Question

C#怎么用代码打开电脑摄像头啊？

Answer 1

public partial class Form1 : Form

{

const short WM_CAP = 1024;

const int WM_CAP_DRIVER_CONNECT = WM_CAP + 10;

const int WM_CAP_DRIVER_DISCONNECT = WM_CAP + 11;

const int WM_CAP_EDIT_COPY = WM_CAP + 30;

const int WM_CAP_SET_PREVIEW = WM_CAP + 50;

const int WM_CAP_SET_PREVIEWRATE = WM_CAP + 52;

const int WM_CAP_SET_SCALE = WM_CAP + 53;

const int WS_CHILD = 1073741824;

const int WS_VISIBLE = 268435456;

const short SWP_NOMOVE = 2;

const short SWP_NOSIZE = 1;

const short SWP_NOZORDER = 4;

const short HWND_BOTTOM = 1;

int iDevice = 0;

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);

private void OpenPreviewWindow()

{

int iHeight = 320;

int iWidth = 200;

//

// 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);

}

}

private void ClosePreviewWindow()

{

//

// Disconnect from device

//

SendMessage(hHwnd, WM_CAP_DRIVER_DISCONNECT, iDevice, 0);

//

// close window

//

DestroyWindow(hHwnd);

}

private void button1_Click(object sender, EventArgs e)

{

iDevice = int.Parse(device_number_textBox.Text);

OpenPreviewWindow();

}

}
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