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本文是借助avicap32.dll库来驱动摄像头。做到了抓图、录像功能。
using system;
using system.runtime.interopservices;
using system.drawing;
using system.drawing.imaging;
namespace using system;
using system.runtime.interopservices;
using system.drawing;
using system.drawing.imaging;
namespace pickhead
{
/// <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);
}
}
}
