c#在winfrom里面怎么设置按键录制视频全屏

你可以使用C#中的Screen类来截取屏幕，然后使用AVIFile库将截取的屏幕帧保存为AVI格式的视频文件。以下是一个简单的示例代码：

using System;
using System.Drawing;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace ScreenRecorder
{
    public partial class Form1 : Form
    {
        [DllImport("user32.dll")]
        static extern IntPtr GetDesktopWindow();

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

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

        [DllImport("avifil32.dll")]
        static extern void AVIFileInit();

        [DllImport("avifil32.dll")]
        static extern void AVIFileExit();

        [DllImport("avifil32.dll")]
        static extern int AVIFileOpenW(ref IntPtr ppfile, [MarshalAs(UnmanagedType.LPWStr)]string szFile, int uMode, int pclsidHandler);

        [DllImport("avifil32.dll")]
        static extern int AVIFileCreateStream(IntPtr pfile, out IntPtr ppavi, ref AVISTREAMINFOW psi);

        [DllImport("avifil32.dll")]
        static extern int AVIStreamSetFormat(IntPtr avi, int lPos, ref BITMAPINFOHEADER lpFormat, int cbFormat);

        [DllImport("avifil32.dll")]
        static extern int AVIStreamWrite(IntPtr pavi, int lStart, int lSamples, IntPtr lpBuffer, int cbBuffer, int dwFlags, int dummy1, int dummy2);

        [DllImport("avifil32.dll")]
        static extern int AVIStreamRelease(IntPtr pavi);

        [DllImport("avifil32.dll")]
        static extern int AVIFileRelease(IntPtr pfile);

        [StructLayout(LayoutKind.Sequential, Pack = 1)]
        struct BITMAPINFOHEADER
        {
            public int biSize;
            public int biWidth;
            public int biHeight;
            public short biPlanes;
            public short biBitCount;
            public int biCompression;
            public int biSizeImage;
            public int biXPelsPerMeter;
            public int biYPelsPerMeter;
            public int biClrUsed;
            public int biClrImportant;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 1)]
        struct AVISTREAMINFOW
        {
            public int fccType;
            public int fccHandler;
            public int dwFlags;
            public int dwCaps;
            public short wPriority;
            public short wLanguage;
            public int dwScale;
            public int dwRate;
            public int dwStart;
            public int dwLength;
            public int dwInitialFrames;
            public int dwSuggestedBufferSize;
            public int dwQuality;
            public int dwSampleSize;
            public short left;
            public short top;
            public short right;
            public short bottom;
        }

        IntPtr aviFile = IntPtr.Zero;
        IntPtr aviStream = IntPtr.Zero;
        BITMAPINFOHEADER bih = new BITMAPINFOHEADER();

        public Form1()
        {
            InitializeComponent();
        }

        private void btnStart_Click(object sender, EventArgs e)
        {
            AVIFileInit();

            // 打开AVI文件
            AVIFileOpenW(ref aviFile, "test.avi", 4097, 0);

            // 设置流格式
            bih.biSize = Marshal.SizeOf(typeof(BITMAPINFOHEADER));
            bih.biWidth = Screen.PrimaryScreen.Bounds.Width;
            bih.biHeight = Screen.PrimaryScreen.Bounds.Height;
            bih.biPlanes = 1;
            bih.biBitCount = 24;
            bih.biCompression = 0;
            bih.biSizeImage = bih.biWidth * bih.biHeight * 3;

            AVISTREAMINFOW strhdr = new AVISTREAMINFOW();
            strhdr.fccType = 1935960438;
            strhdr.fccHandler = 0;
            strhdr.dwFlags = 0;
            strhdr.dwCaps = 0;
            strhdr.wPriority = 0;
            strhdr.wLanguage = 0;
            strhdr.dwScale = 1;
            strhdr.dwRate = 25;
            strhdr.dwStart = 0;
            strhdr.dwLength = 0;
            strhdr.dwInitialFrames = 0;
            strhdr.dwSuggestedBufferSize = bih.biSizeImage;
            strhdr.dwQuality = -1;
            strhdr.dwSampleSize = 0;
            strhdr.left = 0;
            strhdr.top = 0;
            strhdr.right = (short)bih.biWidth;
            strhdr.bottom = (short)bih.biHeight;

            AVIFileCreateStream(aviFile, out aviStream, ref strhdr);

            AVIStreamSetFormat(aviStream, 0, ref bih, bih.biSize);

            timer1.Start();
        }

        private void btnStop_Click(object sender, EventArgs e)
        {
            timer1.Stop();

            AVIStreamRelease(aviStream);
            AVIFileRelease(aviFile);

            AVIFileExit();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            IntPtr hdcSrc = GetWindowDC(GetDesktopWindow());
            IntPtr hdcDest = bih.biHeight < 0 ? CreateCompatibleDC(hdcSrc) : CreateCompatibleDC(IntPtr.Zero);
            IntPtr hBitmap = CreateCompatibleBitmap(hdcSrc, Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
            IntPtr hOld = SelectObject(hdcDest, hBitmap);

            BitBlt(hdcDest, 0, 0, Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, hdcSrc, 0, 0, 13369376);

            AVIStreamWrite(aviStream, timer1.Interval * timer1.TickCount, 1, hBitmap, bih.biSizeImage, 0, 0, 0);

            SelectObject(hdcDest, hOld);
            DeleteObject(hBitmap);
            DeleteDC(hdcDest);
            ReleaseDC(IntPtr.Zero, hdcSrc);
        }
    }
}

在上面的代码中，我们使用了Windows API函数来截取屏幕，然后使用AVIFile库将帧写入AVI文件。你可以修改代码来控制录制的区域、帧率和保存的文件名等参数。