从相机捕获图像并保存

Posted 2023-05-07

【中文标题】从相机捕获图像并保存

【英文标题】：Capture image from camera and save it

【发布时间】：2017-05-12 20:47:10

【问题描述】：

我想在我的表单（MS Access 数据库）中添加一个按钮，以便它可以从我的相机（笔记本电脑）捕获图像并将其保存在特定位置（c:\image）。

我正在使用带有 Office 2010 或 Office 365 的 Windows 10。

带有 WIA 的代码：

Private Sub Command1_Click()
    
    Dim oWIA_DeviceManager As WIA.DeviceManager
    Dim oWIA_Device As WIA.Device
    Dim oWIA_ComDlg As WIA.CommonDialog
    Dim oImageFile As WIA.ImageFile
    Dim i As Long
    
    Set oWIA_DeviceManager = New WIA.DeviceManager
      
    If oWIA_DeviceManager.DeviceInfos.Count > 0 Then
        Set oWIA_ComDlg = New WIA.CommonDialog
          
        ' Index the Devices property starting here at 1, not 0 .
        For i = 1 To oWIA_DeviceManager.DeviceInfos.Count
            Set oWIA_Device = oWIA_DeviceManager.DeviceInfos.Item(i).Connect
          
            ' Use this to show Acquisition CommonDialog
            Set oImageFile = oWIA_ComDlg.ShowAcquireImage
              
            ' Use this to show Acquisition Wizard
            'Set oImageFile = oWIA_ComDlg.ShowAcquisitionWizard(oWIA_Device)
    
        Next i
    Else
        MsgBox "No WIA compatible device attached!"
    End If
      
End Sub

用这个我打开我的 iPhone 相机（USB 连接）。我需要使用笔记本电脑的内置摄像头。

【参考方案1】：

这个页面可能是你需要的。 http://www.developerfusion.com/thread/46191/how-to-capture-picture-using-webcam-in-vb60/

'******************* module code **************

Public Const WS_CHILD As Long = &H40000000
Public Const WS_VISIBLE As Long = &H10000000


Public Const WM_USER As Long = &H400
Public Const WM_CAP_START As Long = WM_USER


Public Const WM_CAP_DRIVER_CONNECT As Long = WM_CAP_START + 10
Public Const WM_CAP_DRIVER_DISCONNECT As Long = WM_CAP_START + 11
Public Const WM_CAP_SET_PREVIEW As Long = WM_CAP_START + 50
Public Const WM_CAP_SET_PREVIEWRATE As Long = WM_CAP_START + 52
Public Const WM_CAP_DLG_VIDEOFORMAT As Long = WM_CAP_START + 41
Public Const WM_CAP_FILE_SAVEDIB As Long = WM_CAP_START + 25






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


'************* end of module code ******************

Add the following controls in a form

1. A picture box with name "PicWebCam"

2. A commondialog control with name "CDialog"

3. Add 4 command buttons with name "cmd1","cmd2,"cmd3","cmd4"

then paste the following code

'************************** Code **************

Dim hCap As Long
Private Sub cmd4_Click()
Dim sFileName As String
    Call SendMessage(hCap, WM_CAP_SET_PREVIEW, CLng(False), 0&)
    With CDialog
        .CancelError = True
        .Flags = cdlOFNPathMustExist Or cdlOFNOverwritePrompt
        .Filter = "Bitmap Picture(*.bmp)|*.bmp|JPEG Picture(*.jpg)|*.jpg|All Files|*.*"
        .ShowSave
        sFileName = .FileName









    End With
    Call SendMessage(hCap, WM_CAP_FILE_SAVEDIB, 0&, ByVal CStr(sFileName))
DoFinally:
    Call SendMessage(hCap, WM_CAP_SET_PREVIEW, CLng(True), 0&)
End Sub




Private Sub Cmd3_Click()
Dim temp As Long
temp = SendMessage(hCap, WM_CAP_DRIVER_DISCONNECT, 0&, 0&)
End Sub


Private Sub Cmd1_Click()
hCap = capCreateCaptureWindow("Take a Camera Shot", WS_CHILD Or WS_VISIBLE, 0, 0, PicWebCam.Width, PicWebCam.Height, PicWebCam.hWnd, 0)
    If hCap <> 0 Then
        Call SendMessage(hCap, WM_CAP_DRIVER_CONNECT, 0, 0)
        Call SendMessage(hCap, WM_CAP_SET_PREVIEWRATE, 66, 0&)
        Call SendMessage(hCap, WM_CAP_SET_PREVIEW, CLng(True), 0&)
    End If
End Sub






Private Sub Cmd2_Click()
Dim temp As Long
temp = SendMessage(hCap, WM_CAP_DLG_VIDEOFORMAT, 0&, 0&)
End Sub


Private Sub Form_Load()
cmd1.Caption = "Start &Cam"
cmd2.Caption = "&Format Cam"
cmd3.Caption = "&Close Cam"
cmd4.Caption = "&Save Image"
End Sub
'**************** Code end ************************

基本上，这是使用 Windows 消息泵向网络摄像头驱动程序发送消息，要求它拍照。 另外，给未来的自助小费。搜索VB6通常可以得到更好的结果，这和VBA几乎一模一样。 VBA 只是少了一些函数。

如果您缺少通用对话框控件。你可以把代码改成这样

Private Sub cmd4_Click()
Dim sFileName As String
    Call SendMessage(hCap, WM_CAP_SET_PREVIEW, CLng(False), 0&)
    sFileName="C:\PathToNewImageFile.bmp"
    Call SendMessage(hCap, WM_CAP_FILE_SAVEDIB, 0&, ByVal CStr(sFileName))
DoFinally:
    Call SendMessage(hCap, WM_CAP_SET_PREVIEW, CLng(True), 0&)
End Sub

【讨论】：

感谢您的回复。我遇到了“2.一个名为“CDialog”的通用对话框控件”的问题。在 access 2007 哪里可以找到它？

点击您的工具菜单。然后是附加控件。找到“Microsoft Common Dialog”控件。并检查一下。然后单击确定，一个新项目将出现在您的工具箱中。将其绘制到您的用户窗体上以添加它，然后在底部单击它以显示属性并为其命名。但是，我尝试在我的 excel 2013 上执行此操作，但无法做到，所以是的……祈祷，否则我们必须使用 Windows API 来执行此操作。看起来它只是用来给你一个保存位置。如果需要，您可以将其硬编码为测试。答案已更新

我必须对***.com/questions/56757965/…中描述的Access db进行调整

【参考方案2】：

过去我曾使用 WIA（Microsoft Windows Image Acquisition）扫描仪，但它适用于网络摄像头。我一定会尝试的。

【讨论】：

您认为它适用于我的笔记本电脑摄像头吗？你有任何代码要测试吗？提前谢谢。