C# 调用摄像头以及拍照 例子

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 testcam{ public partial class Form2 : Form { cVideo video; public Form2() { InitializeComponent(); } public class VideoAPI //视频API类 { // 视频API调用 [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); [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 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 } /// <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); 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); } } /// <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()); } } private void button1_Click(object sender, EventArgs e) { video = new cVideo(pictureBox1.Handle, pictureBox1.Width, pictureBox1.Height); video.StartWebCam(); } private void button2_Click(object sender, EventArgs e) { video.CloseWebcam(); } private void button3_Click(object sender, EventArgs e) { video.GrabImage(pictureBox1.Handle, "d:\\a.jpg"); } }}