vb.net控制摄像头 调用摄像头的代码

windows8.1下VB.net使用摄像头

这个方法没问题。

win8.1，我用网上的方法，有时也有黑屏现象，但多试几次就好了。有时还会弹出要选择摄像头，选择确认、取消、应用都是黑屏。

相关问答

Q1: 我想问下vb.net下如何控制多个摄像头？

钩子函数+线程。vb.net控制摄像头你可以去网上找找 有本黄皮vb.net控制摄像头的书。那里就有一个9个摄像头控制vb.net控制摄像头的程序。叫.NET实例开发教程

Q2: VB.NET中怎么调用摄像头

给你个工程自己看...

运行后可以看到自己...

点按钮保存到c:\1.bmp

Q3: VB.NET 摄像头编程求助

这是6.0vb.net控制摄像头的，.net的做些改动就成！因为我没装摄像头，就没改！ Private Declare Function capCreateCaptureWindow Lib "avicap32.dll" _ Alias "capCreateCaptureWindowA" ( _ ByVal lpszWindowName As String, _ ByVal dwStyle As Long, _ ByVal x As Long, _ ByVal y As Long, _ ByVal nWidth As Long, _ ByVal nHeight As Long, _ ByVal hWndParent As Long, _ ByVal nID As Long) As Long Private Const WS_CHILD = H40000000 Private Const WS_VISIBLE = H10000000 Private Const WM_USER = H400 Private Const WM_CAP_START = H400 Private Const WM_CAP_EDIT_COPY = (WM_CAP_START + 30) Private Const WM_CAP_DRIVER_CONNECT = (WM_CAP_START + 10) Private Const WM_CAP_SET_PREVIEWRATE = (WM_CAP_START + 52) Private Const WM_CAP_SET_OVERLAY = (WM_CAP_START + 51) Private Const WM_CAP_SET_PREVIEW = (WM_CAP_START + 50) Private Const WM_CAP_DRIVER_DISCONNECT = (WM_CAP_START + 11) Private Declare Function SendMessage Lib "user32" _ Alias "SendMessageA" ( _ ByVal hwnd As Long, _ ByVal wMsg As Long, _ ByVal wParam As Long, _ lParam As Any) As Long Private Preview_Handle As Long Public Function CreateCaptureWindow( _ hWndParent As Long, _ Optional x As Long = 0, _ Optional y As Long = 0, _ Optional nWidth As Long = 320, _ Optional nHeight As Long = 240, _ Optional nCameraID As Long = 0) As Long Preview_Handle = capCreateCaptureWindow("Video", _ WS_CHILD + WS_VISIBLE, x, y, _ nWidth, nHeight, hWndParent, 1) SendMessage Preview_Handle, WM_CAP_DRIVER_CONNECT, nCameraID, 0 SendMessage Preview_Handle, WM_CAP_SET_PREVIEWRATE, 30, 0 SendMessage Preview_Handle, WM_CAP_SET_OVERLAY, 1, 0 SendMessage Preview_Handle, WM_CAP_SET_PREVIEW, 1, 0 CreateCaptureWindow = Preview_Handle End Function Public Function CapturePicture(nCaptureHandle As Long) As StdPicture Clipboard.Clear SendMessage nCaptureHandle, WM_CAP_EDIT_COPY, 0, 0 Set CapturePicture = Clipboard.GetData End Function Public Sub Disconnect(nCaptureHandle As Long, _ Optional nCameraID = 0) SendMessage nCaptureHandle, WM_CAP_DRIVER_DISCONNECT, _ nCameraID, 0 End Sub 4在form上添加一个PictureBox,一个按钮,Caption设为 Save Pic Dim Video_Handle As Long Private Sub Form_Load() Video_Handle = CreateCaptureWindow(PicCapture.hwnd) End Sub Private Sub Command1_Click() Dim x As StdPicture Set x = CapturePicture(Video_Handle) SavePicture x, "c:\a.bmp" End Sub Private Sub Form_Unload(Cancel As Integer) Disconnect Video_Handle End Sub 追问： 可不可以帮忙写为VB.NET的程序..?我自己运行后显示 未声明 PicCapture 追问： nCameraID = 0 这里在VB.NET下也用不vb.net控制摄像头了Clipboard.GetData 在VB.NET里也要跟参数的..我自己试用VB可以的..希望你能帮忙写一个VB.NET的..因为就算没有摄像头picturebox也会显示黑色的 回答： 你这程序是工程用的！请加多点分！我给你改 追问： 可不可以加我QQ先344568960 因为我积分不多...或许我可以给Q币你怎么的~可以吗？ 追问： 已经补充了积分了~希望能帮忙改成VB.NET的吧~谢谢~ 回答： 建一个picturebox 和 button Imports System.Runtime.InteropServices Public Class Form1 Const WM_CAP_START = H400S Const WS_CHILD = H40000000 Const WS_VISIBLE = H10000000 Const WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10 Const WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11 Const WM_CAP_EDIT_COPY = WM_CAP_START + 30 Const WM_CAP_SEQUENCE = WM_CAP_START + 62 Const WM_CAP_FILE_SAVEAS = WM_CAP_START + 23 Const WM_CAP_SET_SCALE = WM_CAP_START + 53 Const WM_CAP_SET_PREVIEWRATE = WM_CAP_START + 52 Const WM_CAP_SET_PREVIEW = WM_CAP_START + 50 Const SWP_NOMOVE = H2S Const SWP_NOSIZE = 1 Const SWP_NOZORDER = H4S Const HWND_BOTTOM = 1 Dim hWnd As Integer Declare Function capGetDriverDescriptionA Lib "avicap32.dll" _ (ByVal wDriverIndex As Short, _ ByVal lpszName As String, ByVal cbName As Integer, _ ByVal lpszVer As String, _ ByVal cbVer 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 hWnd As Integer, _ ByVal nID As Integer) As Integer Declare Function SendMessage Lib "user32" Alias "SendMessageA" _ (ByVal hwnd As Integer, ByVal Msg As Integer, _ ByVal wParam As Integer, _ Runtime.InteropServices.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 Private Sub PreviewVideo(ByVal pbCtrl As PictureBox) hWnd = capCreateCaptureWindowA(0, _ WS_VISIBLE Or WS_CHILD, 0, 0, 0, _ 0, pbCtrl.Handle.ToInt32, 0) If SendMessage( _ hWnd, WM_CAP_DRIVER_CONNECT, _ 0, 0) Then SendMessage(hWnd, WM_CAP_SET_SCALE, True, 0) SendMessage(hWnd, WM_CAP_SET_PREVIEWRATE, 30, 0) SendMessage(hWnd, WM_CAP_SET_PREVIEW, True, 0) SetWindowPos(hWnd, HWND_BOTTOM, 0, 0, _ pbCtrl.Width, pbCtrl.Height, _ SWP_NOMOVE Or SWP_NOZORDER) Else DestroyWindow(hWnd) End If End Sub Private Sub Form1_Load( _ ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load PreviewVideo(PictureBox1) End Sub Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim data As IDataObject Dim bmap As Image SendMessage(hWnd, WM_CAP_EDIT_COPY, 0, 0) data = Clipboard.GetDataObject() If data Is Nothing Then Exit Sub If data.GetDataPresent(GetType(System.Drawing.Bitmap)) Then bmap = CType(data.GetData(GetType( _ System.Drawing.Bitmap)), Image) bmap.Save("d:\a.bmp", System.Drawing.Imaging.ImageFormat.Bmp) MsgBox("完成") End If End Sub End Class

Q4: VB.NET怎么调用摄像头啊?求实例,最好配注释啊

Private Const WS_CHILD = H40000000

Private Const WS_VISIBLE = H10000000

Private Const WM_CAP_START = H400

Private Const WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10

Private Const WM_CAP_SET_SCALE = WM_CAP_START + 53

Private Const WM_CAP_SET_PREVIEWRATE = WM_CAP_START + 52

Private Const WM_CAP_SET_PREVIEW = WM_CAP_START + 50

Private Declare Function capCreateCaptureWindowA Lib "avicap32.dll" ( _

ByVal lpszWindowName As String, _

ByVal dwStyle As Long, _

ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Integer, _

ByVal hWndParent As Long, ByVal nID As Long) As Long

Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Integer, ByVal lParam As Long) As Long

Private Sub Form_Load()

'建立采集窗口（不显示窗口，处理后显示到PIC控件）

uwndc = capCreateCaptureWindowA("", WS_VISIBLE Or WS_CHILD, 0, 0, 320, 240, Me.hWnd, 0)

'连接

SendMessage uwndc, WM_CAP_DRIVER_CONNECT, 0, 0

'Scale开

SendMessage uwndc, WM_CAP_SET_SCALE, True, 0

'显示刷新MS

SendMessage uwndc, WM_CAP_SET_PREVIEWRATE, 40, 0

'用予览方式显示(特殊需要，不显示予缆）

SendMessage uwndc, WM_CAP_SET_PREVIEW, True, 0

End Sub

上述代码就可以实现 但是要注意相应的控件是否存在 不存在的 你自己画出来

Q5: VB.NET怎样把USB摄像头在显示器上输出的实时画面（像素信息），引入到数据库.

用directshow获取帧缓存,转换为标准图像格式(比如jpg,png这些),存储到数据库的image字段里就行了.

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