C#摄像头实现拍照功能的简单代码示例
2014-03-06 19:49
1221 查看
作者:
转自:http://www.csharpwin.com/csharpspace/5956r7934.shtml
摘要:这里将介绍一个C#摄像头实现拍照功能的简单代码示例,代码虽然不短,但是基本上实现了相对应的功能,希望对大家有所帮助。
C#摄像头实现拍照功能的简单代码示例
C#摄像头实现拍照功能的简单代码示例就介绍到这里。
转自:http://www.csharpwin.com/csharpspace/5956r7934.shtml
摘要:这里将介绍一个C#摄像头实现拍照功能的简单代码示例,代码虽然不短,但是基本上实现了相对应的功能,希望对大家有所帮助。
C#摄像头实现拍照功能的简单代码示例
using System; using System.Runtime.InteropServices; using System.Drawing; using System.Drawing.Imaging; namespace Video { /// /// 一个C#摄像头控制类 /// public class VideoWork { private const int WM_USER = 0x400; private const int WS_CHILD = 0x40000000; private const int WS_VISIBLE = 0x10000000; private const int WM_CAP_START = WM_USER; private const int WM_CAP_STOP = WM_CAP_START + 68; private const int WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10; private const int WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11; private const int WM_CAP_SAVEDIB = WM_CAP_START + 25; private const int WM_CAP_GRAB_FRAME = WM_CAP_START + 60; private const int WM_CAP_SEQUENCE = WM_CAP_START + 62; private const int WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + 20; private const int WM_CAP_SEQUENCE_NOFILE =WM_CAP_START+ 63; private const int WM_CAP_SET_OVERLAY =WM_CAP_START+ 51; private const int WM_CAP_SET_PREVIEW =WM_CAP_START+ 50; private const int WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START +6; private const int WM_CAP_SET_CALLBACK_ERROR=WM_CAP_START +2; private const int WM_CAP_SET_CALLBACK_STATUSA= WM_CAP_START +3; private const int WM_CAP_SET_CALLBACK_FRAME= WM_CAP_START +5; private const int WM_CAP_SET_SCALE=WM_CAP_START+ 53; private const int WM_CAP_SET_PREVIEWRATE=WM_CAP_START+ 52; private IntPtr hWndC; private bool bWorkStart = false; private IntPtr mControlPtr; private int mWidth; private int mHeight; private int mLeft; private int mTop; /// /// 初始化显示图像 /// /// 控件的句柄 /// 开始显示的左边距 /// 开始显示的上边距 /// 要显示的宽度 /// 要显示的长度 public VideoWork(IntPtr handle, int left, int top, int width,int height) { mControlPtr = handle; mWidth = width; mHeight = height; mLeft = left; mTop = top; } [DllImport("avicap32.dll")] private static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID); [DllImport("avicap32.dll")] private static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize ); [DllImport("User32.dll")] private static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, long lParam); /// /// 开始显示图像 /// public void Start() { if (bWorkStart) return; bWorkStart = true; byte[] lpszName = new byte[100]; hWndC = capCreateCaptureWindowA(lpszName,WS_CHILD|WS_VISIBLE ,mLeft,mTop,mWidth,mHeight,mControlPtr,0); if (hWndC.ToInt32() != 0) { SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0); SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, 0, 0); SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, 0, 0); SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0); SendMessage(hWndC, WM_CAP_SET_SCALE, 1, 0); SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, 66, 0); SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0); SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0); //Global.log.Write("SendMessage"); } return; } /// /// 停止显示 /// public void Stop() { SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0); bWorkStart = false; } /// /// 抓图 /// /// 要保存bmp文件的路径 public void GrabImage(string path) { IntPtr hBmp = Marshal.StringToHGlobalAnsi(path); SendMessage(hWndC,WM_CAP_SAVEDIB,0,hBmp.ToInt64()); } } } //这是一个控制摄像头进行拍照的类,我每次使用GrabImage抓图都是225K的一张照片,我想请问如何才能让我 //抓到的图片小一些,我想控制在70K左右。不知怎么让拍照的像素变小? if(this.Request.QueryString["filename"]!=null) { //获取原图片 string filename=this.Request.QueryString["filename"]; Bitmap bmpOld=new Bitmap(this.Server.MapPath("images/" + filename)); //计算缩小比例 double d1; if(bmpOld.Height>bmpOld.Width) d1=(double)(MaxLength/(double)bmpOld.Width); else d1=(double)(MaxLength/(double)bmpOld.Height); //产生缩图 Bitmap bmpThumb=new Bitmap(bmpOld,(int)(bmpOld.Width*d1),(int)(bmpOld.Height*d1)); //清除缓冲 Response.Clear(); //生成图片 bmpThumb.Save(this.Response.OutputStream,ImageFormat.Jpeg); Response.End(); //释放资源 bmpThumb.Dispose(); bmpOld.Dispose(); }
C#摄像头实现拍照功能的简单代码示例就介绍到这里。
相关文章推荐
- 谈谈C# 4.0新特性“缺省参数”的实现
- C#richTextBox1保存txt文档
- C# 获取制定文件所在路径
- C#访问URL方法
- C#下实现在ProgressBar控件上添加百分比
- [C#] 控制系统音量-第一章
- 【CSharp】简易命令行计算器实现
- 浅谈提升C#正则表达式效率
- C#开发Windows服务的基础代码
- c#保留小数点后两位
- C#中添加三个线程同时启动执行某一方法,并依次调用某方法中的循环打印输。
- C#快捷键
- C#根据字符串获得服务器控件值和改变值
- 认识C#之前
- C#操作XML配置文件
- C#对数组去重
- C# WinForm开发系列
- 编程(C#)实现创建 internet快捷方式 文件
- 编程(C#)实现创建快捷方式文件
- c# LINQ查询操作符实例操作总结3