Question

win7中c#调用电脑摄像头拍照

Answer 1

请先安装Microsoft DirectX SDK

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 调用摄像头
{
public partial class Form1 : Form
{

cVideo video;
public Form1()
{
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.bmp");

}

}
}

追问

唯一缺陷是还有个视频源选择弹出，不过已经很给力了