Capture Video

This program shows how to capture live video from a web cam and display it in a picture box.

Option Explicit

Const ws_visible = &H10000000
Const ws_child = &H40000000
Const WM_USER = 1024
Const WM_CAP_EDIT_COPY = WM_USER + 30
Const wm_cap_driver_connect = WM_USER + 10
Const wm_cap_set_preview = WM_USER + 50
Const wm_cap_set_overlay = WM_USER + 51
Const WM_CAP_SET_PREVIEWRATE = WM_USER + 52
Const WM_CAP_SEQUENCE = WM_USER + 62
Const WM_CAP_SINGLE_FRAME_OPEN = WM_USER + 70
Const WM_CAP_SINGLE_FRAME_CLOSE = WM_USER + 71
Const WM_CAP_SINGLE_FRAME = WM_USER + 72
Const DRV_USER = &H4000
Const DVM_DIALOG = DRV_USER + 100
Const PREVIEWRATE = 30

Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Private Declare Function capCreateCaptureWindow Lib "avicap32.dll" Alias "capCreateCaptureWindowA" (ByVal a As String, ByVal b As Long, ByVal c As Integer, ByVal d As Integer, ByVal e As Integer, ByVal f As Integer, ByVal g As Long, ByVal h As Integer) As Long

Dim hwndc As Long
Dim saveflag As Integer
Dim pictureindex As Integer
Dim filter1(-1 To 1, -1 To 1) As Single
Dim filter2(-1 To 1, -1 To 1) As Single
Dim temp As String

Private Sub Command2_Click()
   Unload Me
End Sub

Private Sub Form_Load()
On Error GoTo handler:
   hwndc = capCreateCaptureWindow("CaptureWindow", ws_child Or ws_visible, 0, 0, PichWnd.Width, PichWnd.Height, PichWnd.hWnd, 0)
   If (hwndc <> 0) Then
       temp = SendMessage(hwndc, wm_cap_driver_connect, 0, 0)
       temp = SendMessage(hwndc, wm_cap_set_preview, 1, 0)
       temp = SendMessage(hwndc, WM_CAP_SET_PREVIEWRATE, PREVIEWRATE, 0)

       temp = SendMessage(Me.hWnd, WM_CAP_EDIT_COPY, 1, 0)
       Picture1.Picture = Clipboard.GetData
   Else
       MsgBox "Unable to capture video.", vbCritical
   End If
Exit Sub
handler:
End
End Sub

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