c#調用網路攝影機

 using System;

using System.Collections.Generic;

using System.Text;

using System.Runtime.InteropServices;

public class VideoWork

{

private const int WM_USER = 0×400;

private const int WS_CHILD = 0×40000000;

private const int WS_VISIBLE = 0×10000000;

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 bWorkStart = false;

private IntPtr mControlPtr;

private int mWidth;

private int mHeight;

private int mLeft;

private int mTop;

/// <summary>

/// 初始化顯示映像

/// </summary>

/// <param name= “handle “> 控制項的控制代碼 </param>

/// <param name= “left “> 開始顯示的左邊距 </param>

/// <param name= “top “> 開始顯示的上邊距 </param>

/// <param name= “width “> 要顯示的寬度 </param>

/// <param name= “height “> 要顯示的長度 </param>

public VideoWork(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);

//

//這裡特別注意，因為WinAPI中的long為32位，而C#中的long為64wei，所以需要將lParam該為int

//

[DllImport("User32.dll ")]

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

/// <summary>

/// 開始顯示映像

/// </summary>

public void Start()

{

if (bWorkStart)

return;

bWorkStart = 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);

//Global.log.Write( “SendMessage “);

}

return;

}

/// <summary>

/// 停止顯示

/// </summary>

public void Stop()

{

SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);

bWorkStart = false;

}

/// <summary>

/// 抓圖

/// </summary>

/// <param name= “path “> 要儲存bmp檔案的路徑 </param>

public void GrabImage(string path)

{

IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);

SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt32());

}

}

調用方法：

在表單上拖入一個panel

調用代碼為：

VideoWork wv = new VideoWork(panel1.Handle, 0, 0, panel1.Width, panel1.Height);

wv.Start();