C#2008 代码 控制USB摄像头 ，不能显示图像？
RT ！
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 Temp{ public partial class frmCamera : Form { public frmCamera() { InitializeComponent(); pcc = new Camera.PCCamera(this.panelCamera.Handle, 0, 0, 320, 240); } private Camera.PCCamera pcc; //开始 private void btnStart_Click(object sender, EventArgs e) { pcc.Start(); } //停止 private void btnStop_Click(object sender, EventArgs e) { pcc.Stop(); } //截图 private void btnSaveImage_Click(object sender, EventArgs e) { Application.DoEvents(); pcc.GrabImage("c:\\" + System.DateTime.Now.ToString("yyyyMMddHHmmss") + ".jpg"); } //录像 private void btnKinescope_Click(object sender, EventArgs e) { pcc.Kinescope("c:\\" + System.DateTime.Now.ToString("yyyyMMddHHmmss") + ".avi"); } //停止录像 private void btnStopKinescope_Click(object sender, EventArgs e) { Application.DoEvents(); pcc.StopKinescope(); } }}namespace Camera{ /// <summary> /// 一个控制摄像头的类 /// </summary> public class PCCamera { 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 IntPtr mControlPtr; private bool bWorkStart = false; private int mWidth; private int mHeight; private int mLeft; private int mTop; /// <summary> /// 初始化显示图像 /// </summary> /// <param name="handle">控件的句柄 </param> /// <param name="left">开始显示的左边距 </param> /// <param name="top">开始显示的上边距 </param> /// <param name="width">要显示的宽度 </param> /// <param name="height">要显示的长度 </param> public PCCamera(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, IntPtr wParam, IntPtr lParam); /// <summary> /// 开始显示图像 /// </summary> 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, IntPtr.Zero, IntPtr.Zero); SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, IntPtr.Zero, IntPtr.Zero); SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, IntPtr.Zero, IntPtr.Zero); SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, IntPtr.Zero, IntPtr.Zero); SendMessage(hWndC, WM_CAP_SET_SCALE, (IntPtr)1, IntPtr.Zero); SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, (IntPtr)66, IntPtr.Zero); SendMessage(hWndC, WM_CAP_SET_OVERLAY, (IntPtr)1, IntPtr.Zero); SendMessage(hWndC, WM_CAP_SET_PREVIEW, (IntPtr)1, IntPtr.Zero); } return; } /// <summary> /// 停止显示图像 /// </summary> public void Stop() { SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, IntPtr.Zero, IntPtr.Zero); bWorkStart = false; } /// <summary> /// 抓图 /// </summary> /// <param name="path">要保存bmp文件的路径 </param> public void GrabImage(string path) { IntPtr hBmp = Marshal.StringToHGlobalAnsi(path); SendMessage(hWndC, WM_CAP_SAVEDIB, IntPtr.Zero, hBmp); } ///<summary> ///录像 ///</summary> ///<param name="path">要保存avi文件的路径</param> public void Kinescope(string path) { IntPtr hBmp = Marshal.StringToHGlobalAnsi(path); SendMessage(hWndC, WM_CAP_FILE_SET_CAPTURE_FILEA, IntPtr.Zero, hBmp); SendMessage(hWndC, WM_CAP_SEQUENCE, IntPtr.Zero, IntPtr.Zero); } ///<summary> ///停止录像 ///</summary> public void StopKinescope() { SendMessage(hWndC, WM_CAP_STOP, IntPtr.Zero, IntPtr.Zero); } }}问题是 [color=#FF0000]运行程序在点及 “开始” 按扭后在panel 区域不能显示图像，panel 显示为黑色。[/color]当然也就不能截图和录像了。[color=#FF00FF]Why ?[/color]
public class Camera { 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_CUTIMAGE = 0x41e; //剪切当前图像 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 const int WM_CAP_DLG_VIDEOFORMAT = WM_CAP_START + 41; private const int WM_CAP_DLG_VIDEOSOURCE = WM_CAP_START + 42; private const int WM_CAP_DLG_VIDEODISPLAY = WM_CAP_START + 43; private const int WM_CAP_DLG_VIDEOCOMPRESSION = WM_CAP_START + 46; private IntPtr hWndC; private bool bStat = false; private IntPtr mControlPtr; private int mWidth; private int mHeight; private int mLeft; private int mTop; /// <summary> /// 初始化摄像头 /// </summary> /// <param name="handle">控件的句柄</param> /// <param name="left">开始显示的左边距</param> /// <param name="top">开始显示的上边距</param> /// <param name="width">要显示的宽度</param> /// <param name="height">要显示的长度</param> public Camera(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); private static extern IntPtr capCreateCaptureWindowA([MarshalAs(UnmanagedType.VBByRefStr)] ref string 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); [DllImport("user32", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)] private static extern bool DestroyWindow(int hndw); private void capDlgVideoFormat() { Boolean capDlgVideoFormat = SendMessage(hWndC, WM_CAP_DLG_VIDEOFORMAT, 0, 0); } private void capDlgVideoSource() { Boolean capDlgVideoSource = SendMessage(hWndC, WM_CAP_DLG_VIDEOSOURCE, 0, 0); } private void capDlgVideoDisplay() { Boolean capDlgVideoDisplay = SendMessage(hWndC, WM_CAP_DLG_VIDEODISPLAY, 0, 0); } private void capDlgVideoCompression() { Boolean capDlgVideoCompression = SendMessage(hWndC, WM_CAP_DLG_VIDEOCOMPRESSION, 0, 0); } /// <summary> /// 开始显示图像 /// </summary> public void Start() { if (bStat) return; bStat = true; byte[] lpszName = new byte[100]; //hWndC = capCreateCaptureWindowA(lpszName, WS_CHILD | WS_VISIBLE, mLeft, mTop, mWidth, mHeight, mControlPtr, 0); int intDevice = 0; string refDevice = intDevice.ToString(); hWndC = capCreateCaptureWindowA(ref refDevice, 1342177280, mLeft, mTop, mWidth, mHeight, mControlPtr, 0); //Console.WriteLine("驱动:" + refDevice); if (SendMessage(hWndC, 0x40a, intDevice, 0)) { //Console.WriteLine("摄像头正常"); } else { //Console.WriteLine("未检测到摄像头"); throw new PCCameraException(); } 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); } return; } /// <summary> /// 停止显示 /// </summary> public void Stop() { SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0); bStat = false; } /// <summary> /// 抓图 /// </summary> /// <param name="path">要保存文件的路径</param> public void GrabImage(string path) { try { IntPtr hBmp = Marshal.StringToHGlobalAnsi(path); //SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt64()); //该方式无法控制保存图像格式 SendMessage(hWndC, WM_CAP_CUTIMAGE, 0, 0); System.Windows.Forms.IDataObject dataObject = Clipboard.GetDataObject(); if (dataObject.GetDataPresent(typeof(Bitmap))) { Image img = (Image)dataObject.GetData(typeof(Bitmap)); img.Save(path, ImageFormat.Jpeg); } } catch (Exception exc) { throw new CameraException(exc); } } /// <summary> /// 录像 /// </summary> /// <param name="path">要保存avi文件的路径</param> public void Kinescope(string path) { IntPtr hBmp = Marshal.StringToHGlobalAnsi(path); SendMessage(hWndC, WM_CAP_FILE_SET_CAPTURE_FILEA, 0, hBmp.ToInt64()); SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0); } /// <summary> /// 停止录像 /// </summary> public void StopKinescope() { SendMessage(hWndC, WM_CAP_STOP, 0, 0); } /// <summary> /// 打开属性设置对话框，设置对比度、亮度等。 /// (视频源对话框) 选择视频输入通道和视频图像的动态参数。 /// </summary> public void ShowConfig() { SendMessage(hWndC, WM_CAP_DLG_VIDEOSOURCE, 0, 0); } }
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