Hallo,
Also so lasse ich mir meine Webcam in PictureBox2 anzeigen:
Spoiler anzeigen
Soweit klappt alles wunderbar. Ich nutze die DirectShow Lib um die Webcam anzusprechen.
Nun würde ich gerne einen Schnappschuss machen.
Doch ich bekomme diesen Fehler:
Kann mir jemand helfen, das ich den Schanppschuss machen kann?
Weil ich weiß nicht wie ich das hinkriegen soll...? ;o
Also so lasse ich mir meine Webcam in PictureBox2 anzeigen:
VB.NET-Quellcode
- 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) Handles Me.FormClosing
- closeinterfaces()
- 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
- Public Sub GrabImage()
- '
- ' Get image from clipboard and convert it to a bitmap
- Try
- MediaControl.Pause()
- Clipboard.SetImage(PictureBox1.Image)
- '
- If Clipboard.ContainsImage Then
- PictureBox2.Image = Clipboard.GetImage()
- End If
- Catch
- End Try
- End Sub
- Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
- MediaControl.Run()
- End Sub
- End Class
Soweit klappt alles wunderbar. Ich nutze die DirectShow Lib um die Webcam anzusprechen.
Nun würde ich gerne einen Schnappschuss machen.
Doch ich bekomme diesen Fehler:
Kann mir jemand helfen, das ich den Schanppschuss machen kann?
Weil ich weiß nicht wie ich das hinkriegen soll...? ;o
C# Developer
Learning C++
Learning C++
