WebCam Video capture in C#.net Web Application
in [CSharp]
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From: Basha on 1 Jun 2010 09:44 Hi, What are the classes your using in WebCam Video capture Web application. How to handle PictureBox in C#.net Web Application. It seems PictureBox class is not there in Web Application. Could you please provide me a sample C#.net Web Code. Thank You. Regards, Basha djamila wrote: WebCam Highest resolution in a picture Box 06-Jun-08 Hello, I wrote a program in C# that displays a webcam capture in a picture box. I used windows API for this task. The program works well but the picture of the webcam capture in my program is not as clear as that of the webcam viewer. I need to have a very good resolution from my webcam. I bought the webcam that I think it has the clearest view and the highest resolution (Logitech QuickCam Pro 9000). I thought the first time that the problem is in my webcam device, but after a long search I realized that the problem is in my C# program.. Here is a summary of the program that I wrote. Please tell me which part of the program has to be changed in order to have a better view of my webcam. public class WebCamCapture { [DllImport("user32.dll", EntryPoint = "SendMessageA")] public static extern bool SendMessage( int hWnd, // handle to destination window int Msg, // message int wParam, // first message parameter CAPSTATUS lParam // second message parameter ); [DllImport("user32.dll", EntryPoint = "SendMessageA")] public static extern bool SendMessage( int hWnd, // handle to destination window int Msg, // message bool wParam, // first message parameter int lParam // second message parameter ); [DllImport("user32.dll", EntryPoint = "SendMessageA")] public static extern bool SendMessage( int hWnd, // handle to destination window int Msg, // message int wParam, // first message parameter int lParam // second message parameter ); [DllImport("user32.dll")] public static extern int SetWindowPos( int hWnd, int hWndInsertAfter, int x, int y, int cx, int cy, int wFlags ); [DllImport("user32.dll")] public static extern bool SetWindowPos(int hndw); public struct POINTAPI { int x; int y; } [DllImport("user32.dll")] public static extern bool DestroyWindow(int hWnd); public struct CAPSTATUS { public int uiImageWidth; // Width of the image public int uiImageHeight; // Height of the image int fLiveWindow; // Now Previewing video? int fOverlayWindow; // Now Overlaying video? int fScale; // Scale image to client? POINTAPI ptScroll; // Scroll position int fUsingDefaultPalette; // Using default driver palette? int fAudioHardware; // Audio hardware present? int fCapFileExists; // Does capture file exist? int dwCurrentVideoFrame; // # of video frames cap'td int dwCurrentVideoFramesDropped; // # of video frames dropped int dwCurrentWaveSamples; // # of wave samples cap'td int dwCurrentTimeElapsedMS; // Elapsed capture duration int hPalCurrent; // Current palette in use int fCapturingNow; // Capture in progress? int dwReturn; // Error value after any operation int wNumVideoAllocated; // Actual number of video buffers int wNumAudioAllocated; // Actual number of audio buffers } [DllImport("avicap32.dll")] public static extern int capCreateCaptureWindowA( string lpszWindowName, int dwStyle, int x, int y, int nWidth, short nHeight, int hWndParent, int nID ); [DllImport("avicap32.dll")] public static extern bool capGetDriverDescriptionA( short wDriver, string lpszName, int cbName, string lpszVer, int cbVer ); [DllImport("kernel32.Dll")] public static extern int DeleteFile(string lpPathName); } And here the program that displays my webcam capture in a picture box. bReturn = WebCamCapture.capGetDriverDescriptionA(x, strName, 100, strVer, 100); OpenPreviewWindow(); WebCamCapture.CAPSTATUS s = new WebCamCapture.CAPSTATUS(); bReturn = WebCamCapture.SendMessage(hHwnd, WM_CAP_GET_STATUS, Marshal.SizeOf(s), s); Debug.WriteLine(String.Format("Video Size {0} x {1}", s.uiImageWidth, s.uiImageHeight)); private void OpenPreviewWindow() { int iHeight = this.pictureBox.Height; int iWidth = this. pictureBox.Width; // Open Preview window in picturebox hHwnd = WebCamCapture.capCreateCaptureWindowA(iDevice.ToString(), WS_VISIBLE | WS_CHILD, 0, 0, 1280, 1024, this. pictureBox.Handle.ToInt32(), 0); // Connect to device if (WebCamCapture.SendMessage(hHwnd, WM_CAP_DRIVER_CONNECT, iDevice, 0)) { // Set the preview scale WebCamCapture.SendMessage(hHwnd, WM_CAP_SET_SCALE, true, 0); //Set the preview rate in milliseconds WebCamCapture.SendMessage(hHwnd, WM_CAP_SET_PREVIEWRATE, 66, 0); //Start previewing the image from the camera WebCamCapture.SendMessage(hHwnd, WM_CAP_SET_PREVIEW, true, 0); // Resize window to fit in picturebox WebCamCapture.SetWindowPos(hHwnd, HWND_BOTTOM, 0, 0, this. pictureBox.Width, this. pictureBox.Height, SWP_NOMOVE | SWP_NOZORDER); } else { // Error connecting to device close window hHwnd = 0; } } Previous Posts In This Thread: On Thursday, June 05, 2008 4:03 PM Peter Duniho wrote: Re: WebCam Highest resolution in a picture Box On Thu, 05 Jun 2008 12:41:20 -0700, djamila <djamilabouzid(a)gmail.com> wrote: I don't really understand why you're posting here. As near as I can tell from the code you posted, using a PictureBox is pointless, because all you use it for is the dimensions. You might as well just have a generic Control, because it's the web cam software itself creating the actual preview display window, in the same location as your PictureBox control. In other words, there's really nothing about your preview window that uses anything in .NET or C# at all, never mind the PictureBox itself. Your question seems better-directed at Logitech and/or a forum where questions about using avicap32.dll are relevant. You are much more likely to get a useful answer there. (Of course, it might just be "well, Logitech's own software uses proprietary features not available through avicap32.dll", but at least it'd be an actual answer :) ). And by the way, when you do find a more appropriate forum, you may want to be more specific about what you mean by "not as clear" and "highest resolution". The former is especially vague, and the latter also seems out of context. Pete On Friday, June 06, 2008 3:21 AM djamila wrote: WebCam Highest resolution in a picture Box Hello, I wrote a program in C# that displays a webcam capture in a picture box. I used windows API for this task. The program works well but the picture of the webcam capture in my program is not as clear as that of the webcam viewer. I need to have a very good resolution from my webcam. I bought the webcam that I think it has the clearest view and the highest resolution (Logitech QuickCam Pro 9000). I thought the first time that the problem is in my webcam device, but after a long search I realized that the problem is in my C# program.. Here is a summary of the program that I wrote. Please tell me which part of the program has to be changed in order to have a better view of my webcam. public class WebCamCapture { [DllImport("user32.dll", EntryPoint = "SendMessageA")] public static extern bool SendMessage( int hWnd, // handle to destination window int Msg, // message int wParam, // first message parameter CAPSTATUS lParam // second message parameter ); [DllImport("user32.dll", EntryPoint = "SendMessageA")] public static extern bool SendMessage( int hWnd, // handle to destination window int Msg, // message bool wParam, // first message parameter int lParam // second message parameter ); [DllImport("user32.dll", EntryPoint = "SendMessageA")] public static extern bool SendMessage( int hWnd, // handle to destination window int Msg, // message int wParam, // first message parameter int lParam // second message parameter ); [DllImport("user32.dll")] public static extern int SetWindowPos( int hWnd, int hWndInsertAfter, int x, int y, int cx, int cy, int wFlags ); [DllImport("user32.dll")] public static extern bool SetWindowPos(int hndw); public struct POINTAPI { int x; int y; } [DllImport("user32.dll")] public static extern bool DestroyWindow(int hWnd); public struct CAPSTATUS { public int uiImageWidth; // Width of the image public int uiImageHeight; // Height of the image int fLiveWindow; // Now Previewing video? int fOverlayWindow; // Now Overlaying video? int fScale; // Scale image to client? POINTAPI ptScroll; // Scroll position int fUsingDefaultPalette; // Using default driver palette? int fAudioHardware; // Audio hardware present? int fCapFileExists; // Does capture file exist? int dwCurrentVideoFrame; // # of video frames cap'td int dwCurrentVideoFramesDropped; // # of video frames dropped int dwCurrentWaveSamples; // # of wave samples cap'td int dwCurrentTimeElapsedMS; // Elapsed capture duration int hPalCurrent; // Current palette in use int fCapturingNow; // Capture in progress? int dwReturn; // Error value after any operation int wNumVideoAllocated; // Actual number of video buffers int wNumAudioAllocated; // Actual number of audio buffers } [DllImport("avicap32.dll")] public static extern int capCreateCaptureWindowA( string lpszWindowName, int dwStyle, int x, int y, int nWidth, short nHeight, int hWndParent, int nID ); [DllImport("avicap32.dll")] public static extern bool capGetDriverDescriptionA( short wDriver, string lpszName, int cbName, string lpszVer, int cbVer ); [DllImport("kernel32.Dll")] public static extern int DeleteFile(string lpPathName); } And here the program that displays my webcam capture in a picture box. bReturn = WebCamCapture.capGetDriverDescriptionA(x, strName, 100, strVer, 100); OpenPreviewWindow(); WebCamCapture.CAPSTATUS s = new WebCamCapture.CAPSTATUS(); bReturn = WebCamCapture.SendMessage(hHwnd, WM_CAP_GET_STATUS, Marshal.SizeOf(s), s); Debug.WriteLine(String.Format("Video Size {0} x {1}", s.uiImageWidth, s.uiImageHeight)); private void OpenPreviewWindow() { int iHeight = this.pictureBox.Height; int iWidth = this. pictureBox.Width; // Open Preview window in picturebox hHwnd = WebCamCapture.capCreateCaptureWindowA(iDevice.ToString(), WS_VISIBLE | WS_CHILD, 0, 0, 1280, 1024, this. pictureBox.Handle.ToInt32(), 0); // Connect to device if (WebCamCapture.SendMessage(hHwnd, WM_CAP_DRIVER_CONNECT, iDevice, 0)) { // Set the preview scale WebCamCapture.SendMessage(hHwnd, WM_CAP_SET_SCALE, true, 0); //Set the preview rate in milliseconds WebCamCapture.SendMessage(hHwnd, WM_CAP_SET_PREVIEWRATE, 66, 0); //Start previewing the image from the camera WebCamCapture.SendMessage(hHwnd, WM_CAP_SET_PREVIEW, true, 0); // Resize window to fit in picturebox WebCamCapture.SetWindowPos(hHwnd, HWND_BOTTOM, 0, 0, this. pictureBox.Width, this. pictureBox.Height, SWP_NOMOVE | SWP_NOZORDER); } else { // Error connecting to device close window hHwnd = 0; } } Submitted via EggHeadCafe - Software Developer Portal of Choice WPF Binding Beyond the Limitation of Name Scopes http://www.eggheadcafe.com/tutorials/aspnet/ef583104-e507-491d-b05f-49faac8854c8/wpf-binding-beyond-the-li.aspx
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