从相机捕获图像并保存 [英] Capture image from camera and save it

问题描述

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

I want to add a button in my form (MS Access Database), so it can capture image from my camera (laptop) and save it in a specific location (c:\image).

我在Office 2010或Office 365上使用Windows 10.

I am using windows 10 with office 2010 or office 365.

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

以此打开我的iPhone相机(USB附件).我需要使用笔记本电脑的内置摄像头.

With this I open my iPhone camera (usb attach). I need to use my in-build camera of my laptop.

推荐答案

此页面可能是您需要的. http://www.developerfusion.com/thread/46191/how-to-capture-picture-using-webcam-in-vb60/

This page is probably what you need. 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消息泵将消息发送到网络摄像头驱动程序，要求其拍照.另外，还提供了将来自助的提示.您通常可以通过搜索VB6来获得更好的结果，这几乎与VBA完全一样.VBA只是少了一些功能.

Basically what this is doing is using the windows message pump to send messages to web cam driver, asking it to take a picture. Also, a tip for future self help. You can often get better results by searching VB6, which is almost the exact same thing as VBA. VBA just has a few less functions.

如果缺少通用对话框控件.您可以将代码更改为此

If you lack the common dialog control. You can change the code to this

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

这篇关于从相机捕获图像并保存的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！