做了一个摄像头采集照片的程序，采用VFW和GDI

liucqa · 发表于 2013-3-23 03:21

本帖最后由 liucqa 于 2014-3-1 23:41 编辑

捕获.JPG

左中右三个窗口分别是：摄像头捕获预览窗口(子窗体)、裁切之后的图片显示窗口(Image控件)、正常捕获图片(Image控件)+裁切预览框

特点：
1、采用VFW技术，不使用第三方控件。
VFW(Video for Windows)是Microsoft推出的关于数字视频的一个开发包。VFW推出了一整套完整的视频采集、压缩、解压缩、回放和编辑的应用程序接口(API)。
2、使用GDI操作Image控件图片的裁切，可以保存成jpg格式。
3、支持裁切框预览（用GDI绘制输出）

下面是建立捕获预览窗口以及连接摄像头的函数

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
Dim bRet As Long, n As Long, strAllDeviceName As String
n = 0
strAllDeviceName = ""
Do
bRet = capGetDriverDescriptionA(n, lpszName, 100, lpszVer, 100)
n = n + 1
If bRet Then strAllDeviceName = strAllDeviceName + TrimNull(lpszName) + vbCrLf
Loop While bRet
'MsgBox "设备数量：" & N - 1 & vbCrLf & "设备名称:" & vbCrLf & strAllDeviceName '输出设备名称
'建立捕获窗口，以子窗口形式附在CapPicform窗体上
Preview_Handle = capCreateCaptureWindowA(TrimNull(lpszName), _
WS_CHILD + WS_VISIBLE, x, y, _
nWidth, nHeight, hWndParent, 1)
If capDriverConnect(Preview_Handle, nCameraID) > 0 Then '成功返回1
Dim Caps As CAPDRIVERCAPS
capDriverGetCaps Preview_Handle, VarPtr(Caps), Len(Caps)
If Caps.fHasDlgVideoSource = 0 Then MsgBox ("不支持VideoSource设置")
'If Caps.fHasDlgVideoDisplay = 0 Then MsgBox ("不支持VideoDisplay设置")
If Caps.fHasDlgVideoFormat = 0 Then MsgBox ("不支持VideoFormat设置")
capPreviewScale Preview_Handle, True '是否允许图像放缩
capPreviewRate Preview_Handle, 66 '采集间隔(毫秒为单位的变量，用来标识多长时间采集、显示一次。66是15帧/秒)
capPreview Preview_Handle, True '预览
capPreview Preview_Handle, True '预览模式，应用时overlay模式自动被禁止，preview模式占用cpu资源，
capOverlay Preview_Handle, False '覆盖模式，应用后preview模式自动被禁止。
Else
MsgBox ("摄像头被占用")
End If
CreateCaptureWindow = Preview_Handle
End Function

复制代码

测试VFW功能下摄像头是否工作正常的演示

测试摄像头v0.22.rar (46.8 KB, 下载次数: 1002)

***********************************************************************************************************

vfw技术由于比较古老，对摄像头的支持并不好，存在一些没法解决的问题，简单操作摄像头没什么问题，但要是对摄像头的操作有更高要求（例如多个摄像头同时采集、人工或者动态切换摄像头等），建议采用DirectShow技术。C#可以使用Aforge库来实现对摄像头的进一步操作。具体可以看下面链接中的例子。

对摄像头的操作示例，采用Aforge库

liucqa · 发表于 2013-3-23 03:34

本帖最后由 liucqa 于 2014-2-9 23:09 编辑

总结一下：
1、采用VFW技术对摄像头的兼容性比较好，不必采用第三方控件，代码部署方便。
2、VFW控制摄像头对驱动有要求，建议采用官方驱动，不要使用中星微芯片的通用驱动（可能会造成VFW工作不正常）
3、VFW暂时无法提前判断摄像头被占用情况，导致摄像头被占用时，会弹出视频源选择的窗口，目前只能用定时器解决。
4、VFW的capGetDriverDescription函数不能获取摄像头的友好名称，只能得到驱动的名称和版本，不太方便。

谁有这方面的解决办法，欢迎交流。

采用DirectX Show控制摄像头兼容性远远好于VFW，推荐采用C#开发。

liucqa · 发表于 2013-3-23 03:39

本帖最后由 liucqa 于 2013-3-23 03:45 编辑

Option Explicit
Public Const WM_USER = &H400
Public Const WM_CLOSE = &H10 '关闭视频窗口
Type POINTAPI
x As Long
y As Long
End Type
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
Declare Function SendMessageS Lib "User32" Alias "SendMessageA" (ByVal hWnd As Long, ByVal wMsg As Long, ByVal wParam As Integer, ByVal lParam As String) As Long
'// ------------------------------------------------------------------
'// Window Messages WM_CAP... which can be sent to an AVICAP window
'// ------------------------------------------------------------------
'// Defines start of the message range
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
'// Following added post VFW 1.1
Public Const WM_CAP_SET_CALLBACK_CAPCONTROL = WM_CAP_START + 85
'// Defines end of the message range
Public Const WM_CAP_END = WM_CAP_SET_CALLBACK_CAPCONTROL
'// ------------------------------------------------------------------
'// Structures
'// ------------------------------------------------------------------
Type CAPDRIVERCAPS
wDeviceIndex As Long ' // Driver index in system.ini
fHasOverlay As Long ' // Can device overlay?
fHasDlgVideoSource As Long ' // Has Video source dlg?
fHasDlgVideoFormat As Long ' // Has Format dlg?
fHasDlgVideoDisplay As Long ' // Has External out dlg?
fCaptureInitialized As Long ' // Driver ready to capture?
fDriverSuppliesPalettes As Long ' // Can driver make palettes?
hVideoIn As Long ' // Driver In channel
hVideoOut As Long ' // Driver Out channel
hVideoExtIn As Long ' // Driver Ext In channel
hVideoExtOut As Long ' // Driver Ext Out channel
End Type
Type CAPSTATUS
uiImageWidth As Long '// Width of the image
uiImageHeight As Long '// Height of the image
fLiveWindow As Long '// Now Previewing video?
fOverlayWindow As Long '// Now Overlaying video?
fScale As Long '// Scale image to client?
ptScroll As POINTAPI '// Scroll position
fUsingDefaultPalette As Long '// Using default driver palette?
fAudioHardware As Long '// Audio hardware present?
fCapFileExists As Long '// Does capture file exist?
dwCurrentVideoFrame As Long '// # of video frames cap'td
dwCurrentVideoFramesDropped As Long '// # of video frames dropped
dwCurrentWaveSamples As Long '// # of wave samples cap'td
dwCurrentTimeElapsedMS As Long '// Elapsed capture duration
hPalCurrent As Long '// Current palette in use
fCapturingNow As Long '// Capture in progress?
dwReturn As Long '// Error value after any operation
wNumVideoAllocated As Long '// Actual number of video buffers
wNumAudioAllocated As Long '// Actual number of audio buffers
End Type
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
Type CAPINFOCHUNK
fccInfoID As Long '// Chunk ID, "ICOP" for copyright
lpData As Long '// pointer to data
cbData As Long '// size of lpData
End Type
Type VIDEOHDR
lpData As Long '// address of video buffer
dwBufferLength As Long '// size, in bytes, of the Data buffer
dwBytesUsed As Long '// see below
dwTimeCaptured As Long '// see below
dwUser As Long '// user-specific data
dwFlags As Long '// see below
dwReserved(3) As Long '// reserved; do not use}
End Type
Public Const WS_CHILD = &H40000000 '使用子窗口
Public Const WS_VISIBLE = &H10000000 '创建一个初始不可用的窗体
Public Const WS_CAPTION = &HC00000 '创建一个有标题栏的窗体(隐含了WS_BORDER)
Public Const WS_BORDER = &H800000 '创建一个有边框的窗体
Public Const WS_OVERLAPPED = &H0& '创建一个重叠窗体?一个重叠窗体一般有标题和边框
Public Const WS_POPUP = &H80000000 '创建一个弹出式窗体,不能和WS_CHILD一起使用
'// The two functions exported by AVICap
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
Declare Function capGetDriverDescriptionA Lib "avicap32.dll" ( _
ByVal wDriver As Integer, _
ByVal lpszName As String, _
ByVal cbName As Long, _
ByVal lpszVer As String, _
ByVal cbVer As Long) As Boolean
'// ------------------------------------------------------------------
'// String IDs from status and error callbacks
'// ------------------------------------------------------------------
Public Const IDS_CAP_BEGIN = 300 '/* "Capture Start" */
Public Const IDS_CAP_END = 301 '/* "Capture End" */
Public Const IDS_CAP_INFO = 401 '/* "%s" */
Public Const IDS_CAP_OUTOFMEM = 402 '/* "Out of memory" */
Public Const IDS_CAP_FILEEXISTS = 403 '/* "File '%s' exists -- overwrite it?" */
Public Const IDS_CAP_ERRORPALOPEN = 404 '/* "Error opening palette '%s'" */
Public Const IDS_CAP_ERRORPALSAVE = 405 '/* "Error saving palette '%s'" */
Public Const IDS_CAP_ERRORDIBSAVE = 406 '/* "Error saving frame '%s'" */
Public Const IDS_CAP_DEFAVIEXT = 407 '/* "avi" */
Public Const IDS_CAP_DEFPALEXT = 408 '/* "pal" */
Public Const IDS_CAP_CANTOPEN = 409 '/* "Cannot open '%s'" */
Public Const IDS_CAP_SEQ_MSGSTART = 410 '/* "Select OK to start capture\nof video sequence\nto %s." */
Public Const IDS_CAP_SEQ_MSGSTOP = 411 '/* "Hit ESCAPE or click to end capture" */
Public Const IDS_CAP_VIDEDITERR = 412 '/* "An error occurred while trying to run VidEdit." */
Public Const IDS_CAP_READONLYFILE = 413 '/* "The file '%s' is a read-only file." */
Public Const IDS_CAP_WRITEERROR = 414 '/* "Unable to write to file '%s'.\nDisk may be full." */
Public Const IDS_CAP_NODISKSPACE = 415 '/* "There is no space to create a capture file on the specified device." */
Public Const IDS_CAP_SETFILESIZE = 416 '/* "Set File Size" */
Public Const IDS_CAP_SAVEASPERCENT = 417 '/* "SaveAs: %2ld%% Hit Escape to abort." */
Public Const IDS_CAP_DRIVER_ERROR = 418 '/* Driver specific error message */
Public Const IDS_CAP_WAVE_OPEN_ERROR = 419 '/* "Error: Cannot open the wave input device.\nCheck sample size, frequency, and channels." */
Public Const IDS_CAP_WAVE_ALLOC_ERROR = 420 '/* "Error: Out of memory for wave buffers." */
Public Const IDS_CAP_WAVE_PREPARE_ERROR = 421 '/* "Error: Cannot prepare wave buffers." */
Public Const IDS_CAP_WAVE_ADD_ERROR = 422 '/* "Error: Cannot add wave buffers." */
Public Const IDS_CAP_WAVE_SIZE_ERROR = 423 '/* "Error: Bad wave size." */
Public Const IDS_CAP_VIDEO_OPEN_ERROR = 424 '/* "Error: Cannot open the video input device." */
Public Const IDS_CAP_VIDEO_ALLOC_ERROR = 425 '/* "Error: Out of memory for video buffers." */
Public Const IDS_CAP_VIDEO_PREPARE_ERROR = 426 '/* "Error: Cannot prepare video buffers." */
Public Const IDS_CAP_VIDEO_ADD_ERROR = 427 '/* "Error: Cannot add video buffers." */
Public Const IDS_CAP_VIDEO_SIZE_ERROR = 428 '/* "Error: Bad video size." */
Public Const IDS_CAP_FILE_OPEN_ERROR = 429 '/* "Error: Cannot open capture file." */
Public Const IDS_CAP_FILE_WRITE_ERROR = 430 '/* "Error: Cannot write to capture file. Disk may be full." */
Public Const IDS_CAP_RECORDING_ERROR = 431 '/* "Error: Cannot write to capture file. Data rate too high or disk full." */
Public Const IDS_CAP_RECORDING_ERROR2 = 432 '/* "Error while recording" */
Public Const IDS_CAP_AVI_INIT_ERROR = 433 '/* "Error: Unable to initialize for capture." */
Public Const IDS_CAP_NO_FRAME_CAP_ERROR = 434 '/* "Warning: No frames captured.\nConfirm that vertical sync interrupts\nare configured and enabled." */
Public Const IDS_CAP_NO_PALETTE_WARN = 435 '/* "Warning: Using default palette." */
Public Const IDS_CAP_MCI_CONTROL_ERROR = 436 '/* "Error: Unable to access MCI device." */
Public Const IDS_CAP_MCI_CANT_STEP_ERROR = 437 '/* "Error: Unable to step MCI device." */
Public Const IDS_CAP_NO_AUDIO_CAP_ERROR = 438 '/* "Error: No audio data captured.\nCheck audio card settings." */
Public Const IDS_CAP_AVI_DRAWDIB_ERROR = 439 '/* "Error: Unable to draw this data format." */
Public Const IDS_CAP_COMPRESSOR_ERROR = 440 '/* "Error: Unable to initialize compressor." */
Public Const IDS_CAP_AUDIO_DROP_ERROR = 441 '/* "Error: Audio data was lost during capture, reduce capture rate." */
'/* status string IDs */
Public Const IDS_CAP_STAT_LIVE_MODE = 500 '/* "Live window" */
Public Const IDS_CAP_STAT_OVERLAY_MODE = 501 '/* "Overlay window" */
Public Const IDS_CAP_STAT_CAP_INIT = 502 '/* "Setting up for capture - Please wait" */
Public Const IDS_CAP_STAT_CAP_FINI = 503 '/* "Finished capture, now writing frame %ld" */
Public Const IDS_CAP_STAT_PALETTE_BUILD = 504 '/* "Building palette map" */
Public Const IDS_CAP_STAT_OPTPAL_BUILD = 505 '/* "Computing optimal palette" */
Public Const IDS_CAP_STAT_I_FRAMES = 506 '/* "%d frames" */
Public Const IDS_CAP_STAT_L_FRAMES = 507 '/* "%ld frames" */
Public Const IDS_CAP_STAT_CAP_L_FRAMES = 508 '/* "Captured %ld frames" */
Public Const IDS_CAP_STAT_CAP_AUDIO = 509 '/* "Capturing audio" */
Public Const IDS_CAP_STAT_VIDEOCURRENT = 510 '/* "Captured %ld frames (%ld dropped) %d.%03d sec." */
Public Const IDS_CAP_STAT_VIDEOAUDIO = 511 '/* "Captured %d.%03d sec. %ld frames (%ld dropped) (%d.%03d fps). %ld audio bytes (%d,%03d sps)" */
Public Const IDS_CAP_STAT_VIDEOONLY = 512 '/* "Captured %d.%03d sec. %ld frames (%ld dropped) (%d.%03d fps)" */

复制代码

对摄像头进行操作的模块代码（就是封装了SendMessage的调用，方便使用，代码来自网上。），供大家参考，有问题请百度。

liucqa · 发表于 2013-3-23 03:41

本帖最后由 liucqa 于 2013-3-23 03:46 编辑

续上楼

Function capSetCallbackOnError(ByVal lwnd As Long, ByVal lpProc As Long) As Boolean
capSetCallbackOnError = SendMessage(lwnd, WM_CAP_SET_CALLBACK_ERROR, 0, lpProc)
End Function
Function capSetCallbackOnStatus(ByVal lwnd As Long, ByVal lpProc As Long) As Boolean
capSetCallbackOnStatus = SendMessage(lwnd, WM_CAP_SET_CALLBACK_STATUS, 0, lpProc)
End Function
Function capSetCallbackOnYield(ByVal lwnd As Long, ByVal lpProc As Long) As Boolean
capSetCallbackOnYield = SendMessage(lwnd, WM_CAP_SET_CALLBACK_YIELD, 0, lpProc)
End Function
Function capSetCallbackOnFrame(ByVal lwnd As Long, ByVal lpProc As Long) As Boolean
capSetCallbackOnFrame = SendMessage(lwnd, WM_CAP_SET_CALLBACK_FRAME, 0, lpProc)
End Function
Function capSetCallbackOnVideoStream(ByVal lwnd As Long, ByVal lpProc As Long) As Boolean
capSetCallbackOnVideoStream = SendMessage(lwnd, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, lpProc)
End Function
Function capSetCallbackOnWaveStream(ByVal lwnd As Long, ByVal lpProc As Long) As Boolean
capSetCallbackOnWaveStream = SendMessage(lwnd, WM_CAP_SET_CALLBACK_WAVESTREAM, 0, lpProc)
End Function
Function capSetCallbackOnCapControl(ByVal lwnd As Long, ByVal lpProc As Long) As Boolean
capSetCallbackOnCapControl = SendMessage(lwnd, WM_CAP_SET_CALLBACK_CAPCONTROL, 0, lpProc)
End Function
Function capSetUserData(ByVal lwnd As Long, ByVal lUser As Long) As Boolean
capSetUserData = SendMessage(lwnd, WM_CAP_SET_USER_DATA, 0, lUser)
End Function
Function capGetUserData(ByVal lwnd As Long) As Long
capGetUserData = SendMessage(lwnd, WM_CAP_GET_USER_DATA, 0, 0)
End Function
Function capDriverConnect(ByVal lwnd As Long, ByVal I As Integer) As Long
capDriverConnect = SendMessage(lwnd, WM_CAP_DRIVER_CONNECT, I, 0)
End Function
Function capDriverDisconnect(ByVal lwnd As Long) As Boolean
capDriverDisconnect = SendMessage(lwnd, WM_CAP_DRIVER_DISCONNECT, 0, 0)
End Function
Function capDriverGetName(ByVal lwnd As Long, ByVal szName As Long, ByVal wSize As Integer) As Boolean
capDriverGetName = SendMessage(lwnd, YOURCONSTANTMESSAGE, wSize, szName)
End Function
Function capDriverGetVersion(ByVal lwnd As Long, ByVal szVer As Long, ByVal wSize As Integer) As Boolean
capDriverGetVersion = SendMessage(lwnd, WM_CAP_DRIVER_GET_VERSION, wSize, szVer)
End Function
Function capDriverGetCaps(ByVal lwnd As Long, ByVal s As Long, ByVal wSize As Integer) As Boolean
capDriverGetCaps = SendMessage(lwnd, WM_CAP_DRIVER_GET_CAPS, wSize, s)
End Function
Function capFileSetCaptureFile(ByVal lwnd As Long, szName As String) As Boolean
capFileSetCaptureFile = SendMessageS(lwnd, WM_CAP_FILE_SET_CAPTURE_FILE, 0, szName)
End Function
Function capFileGetCaptureFile(ByVal lwnd As Long, ByVal szName As Long, wSize As String) As Boolean
capFileGetCaptureFile = SendMessageS(lwnd, WM_CAP_FILE_SET_CAPTURE_FILE, wSize, szName)
End Function
Function capFileAlloc(ByVal lwnd As Long, ByVal dwSize As Long) As Boolean
capFileAlloc = SendMessage(lwnd, WM_CAP_FILE_ALLOCATE, 0, dwSize)
End Function
Function capFileSaveAs(ByVal lwnd As Long, szName As String) As Boolean
capFileSaveAs = SendMessageS(lwnd, WM_CAP_FILE_SAVEAS, 0, szName)
End Function
Function capFileSetInfoChunk(ByVal lwnd As Long, ByVal lpInfoChunk As Long) As Boolean
capFileSetInfoChunk = SendMessage(lwnd, WM_CAP_FILE_SET_INFOCHUNK, 0, lpInfoChunk)
End Function
Function capFileSaveDIB(ByVal lwnd As Long, ByVal szName As Long) As Boolean
capFileSaveDIB = SendMessage(lwnd, WM_CAP_FILE_SAVEDIB, 0, szName)
End Function
Function capEditCopy(ByVal lwnd As Long) As Boolean
capEditCopy = SendMessage(lwnd, WM_CAP_EDIT_COPY, 0, 0)
End Function
Function capSetAudioFormat(ByVal lwnd As Long, ByVal s As Long, ByVal wSize As Integer) As Boolean
capSetAudioFormat = SendMessage(lwnd, WM_CAP_SET_AUDIOFORMAT, wSize, s)
End Function
Function capGetAudioFormat(ByVal lwnd As Long, ByVal s As Long, ByVal wSize As Integer) As Long
capGetAudioFormat = SendMessage(lwnd, WM_CAP_GET_AUDIOFORMAT, wSize, s)
End Function
Function capGetAudioFormatSize(ByVal lwnd As Long) As Long
capGetAudioFormatSize = SendMessage(lwnd, WM_CAP_GET_AUDIOFORMAT, 0, 0)
End Function
Function capDlgVideoFormat(ByVal lwnd As Long) As Boolean
capDlgVideoFormat = SendMessage(lwnd, WM_CAP_DLG_VIDEOFORMAT, 0, 0)
End Function
Function capDlgVideoSource(ByVal lwnd As Long) As Boolean
capDlgVideoSource = SendMessage(lwnd, WM_CAP_DLG_VIDEOSOURCE, 0, 0)
End Function
Function capDlgVideoDisplay(ByVal lwnd As Long) As Boolean
capDlgVideoDisplay = SendMessage(lwnd, WM_CAP_DLG_VIDEODISPLAY, 0, 0)
End Function
Function capDlgVideoCompression(ByVal lwnd As Long) As Boolean
capDlgVideoCompression = SendMessage(lwnd, WM_CAP_DLG_VIDEOCOMPRESSION, 0, 0)
End Function
Function capGetVideoFormat(ByVal lwnd As Long, ByVal s As Long, ByVal wSize As Integer) As Long
capGetVideoFormat = SendMessage(lwnd, WM_CAP_GET_VIDEOFORMAT, wSize, s)
End Function
Function capGetVideoFormatSize(ByVal lwnd As Long) As Long
capGetVideoFormatSize = SendMessage(lwnd, WM_CAP_GET_VIDEOFORMAT, 0, 0)
End Function
Function capSetVideoFormat(ByVal lwnd As Long, ByVal s As Long, ByVal wSize As Integer) As Boolean
capSetVideoFormat = SendMessage(lwnd, WM_CAP_SET_VIDEOFORMAT, wSize, s)
End Function
Function capPreview(ByVal lwnd As Long, ByVal f As Boolean) As Boolean
capPreview = SendMessage(lwnd, WM_CAP_SET_PREVIEW, f, 0)
End Function
Function capPreviewRate(ByVal lwnd As Long, ByVal wMS As Integer) As Boolean
capPreviewRate = SendMessage(lwnd, WM_CAP_SET_PREVIEWRATE, wMS, 0)
End Function
Function capOverlay(ByVal lwnd As Long, ByVal f As Boolean) As Boolean
capOverlay = SendMessage(lwnd, WM_CAP_SET_OVERLAY, f, 0)
End Function
Function capPreviewScale(ByVal lwnd As Long, ByVal f As Boolean) As Boolean
capPreviewScale = SendMessage(lwnd, WM_CAP_SET_SCALE, f, 0)
End Function
Function capGetStatus(ByVal lwnd As Long, ByVal s As Long, ByVal wSize As Integer) As Boolean
capGetStatus = SendMessage(lwnd, WM_CAP_GET_STATUS, wSize, s)
End Function
Function capSetScrollPos(ByVal lwnd As Long, ByVal lpP As Long) As Boolean
capSetScrollPos = SendMessage(lwnd, WM_CAP_SET_SCROLL, 0, lpP)
End Function
Function capGrabFrame(ByVal lwnd As Long) As Boolean
capGrabFrame = SendMessage(lwnd, WM_CAP_GRAB_FRAME, 0, 0)
End Function
Function capGrabFrameNoStop(ByVal lwnd As Long) As Boolean
capGrabFrameNoStop = SendMessage(lwnd, WM_CAP_GRAB_FRAME_NOSTOP, 0, 0)
End Function
Function capCaptureSequence(ByVal lwnd As Long) As Boolean
capCaptureSequence = SendMessage(lwnd, WM_CAP_SEQUENCE, 0, 0)
End Function
Function capCaptureSequenceNoFile(ByVal lwnd As Long) As Boolean
capCaptureSequenceNoFile = SendMessage(lwnd, WM_CAP_SEQUENCE_NOFILE, 0, 0)
End Function
Function capCaptureStop(ByVal lwnd As Long) As Boolean
capCaptureStop = SendMessage(lwnd, WM_CAP_STOP, 0, 0)
End Function
Function capCaptureAbort(ByVal lwnd As Long) As Boolean
capCaptureAbort = SendMessage(lwnd, WM_CAP_ABORT, 0, 0)
End Function
Function capCaptureSingleFrameOpen(ByVal lwnd As Long) As Boolean
capCaptureSingleFrameOpen = SendMessage(lwnd, WM_CAP_SINGLE_FRAME_OPEN, 0, 0)
End Function
Function capCaptureSingleFrameClose(ByVal lwnd As Long) As Boolean
capCaptureSingleFrameClose = SendMessage(lwnd, WM_CAP_SINGLE_FRAME_CLOSE, 0, 0)
End Function
Function capCaptureSingleFrame(ByVal lwnd As Long) As Boolean
capCaptureSingleFrame = SendMessage(lwnd, WM_CAP_SINGLE_FRAME, 0, 0)
End Function
Function capCaptureGetSetup(ByVal lwnd As Long, ByVal s As Long, ByVal wSize As Integer) As Boolean
capCaptureGetSetup = SendMessage(lwnd, WM_CAP_GET_SEQUENCE_SETUP, wSize, s)
End Function
Function capCaptureSetSetup(ByVal lwnd As Long, ByVal s As Long, ByVal wSize As Integer) As Boolean
capCaptureSetSetup = SendMessage(lwnd, WM_CAP_SET_SEQUENCE_SETUP, wSize, s)
End Function
Function capSetMCIDeviceName(ByVal lwnd As Long, ByVal szName As Long) As Boolean
capSetMCIDeviceName = SendMessage(lwnd, WM_CAP_SET_MCI_DEVICE, 0, szName)
End Function
Function capGetMCIDeviceName(ByVal lwnd As Long, ByVal szName As Long, ByVal wSize As Integer) As Boolean
capGetMCIDeviceName = SendMessage(lwnd, WM_CAP_GET_MCI_DEVICE, wSize, szName)
End Function
Function capPaletteOpen(ByVal lwnd As Long, ByVal szName As Long) As Boolean
capPaletteOpen = SendMessage(lwnd, WM_CAP_PAL_OPEN, 0, szName)
End Function
Function capPaletteSave(ByVal lwnd As Long, ByVal szName As Long) As Boolean
capPaletteSave = SendMessage(lwnd, WM_CAP_PAL_SAVE, 0, szName)
End Function
Function capPalettePaste(ByVal lwnd As Long) As Boolean
capPalettePaste = SendMessage(lwnd, WM_CAP_PAL_PASTE, 0, 0)
End Function
Function capPaletteAuto(ByVal lwnd As Long, ByVal iFrames As Integer, ByVal iColor As Long) As Boolean
capPaletteAuto = SendMessage(lwnd, WM_CAP_PAL_AUTOCREATE, iFrames, iColors)
End Function
Function capPaletteManual(ByVal lwnd As Long, ByVal fGrab As Boolean, ByVal iColors As Long) As Boolean
capPaletteManual = SendMessage(lwnd, WM_CAP_PAL_MANUALCREATE, fGrab, iColors)
End Function

复制代码

原来的代码个别函数返回值不正确，需要修改。

liucqa · 发表于 2013-3-23 03:54

本帖最后由 liucqa 于 2013-3-23 03:56 编辑

capEditCopy函数可以把图片以bmp格式复制到剪贴板，使用gdi可以将剪贴板的bmp图片以jpg格式保存到本地硬盘。
剪贴板保存成jpg的代码参考6楼，把图片句柄换成GetClipboardData(CF_BITMAP)即可。

下面是断开摄像头的代码

Public Sub Disconnects(nCaptureHandle As Long, Optional nCameraID = 0)
If capDriverDisconnect(nCaptureHandle) = False Then '断开连接
MsgBox "断开与摄像头连接失败，请检查是否有应用程序冲突，或更换摄像头驱动！"
End If
'SendMessage nCaptureHandle, WM_CAP_DRIVER_DISCONNECT, nCameraID, 0
SendMessage nCaptureHandle, WM_CLOSE, 0, 0 '关闭视频窗口
nCaptureHandle = 0
End Sub

复制代码

liucqa · 发表于 2013-3-23 03:56

下面是通过Gdi保存Image控件的图片为jpg格式文件的代码，看不懂的请百度。

Public
Function StdPictureSave2JPG(ByVal picture As StdPicture, ByVal
FileFullName As String, Optional ByVal quality As Byte = 95) As Boolean
Dim tSI As GdiplusStartupInput
Dim lRes As Long
Dim lGDIP As Long
Dim lBitmap As Long
Dim hBitmap As Long
'初始化 GDI+
tSI.GdiplusVersion = 1
lRes = GdiplusStartup(lGDIP, tSI, 0)
If lRes = 0 Then
lRes = GdipCreateBitmapFromHBITMAP(picture.Handle, 0, lBitmap)
If lRes = 0 Then
Dim tJpgEncoder As GUID
Dim tParams As EncoderParameters
CLSIDFromString StrPtr("{557CF401-1A04-11D3-9A73-0000F81EF32E}"), tJpgEncoder
tParams.Count = 1
With tParams.Parameter ' Quality
CLSIDFromString StrPtr("{1D5BE4B5-FA4A-452D-9CDD-5DB35105E7EB}"), .GUID
.NumberOfValues = 1
.Type = 4
.Value = VarPtr(quality)
End With
lRes = GdipSaveImageToFile(lBitmap, StrPtr(FileFullName), tJpgEncoder, tParams)
GdipDisposeImage lBitmap
End If
GdiplusShutdown lGDIP
End If
StdPictureSave2JPG = Not lRes
End Function

复制代码

liucqa · 发表于 2013-3-23 03:59

本帖最后由 liucqa 于 2013-3-23 13:56 编辑

Image控件的图片保存成jpg的函数

Public Function StdPictureSave2JPG(ByVal picture As StdPicture, ByVal FileFullName As String, Optional ByVal quality As Byte = 95) As Boolean
Dim tSI As GdiplusStartupInput
Dim lRes As Long
Dim lGDIP As Long
Dim lBitmap As Long
Dim hBitmap As Long
'初始化 GDI+
tSI.GdiplusVersion = 1
lRes = GdiplusStartup(lGDIP, tSI, 0)
If lRes = 0 Then
lRes = GdipCreateBitmapFromHBITMAP(picture.Handle, 0, lBitmap)
If lRes = 0 Then
Dim tJpgEncoder As GUID
Dim tParams As EncoderParameters
CLSIDFromString StrPtr("{557CF401-1A04-11D3-9A73-0000F81EF32E}"), tJpgEncoder
tParams.Count = 1
With tParams.Parameter ' Quality
CLSIDFromString StrPtr("{1D5BE4B5-FA4A-452D-9CDD-5DB35105E7EB}"), .GUID
.NumberOfValues = 1
.Type = 4
.Value = VarPtr(quality)
End With
lRes = GdipSaveImageToFile(lBitmap, StrPtr(FileFullName), tJpgEncoder, tParams)
GdipDisposeImage lBitmap
End If
GdiplusShutdown lGDIP
End If
StdPictureSave2JPG = Not lRes
End Function

复制代码

**************************************************

关于VFW和GDI+的使用，需要使用者具备一定的API知识，代码没什么难度，会抄就行。关键是肯不肯静下心来慢慢学习。

API不可怕，觉得它可怕的，一般都是没自信，被长长的参数调用给吓跑了。

{:soso_e113:}

kangatang · 发表于 2013-3-23 15:41

学习一下，这次没把核心部分做成DLL，非常感谢。

另外，如果用手机摄像头做PC的外置摄像头，是否有这可能？

liucqa · 发表于 2013-3-23 15:50

kangatang 发表于 2013-3-23 15:41
学习一下，这次没把核心部分做成DLL，非常感谢。

另外，如果用手机摄像头做PC的外置摄像头，是否有这可能 ...

如果你能搞到驱动，自然就行{:soso_e151:}

geryjun · 发表于 2013-3-23 20:34

好东西来的，有空试试看。

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[求助] 做了一个摄像头采集照片的程序，采用VFW和GDI

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