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分享winform 获取usb摄像头，每次都弹出摄像头源对话框，怎么不让它弹出呢
winform 获取usb摄像头，每次都弹出摄像头源对话框，怎么不让它弹出呢
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ZhongGuanYao 2014-08-12
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在codeproject找到了一份
http://www.codeproject.com/Articles/671407/Camera-Net-Library
泡泡龙 2014-08-12
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7楼的就是VFW，当然有这毛病了，换direct show试试吧，有开源库[/quote]
我需要用摄像头拍一张图片，请问有没有direct show这方面的资源，可不可发一份给我598115778@qq.com,，谢谢[/quote]
百度 Aforge
ZhongGuanYao 2014-08-12
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7楼的就是VFW，当然有这毛病了，换direct show试试吧，有开源库[/quote]
我需要用摄像头拍一张图片，请问有没有direct show这方面的资源，可不可发一份给我598115778@qq.com,，谢谢
泡泡龙 2014-08-12
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7楼的就是VFW，当然有这毛病了，换direct show试试吧，有开源库
ZhongGuanYao 2014-08-12
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我也遇到这个问题，在网上找了很多资料都没解决
刚测试一下7楼的代码，也有这个问题，是不是跟系统有关呢，我用的是win7系统
希望有高手出来解决
mjp1234airen4385 2014-08-12
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百度 C# directshow，能找到一堆，找找DShowNET,这个类库。一般有示例代码的。
directShow是directX的一个子集。DirectX是微软对硬件设备提供直接访问的一组API接口。
以前编写游戏，一般使用DirectX和OpenGL，以获得对设备的直接访问，加快游戏速度和更好的显示效果。
Ki1381 2014-08-09
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关注一下，很快也要用到
save4me 2014-08-09
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好像没有碰到过弹出对话框的情况
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;
//添加引用
using System.Runtime.InteropServices;
using System.Drawing.Imaging;
namespace VideoCam
{
public partial class WebCam : Form
{
WebCamera wc;
//声明一个API函数
[System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]
private static extern bool BitBlt(
IntPtr hdcDest, // 目标 DC的句柄
int nXDest,
int nYDest,
int nWidth,
int nHeight,
IntPtr hdcSrc, // 源DC的句柄
int nXSrc,
int nYSrc,
System.Int32 dwRop // 光栅的处理数值
);
public WebCam()
{
InitializeComponent();
}
private void btnPlay_Click(object sender, EventArgs e)
{
btnPlay.Enabled = false;
btnStop.Enabled = true;
//panelPreview.Size = new Size(330, 330);
wc = new WebCamera(panelPreview.Handle, panelPreview.Width, panelPreview.Height);
wc.StartWebCam();
}
private void WebCam_Load(object sender, EventArgs e)
{
btnPlay.Enabled = false;
btnStop.Enabled = true;
//panelPreview.Size = new Size(330, 330);
wc = new WebCamera(panelPreview.Handle, panelPreview.Width, panelPreview.Height);
wc.StartWebCam();
}
private void btnStop_Click(object sender, EventArgs e)
{
btnPlay.Enabled = true;
btnStop.Enabled = false;
wc.CloseWebcam();
}
private void btnPhoto_Click(object sender, EventArgs e)
{
//创建一个以当前控件区域屏幕为模板的图象
Graphics gPanel = this.panelPreview.CreateGraphics();
Bitmap bmSave = new Bitmap(this.panelPreview.Width, this.panelPreview.Height); //用于保存图片的位图对象
Graphics gSave = Graphics.FromImage(bmSave);
//得到屏幕的DC
IntPtr dcPanel = gPanel.GetHdc();
//得到Bitmap的DC
IntPtr dcSave = gSave.GetHdc();
//调用此API函数，实现屏幕捕获
BitBlt(dcSave, 0, 0, this.panelPreview.Width, this.panelPreview.Height, dcPanel, 0, 0, 13369376);
//释放掉屏幕的DC
gPanel.ReleaseHdc(dcPanel);
//释放掉Bitmap的DC
gSave.ReleaseHdc(dcSave);
//以JPG文件格式来保存
bmSave.Save(@"D:/Photo.jpg", ImageFormat.Jpeg);
MessageBox.Show("当前图像已经保存为D盘Photo文件！");
}
}
//show Video class
public class showVideo
{
// showVideo calls
[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);
[DllImport("User32.dll")]
public static extern bool SendMessage(IntPtr hWnd, int wMsg, short wParam, FrameEventHandler lParam);
[DllImport("User32.dll")]
public static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, ref BITMAPINFO lParam);
[DllImport("User32.dll")]
public static extern int SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int x, int y, int cx, int cy, int wFlags);
[DllImport("avicap32.dll")]
public static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize );
// Constants
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;
// Structures
[StructLayout(LayoutKind.Sequential)] public struct VIDEOHDR
{
[MarshalAs(UnmanagedType.I4)] public int lpData;
[MarshalAs(UnmanagedType.I4)] public int dwBufferLength;
[MarshalAs(UnmanagedType.I4)] public int dwBytesUsed;
[MarshalAs(UnmanagedType.I4)] public int dwTimeCaptured;
[MarshalAs(UnmanagedType.I4)] public int dwUser;
[MarshalAs(UnmanagedType.I4)] public int dwFlags;
[MarshalAs(UnmanagedType.ByValArray, SizeConst=4)] public int[] dwReserved;
}
[StructLayout(LayoutKind.Sequential)] public struct BITMAPINFOHEADER
{
[MarshalAs(UnmanagedType.I4)] public Int32 biSize ;
[MarshalAs(UnmanagedType.I4)] public Int32 biWidth ;
[MarshalAs(UnmanagedType.I4)] public Int32 biHeight ;
[MarshalAs(UnmanagedType.I2)] public short biPlanes;
[MarshalAs(UnmanagedType.I2)] public short biBitCount ;
[MarshalAs(UnmanagedType.I4)] public Int32 biCompression;
[MarshalAs(UnmanagedType.I4)] public Int32 biSizeImage;
[MarshalAs(UnmanagedType.I4)] public Int32 biXPelsPerMeter;
[MarshalAs(UnmanagedType.I4)] public Int32 biYPelsPerMeter;
[MarshalAs(UnmanagedType.I4)] public Int32 biClrUsed;
[MarshalAs(UnmanagedType.I4)] public Int32 biClrImportant;
}
[StructLayout(LayoutKind.Sequential)] public struct BITMAPINFO
{
[MarshalAs(UnmanagedType.Struct, SizeConst=40)] public BITMAPINFOHEADER bmiHeader;
[MarshalAs(UnmanagedType.ByValArray, SizeConst=1024)] public Int32[] bmiColors;
}
public delegate void FrameEventHandler(IntPtr lwnd, IntPtr lpVHdr);
// Public methods
public static object GetStructure(IntPtr ptr,ValueType structure)
{
return Marshal.PtrToStructure(ptr,structure.GetType());
}
public static object GetStructure(int ptr,ValueType structure)
{
return GetStructure(new IntPtr(ptr),structure);
}
public static void Copy(IntPtr ptr,byte[] data)
{
Marshal.Copy(ptr,data,0,data.Length);
}
public static void Copy(int ptr,byte[] data)
{
Copy(new IntPtr(ptr),data);
}
public static int SizeOf(object structure)
{
return Marshal.SizeOf(structure);
}
}
//Web Camera Class
public class WebCamera
{
// Constructur
public WebCamera(IntPtr handle, int width,int height)
{
mControlPtr = handle;
mWidth = width;
mHeight = height;
}
// delegate for frame callback
public delegate void RecievedFrameEventHandler(byte[] data);
public event RecievedFrameEventHandler RecievedFrame;
private IntPtr lwndC; // Holds the unmanaged handle of the control
private IntPtr mControlPtr; // Holds the managed pointer of the control
private int mWidth;
private int mHeight;
private showVideo.FrameEventHandler mFrameEventHandler; // Delegate instance for the frame callback - must keep alive! gc should NOT collect it
// Close the web camera
public void CloseWebcam()
{
this.capDriverDisconnect(this.lwndC);
}
// start the web camera
public void StartWebCam()
{
byte[] lpszName = new byte[100];
byte[] lpszVer = new byte[100];
showVideo.capGetDriverDescriptionA(0, lpszName, 100,lpszVer, 100);
this.lwndC = showVideo.capCreateCaptureWindowA(lpszName, showVideo.WS_VISIBLE + showVideo.WS_CHILD, 0, 0, mWidth, mHeight, mControlPtr, 0);
if (this.capDriverConnect(this.lwndC, 0))
{
this.capPreviewRate(this.lwndC, 66);
this.capPreview(this.lwndC, true);
showVideo.BITMAPINFO bitmapinfo = new showVideo.BITMAPINFO();
bitmapinfo.bmiHeader.biSize = showVideo.SizeOf(bitmapinfo.bmiHeader);
bitmapinfo.bmiHeader.biWidth = 352;
bitmapinfo.bmiHeader.biHeight = 288;
bitmapinfo.bmiHeader.biPlanes = 1;
bitmapinfo.bmiHeader.biBitCount = 24;
this.capSetVideoFormat(this.lwndC, ref bitmapinfo, showVideo.SizeOf(bitmapinfo));
this.mFrameEventHandler = new showVideo.FrameEventHandler(FrameCallBack);
this.capSetCallbackOnFrame(this.lwndC, this.mFrameEventHandler);
showVideo.SetWindowPos(this.lwndC, 0, 0, 0, mWidth , mHeight , 6);
}
}
// private functions
private bool capDriverConnect(IntPtr lwnd, short i)
{
return showVideo.SendMessage(lwnd, showVideo.WM_CAP_DRIVER_CONNECT, i, 0);
}
private bool capDriverDisconnect(IntPtr lwnd)
{
return showVideo.SendMessage(lwnd, showVideo.WM_CAP_DRIVER_DISCONNECT, 0, 0);
}
private bool capPreview(IntPtr lwnd, bool f)
{
return showVideo.SendMessage(lwnd, showVideo.WM_CAP_SET_PREVIEW , f, 0);
}
private bool capPreviewRate(IntPtr lwnd, short wMS)
{
return showVideo.SendMessage(lwnd, showVideo.WM_CAP_SET_PREVIEWRATE, wMS, 0);
}
private bool capSetCallbackOnFrame(IntPtr lwnd, showVideo.FrameEventHandler lpProc)
{
return showVideo.SendMessage(lwnd, showVideo.WM_CAP_SET_CALLBACK_FRAME, 0, lpProc);
}
private bool capSetVideoFormat(IntPtr hCapWnd, ref showVideo.BITMAPINFO BmpFormat, int CapFormatSize)
{
return showVideo.SendMessage(hCapWnd, showVideo.WM_CAP_SET_VIDEOFORMAT, CapFormatSize, ref BmpFormat);
}
private void FrameCallBack(IntPtr lwnd, IntPtr lpVHdr)
{
showVideo.VIDEOHDR videoHeader = new showVideo.VIDEOHDR();
byte[] VideoData;
videoHeader = (showVideo.VIDEOHDR)showVideo.GetStructure(lpVHdr,videoHeader);
VideoData = new byte[videoHeader.dwBytesUsed];
showVideo.Copy(videoHeader.lpData ,VideoData);
if (this.RecievedFrame != null)
this.RecievedFrame (VideoData);
}
}
}
会飞的溜溜 2014-08-08
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http://download.csdn.net/download/guqiwei/2844944
北京大白兔 2014-08-08
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好陌生的directShow，大哥哥有代码啵
mjp1234airen4385 2014-08-08
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这个情况是因为，你们调用的类库都是系统类库。
而系统类库里就有个功能，是多个视频或图片采集源的话，就弹出选择对话框。
你还是使用directShow来做，directshow自动捕捉采集源，以文本的形式提供给调用者。
你自己可以用程序自己选择某个固定的采集源。
北京大白兔 2014-08-08
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好像网上有很多人问，从来没有给过答案，我也碰到这个问题了，愁死我了
北京大白兔 2014-08-08
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USB免驱动，不是用VFW写的，是正常的winform
泡泡龙 2014-08-08
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是不是用VFW写的，别用这个了
要不你就换个驱动
