C#实现控制摄像头的类

2019-10-29 21:38:38

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这篇文章主要介绍了C#实现控制摄像头的类,涉及C#操作摄像头的初始化、抓图、录像等功能,具有一定参考借鉴价值,需要的朋友可以参考下

本文实例讲述了C#实现控制摄像头的类。分享给大家供大家参考。具体如下：

/// <summary>

/// 一个控制摄像头的类

/// </summary>

public class Pick

{

private const int WM_USER = 0x400;

private const int WS_CHILD = 0x40000000;

private const int WS_VISIBLE = 0x10000000;

private const int WM_CAP_START = WM_USER;

private const int WM_CAP_STOP = WM_CAP_START + 68;

private const int WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10;

private const int WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11;

private const int WM_CAP_SAVEDIB = WM_CAP_START + 25;

private const int WM_CAP_GRAB_FRAME = WM_CAP_START + 60;

private const int WM_CAP_SEQUENCE = WM_CAP_START + 62;

private const int WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + 20;

private const int WM_CAP_SEQUENCE_NOFILE = WM_CAP_START + 63;

private const int WM_CAP_SET_OVERLAY = WM_CAP_START + 51;

private const int WM_CAP_SET_PREVIEW = WM_CAP_START + 50;

private const int WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START + 6;

private const int WM_CAP_SET_CALLBACK_ERROR = WM_CAP_START + 2;

private const int WM_CAP_SET_CALLBACK_STATUSA = WM_CAP_START + 3;

private const int WM_CAP_SET_CALLBACK_FRAME = WM_CAP_START + 5;

private const int WM_CAP_SET_SCALE = WM_CAP_START + 53;

private const int WM_CAP_SET_PREVIEWRATE = WM_CAP_START + 52;

private IntPtr hWndC;

private bool bStat = false;

private IntPtr mControlPtr;

private int mWidth;

private int mHeight;

private int mLeft;

private int mTop;

/// <summary>

/// 初始化摄像头

/// </summary>

/// <param name="handle">控件的句柄</param>

/// <param name="left">开始显示的左边距</param>

/// <param name="top">开始显示的上边距</param>

/// <param name="width">要显示的宽度</param>

/// <param name="height">要显示的长度</param>

public Pick(IntPtr handle, int left, int top, int width, int height)

{

mControlPtr = handle;

mWidth = width;

mHeight = height;

mLeft = left;

mTop = top;

}

[DllImport("avicap32.dll")]

private static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);

[DllImport("avicap32.dll")]

private static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize);

[DllImport("User32.dll")]

private static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, long lParam);

/// <summary>

/// 开始显示图像

/// </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);

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);

SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0);

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>

/// 停止显示

/// </summary>

public void Stop()

{

SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);

bStat = false;

}

/// <summary>

/// 抓图

/// </summary>

/// <param name="path">要保存bmp文件的路径</param>

public void GrabImage(string path)

{

IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);

SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt64());

}

/// <summary>

/// 录像

/// </summary>

/// <param name="path">要保存avi文件的路径</param>

public void Kinescope(string path)

{

IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);

SendMessage(hWndC, WM_CAP_FILE_SET_CAPTURE_FILEA, 0, hBmp.ToInt64());

SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0);

}

/// <summary>

/// 停止录像

/// </summary>

public void StopKinescope()

{

SendMessage(hWndC, WM_CAP_STOP, 0, 0);

}

}