修正過的攝像頭類(UserLib.Device.PCCamera)
原來的代碼在.NET2.0下會拋出PInvokeStackImbalance異常,
具體原因見我BLOG中另一篇: http://blog.csdn.net/Virlene/archive/2006/05/29/761412.aspx
所以我通過修改部分代碼, 使其可以在.NET2.0下正常工作
注: 修改過的地方我加亮表示
以下是修改過的源代碼:
using System;
using System.Runtime.InteropServices;
using System.Drawing;
using System.Drawing.Imaging;
namespace UserLib.Device
{
///<summary>
///一個控制攝像頭的類
///</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>
///初始化攝像頭
///</summary>
public PCCamera() { }
///<summary>
///初始化攝像頭
///</summary>
///<param name="handle">控件的句柄</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 PCCamera(IntPtr handle, int left, int top, int width,int height)
{
mControlPtr = handle;
mWidth = width;
mHeight = height;
mLeft = left;
mTop = top;
}
///<summary>
///獲取或設置控件的句柄
///</summary>
public IntPtr Handle
{
get
{
return mControlPtr;
}
set
{
mControlPtr = value;
}
}
///<summary>
///獲取或設置顯示的寬度
///</summary>
public int Width
{
get
{
return mWidth;
}
set
{
mWidth = value;
}
}
///<summary>
///獲取或設置顯示的高度
///</summary>
public int Height
{
get
{
return mHeight;
}
set
{
mHeight = value;
}
}
///<summary>
///獲取或設置開始顯示的左邊距
///</summary>
public int Left
{
get
{
return mLeft;
}
set
{
mLeft = value;
}
}
///<summary>
///獲取或設置開始顯示的上邊距
///</summary>
public int Top
{
get
{
return mTop;
}
set
{
mTop = value;
}
}
///<summary>
///開始顯示圖像
///</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>
///停止顯示
///</summary>
public void Stop()
{
SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, IntPtr.Zero, IntPtr.Zero);
bStat = false;
}
///<summary>
///抓圖
///</summary>
///<param name="path">要保存bmp文件的路徑</param>
public void GrabImage(string path)
{
IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
SendMessage(hWndC, WM_CAP_SAVEDIB, IntPtr.Zero, hBmp);
}
///<summary>
///錄像
///</summary>
///<param name="path">要保存avi文件的路徑</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>
///停止錄像
///</summary>
public void StopKinescope()
{
SendMessage(hWndC, WM_CAP_STOP, IntPtr.Zero, IntPtr.Zero);
}
}
}