vb6 摄像头 源代码

在VB6中使用摄像头，需要调用相应的API来实现。需要用到的API包括：
1. CreateWindowEx：创建应用程序窗口以及摄像头的子窗口。
2. capCreateCaptureWindow：创建摄像头窗口。
3. SendMessage：向摄像头窗口发送消息，包括控制命令和配置参数等。
4. DestroyWindow：销毁窗口。

以下是一个简单的示例代码，可以实现打开摄像头并进行图片捕获。

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

Public 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 

Public Sub OpenCamera(ByVal Form1 As Form)

Dim iDevice As Integer ' 设备序号
Dim hCap As Long

Dim s As String

iDevice = 0 ' 默认选择第一个设备

' 打开摄像头
If iDevice > 0 Then
   s = Str(iDevice) & Chr$(0)
Else
   s = Chr$(0)
End If

hCap = capCreateCaptureWindow("capture window", WS_CHILD Or WS_VISIBLE, 0, 0, 640, 480, Form1.hWnd, 0)

SendMessage hCap, WM_CAP_DRIVER_CONNECT, iDevice, 0
SendMessage hCap, WM_CAP_SET_CALLBACK_FRAME, 0, 0
SendMessage hCap, WM_CAP_SET_PREVIEWRATE, 66, 0
SendMessage hCap, WM_CAP_SET_PREVIEW, True, 0

End Sub

Private Sub Command1_Click()
  Dim sFilename As String
  sFilename = App.Path & "\test.bmp"
  Call SavePicture(SaveFrameImage(),
          sFilename)
End Sub

Private Function SaveFrameImage() As StdPicture
  Dim hMemCOS As Long ' 内存设备句柄
  Dim hOldObj As Long ' 旧的Gdi对象
  Dim hNewObj As Long ' 新的Gdi对象
  Dim bmp As BitmapInfo
  Dim bmpExtra As Long

  hMemCOS = CreateCompatibleDC(0)
  bmp.bmiHeader.biSize = Len(bmp.bmiHeader)
  bmp.bmiHeader.biWidth = 640
  bmp.bmiHeader.biHeight = 480
  bmp.bmiHeader.biPlanes = 1
  bmp.bmiHeader.biBitCount = 24
  bmp.bmiHeader.biCompression = BI_RGB
  bmp.bmiHeader.biSizeImage = Width * 3 * Height
  hNewObj = CreateBitmap(Width, Height, 1, 24, ByVal 0&)
  hOldObj = SelectObject(hMemCOS, hNewObj)
  Call SendMessage(hWnd, WM_CAP_GRAB_FRAME, 0, 0)
  Call SendMessage(hWnd, WM_CAP_SAVEDIB, 0, ByVal VarPtr(bmp))
  bmpExtra = Len(bmp.bmiHeader)
  SaveFrameImage = CreatePicture(Width, Height, PixelFormat24bppRGB, hMemCOS, bmpExtra)
  Call SelectObject(hMemCOS, hOldObj)
  Call DeleteObject(hNewObj)
  Call DeleteDC(hMemCOS)
End Function

以上代码仅作为参考，具体的应用可以酌情调整。当然，为了更好地展示视频流，还需对摄像头的参数进行更详尽的配置。