returns>
  public bool Capture(string name, out IntPtr bitsPtr, out int bufferSize, out Win32Types.Rect texSize)
  {
   if (string.IsNullOrEmpty(name) || !_dicCaptureHelper.ContainsKey(name))
   {
    bitsPtr = IntPtr.Zero;
    bufferSize = 0;
    texSize = new Win32Types.Rect();
    return false;
   }
 
   return _dicCaptureHelper[name].Capture(out bitsPtr, out bufferSize, out texSize);
  }
 
  #region 单例模式
 
  private static CaptureService _instance;
 
  private static readonly object LockHelper = new object();
 
  private CaptureService()
  {
   _dicCaptureHelper = new Dictionary<string, ICaptureHelper>();
  }
 
  public static CaptureService Instance
  {
   get
   {
    if (_instance != null)
    {
     return _instance;
    }
 
    lock (LockHelper)
    {
     _instance = _instance ?? new CaptureService();
    }
 
    return _instance;
   }
  }
 
  #endregion
 }
}

5、使用示例

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using System;
using System.Threading;
using CaptureProxy;
using Win32Proxy;
 
namespace SimpleWindowCapture
{
 internal sealed class CaptureHelper
 {
  public event Action<string, IntPtr, Win32Types.BitmapInfo> CaptureDone =
   (captureName, bitmapPtr, bitmapInfo) => { };
 
  public int Fps { get; set; } = 15;
 
  private double TimerInterval => 1000.0 / Fps;
  private string _captureName;
  private Timer _timer;
 
  public bool Start(string captureName, IntPtr handle, CaptureType type = CaptureType.CreateDibSection)
  {
   if (!CaptureService.Instance.RegisterCapture(captureName, handle, type))
   {
    return false;
   }
 
   _captureName = captureName;
 
   //创建守护定时器,马上执行
   _timer = new Timer(CaptureFunc, null,
    TimeSpan.FromMilliseconds(0), Timeout.InfiniteTimeSpan);
 
   return true;
  }
 
  public void Stop()
  {
   //移除定时器
   _timer?.Dispose();
   _timer = null;
 
   CaptureService.Instance.UnRegisterCapture(_captureName);
   _captureName = string.Empty;
  }
 
  private void CaptureFunc(object state)
  {
   Capture();
 
   //执行下次定时器
   _timer?.Change(TimeSpan.FromMilliseconds(TimerInterval), Timeout.InfiniteTimeSpan);
  }
 
  private void Capture()
  {
   IntPtr bitsPtr;
   if (!CaptureService.Instance.Capture(_captureName, out bitsPtr))
   {
    return;
   }
 
   var bitmapPtr = CaptureService.Instance.GetBitmapPtr(_captureName);
   var bitmapInfo = CaptureService.Instance.GetBitmapInfo(_captureName);
   CaptureDone.Invoke(_captureName, bitmapPtr, bitmapInfo);
  }
 }
}

以上就是C# 抓图服务的实现的详细内容,更多关于c# 抓图服务的资料请关注服务器之家其它相关文章!

原文链接:https://www.cnblogs.com/xhubobo/p/12809988.html

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