module1.bas

VB编程实现摄像头图像的捕获,将摄像头的图象保存在一个二进制数组中

Attribute VB_Name = "Module1"
Public lwndC As Long
Public Const WM_USER = &H400
Public Const WM_CAP_START = WM_USER
Public Const WM_CAP_GET_CAPSTREAMPTR = WM_CAP_START + 1
Public Const WM_CAP_SET_CALLBACK_ERROR = WM_CAP_START + 2
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_FRAME = WM_CAP_START + 5
Public Const WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START + 6
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_CONNECT = WM_CAP_START + 10
Public Const WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11
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_SET_PREVIEW = WM_CAP_START + 50
Public Const WM_CAP_SET_OVERLAY = WM_CAP_START + 51
Public Const WM_CAP_SET_PREVIEWRATE = WM_CAP_START + 52
Public Const WM_CAP_SET_SCALE = WM_CAP_START + 53
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 = WM_CAP_START + 60
Public Const WM_CAP_GRAB_FRAME_NOSTOP = WM_CAP_START + 61

Public Const WM_CAP_SEQUENCE = WM_CAP_START + 62
Public Const WM_CAP_SEQUENCE_NOFILE = WM_CAP_START + 63
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_STOP = WM_CAP_START + 68
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


Public Const WM_CAP_SET_CALLBACK_CAPCONTROL = WM_CAP_START + 85


Public Const WM_CAP_END = WM_CAP_SET_CALLBACK_CAPCONTROL

Type CAPTUREPARMS
    dwRequestMicroSecPerFrame As Long       '// Requested capture rate
    fMakeUserHitOKToCapture As Long         '// Show "Hit OK to cap" dlg?
    wPercentDropForError As Long            '// Give error msg if > (10%)
    fYield As Long                          '// Capture via background task?
    dwIndexSize As Long                     '// Max index size in frames (32K)
    wChunkGranularity As Long               '// Junk chunk granularity (2K)
    fUsingDOSMemory As Long                 '// Use DOS buffers?
    wNumVideoRequested As Long              '// # video buffers, If 0, autocalc
    fCaptureAudio As Long                   '// Capture audio?
    wNumAudioRequested As Long              '// # audio buffers, If 0, autocalc
    vKeyAbort As Long                       '// Virtual key causing abort
    fAbortLeftMouse As Long                 '// Abort on left mouse?
    fAbortRightMouse As Long                '// Abort on right mouse?
    fLimitEnabled As Long                   '// Use wTimeLimit?
    wTimeLimit As Long                      '// Seconds to capture
    fMCIControl As Long                     '// Use MCI video source?
    fStepMCIDevice As Long                  '// Step MCI device?
    dwMCIStartTime As Long                  '// Time to start in MS
    dwMCIStopTime As Long                   '// Time to stop in MS
    fStepCaptureAt2x As Long                '// Perform spatial averaging 2x
    wStepCaptureAverageFrames As Long       '// Temporal average n Frames
    dwAudioBufferSize As Long               '// Size of audio bufs (0 = default)
    fDisableWriteCache As Long              '// Attempt to disable write cache
End Type

'-------------------以下是将捕获到内存的数据形成一个JPG图像-----------------

Type GUID
  Data1 As Long
  Data2 As Integer
  Data3 As Integer
  Data4(0 To 7) As Byte
End Type

Type GdiplusStartupInput
 GdiplusVersion As Long
 DebugEventCallback As Long
 SuppressBackgroundThread As Long
 SuppressExternalCodecs As Long
End Type

Type EncoderParameter
 GUID As GUID
 NumberOfValues As Long
 type As Long
 Value As Long
End Type

Type EncoderParameters
 Count As Long
 Parameter As EncoderParameter
End Type

Declare Function CopyMemory Lib "kernel32" Alias "RtlMoveMemory" ( _
Dest As Any, Src As Any, ByVal cb As Long) As Long
Declare Function GdiplusStartup Lib "GDIPlus" (token As Long, inputbuf As GdiplusStartupInput, Optional ByVal outputbuf As Long = 0) As Long
Declare Function GdiplusShutdown Lib "GDIPlus" (ByVal token As Long) As Long
Declare Function GdipCreateBitmapFromHBITMAP Lib "GDIPlus" (ByVal hbm As Long, ByVal hPal As Long, BITMAP As Long) As Long
Declare Function GdipDisposeImage Lib "GDIPlus" (ByVal Image As Long) As Long
Declare Function GdipSaveImageToFile Lib "GDIPlus" (ByVal Image As Long, ByVal FileName As Long, clsidEncoder As GUID, encoderParams As Any) As Long
Declare Function CLSIDFromString Lib "ole32" (ByVal str As Long, id As GUID) As Long
 



Public Sub SavePic(ByVal pict As StdPicture, ByVal FileName As String, PicType As String, _
Optional ByVal Quality As Byte = 80, Optional ByVal TIFF_ColorDepth As Long = 24, _
Optional ByVal TIFF_Compression As Long = 6)
 
Dim tSI As GdiplusStartupInput
Dim lRes As Long
Dim lGDIP As Long
Dim lBitmap As Long
Dim aEncParams() As Byte
On Error Resume Next
tSI.GdiplusVersion = 1
' 初始化 GDI+
lRes = GdiplusStartup(lGDIP, tSI)
If lRes = 0 Then ' 从句柄创建 GDI+ 图像
lRes = GdipCreateBitmapFromHBITMAP(pict.Handle, 0, lBitmap)
 If lRes = 0 Then
 Dim tJpgEncoder As GUID
 Dim tParams As EncoderParameters
 '初始化解码器的GUID标识
    CLSIDFromString StrPtr("{557CF401-1A04-11D3-9A73-0000F81EF32E}"), tJpgEncoder
    tParams.Count = 1
    '设置解码器参数
    With tParams.Parameter
    'Quality
    CLSIDFromString StrPtr("{1D5BE4B5-FA4A-452D-9CDD-5DB35105E7EB}"), .GUID
    ' 得到Quality参数的GUID标识
    .NumberOfValues = 1
    .type = 4
    .Value = VarPtr(Quality)
    End With
 ReDim aEncParams(1 To Len(tParams))
Call CopyMemory(aEncParams(1), tParams, Len(tParams))
lRes = GdipSaveImageToFile(lBitmap, StrPtr(FileName), tJpgEncoder, aEncParams(1))
'保存图像
GdipDisposeImage lBitmap
' 销毁GDI+图像
End If
GdiplusShutdown lGDIP
'销毁 GDI+
End If
Erase aEncParams
End Sub