請教各位前輩: 我已可以利用DirectShow做ccd擷取影像動作， 但不知該如何取得單張影像資料？.....Thanks!

引言: 我已可以利用DirectShow做ccd擷取影像動作

hcw大大您好: 可否分享您的大作，謝謝

不之先進可否將程式PO上來.....好讓大家可以學習..有問題大家一起討論...謝謝...

以下程式是我從direct X 8 的範例抄下來的，所以DirectShow的原理我也不清楚、不過我試過可以Run。      請教各位前輩可以教我如何取得單張影像資料??....thanks!    IVideoWindow  * g_pVW = NULL; IMediaControl * g_pMC = NULL; IMediaEventEx * g_pME = NULL; IGraphBuilder * g_pGraph = NULL; ICaptureGraphBuilder2 * g_pCapture = NULL; IBaseFilter *pSrcFilter=NULL; IBaseFilter * pSrc = NULL;    HRESULT init(HWND hWnd) {    CoInitialize(NULL);    CoCreateInstance (CLSID_FilterGraph, NULL,CLSCTX_INPROC,        IID_IGraphBuilder, (void **) &g_pGraph);    CoCreateInstance (CLSID_CaptureGraphBuilder2 , NULL,                               CLSCTX_INPROC ,IID_ICaptureGraphBuilder2,                      (void **) &g_pCapture);    g_pGraph->QueryInterface(IID_IMediaControl,(LPVOID *) &g_pMC);    g_pGraph->QueryInterface(IID_IVideoWindow, (LPVOID *) &g_pVW);    g_pGraph->QueryInterface(IID_IMediaEvent, (LPVOID *) &g_pME);    g_pCapture->SetFiltergraph(g_pGraph);       CComPtr  pDevEnum =NULL; CoCreateInstance (CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC , IID_ICreateDevEnum, (void ** ) &pDevEnum); CComPtr pClassEnum = NULL; pDevEnum->CreateClassEnumerator (CLSID_VideoInputDeviceCategory, &pClassEnum, 0); if (S_OK == (pClassEnum->Next (1, &pMoniker, &cFetched))) { hr = pMoniker->BindToObject(0,0,IID_IBaseFilter, (void**) &pSrc); } else { Msg(TEXT("Unable to access video capture device!")); return E_FAIL; } pSrcFilter = pSrc; g_pGraph->AddFilter(pSrcFilter, L"Video Capture"); g_pCapture->RenderStream (&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video, pSrcFilter, NULL, NULL); g_pVW->SetWindowPosition(0, 0, 640, 480); g_pVW->put_Owner((OAHWND)hWnd); g_pVW->put_WindowStyle(WS_CHILD | WS_CLIPCHILDREN); g_pVW->put_Visible(OATRUE); g_pME->SetNotifyWindow((OAHWND)hWnd,WM_APP 1, 1); g_pMC->Run(); } void colse_itf() { g_pGraph->Release(); g_pCapture->Release(); g_pMC->Release(); g_pVW->Release(); g_pME->Release(); ppf->Release(); pSink->Release(); pSrcFilter->Release(); }

IVideoWindow * g_pVW = NULL;
IMediaControl * g_pMC = NULL;
IMediaEventEx * g_pME = NULL;
IGraphBuilder * g_pGraph = NULL;
ICaptureGraphBuilder2 * g_pCapture = NULL;
IBaseFilter *pSrcFilter=NULL;
IBaseFilter * pSrc = NULL;

-- 我在這幾行compiler就不過了,要加入什麼東西嗎..麻煩再教一下

引言:

IVideoWindow * g_pVW = NULL;
IMediaControl * g_pMC = NULL;
IMediaEventEx * g_pME = NULL;
IGraphBuilder * g_pGraph = NULL;
ICaptureGraphBuilder2 * g_pCapture = NULL;
IBaseFilter *pSrcFilter=NULL;
IBaseFilter * pSrc = NULL;

-- 我在這幾行compiler就不過了,要加入什麼東西嗎..麻煩再教一下

可能要include vc的環境要設定如下: tools-->Options-->Directories include要指向directX sdk目錄下的include子目錄，並將該項移到第一個。 library也要指向directX sdk目錄下的lib子目錄，並將該項移到第一個。 project-->settings-->link 在object/library modules中加入Strmiids.lib strmbasd.lib 這樣試試看吧!

我是用這個函式來取得單幅圖案.

procedure TformHunter.getSnapShot;
var
   mt : TAMMEDIATYPE ;
   mt2 : TAMMEDIATYPE ;
   hdc: Hwnd;
   iBitDepth: integer;
   pSrc: IBaseFilter ;
   GrabIn, GrabOut, pOut:IPin;
   pins: IEnumPins;
   cbBuffer : longint;
   pBuffer: array of char;
   pVih : TVIDEOINFOHEADER;
   snapshot: tbitmap;
   buffer : PByteArray;
   size: integer;
   bv: IBasicVideo;
   lWidth, lHeight: longint;
   pDIB: ^timage;
   evCode: integer;
   bitmapinfo: tbitmapinfo;
   xbitmap: hbitmap;
   mybitmap: tbitmap;
   wd, hd: integer;
begin
   hr := pGrabber.SetBufferSamples(TRUE);
//   hr:= pEvent.WaitForCompletion(INFINITE, evCode);
   hr := pGrabber.SetOneShot(TRUE);
//   hr:= pEvent.WaitForCompletion(INFINITE, evCode);
   ZeroMemory(@mt, sizeof(TAM_MEDIA_TYPE));
   hr := pGrabber.GetConnectedMediaType(mt);
   // Get a pointer to the video header.
   pVih := TVIDEOINFOHEADER(Mt.pbFormat^);
 //  if (pVih = NiL) then showmessage('E_FAIL');
   // The video header contains the bitmap information.
   // Copy it into a BITMAPINFO structure.
   ZeroMemory(@BitmapInfo, sizeof(TBitmapInfo));
   CopyMemory(@BitmapInfo.bmiHeader, @(pVih.bmiHeader), sizeof(TBITMAPINFOHEADER));
   xBitmap := CreateDIBSection(0, BitmapInfo, DIB_RGB_COLORS,pointer( buffer) ,Thandle(nil), 0);
   GdiFlush();
   size:=0;
   hr := pGrabber.GetCurrentBuffer(size,nil);
//   hr:= pEvent.WaitForCompletion(INFINITE, evCode);
   hr := pGrabber.GetCurrentBuffer(size,buffer);
    if (hr=E_invalidarg) then showmessage('invalidarg');
    if (hr=E_pointer) then showmessage('E_pointer');
    if (hr=E_OUTOFMEMORY) then showmessage('Out of memory.');
    if (hr=VFW_E_WRONG_STATE) then showmessage('No Sample yet.');
//   hr:= pEvent.WaitForCompletion(INFINITE, evCode);
   // Copy the image into the buffer.
   mybitmap:=tbitmap.create;
   wd:=640;  hd:=480;
   mybitmap.height:=hd;  mybitmap.width:=wd;
   mybitmap.pixelformat:=pf24bit;
   image_snapshot.picture.bitmap.pixelformat:=pf24bit;
//   StretchDIBits(image_snapshot.canvas.handle, 0, 0, wd, hd,
//           0, 0, wd, hd, buffer, bitmapinfo, 0, SRCCOPY)   ;
//   setDiBBits(
   StretchDIBits(image_snapshot.picture.bitmap.canvas.handle, 0, 0, wd, hd,
           0, 0, wd, hd, buffer, bitmapinfo, 0, SRCCOPY)   ;
//   image_snapshot.Canvas.CopyRect(Rect(0,0,640,480), mybitmap.Canvas,rect(0,0,640,479));
   mybitmap.free;    end; //getSnapShot;

gogowin 發表人 - taishyang 於 2003/10/29 20:49:13

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gogowin