（转）连接摄像头（vb）

Imports System
Imports System.Runtime.InteropServices
Imports System.Drawing
Imports System.Drawing.Imaging

Public Class Cam

Private Const WM_USER As Integer = &H400
Private Const WS_CHILD As Integer = &H40000000
Private Const WS_VISIBLE As Integer = &H10000000
Private Const WM_CAP_START As Integer = WM_USER
Private Const WM_CAP_STOP As Integer = WM_CAP_START + 68
Private Const WM_CAP_DRIVER_CONNECT As Integer = WM_CAP_START + 10
Private Const WM_CAP_DRIVER_DISCONNECT As Integer = WM_CAP_START + 11
Private Const WM_CAP_SAVEDIB As Integer = WM_CAP_START + 25
Private Const WM_CAP_GRAB_FRAME As Integer = WM_CAP_START + 60
Private Const WM_CAP_SEQUENCE As Integer = WM_CAP_START + 62
Private Const WM_CAP_FILE_SET_CAPTURE_FILEA As Integer = WM_CAP_START + 20
Private Const WM_CAP_SEQUENCE_NOFILE As Integer = WM_CAP_START + 63
Private Const WM_CAP_SET_OVERLAY As Integer = WM_CAP_START + 51
Private Const WM_CAP_SET_PREVIEW As Integer = WM_CAP_START + 50
Private Const WM_CAP_SET_CALLBACK_VIDEOSTREAM As Integer = WM_CAP_START + 6
Private Const WM_CAP_SET_CALLBACK_ERROR As Integer = WM_CAP_START + 2
Private Const WM_CAP_SET_CALLBACK_STATUSA As Integer = WM_CAP_START + 3
Private Const WM_CAP_SET_CALLBACK_FRAME As Integer = WM_CAP_START + 5
Private Const WM_CAP_SET_SCALE As Integer = WM_CAP_START + 53
Private Const WM_CAP_SET_PREVIEWRATE As Integer = WM_CAP_START + 52

Public Const WM_CAP_GET_CAPSTREAMPTR = WM_CAP_START + 1

Public Const WM_CAP_SET_CALLBACK_STATUS = WM_CAP_START + 3
Public Const WM_CAP_SET_CALLBACK_YIELD = WM_CAP_START + 4
Public Const WM_CAP_SET_CALLBACK_WAVESTREAM = WM_CAP_START + 7
Public Const WM_CAP_GET_USER_DATA = WM_CAP_START + 8
Public Const WM_CAP_SET_USER_DATA = WM_CAP_START + 9

Public Const WM_CAP_DRIVER_GET_NAME = WM_CAP_START + 12
Public Const WM_CAP_DRIVER_GET_VERSION = WM_CAP_START + 13
Public Const WM_CAP_DRIVER_GET_CAPS = WM_CAP_START + 14

Public Const WM_CAP_FILE_SET_CAPTURE_FILE = WM_CAP_START + 20
Public Const WM_CAP_FILE_GET_CAPTURE_FILE = WM_CAP_START + 21
Public Const WM_CAP_FILE_ALLOCATE = WM_CAP_START + 22
Public Const WM_CAP_FILE_SAVEAS = WM_CAP_START + 23
Public Const WM_CAP_FILE_SET_INFOCHUNK = WM_CAP_START + 24
Public Const WM_CAP_FILE_SAVEDIB = WM_CAP_START + 25

Public Const WM_CAP_EDIT_COPY = WM_CAP_START + 30

Public Const WM_CAP_SET_AUDIOFORMAT = WM_CAP_START + 35
Public Const WM_CAP_GET_AUDIOFORMAT = WM_CAP_START + 36

Public Const WM_CAP_DLG_VIDEOFORMAT = WM_CAP_START + 41
Public Const WM_CAP_DLG_VIDEOSOURCE = WM_CAP_START + 42
Public Const WM_CAP_DLG_VIDEODISPLAY = WM_CAP_START + 43
Public Const WM_CAP_GET_VIDEOFORMAT = WM_CAP_START + 44
Public Const WM_CAP_SET_VIDEOFORMAT = WM_CAP_START + 45
Public Const WM_CAP_DLG_VIDEOCOMPRESSION = WM_CAP_START + 46

Public Const WM_CAP_GET_STATUS = WM_CAP_START + 54
Public Const WM_CAP_SET_SCROLL = WM_CAP_START + 55

Public Const WM_CAP_GRAB_FRAME_NOSTOP = WM_CAP_START + 61

Public Const WM_CAP_SET_SEQUENCE_SETUP = WM_CAP_START + 64
Public Const WM_CAP_GET_SEQUENCE_SETUP = WM_CAP_START + 65
Public Const WM_CAP_SET_MCI_DEVICE = WM_CAP_START + 66
Public Const WM_CAP_GET_MCI_DEVICE = WM_CAP_START + 67
Public Const WM_CAP_ABORT = WM_CAP_START + 69

Public Const WM_CAP_SINGLE_FRAME_OPEN = WM_CAP_START + 70
Public Const WM_CAP_SINGLE_FRAME_CLOSE = WM_CAP_START + 71
Public Const WM_CAP_SINGLE_FRAME = WM_CAP_START + 72

Public Const WM_CAP_PAL_OPEN = WM_CAP_START + 80
Public Const WM_CAP_PAL_SAVE = WM_CAP_START + 81
Public Const WM_CAP_PAL_PASTE = WM_CAP_START + 82
Public Const WM_CAP_PAL_AUTOCREATE = WM_CAP_START + 83
Public Const WM_CAP_PAL_MANUALCREATE = WM_CAP_START + 84

'// Following added post VFW 1.1
Public Const WM_CAP_SET_CALLBACK_CAPCONTROL = WM_CAP_START + 85

'// Defines end of the message range
Public Const WM_CAP_END = WM_CAP_SET_CALLBACK_CAPCONTROL

Private hWndC As IntPtr
Private bStat As Boolean = False

Private mControlPtr As IntPtr
Private mWidth As Integer
Private mHeight As Integer
Private mLeft As Integer
Private mTop As Integer

<DllImport("avicap32.dll")> _
Private Shared Function capCreateCaptureWindowA(ByVal lpszWindowName() As Byte,ByVal dwStyle As Integer,ByVal x As Integer,ByVal y As Integer,ByVal nWidth As Integer,ByVal nHeight As Integer,ByVal hWndParent As IntPtr,ByVal nID As Integer) As IntPtr
End Function

<DllImport("avicap32.dll")> _
Private Shared Function capGetVideoFormat(ByVal hWnd As IntPtr,ByVal psVideoFormat As IntPtr,ByVal wSize As Integer) As Integer
End Function

<DllImport("User32.dll")> _
Private Shared Function SendMessage(ByVal hWnd As IntPtr,ByVal wMsg As Integer,ByVal wParam As Integer,ByVal lParam As Long) As Boolean
End Function

Function capDlgVideoFormat() As Boolean
capDlgVideoFormat = SendMessage(hWndC,WM_CAP_DLG_VIDEOFORMAT,0)
End Function
Function capDlgVideoSource() As Boolean
capDlgVideoSource = SendMessage(hWndC,WM_CAP_DLG_VIDEOSOURCE,0)
End Function
Function capDlgVideoDisplay() As Boolean
capDlgVideoDisplay = SendMessage(hWndC,WM_CAP_DLG_VIDEODISPLAY,0)
End Function
Function capDlgVideoCompression() As Boolean
capDlgVideoCompression = SendMessage(hWndC,WM_CAP_DLG_VIDEOCOMPRESSION,0)
End Function

'/// <summary> '/// 初始化摄像头 '/// </summary> '/// <param name="handle">控件的句柄</param> '/// <param name="left">开始显示的左边距</param> '/// <param name="top">开始显示的上边距</param> '/// <param name="width">要显示的宽度</param> '/// <param name="height">要显示的长度</param> Public Sub New(ByVal handle As IntPtr,ByVal left As Integer,ByVal top As Integer,ByVal width As Integer,ByVal height As Integer) mControlPtr = handle mWidth = width mHeight = height mLeft = left mTop = top End Sub '/// <summary> '/// 开始显示图像 '/// </summary> Public Sub Start() If bStat Then Return End If bStat = True Dim lpszName(99) As Byte hWndC = capCreateCaptureWindowA(lpszName,WS_CHILD Or WS_VISIBLE,mLeft,mTop,mWidth,mHeight,mControlPtr,0) If hWndC.ToInt32() <> 0 Then SendMessage(hWndC,WM_CAP_SET_CALLBACK_VIDEOSTREAM,0) SendMessage(hWndC,WM_CAP_SET_CALLBACK_ERROR,WM_CAP_SET_CALLBACK_STATUSA,WM_CAP_DRIVER_CONNECT,WM_CAP_SET_SCALE,1,WM_CAP_SET_PREVIEWRATE,66,WM_CAP_SET_OVERLAY,WM_CAP_SET_PREVIEW,0) End If Return End Sub '/// <summary> '/// 停止显示 '/// </summary> Public Sub [Stop]() SendMessage(hWndC,WM_CAP_DRIVER_DISCONNECT,0) bStat = False End Sub '/// <summary> '/// 抓图 '/// </summary> '/// <param name="path">要保存bmp文件的路径</param> Public Sub GrabImage(ByVal path As String) Dim hBmp As IntPtr = Marshal.StringToHGlobalAnsi(path) SendMessage(hWndC,WM_CAP_SAVEDIB,hBmp.ToInt64()) End Sub '/// <summary> '/// 录像 '/// </summary> '/// <param name="path">要保存avi文件的路径</param> Public Sub Kinescope(ByVal path As String) Dim hBmp As IntPtr = Marshal.StringToHGlobalAnsi(path) SendMessage(hWndC,WM_CAP_FILE_SET_CAPTURE_FILEA,hBmp.ToInt64()) SendMessage(hWndC,WM_CAP_SEQUENCE,0) End Sub '/// <summary> '/// 停止录像 '/// </summary> Public Sub StopKinescope() SendMessage(hWndC,WM_CAP_STOP,0) End Sub End Class下面这个是测试窗体Form1.vb: Public Class Form1 Inherits System.Windows.Forms.Form Private cccap As Cam #Region " Windows 窗体设计器生成的代码 " Public Sub New() MyBase.New() '该调用是 Windows 窗体设计器所必需的。 InitializeComponent() '在 InitializeComponent() 调用之后添加任何初始化 End Sub '窗体重写 dispose 以清理组件列表。 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 'Windows 窗体设计器所必需的 Private components As System.ComponentModel.IContainer '注意: 以下过程是 Windows 窗体设计器所必需的 '可以使用 Windows 窗体设计器修改此过程。 '不要使用代码编辑器修改它。 Friend WithEvents Button1 As System.Windows.Forms.Button Friend WithEvents picView As System.Windows.Forms.PictureBox Friend WithEvents Button2 As System.Windows.Forms.Button Friend WithEvents Button3 As System.Windows.Forms.Button Friend WithEvents Button4 As System.Windows.Forms.Button Friend WithEvents Button5 As System.Windows.Forms.Button <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent() Me.picView = New System.Windows.Forms.PictureBox Me.Button1 = New System.Windows.Forms.Button Me.Button2 = New System.Windows.Forms.Button Me.Button3 = New System.Windows.Forms.Button Me.Button4 = New System.Windows.Forms.Button Me.Button5 = New System.Windows.Forms.Button Me.SuspendLayout() ' 'picView ' Me.picView.Anchor = CType((((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Bottom) _ Or System.Windows.Forms.AnchorStyles.Left) _ Or System.Windows.Forms.AnchorStyles.Right),System.Windows.Forms.AnchorStyles) Me.picView.Location = New System.Drawing.Point(16,16) Me.picView.Name = "picView" Me.picView.Size = New System.Drawing.Size(640,480) Me.picView.TabIndex = 0 Me.picView.TabStop = False ' 'Button1 ' Me.Button1.Anchor = CType((System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Left),System.Windows.Forms.AnchorStyles) Me.Button1.Location = New System.Drawing.Point(244,540) Me.Button1.Name = "Button1" Me.Button1.Size = New System.Drawing.Size(56,24) Me.Button1.TabIndex = 1 Me.Button1.Text = "start" ' 'Button2 ' Me.Button2.Anchor = CType((System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Left),System.Windows.Forms.AnchorStyles) Me.Button2.Location = New System.Drawing.Point(304,540) Me.Button2.Name = "Button2" Me.Button2.Size = New System.Drawing.Size(56,24) Me.Button2.TabIndex = 1 Me.Button2.Text = "stop" ' 'Button3 ' Me.Button3.Anchor = CType((System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Left),System.Windows.Forms.AnchorStyles) Me.Button3.Location = New System.Drawing.Point(380,540) Me.Button3.Name = "Button3" Me.Button3.Size = New System.Drawing.Size(56,24) Me.Button3.TabIndex = 1 Me.Button3.Text = "cap" ' 'Button4 ' Me.Button4.Anchor = CType((System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Left),System.Windows.Forms.AnchorStyles) Me.Button4.Location = New System.Drawing.Point(352,508) Me.Button4.Name = "Button4" Me.Button4.Size = New System.Drawing.Size(124,24) Me.Button4.TabIndex = 1 Me.Button4.Text = "色彩校正" ' 'Button5 ' Me.Button5.Anchor = CType((System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Left),System.Windows.Forms.AnchorStyles) Me.Button5.Location = New System.Drawing.Point(164,512) Me.Button5.Name = "Button5" Me.Button5.Size = New System.Drawing.Size(124,24) Me.Button5.TabIndex = 1 Me.Button5.Text = "画面大小" ' 'Form1 ' Me.AutoScaleBaseSize = New System.Drawing.Size(6,14) Me.ClientSize = New System.Drawing.Size(792,573) Me.Controls.Add(Me.Button1) Me.Controls.Add(Me.picView) Me.Controls.Add(Me.Button2) Me.Controls.Add(Me.Button3) Me.Controls.Add(Me.Button4) Me.Controls.Add(Me.Button5) Me.Name = "Form1" Me.Text = "Form1" Me.ResumeLayout(False) End Sub #End Region Private Sub Form1_Load(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles MyBase.Load cccap = New Cam(picView.Handle,picView.Width,picView.Height) End Sub Private Sub Button1_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Button1.Click cccap.Start() End Sub Private Sub Button2_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Button2.Click cccap.Stop() End Sub Private Sub Button3_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Button3.Click cccap.GrabImage("c:/test.bmp") End Sub Private Sub Form1_Closed(ByVal sender As Object,ByVal e As System.EventArgs) Handles MyBase.Closed cccap = Nothing End Sub Private Sub Button4_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Button4.Click cccap.capDlgVideoSource() End Sub Private Sub Button5_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Button5.Click cccap.capDlgVideoFormat() End Sub End Class

（编辑：李大同）

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