using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Drawing.Design
;
namespace QQClass
{
public class VideoAPI //视频API类
{
///
/// 视频API调用
///
/// 标识窗口的名称
/// 标识窗口风格
/// 标识窗口的左上角坐标
/// 标识窗口右上角坐标
/// 标识窗口的宽度
/// 标识窗口的高度
/// 标识父窗口句柄
/// 窗口ID
/// 视频捕捉窗口句柄
[DllImport("avicap32.dll")]
public static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);
[DllImport("avicap32.dll")]
public static extern bool capGetDriverDescriptionA(short wDriver, byte[] lpszName, int cbName, byte[] lpszVer, int cbVer);
///
/// 用于向Windows系统发送消息机制
///
/// 窗口句柄
/// 发送消息
///
///
///
[DllImport("User32.dll")]
public static extern bool SendMessage(IntPtr hWnd, int wMsg, bool wParam, int lParam);
[DllImport("User32.dll")]
public static extern bool SendMessage(IntPtr hWnd, int wMsg, short wParam, int lParam);
// 常量
public const int WM_USER = 0x400;
public const int WS_CHILD = 0x40000000;
public const int WS_VISIBLE = 0x10000000;
public const int SWP_NOMOVE = 0x2;
public const int SWP_NOZORDER = 0x4;
public const int WM_CAP_DRIVER_CONNECT = WM_USER + 10;
public const int WM_CAP_DRIVER_DISCONNECT = WM_USER + 11;
public const int WM_CAP_SET_CALLBACK_FRAME = WM_USER + 5;
public const int WM_CAP_SET_PREVIEW = WM_USER + 50;
public const int WM_CAP_SET_PREVIEWRATE = WM_USER + 52;
public const int WM_CAP_SET_VIDEOFORMAT = WM_USER + 45;
public const int WM_CAP_START = WM_USER;
public const int WM_CAP_SAVEDIB = WM_CAP_START + 25;
public const int WM_CAP_SEQUENCE = WM_CAP_START + 62;
public const int WM_CAP_STOP = WM_CAP_START + 68;
}
public class cVideo //视频类
{
private IntPtr lwndC; //保存无符号句柄
private IntPtr mControlPtr; //保存管理指示器
private int mWidth;
private int mHeight;
public cVideo(IntPtr handle, int width, int height)
{
mControlPtr = handle; //显示视频控件的句柄
mWidth = width; //视频宽度
mHeight = height; //视频高度
}
public void capDlgVideoDisplay()
{
Boolean capDlgVideoDisplay = VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_START + 43, 0, 0);
}
public void capDlgVideoCompression()
{
Boolean capDlgVideoCompression = VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_START + 46, 0, 0);
}
/// <summary>
/// 打开视频设备
/// </summary>
public void StartWebCam()
{
byte[] lpszName = new byte[100];
byte[] lpszVer = new byte[100];
VideoAPI.capGetDriverDescriptionA(0, lpszName, 100, lpszVer, 100);
this.lwndC = VideoAPI.capCreateCaptureWindowA(lpszName, VideoAPI.WS_CHILD | VideoAPI.WS_VISIBLE, 0, 0, mWidth, mHeight, mControlPtr, 0);
// 使用下面的这段代码,图像会“变歪”
/*
if (VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_DRIVER_CONNECT, 0, 0))
{
VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_SET_PREVIEWRATE, 100, 0);
VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_SET_PREVIEW, true, 0);
}
*/
if (lwndC.ToInt32() != 0)
{
VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_START + 6, 0, 0);
VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_START + 2, 0, 0);
VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_START + 3, 0, 0);
VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_DRIVER_CONNECT, 0, 0);
VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_START + 53, 1, 0);
VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_SET_PREVIEWRATE, 66, 0);
VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_START + 51, 1, 0);
VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_SET_PREVIEW, 1, 0);
}
}
/// <summary>
/// 关闭视频设备
/// </summary>
public void CloseWebcam()
{
VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_DRIVER_DISCONNECT, 0, 0);
}
/// <summary>
/// 拍照
/// </summary>
/// <param name="path">要保存bmp文件的路径</param>
public void GrabImage(IntPtr hWndC, string path)
{
IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_SAVEDIB, 0, hBmp.ToInt32());
}
/// <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);
VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_DRIVER_CONNECT, 0, hBmp.ToInt32());
VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_SEQUENCE, 0, 0);
}
public void StartKinescope()
{
Kinescope("C:\\");
}
/// <summary>
/// 停止录像
/// </summary>
public void StopKinescope()
{
VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_STOP, 0, 0);
}
}
}