04-08-16, 02:13 AM
(آخر تعديل لهذه المشاركة : 04-08-16, 06:54 PM {2} بواسطة YazanOtoum.)
السلام عليكم
اخواني انا استخدمت كود حملته من الانترنت يقوم بتصوير الكام باستخدام مكتبة directshow والكود شغال تمام ولكن لحد الان ما اقدرت اعرف كيف ممكن احدد اسماء الكام المتصله بالجهاز واختيار كام معينه للتصوير .
الكود :
كود :
Imports DirectShowLib
Imports System
Imports System.Diagnostics
Imports System.Drawing
Imports System.Runtime.InteropServices
Imports System.Windows.Forms
Imports System.Runtime.InteropServices.ComTypes
Public Class Form1
Dim D As Integer = Convert.ToInt32("0X8000", 16)
Public WM_GRAPHNOTIFY As Integer = D + 1
Dim VideoWindow As IVideoWindow = Nothing
Dim MediaControl As IMediaControl = Nothing
Dim MediaEventEx As IMediaEventEx = Nothing
Dim GraphBuilder As IGraphBuilder = Nothing
Dim CaptureGraphBuilder As ICaptureGraphBuilder2 = Nothing
Enum PlayState
Stopped
Paused
Running
Init
End Enum
Dim CurrentState As PlayState = PlayState.Stopped
Dim rot As DsROTEntry = Nothing
Private Sub Form1_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs)
closeinterfaces()
End Sub
Private Sub Form1_FormClosed(sender As Object, e As FormClosedEventArgs) Handles Me.FormClosed
MediaControl.Stop()
End Sub
Private Sub Form1_FormClosing1(sender As Object, e As FormClosingEventArgs) Handles Me.FormClosing
MediaControl.Stop()
End Sub
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
CaptureVideo()
PictureBox1.Visible = True
End Sub
Private Sub CaptureVideo()
Dim hr As Integer = 0
Dim sourceFilter As IBaseFilter = Nothing
Try
GetInterfaces()
hr = CaptureGraphBuilder.SetFiltergraph(GraphBuilder) 'Specifies filter graph "graphbuilder" for the capture graph builder "captureGraphBuilder" to use.
sourceFilter = FindCaptureDevice()
hr = GraphBuilder.AddFilter(sourceFilter, "Video Capture")
hr = CaptureGraphBuilder.RenderStream(PinCategory.Preview, MediaType.Video, sourceFilter, Nothing, Nothing)
Marshal.ReleaseComObject(sourceFilter)
SetupVideoWindow()
rot = New DsROTEntry(GraphBuilder)
hr = MediaControl.Run()
CurrentState = PlayState.Running
Catch ex As Exception
MessageBox.Show("An unrecoverable error has occurred.With error : " & ex.ToString)
End Try
End Sub
Private Sub GetInterfaces()
Dim hr As Integer = 0
GraphBuilder = CType(New FilterGraph, IGraphBuilder)
CaptureGraphBuilder = CType(New CaptureGraphBuilder2, ICaptureGraphBuilder2)
MediaControl = CType(GraphBuilder, IMediaControl)
VideoWindow = CType(GraphBuilder, IVideoWindow)
MediaEventEx = CType(GraphBuilder, IMediaEventEx)
hr = MediaEventEx.SetNotifyWindow(Me.Handle, WM_GRAPHNOTIFY, IntPtr.Zero) 'This method designates a window as the recipient of messages generated by or sent to the current DirectShow object
End Sub
Public Function FindCaptureDevice() As IBaseFilter
Dim hr As Integer = 0
Dim classEnum As IEnumMoniker = Nothing
Dim moniker As IMoniker() = New IMoniker(0) {}
Dim source As Object = Nothing
Dim devEnum As ICreateDevEnum = CType(New CreateDevEnum, ICreateDevEnum)
hr = devEnum.CreateClassEnumerator(FilterCategory.VideoInputDevice, classEnum, 0)
Marshal.ReleaseComObject(devEnum)
If classEnum Is Nothing Then
Throw New ApplicationException("No video capture device was detected.\r\n\r\n" & _
"This sample requires a video capture device, such as a USB WebCam,\r\n" & _
"to be installed and working properly. The sample will now close.")
End If
If classEnum.Next(moniker.Length, moniker, IntPtr.Zero) = 0 Then
Dim iid As Guid = GetType(IBaseFilter).GUID
moniker(0).BindToObject(Nothing, Nothing, iid, source)
Else
Throw New ApplicationException("Unable to access video capture device!")
End If
Marshal.ReleaseComObject(moniker(0))
Marshal.ReleaseComObject(classEnum)
Return CType(source, IBaseFilter)
End Function
Public Sub SetupVideoWindow()
Dim hr As Integer = 0
'set the video window to be a child of the main window
'putowner : Sets the owning parent window for the video playback window.
hr = VideoWindow.put_Owner(PictureBox1.Handle) 'Me.Handle)
PictureBox1.Visible = False
hr = VideoWindow.put_WindowStyle(WindowStyle.Child Or WindowStyle.ClipChildren)
'Use helper function to position video window in client rect of main application window
ResizeVideoWindow()
'Make the video window visible, now that it is properly positioned
'put_visible : This method changes the visibility of the video window.
hr = VideoWindow.put_Visible(OABool.True)
End Sub
Public Sub ResizeVideoWindow()
'Resize the video preview window to match owner window size
'left , top , width , height
If Not (VideoWindow Is Nothing) Then 'if the videopreview is not nothing
VideoWindow.SetWindowPosition(0, 0, Me.Width, Me.ClientSize.Height)
End If
End Sub
Public Sub closeinterfaces()
'//stop previewing data
If Not (Me.MediaControl Is Nothing) Then
Me.MediaControl.StopWhenReady()
End If
Me.CurrentState = PlayState.Stopped
'//stop recieving events
If Not (Me.MediaEventEx Is Nothing) Then
Me.MediaEventEx.SetNotifyWindow(IntPtr.Zero, WM_GRAPHNOTIFY, IntPtr.Zero)
End If
'// Relinquish ownership (IMPORTANT!) of the video window.
'// Failing to call put_Owner can lead to assert failures within
'// the video renderer, as it still assumes that it has a valid
'// parent window.
If Not (Me.VideoWindow Is Nothing) Then
Me.VideoWindow.put_Visible(OABool.False)
Me.VideoWindow.put_Owner(IntPtr.Zero)
End If
' // Remove filter graph from the running object table
If Not (rot Is Nothing) Then
rot.Dispose()
rot = Nothing
End If
'// Release DirectShow interfaces
Marshal.ReleaseComObject(Me.MediaControl) : Me.MediaControl = Nothing
Marshal.ReleaseComObject(Me.MediaEventEx) : Me.MediaEventEx = Nothing
Marshal.ReleaseComObject(Me.VideoWindow) : Me.VideoWindow = Nothing
Marshal.ReleaseComObject(Me.GraphBuilder) : Me.GraphBuilder = Nothing
Marshal.ReleaseComObject(Me.CaptureGraphBuilder) : Me.CaptureGraphBuilder = Nothing
End Sub
Private Sub btnGrab_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
GrabImage()
End Sub
Public Sub GrabImage()
Try
MediaControl.Pause()
Dim bmp As New Bitmap(PictureBox1.Width, PictureBox1.Height)
Using g As Graphics = Graphics.FromImage(bmp)
Dim pt As Point = PictureBox1.PointToScreen(New Point(0, 0))
g.CopyFromScreen(pt.X, pt.Y, 0, 0, bmp.Size)
End Using
PictureBox2.Image = bmp
bmp.Save("D:\cam1\1.bmp")
MediaControl.Run()
Catch
End Try
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
GrabImage()
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
MediaControl.Stop()
End Sub
Private Sub Button3_Click(sender As Object, e As EventArgs)
End Sub
End Class
بالكود موجود function اسمه FindCaptureDevice حاولت احلله بس ما عرفت افهمه لانه مرتبط بمكتبة directshow
وحملت السورس بالمرفقات