winform调用摄像头拍照问题

winform调用摄像头拍照问题：用的拍照类如下：出现的问题是窗口不能完全显示画面，也就是说拍摄的图片比窗口显示的要全，要多，我要达到的目的是不管窗口多大都能完全显示画面，请问应该怎么调整代码呢？谢谢。

using System;
using System.Collections.Generic;
using System.Text;
//Download by http://www.codefans.net
using System.Runtime.InteropServices;
using System.Drawing.Design
;

namespace WindowsFormsApplication3
{
    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());

        }
    }

}

5 个解决方案

#1

图片比窗口大,肯定显示不下
不外呼就2种办法
1.图片缩放,设置picturebox以缩放的形式显示图片,而不是适应图片自身大小
2.窗体加滚动条

#2

这个我知道呀，我说的是照相的时候图片显示不全，就是摄像把pictureBox设置成zoom也不行，是不是应该修改调用摄像头的那个类呢？我不知该怎么该，请指教（下面第一张是摄像窗口的显示画面，第二张是点击拍摄，拍摄出的图片） winform调用摄像头拍照问题

#3

建议用AForge.net，这个比较成熟，网上也有现成的例子。

#4

用这种方式，很多高清摄像头不支持，而且还难以控制

#5

给一个AForge.net拍照的链接呗，谢谢

#1