小程序调用摄像头如何操作?

时间：2023-07-01 14:05 阅读数：43 人阅读分类：网站建设

　　小程序调用摄像头如何操作?小程序如何调用摄像头呢?小程序调用摄像头的编码怎么写?下面小编就来为大家介绍一下小程序调用摄像头如何操作?

　　来自：

　　using System;

　　using System.Collections.Generic;

　　using System.ComponentModel;

　　using System.Data;

　　using System.Drawing;

　　using System.Linq;

　　using System.Text;

　　using System.Windows.Forms;

　　using System.Runtime.InteropServices;

　　namespace WindowsFormsApplication24

　　{

　　public partial class Form1 : Form

　　{

　　public Form1()

　　{

　　InitializeComponent();

　　}

　　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();

　　}

　　picCapture为一个PictureBox

　　device_number_textBox.Text=0为一个TextBox,值为0

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