WPF截屏

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WPF截屏

前言

如果电脑有多屏这里只截取主屏。

C#截屏

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public static void ScreenShot(string savePath)
{
    using (Bitmap bmp = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb))
    {
        using (Graphics g = Graphics.FromImage(bmp))
        {
            g.CopyFromScreen(0, 0, 0, 0, bmp.Size);
            bmp.Save(savePath, ImageFormat.Jpeg);

            //MemoryStream data = new MemoryStream();
            //bmp.Save(data, ImageFormat.Png);
        }
    }
}

调用系统DLL

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using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;

namespace SchoolClient.Utils
{
    public class ZScreenCapture
    {
        /// <summary>
        /// Creates an Image object containing a screen shot of the entire desktop
        /// </summary>
        /// <returns>
        /// </returns>
        public static Image CaptureScreen()
        {
            return CaptureWindow(User32.GetDesktopWindow());
        }

        public static void CaptureScreenSave(string savePath)
        {
            using (Image img = CaptureWindow(User32.GetDesktopWindow()))
            {
                img.Save(savePath, ImageFormat.Jpeg);
            }
        }

        /// <summary>
        /// Creates an Image object containing a screen shot of a specific window
        /// </summary>
        /// <param name="handle">
        /// The handle to the window. (In windows forms, this is obtained by the Handle property)
        /// </param>
        /// <returns>
        /// </returns>
        private static Image CaptureWindow(IntPtr handle)
        {
            // get te hDC of the target window
            IntPtr hdcSrc = User32.GetWindowDC(handle);
            // get the size
            User32.RECT windowRect = new User32.RECT();
            User32.GetWindowRect(handle, ref windowRect);
            int width = windowRect.right - windowRect.left;
            int height = windowRect.bottom - windowRect.top;
            // create a device context we can copy to
            IntPtr hdcDest = GDI32.CreateCompatibleDC(hdcSrc);
            // create a bitmap we can copy it to, using GetDeviceCaps to get the width/height
            IntPtr hBitmap = GDI32.CreateCompatibleBitmap(hdcSrc, width, height);
            // select the bitmap object
            IntPtr hOld = GDI32.SelectObject(hdcDest, hBitmap);
            // bitblt over
            GDI32.BitBlt(hdcDest, 0, 0, width, height, hdcSrc, 0, 0, GDI32.SRCCOPY | GDI32.CAPTUREBLT);
            // restore selection
            GDI32.SelectObject(hdcDest, hOld);
            // clean up
            GDI32.DeleteDC(hdcDest);
            User32.ReleaseDC(handle, hdcSrc);
            // get a .NET image object for it
            Image img = Image.FromHbitmap(hBitmap);
            // free up the Bitmap object
            GDI32.DeleteObject(hBitmap);
            return img;
        }

        /// <summary>
        /// Helper class containing Gdi32 API functions
        /// </summary>
        private class GDI32
        {
            public const int CAPTUREBLT = 1073741824;
            public const int SRCCOPY = 0x00CC0020; // BitBlt dwRop parameter

            [DllImport("gdi32.dll")]
            public static extern bool BitBlt(IntPtr hObject, int nXDest, int nYDest,
                int nWidth, int nHeight, IntPtr hObjectSource,
                int nXSrc, int nYSrc, int dwRop);

            [DllImport("gdi32.dll")]
            public static extern IntPtr CreateCompatibleBitmap(IntPtr hDC, int nWidth,
                int nHeight);

            [DllImport("gdi32.dll")]
            public static extern IntPtr CreateCompatibleDC(IntPtr hDC);

            [DllImport("gdi32.dll")]
            public static extern bool DeleteDC(IntPtr hDC);

            [DllImport("gdi32.dll")]
            public static extern bool DeleteObject(IntPtr hObject);

            [DllImport("gdi32.dll")]
            public static extern IntPtr SelectObject(IntPtr hDC, IntPtr hObject);
        }

        /// <summary>
        /// Helper class containing User32 API functions
        /// </summary>
        private class User32
        {
            [StructLayout(LayoutKind.Sequential)]
            public struct RECT
            {
                public int left;
                public int top;
                public int right;
                public int bottom;
            }

            [DllImport("user32.dll")]
            public static extern IntPtr GetDesktopWindow();

            [DllImport("user32.dll")]
            public static extern IntPtr GetWindowDC(IntPtr hWnd);

            [DllImport("user32.dll")]
            public static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDC);

            [DllImport("user32.dll")]
            public static extern IntPtr GetWindowRect(IntPtr hWnd, ref RECT rect);
        }
    }
}

调用C++DLL

https://www.psvmc.cn/article/2021-07-08-image-cpp.html

调用三方程序

注意

这种方式截屏会导致鼠标光标现在旋转的动画，如果反复调用体验不好，我这里已更换为C#调用C++进行截屏的方式了。

使用nircmd.exe截屏

官网：http://www.nirsoft.net/utils/nircmd.html

链接：https://pan.baidu.com/s/1AyGNHN5XM5v08gjGx3y6Dw
提取码：sytu 

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nircmd.exe savescreenshot "d:\temp.png"

这种方法其实各种语言都可以使用。

首先在项目下放入下载的exe路径：Tools/nircmd.exe

项目右键=>属性=>生成事件=>生成前事件命令行 添加如下

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xcopy /Y /i /e $(ProjectDir)\Tools $(TargetDir)\Tools

目的是为了打包运行时能够找到 nircmd.exe

工具类

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using System;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;

namespace SchoolClient.Utils
{
    internal class ZScreenUtil2
    {
        public static bool CaptureScreenSave(string filePath)
        {
            int lastindex = filePath.LastIndexOf(Path.DirectorySeparatorChar);
            if (lastindex < filePath.Length)
            {
                string fileFolder = filePath.Substring(0, lastindex);
                string filename = filePath.Substring(lastindex + 1);
                string tempFilePath = fileFolder + Path.DirectorySeparatorChar + "_temp_" + filename;

                string basePath = AppDomain.CurrentDomain.BaseDirectory;
                string toolsPath = System.IO.Path.Combine(basePath, "Tools");

                Process mps = new Process();
                ProcessStartInfo mpsi = new ProcessStartInfo("nircmd.exe", "savescreenshot \"" + tempFilePath+"\"" )
                {
                    WorkingDirectory = toolsPath,
                    UseShellExecute = true,
                    RedirectStandardInput = false,
                    RedirectStandardOutput = false,
                    CreateNoWindow = true,
                    WindowStyle = ProcessWindowStyle.Hidden
                };
                mps.StartInfo = mpsi;
                mps.Start();
                mps.WaitForExit();
                mps.Close();

                bool result = GetPicThumbnail(tempFilePath, filePath, 1920, 1080, 80, true);
                return result;
            }
            else
            {
                return false;
            }
        }

        /// 无损压缩图片
        /// <param name="sFile">原图片</param>
        /// <param name="dFile">压缩后保存位置</param>
        /// <param name="dWidth"></param>
        /// <param name="dHeight">高度</param>
        /// <param name="ratio">压缩质量(数字越小压缩率越高) 1-100</param>
        /// <returns></returns>
        public static bool GetPicThumbnail(string sFile, string dFile, int dWidth, int dHeight, int ratio, bool deleteSFile)
        {
            System.Drawing.Image iSource = System.Drawing.Image.FromFile(sFile);
            ImageFormat tFormat = iSource.RawFormat;

            //按比例缩放
            Size tem_size = new Size(iSource.Width, iSource.Height);
            int sW;
            int sH;
            if (tem_size.Width > dHeight || tem_size.Width > dWidth)
            {
                if ((tem_size.Width * dHeight) > (tem_size.Width * dWidth))
                {
                    sW = dWidth;
                    sH = (dWidth * tem_size.Height) / tem_size.Width;
                }
                else
                {
                    sH = dHeight;
                    sW = (tem_size.Width * dHeight) / tem_size.Height;
                }
            }
            else
            {
                sW = tem_size.Width;
                sH = tem_size.Height;
            }

            Bitmap ob = new Bitmap(dWidth, dHeight);
            Graphics g = Graphics.FromImage(ob);

            g.Clear(Color.WhiteSmoke);
            g.CompositingQuality = CompositingQuality.HighQuality;
            g.SmoothingMode = SmoothingMode.HighQuality;
            g.InterpolationMode = InterpolationMode.HighQualityBicubic;

            g.DrawImage(
                    iSource,
                    new Rectangle((dWidth - sW) / 2,(dHeight - sH) / 2, sW, sH),
                    0,
                    0,
                    iSource.Width,
                    iSource.Height,
                    GraphicsUnit.Pixel
                );

            g.Dispose();
            //以下代码为保存图片时，设置压缩质量
            EncoderParameters ep = new EncoderParameters();
            long[] qy = new long[1];
            qy[0] = ratio;//设置压缩的比例1-100
            EncoderParameter eParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qy);
            ep.Param[0] = eParam;
            try
            {
                ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();
                ImageCodecInfo jpegICIinfo = null;
                for (int x = 0; x < arrayICI.Length; x++)
                {
                    if (arrayICI[x].FormatDescription.Equals("JPEG"))
                    {
                        jpegICIinfo = arrayICI[x];
                        break;
                    }
                }
                if (jpegICIinfo != null)
                {
                    ob.Save(dFile, jpegICIinfo, ep);//dFile是压缩后的新路径
                }
                else
                {
                    ob.Save(dFile, tFormat);
                }
                return true;
            }
            catch
            {
                return false;
            }
            finally
            {
                iSource.Dispose();
                ob.Dispose();

                if (deleteSFile)
                {
                    FileInfo di = new FileInfo(sFile);
                    if (di.Exists)
                    {
                        try
                        {
                            di.Delete();
                        }
                        catch (Exception)
                        {
                        }
                    }
                }
            }
        }
    }
}

注意在压缩图片前一定要调用

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mps.WaitForExit();
mps.Close();

这样才会在生成图片后进行压缩。