Este es el código que anda mas o menos, en vista por lo menos, no anda la
"Preview", pero si anda cuando le doy "grabar imagen", se ve la ultima imagen
capturada. cuando le doy stop preview tambien se ve la ultima, pero cuando
pongo start preview se ve todo negro. La camara enciende... Agradeceria si me
pueden ayudar.
Imports System.Runtime.InteropServices
Public Class Form1
Inherits System.Windows.Forms.Form
#Region " Windows Form Designer generated code "
Public Sub New()
MyBase.New()
'This call is required by the Windows Form Designer.
InitializeComponent()
'Add any initialization after the InitializeComponent() call
End Sub
'Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer
'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
Friend WithEvents picCapture As System.Windows.Forms.PictureBox
Friend WithEvents lstDevices As System.Windows.Forms.ListBox
Friend WithEvents lblDevice As System.Windows.Forms.Label
Friend WithEvents btnStart As System.Windows.Forms.Button
Friend WithEvents btnSave As System.Windows.Forms.Button
Friend WithEvents btnStop As System.Windows.Forms.Button
Friend WithEvents Timer1 As System.Windows.Forms.Timer
Friend WithEvents sfdImage As System.Windows.Forms.SaveFileDialog
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.components = New System.ComponentModel.Container
Me.picCapture = New System.Windows.Forms.PictureBox
Me.lstDevices = New System.Windows.Forms.ListBox
Me.lblDevice = New System.Windows.Forms.Label
Me.btnStart = New System.Windows.Forms.Button
Me.btnSave = New System.Windows.Forms.Button
Me.btnStop = New System.Windows.Forms.Button
Me.sfdImage = New System.Windows.Forms.SaveFileDialog
Me.Timer1 = New System.Windows.Forms.Timer(Me.components)
CType(Me.picCapture,
System.ComponentModel.ISupportInitialize).BeginInit()
Me.SuspendLayout()
'
'picCapture
'
Me.picCapture.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
Me.picCapture.Location = New System.Drawing.Point(208, 24)
Me.picCapture.Name = "picCapture"
Me.picCapture.Size = New System.Drawing.Size(256, 272)
Me.picCapture.TabIndex = 0
Me.picCapture.TabStop = False
'
'lstDevices
'
Me.lstDevices.Location = New System.Drawing.Point(8, 55)
Me.lstDevices.Name = "lstDevices"
Me.lstDevices.Size = New System.Drawing.Size(184, 238)
Me.lstDevices.TabIndex = 1
'
'lblDevice
'
Me.lblDevice.Location = New System.Drawing.Point(8, 32)
Me.lblDevice.Name = "lblDevice"
Me.lblDevice.Size = New System.Drawing.Size(184, 16)
Me.lblDevice.TabIndex = 2
Me.lblDevice.Text = "Available Devices"
Me.lblDevice.TextAlign = System.Drawing.ContentAlignment.TopCenter
'
'btnStart
'
Me.btnStart.Location = New System.Drawing.Point(20, 320)
Me.btnStart.Name = "btnStart"
Me.btnStart.Size = New System.Drawing.Size(112, 32)
Me.btnStart.TabIndex = 3
Me.btnStart.Text = "Start Preview"
'
'btnSave
'
Me.btnSave.Anchor = CType((System.Windows.Forms.AnchorStyles.Bottom Or
System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
Me.btnSave.Location = New System.Drawing.Point(348, 320)
Me.btnSave.Name = "btnSave"
Me.btnSave.Size = New System.Drawing.Size(112, 32)
Me.btnSave.TabIndex = 4
Me.btnSave.Text = "Save Image"
'
'btnStop
'
Me.btnStop.Location = New System.Drawing.Point(184, 320)
Me.btnStop.Name = "btnStop"
Me.btnStop.Size = New System.Drawing.Size(112, 32)
Me.btnStop.TabIndex = 5
Me.btnStop.Text = "Stop Preview"
'
'sfdImage
'
Me.sfdImage.FileName = "Webcam1"
Me.sfdImage.Filter = "Bitmap|*.bmp"
'
'Timer1
'
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(480, 382)
Me.Controls.Add(Me.btnStop)
Me.Controls.Add(Me.btnSave)
Me.Controls.Add(Me.btnStart)
Me.Controls.Add(Me.lblDevice)
Me.Controls.Add(Me.lstDevices)
Me.Controls.Add(Me.picCapture)
Me.Name = "Form1"
Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
Me.Text = "Video Capture"
CType(Me.picCapture, System.ComponentModel.ISupportInitialize).EndInit()
Me.ResumeLayout(False)
End Sub
#End Region
Const WM_CAP As Short = &H400S
Const WM_CAP_DRIVER_CONNECT As Integer = WM_CAP + 10
Const WM_CAP_DRIVER_DISCONNECT As Integer = WM_CAP + 11
Const WM_CAP_EDIT_COPY As Integer = WM_CAP + 30
Const WM_CAP_SET_PREVIEW As Integer = WM_CAP + 50
Const WM_CAP_SET_PREVIEWRATE As Integer = WM_CAP + 52
Const WM_CAP_SET_SCALE As Integer = WM_CAP + 53
Const WS_CHILD As Integer = &H40000000
Const WS_VISIBLE As Integer = &H10000000
Const SWP_NOMOVE As Short = &H2S
Const SWP_NOSIZE As Short = 1
Const SWP_NOZORDER As Short = &H4S
Const HWND_BOTTOM As Short = 1
Dim iDevice As Integer = 0 ' Current device ID
Dim hHwnd As Integer ' Handle to preview window
Declare Function SendMessage Lib "user32" Alias "SendMessageA" _
(ByVal hwnd As Integer, ByVal wMsg As Integer, ByVal wParam As Integer,
_
<MarshalAs(UnmanagedType.AsAny)> ByVal lParam As Object) As Integer
Declare Function SetWindowPos Lib "user32" Alias "SetWindowPos" (ByVal hwnd
As Integer, _
ByVal hWndInsertAfter As Integer, ByVal x As Integer, ByVal y As
Integer, _
ByVal cx As Integer, ByVal cy As Integer, ByVal wFlags As Integer) As
Integer
Declare Function DestroyWindow Lib "user32" (ByVal hndw As Integer) As
Boolean
Declare Function capCreateCaptureWindowA Lib "avicap32.dll" _
(ByVal lpszWindowName As String, ByVal dwStyle As Integer, _
ByVal x As Integer, ByVal y As Integer, ByVal nWidth As Integer, _
ByVal nHeight As Short, ByVal hWndParent As Integer, _
ByVal nID As Integer) As Integer
Declare Function capGetDriverDescriptionA Lib "avicap32.dll" (ByVal wDriver
As Short, _
ByVal lpszName As String, ByVal cbName As Integer, ByVal lpszVer As
String, _
ByVal cbVer As Integer) As Boolean
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
LoadDeviceList()
If lstDevices.Items.Count > 0 Then
btnStart.Enabled = True
lstDevices.SelectedIndex = 0
btnStart.Enabled = True
Else
lstDevices.Items.Add("No Capture Device")
btnStart.Enabled = False
End If
btnStop.Enabled = False
btnSave.Enabled = False
picCapture.SizeMode = PictureBoxSizeMode.StretchImage
End Sub
Private Sub LoadDeviceList()
Dim strName As String = Space(100)
Dim strVer As String = Space(100)
Dim bReturn As Boolean
Dim x As Integer = 0
'
' Load name of all avialable devices into the lstDevices
'
Do
'
' Get Driver name and version
'
bReturn = capGetDriverDescriptionA(x, strName, 100, strVer, 100)
'
' If there was a device add device name to the list
'
If bReturn Then lstDevices.Items.Add(strName.Trim)
x += 1
Loop Until bReturn = False
End Sub
Private Sub OpenPreviewWindow()
Dim iHeight As Integer = picCapture.Height
Dim iWidth As Integer = picCapture.Width
'
' Open Preview window in picturebox
'
hHwnd = capCreateCaptureWindowA(iDevice, WS_VISIBLE Or WS_CHILD, 0, 0,
640, _
480, picCapture.Handle.ToInt32, 0)
'
' Connect to device
'
If SendMessage(hHwnd, WM_CAP_DRIVER_CONNECT, iDevice, 0) Then
'
'Set the preview scale
'
SendMessage(hHwnd, WM_CAP_SET_SCALE, True, 0)
'
'Set the preview rate in milliseconds
'
SendMessage(hHwnd, WM_CAP_SET_PREVIEWRATE, 66, 0)
'
'Start previewing the image from the camera
'
SendMessage(hHwnd, WM_CAP_SET_PREVIEW, True, 0)
'
' Resize window to fit in picturebox
'
SetWindowPos(hHwnd, HWND_BOTTOM, 0, 0, picCapture.Width,
picCapture.Height, _
SWP_NOMOVE Or SWP_NOZORDER)
btnSave.Enabled = True
btnStop.Enabled = True
btnStart.Enabled = False
Else
'
' Error connecting to device close window
'
DestroyWindow(hHwnd)
btnSave.Enabled = False
End If
End Sub
Private Sub btnStart_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles btnStart.Click
iDevice = lstDevices.SelectedIndex
OpenPreviewWindow()
Timer1.Enabled = True
End Sub
Private Sub ClosePreviewWindow()
'
' Disconnect from device
'
SendMessage(hHwnd, WM_CAP_DRIVER_DISCONNECT, iDevice, 0)
'
' close window
'
DestroyWindow(hHwnd)
End Sub
Private Sub btnStop_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles btnStop.Click
ClosePreviewWindow()
btnSave.Enabled = False
btnStart.Enabled = True
btnStop.Enabled = False
End Sub
Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles btnSave.Click
Dim data As IDataObject
Dim bmap As Image
'
' Copy image to clipboard
'
SendMessage(hHwnd, WM_CAP_EDIT_COPY, 0, 0)
'
' Get image from clipboard and convert it to a bitmap
'
data = Clipboard.GetDataObject()
If data.GetDataPresent(GetType(System.Drawing.Bitmap)) Then
bmap = CType(data.GetData(GetType(System.Drawing.Bitmap)), Image)
picCapture.Image = bmap
ClosePreviewWindow()
btnSave.Enabled = False
btnStop.Enabled = False
btnStart.Enabled = True
If sfdImage.ShowDialog = DialogResult.OK Then
bmap.Save(sfdImage.FileName, Imaging.ImageFormat.Bmp)
End If
End If
End Sub
Private Sub Form1_Closing(ByVal sender As Object, ByVal e As
System.ComponentModel.CancelEventArgs) Handles MyBase.Closing
If btnStop.Enabled Then
ClosePreviewWindow()
End If
End Sub
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Timer1.Tick
Dim data As IDataObject
Dim bmap As Image
'
' Copy image to clipboard
'
SendMessage(hHwnd, WM_CAP_EDIT_COPY, 0, 0)
'
' Get image from clipboard and convert it to a bitmap
'
data = Clipboard.GetDataObject()
If data.GetDataPresent(GetType(System.Drawing.Bitmap)) Then
bmap = CType(data.GetData(GetType(System.Drawing.Bitmap)), Image)
picCapture.Image = bmap
End If
End Sub
End Class
--- El jue 4-jun-09, Walter Poch <[email protected]> escribió:
De: Walter Poch <[email protected]>
Asunto: [vbnet] WebCam en windows forms
Para: "vbnet List Member" <[email protected]>
Fecha: jueves, 4 de junio de 2009, 10:07 am
Hola Axel,
Yo justo este fin de semana que pasó me puse a “jugar” con esto.
Probé varios de los links que recopilé en: http://delicious.com/wpoch/webcam y
me
funcionaron bien en Windows Server 2008, así que en Vista deberían andar.
Saludos,
Walter G. Poch
Developer / Architect
ITX Corp.
--------------------------------------------
Cell: +54 (9 341) 3353273
24/7 Support (800)600-7785
--------------------------------------------
Skype: ITXWPoch
--------------------------------------------
Visit us at www.itx.net
1169 Pittsford-Victor Rd
Bldg. 3, Suite 100
Pittsford, NY 14534
[email protected]
From: [email protected]
[mailto:[email protected]] On Behalf Of Axel Kalbermatten
Sent: Thursday, June 04, 2009 1:15 AM
To: vbnet List Member
Subject: [vbnet] WebCam en windows forms
Hola, la cosa es así, tengo que proyectar una imagen en un
formulario en principio captada por la webcam, en un futuro la señal entrará
por una placa capturadora de TV, he probado unos cuantos ejemplos que
utilizan las apis de windows, pero ninguno funciona para windows vista, ya
que se ve todo en negro cuando compilo. Quisiera saber si alguien me puede
dar una mano con esto, desde ya muchas gracias.
Yahoo!
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