摄像头程序总是提示
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NHAV.png)
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网上找的帮助类
public class VideoAPI { //视频调用API [DllImport("avicap32.dll")] public static extern IntPtr capCreateCaptureWindow(byte[] strWindowName, int dwStyle, int x, int y, int width, int height, IntPtr hwdParent, int nID); [DllImport("avicap32.dll")] public static extern bool capGetDriverDescription(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); [DllImport("User32.dll")] public static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, string lParam); [DllImport("Kernel32.dll")] public static extern bool CloseHandle(IntPtr hObject); //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 const int WM_CAP_SET_SCALE = WM_USER + 53; public const int WM_COPYTOCLIPBORAD = WM_USER + 30; public const int WM_CAP_SEQUENCE = WM_USER + 62; public const int WM_CAP_FILE_SET_CAPTURE_FILE = WM_USER + 20; public const int WM_CAP_STOP = WM_USER + 68; } public class VideoClass { private IntPtr caphwnd; private IntPtr controlhwnd; private int height; private int width; private bool isstart = false; public VideoClass() { } public void Initialize(IntPtr controlhwnd, int width, int height) { this.controlhwnd = controlhwnd; this.width = width; this.height = height; } ~VideoClass() { if (isstart) { this.StopWebcam(); } } /// <summary> /// 检查是否有视频设备 /// </summary> /// <returns></returns> public bool CheckWebcamExist() { byte[] lpszName = new byte[100]; byte[] lpszVer = new byte[100]; VideoAPI.capGetDriverDescription(0, lpszName, 100, lpszVer, 100); caphwnd = VideoAPI.capCreateCaptureWindow(lpszName, VideoAPI.WS_CHILD | VideoAPI.WS_VISIBLE, 0, 0, this.width, this.height, this.controlhwnd, 1); if (caphwnd == null) { return false; } int index = 0; bool isconnect = VideoAPI.SendMessage(caphwnd, VideoAPI.WM_CAP_DRIVER_CONNECT, 0, 0); while (!isconnect) { isconnect = VideoAPI.SendMessage(caphwnd, VideoAPI.WM_CAP_DRIVER_CONNECT, 0, 0); if (++index <= 10) continue; } if (isconnect == false) { VideoAPI.CloseHandle(caphwnd); return false; } else { VideoAPI.SendMessage(caphwnd, VideoAPI.WM_CAP_DRIVER_DISCONNECT, 0, 0); return true; } } /// <summary> /// 启动视频设备 /// </summary> /// <returns></returns> public bool StartWebcam() { byte[] lpszName = new byte[100]; byte[] lpszVer = new byte[100]; VideoAPI.capGetDriverDescription(0, lpszName, 100, lpszVer, 100); caphwnd = VideoAPI.capCreateCaptureWindow(lpszName, VideoAPI.WS_CHILD | VideoAPI.WS_VISIBLE, 0, 0, this.width, this.height, this.controlhwnd, 1); if (caphwnd == null) { return false; } //解决在Win7系统下摄像头获取不到问题 int index=0; bool isconnect = VideoAPI.SendMessage(caphwnd, VideoAPI.WM_CAP_DRIVER_CONNECT, 0, 0); while (!isconnect) { isconnect = VideoAPI.SendMessage(caphwnd, VideoAPI.WM_CAP_DRIVER_CONNECT, 0, 0); if (++index <= 10) continue; } if(isconnect == false) { VideoAPI.CloseHandle(caphwnd); return false; } if (VideoAPI.SendMessage(caphwnd, VideoAPI.WM_CAP_SET_PREVIEWRATE, 66, 0) == false) { return false; } if (VideoAPI.SendMessage(caphwnd, VideoAPI.WM_CAP_SET_PREVIEW, true, 0) == false) { return false; } if (VideoAPI.SendMessage(caphwnd, VideoAPI.WM_CAP_SET_SCALE, 1, 0) == false) { return false; } isstart = true; return true; } /// <summary> /// 关闭视频设备 /// </summary> /// <returns></returns> public bool StopWebcam() { if (caphwnd != null) { isstart = false; return VideoAPI.SendMessage(caphwnd, VideoAPI.WM_CAP_DRIVER_DISCONNECT, 0, 0); } else return false; } public bool GrabImage(IntPtr hWndC, string path) { if (caphwnd != null) return VideoAPI.SendMessage(caphwnd, VideoAPI.WM_CAP_SAVEDIB, 0, path); else return false; } public bool SaveImage(string path) { return GrabImage(this.caphwnd, path); } public void CopyToClipBorad() { VideoAPI.SendMessage(caphwnd, VideoAPI.WM_COPYTOCLIPBORAD, 0, 0); } public System.Drawing.Image getCaptureImage() { System.Windows.Forms.IDataObject iData = System.Windows.Forms.Clipboard.GetDataObject(); System.Drawing.Image retImage = null; if (iData != null) { if (iData.GetDataPresent(System.Windows.Forms.DataFormats.Bitmap)) { retImage = (System.Drawing.Image)iData.GetData(System.Windows.Forms.DataFormats.Bitmap); } else if (iData.GetDataPresent(System.Windows.Forms.DataFormats.Dib)) { retImage = (System.Drawing.Image)iData.GetData(System.Windows.Forms.DataFormats.Dib); } } return retImage; } public bool StartRecordVideo(string path) { VideoAPI.SendMessage(caphwnd, VideoAPI.WM_CAP_FILE_SET_CAPTURE_FILE, 0, path); VideoAPI.SendMessage(caphwnd, VideoAPI.WM_CAP_SEQUENCE, 0, 0); return true; } public bool StopRecordVideo() { return VideoAPI.SendMessage(caphwnd, VideoAPI.WM_CAP_STOP, 0, 0); } }
初始化：
vc.Initialize(videobox.Handle, videobox.Width, videobox.Height);
启动摄像头：
vc.StartWebcam();
关闭摄像头：
vc.StopWebcam()；
多谢了，不过原来的那个问题还是存在啊
@demps_c: 我在win8 64位上测试正常，可以换台机器试试
@jello chen: 你关掉然后运行程序没有出现上面的那个图片吗？？？
@demps_c: 没有,可以试下我这个，http://files.cnblogs.com/files/jellochen/Debug.rar
@jello chen:我的电脑是net 4.0你的程序是4.5
@demps_c: 配置文件（不是vshost这个）中改下这个<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0" />再运行
@jello chen: 在哪改，我不知道
@demps_c: 在ThreadDemo.exe.config中，后面sku的Version改成4.0，再运行程序
@jello chen: 是能运行，可是如果你关掉程序，然后马上运行还是会出现那个图片提示
@demps_c: 驱动ok么
@jello chen: ok这个是我的笔记本摄像头，都没有任何问题
@demps_c: 在设备管理器里面把摄像头禁用，然后再启用试下
@jello chen: 肯定不是这个问题，刚刚写了另外一个程序，成功了。