using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.IO;
namespace CustomControl
{
public partial class WebCamControl : UserControl
{
public WebCamControl()
{
InitializeComponent();
mControlPtr = pictureBox1.Handle;
}
/// <summary>
/// 抓图完成
/// </summary>
public event Action<string> GrabImageCompleted;
/// <summary>
/// 录像完成
/// </summary>
public event Action<string> KinescopeCompleted;
/// <summary>
/// 开始录像,用以激活当前窗体,如果不激活显示的图像将出现条纹,影响观感
/// </summary>
public event EventHandler StartKinescope;
bool isActive = false;
[Browsable(true), Category("自定义属性"), Description("是否开启摄像头")]
public bool IsActive
{
get
{
return isActive;
}
set
{
isActive = value;
if (isActive)
{
mLeft = 0;
mTop = 0;
mWidth = pictureBox1.Width;
mHeight = pictureBox1.Height;
Start();
}
else
{
Stop();
}
}
}
/// <summary>
/// 相机是否开启
/// </summary>
[Browsable(true), Category("自定义属性"), Description("摄像头是否已开启")]
public bool IsOpen
{
get
{
return bStat;
}
}
const int WM_USER = 0x400;
const int WS_CHILD = 0x40000000;
const int WS_VISIBLE = 0x10000000;
const int WM_CAP_START = WM_USER;
const int WM_CAP_STOP = WM_CAP_START + 68;
const int WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10;
const int WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11;
const int WM_CAP_SAVEDIB = WM_CAP_START + 25;
const int WM_CAP_GRAB_FRAME = WM_CAP_START + 60;
const int WM_CAP_SEQUENCE = WM_CAP_START + 62;
const int WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + 20;
const int WM_CAP_SEQUENCE_NOFILE = WM_CAP_START + 63;
const int WM_CAP_SET_OVERLAY = WM_CAP_START + 51;
const int WM_CAP_SET_PREVIEW = WM_CAP_START + 50;
const int WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START + 6;
const int WM_CAP_SET_CALLBACK_ERROR = WM_CAP_START + 2;
const int WM_CAP_SET_CALLBACK_STATUSA = WM_CAP_START + 3;
const int WM_CAP_SET_CALLBACK_FRAME = WM_CAP_START + 5;
const int WM_CAP_SET_SCALE = WM_CAP_START + 53;
const int WM_CAP_SET_PREVIEWRATE = WM_CAP_START + 52;
const int WM_CAP_SET_EDIT_COPY = WM_CAP_START + 30;
IntPtr hWndc;
bool bStat;
IntPtr mControlPtr;
int mWidth;
int mHeight;
int mLeft;
int mTop;
string grabImagePath = "";
/// <summary>
/// 初始化摄像头
/// </summary>
/// <param name="handle">控件句柄</param>
/// <param name="left"></param>
/// <param name="top"></param>
/// <param name="width"></param>
/// <param name="height"></param>
public WebCamControl(IntPtr handle, int left, int top, int width, int height)
{
mControlPtr = handle;
mLeft = left;
mTop = top;
mWidth = width;
mHeight = height;
}
[Browsable(true), Category("自定义属性"), Description("视频窗口左边距")]
public int CamLeft
{
get { return mLeft; }
set { mLeft = value; }
}
[Browsable(true), Category("自定义属性"), Description("视频窗口右边距")]
public int CamTop
{
get
{
return mTop;
}
set
{
mTop = value;
}
}
[Browsable(true), Category("自定义属性"), Description("视频窗口宽度")]
public int CamWidth
{
set
{
mWidth = value;
}
get
{
return mWidth;
}
}
[Browsable(true), Category("自定义属性"), Description("视频窗口高度")]
public int CamHeight
{
set
{
mHeight = value;
}
get
{
return mHeight;
}
}
/// <summary>
/// 截图存放路径(bmp格式)
/// </summary>
[Browsable(true), Category("自定义属性"), Description("保存截图的文件名")]
public string GrabImagePath
{
get
{
return grabImagePath;
}
set
{
grabImagePath = value;
}
}
string kinescopePath;
/// <summary>
/// 录像存放路径(avi格式)
/// </summary>
[Browsable(true), Category("自定义属性"), Description("保存录像的文件名(视频格式为.avi)")]
public string KinescopePath
{
get
{
return kinescopePath;
}
set
{
kinescopePath = value;
}
}
private void btnOpen_Click(object sender, EventArgs e)
{
if (btnOpen.Text.Equals("开启相机"))
{
if (!IsOpen)
{
Start();
}
}
else
{
if (IsOpen)
{
Stop();
}
}
if (IsOpen)
{
btnOpen.Text = "关闭相机";
btnOpen.BackColor = Color.LightGreen;
btnGrabImage.Enabled = true;
btnKinescope.Enabled = true;
}
else
{
btnOpen.Text = "开启相机";
btnOpen.BackColor = Color.Red;
btnGrabImage.Enabled = false;
btnKinescope.Enabled = false;
}
}
private void btnGrabImage_Click(object sender, EventArgs e)
{
//判断临时文件是否存在
string tempDir = Path.Combine(Path.GetTempPath(), "WebCam");
if (!Directory.Exists(tempDir))
{
Directory.CreateDirectory(tempDir);
}
//生成临时文件名
string tempFileName = Path.Combine(tempDir, $"{DateTime.Now.ToString("HHmmss")}.bmp");
GrabImagePath = tempFileName;
GrabImage();
GrabImageCompleted?.BeginInvoke(GrabImagePath, null, null);
}
private void btnKinescope_Click(object sender, EventArgs e)
{
if (btnKinescope.Text.Equals("录像"))
{
//判断临时文件是否存在
string tempDir = Path.Combine(Path.GetTempPath(), "WebCam");
if (!Directory.Exists(tempDir))
{
Directory.CreateDirectory(tempDir);
}
//生成临时文件名
string tempFileName = Path.Combine(tempDir, $"{DateTime.Now.ToString("HHmmss")}.avi");
KinescopePath = tempFileName;
Task.Run(() =>
{
Kinescope();
});
btnKinescope.Text = "停止录像";
btnKinescope.BackColor = Color.LightSeaGreen;
StartKinescope?.Invoke(this, null);
}
else
{
StopKinescope();
KinescopeCompleted?.BeginInvoke(KinescopePath, null, null);
btnKinescope.Text = "录像";
btnKinescope.BackColor = Color.Red;
}
}
/// <summary>
/// 启动摄像头
/// </summary>
public void Start()
{
if (bStat)
return;
bStat = true;
byte[] lpszName = new byte[100];
hWndc = capCreateCaptureWindowA(lpszName, WS_CHILD | WS_VISIBLE, mLeft, mTop, mWidth, mHeight, mControlPtr, 0);
bool flag = false;
if (hWndc.ToInt32() != 0)
{
SendMessage(hWndc, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
SendMessage(hWndc, WM_CAP_SET_CALLBACK_ERROR, 0, 0);
SendMessage(hWndc, WM_CAP_SET_CALLBACK_STATUSA, 0, 0);
while (true)
{
flag = SendMessage(hWndc, WM_CAP_DRIVER_CONNECT, 0, 0);
if (flag) break;
}
SendMessage(hWndc, WM_CAP_SET_SCALE, 1, 0);
SendMessage(hWndc, WM_CAP_SET_PREVIEWRATE, 66, 0);
SendMessage(hWndc, WM_CAP_SET_OVERLAY, 1, 0);
SendMessage(hWndc, WM_CAP_SET_PREVIEW, 1, 0);
}
return;
}
/// <summary>
/// 停止摄像
/// </summary>
public void Stop()
{
SendMessage(hWndc, WM_CAP_DRIVER_DISCONNECT, 0, 0);
bStat = false;
}
/// <summary>
/// 抓图并保存为bmp文件
/// </summary>
public void GrabImage()
{
IntPtr hBmp = Marshal.StringToHGlobalAnsi(GrabImagePath);
SendMessage(hWndc, WM_CAP_SAVEDIB, 0, hBmp.ToInt32());
}
/// <summary>
/// 录像(格式为avi)
/// </summary>
public void Kinescope()
{
IntPtr hBmp = Marshal.StringToHGlobalAnsi(KinescopePath);
SendMessage(hWndc, WM_CAP_FILE_SET_CAPTURE_FILEA, 0, hBmp.ToInt32());
SendMessage(hWndc, WM_CAP_SEQUENCE, 0, 0);
}
/// <summary>
/// 将摄像头一帧数据存放在剪切板上
/// </summary>
public void CapturePicture()
{
SendMessage(hWndc, WM_CAP_SET_PREVIEWRATE, 125, 0);
SendMessage(hWndc, WM_CAP_SET_EDIT_COPY, 0, 0);
}
/// <summary>
/// 停止录像
/// </summary>
public void StopKinescope()
{
SendMessage(hWndc, WM_CAP_STOP, 0, 0);
}
/// <summary>
/// 创建一个视频捕捉窗口
/// </summary>
/// <param name="lpszWindowsName">标识窗口的名字</param>
/// <param name="dwStyle">标识窗口的风格</param>
/// <param name="x">标识窗口的左上角x点</param>
/// <param name="y">标识窗口的左上角y点</param>
/// <param name="nWidth">标识窗口的宽度</param>
/// <param name="nHeight">标识窗口的高度</param>
/// <param name="hWndParent">标识父窗口句柄</param>
/// <param name="nID">标识窗口ID</param>
/// <returns>视频捕捉窗口句柄</returns>
[DllImport("avicap32.dll")]
static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowsName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);
[DllImport("avicap32.dll")]
static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize);
/// <summary>
/// 向windows系统发送消息
/// </summary>
/// <param name="hWhd">窗口句柄</param>
/// <param name="msg">发送的消息</param>
/// <param name="wParam">消息参数</param>
/// <param name="lParam">消息参数</param>
/// <returns></returns>
[DllImport("User32.dll")]
static extern bool SendMessage(IntPtr hWhd, int msg, int wParam, int lParam);
}
}
通过C#代码实现开启摄像头,截图,录像等功能
于 2022-10-15 09:50:47 首次发布