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C# 攝像頭控制類

發布者：巨石軟件工作室  發布時(shí)間：2014-04-11  閱讀次數：6302 次

public class F_Camera
{

private const short WM_CAP = 1024;
private const int WM_CAP_DRIVER_CONNECT = WM_CAP + 10;
private const int WM_CAP_DRIVER_DISCONNECT = WM_CAP + 11;
private const int WM_CAP_EDIT_COPY = WM_CAP + 30;
private const int WM_CAP_SET_PREVIEW = WM_CAP + 50;
private const int WM_CAP_SET_PREVIEWRATE = WM_CAP + 52;
private const int WM_CAP_SET_SCALE = WM_CAP + 53;
private const int WS_CHILD = 1073741824;
private const int WS_VISIBLE = 268435456;
private const short SWP_NOMOVE = 2;
private const short SWP_NOSIZE = 1;
private const short SWP_NOZORDER = 4;
private const short HWND_BOTTOM = 1;

private const int WM_CAP_SAVEDIB = 0x400 + 25;

public static int iDevice = 0;
private static int hHwnd;

[System.Runtime.InteropServices.DllImport("user32", EntryPoint = "SendMessageA")]

static extern int SendMessage(int hwnd, int wMsg, int wParam, [MarshalAs(UnmanagedType.AsAny)]

object lParam);

[System.Runtime.InteropServices.DllImport("user32", EntryPoint = "SetWindowPos")]

static extern int SetWindowPos(int hwnd, int hWndInsertAfter, int x, int y, int cx, int cy, int wFlags);

[System.Runtime.InteropServices.DllImport("user32")]

static extern bool DestroyWindow(int hndw);

[System.Runtime.InteropServices.DllImport("avicap32.dll")]

static extern int capCreateCaptureWindowA(string lpszWindowName, int dwStyle, int x, int y, int nWidth, short nHeight, int hWndParent, int nID);

[System.Runtime.InteropServices.DllImport("avicap32.dll")]

static extern bool capGetDriverDescriptionA(short wDriver, string lpszName, int cbName, string lpszVer, int cbVer);

public static void OpenPreviewWindow(System.Windows.Forms.PictureBox picCapture)
{

int iHeight = picCapture.Height;

int iWidth = picCapture.Width;

//

// Open Preview window in picturebox

//

hHwnd = capCreateCaptureWindowA(iDevice.ToString(), (WS_VISIBLE | WS_CHILD), 0, 0, 640, 480, picCapture.Handle.ToInt32(), 0);

//

// Connect to device

//

if (SendMessage(hHwnd, WM_CAP_DRIVER_CONNECT, iDevice, 0) == 1)
{

//

// Set the preview scale

//

SendMessage(hHwnd, WM_CAP_SET_SCALE, 1, 0);

//

// Set the preview rate in milliseconds

//

SendMessage(hHwnd, WM_CAP_SET_PREVIEWRATE, 66, 0);

//

// Start previewing the image from the camera

//

SendMessage(hHwnd, WM_CAP_SET_PREVIEW, 1, 0);

//

// Resize window to fit in picturebox

//

SetWindowPos(hHwnd, HWND_BOTTOM, 0, 0, iWidth, iHeight, (SWP_NOMOVE | SWP_NOZORDER));

}

else
{

//

// Error connecting to device close window

//

DestroyWindow(hHwnd);

}

}

public static void ClosePreviewWindow()
{

//

// Disconnect from device

//

SendMessage(hHwnd, WM_CAP_DRIVER_DISCONNECT, iDevice, 0);

//

// close window

//

DestroyWindow(hHwnd);

}

public static void GrabImage(string path)
{
IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
SendMessage(hHwnd, WM_CAP_SAVEDIB, 0, hBmp.ToInt32());
}
}