修正过的摄像头类(.NET2.0)

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修正过的摄像头类(UserLib.Device.PCCamera)

原来的代码在.NET2.0下会抛出PInvokeStackImbalance异常,

具体原因见我BLOG中另一篇: http://blog.csdn.net/Virlene/archive/2006/05/29/761412.aspx

所以我通过修改部分代码, 使其可以在.NET2.0下正常工作

注: 修改过的地方我加亮表示

以下是修改过的源代码:

using System;

using System.Runtime.InteropServices;

using System.Drawing;

using System.Drawing.Imaging;

namespace UserLib.Device

{

///<summary>

///一个控制摄像头的类

///</summary>

public class PCCamera

{

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;

[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, IntPtr wParam, IntPtr lParam);

///<summary>

///初始化摄像头

///</summary>

public PCCamera() { }

///<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 PCCamera(IntPtr handle, int left, int top, int width,int height)

{

mControlPtr = handle;

mWidth = width;

mHeight = height;

mLeft = left;

mTop = top;

}

///<summary>

///获取或设置控件的句柄

///</summary>

public IntPtr Handle

{

get

{

return mControlPtr;

}

set

{

mControlPtr = value;

}

///<summary>

///获取或设置显示的宽度

///</summary>

public int Width

{

get

{

return mWidth;

}

set

{

mWidth = value;

}

///<summary>

///获取或设置显示的高度

///</summary>

public int Height

{

get

{

return mHeight;

}

set

{

mHeight = value;

}

///<summary>

///获取或设置开始显示的左边距

///</summary>

public int Left

{

get

{

return mLeft;

}

set

{

mLeft = value;

}

///<summary>

///获取或设置开始显示的上边距

///</summary>

public int Top

{

get

{

return mTop;

}

set

{

mTop = value;

}

///<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, IntPtr.Zero, IntPtr.Zero);

SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, IntPtr.Zero, IntPtr.Zero);

SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, IntPtr.Zero, IntPtr.Zero);

SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, IntPtr.Zero, IntPtr.Zero);

SendMessage(hWndC, WM_CAP_SET_SCALE, new IntPtr(1), IntPtr.Zero);

SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, new IntPtr(66), IntPtr.Zero);

SendMessage(hWndC, WM_CAP_SET_OVERLAY, new IntPtr(1), IntPtr.Zero);

SendMessage(hWndC, WM_CAP_SET_PREVIEW, new IntPtr(1), IntPtr.Zero);

}

return;

}

///<summary>

///停止显示

///</summary>

public void Stop()

{

SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, IntPtr.Zero, IntPtr.Zero);

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, IntPtr.Zero, hBmp);

}

///<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, IntPtr.Zero, hBmp);

SendMessage(hWndC, WM_CAP_SEQUENCE, IntPtr.Zero, IntPtr.Zero);

}

///<summary>

///停止录像

///</summary>

public void StopKinescope()

{

SendMessage(hWndC, WM_CAP_STOP, IntPtr.Zero, IntPtr.Zero);

}