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[3aaBrSbeel]

Hey, I'm 3aaBrSbeel. This topic will lead us on making a PictureBox WebCam Capture. Which is a very Handy Tool. Easy to make and quite usefull.

What you need is:
PictureBox
Listbox
3 Buttons
& a SaveFileDialog

Lets get crackin'

Name them as following:
Button1 - btnStart
Button2 - btnStop
Button3 - btnSave
PictureBox - picCapture
Listbox - lstDevices
SaveFileDialog - sfdImage

PictureBox - Set it to "Stretch Image"
Form - Set it to "AutoScroll - True"
SaveFileDialog - Filter " PNG File (*.png)|*.png "


It should look like this..

Untitled.png

Let's Start Coding!

Type the Following. Below the Public Class Form1

Code: Select all

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
    Dim hHwnd As Integer
    Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Integer, ByVal wMsg As Integer, ByVal wParam As Integer, 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 LoadDeviceList()
        Dim strName As String = Space(100)
        Dim strVer As String = Space(100)
        Dim bReturn As Boolean
        Dim x As Integer = 0
        Do
            bReturn = capGetDriverDescriptionA(x, strName, 100, strVer, 100)
            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
        hHwnd = capCreateCaptureWindowA(iDevice, WS_VISIBLE Or WS_CHILD, 0, 0, 640, 480, picCapture.Handle.ToInt32, 0)
        If SendMessage(hHwnd, WM_CAP_DRIVER_CONNECT, iDevice, 0) Then
            SendMessage(hHwnd, WM_CAP_SET_SCALE, True, 0)
            SendMessage(hHwnd, WM_CAP_SET_PREVIEWRATE, 66, 0)
            SendMessage(hHwnd, WM_CAP_SET_PREVIEW, True, 0)
            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
            DestroyWindow(hHwnd)
            btnSave.Enabled = False
        End If
    End Sub

For Button3 (Save Button) which is "btnSave" Codes:

Code: Select all

Dim data As IDataObject
        Dim bmap As Image
        SendMessage(hHwnd, WM_CAP_EDIT_COPY, 0, 0)
        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 ClosePreviewWindow()
        SendMessage(hHwnd, WM_CAP_DRIVER_DISCONNECT, iDevice, 0)
        DestroyWindow(hHwnd)
    End Sub

For Form1_Load Codes:

Code: Select all

LoadDeviceList()

For Button1 (Start button) which is "btnStart" Codes:

Code: Select all

OpenPreviewWindow()
        btnStart.Enabled = False
        btnStop.Enabled = True
    End Sub

And the Last is Button2 (Stop button) which is "btnStop" Codes:

Code: Select all

ClosePreviewWindow()
        btnStart.Enabled = True
        btnStop.Enabled = False
    End Sub
End Class

This ends it. Have fun taking pictures! P.E.A.C.E.!.

Credits to Lobster Productions

http://lobsterproductions.weebly.com

[pip]

I feel like i have seen this alot before but good tutorial thanks for reposting here if i have it can be coded differently and it can be useful for certain things !

Edit: found it here real credits to lobster productions exact same one it looks like
you could at least give credits... How to Make a WebCam Picture Tool in Visual Basic 2008/2010. http://www.youtube.com/watch?v=-dMQNlrkGWQ

[Shim]

i saw many tutorial on this topic here . I dont think this is a copied so thanks for posting and you can add more features like record to video and save it as avi

[3aaBrSbeel]

I added the Credits.

And Thanks

[Molegulas]

Nice this program But later I use one time, BANG!! I can't use again, and I don't know how to fix this :'(