一、创建工程 {#一、创建工程}

创建一个MFC对话框程序，工程起名为CameraVCTest。

二、设置按钮 {#二、设置按钮}

删除无用的控件和按钮。
添加一个图片控件，ID为IDC_PICTURE，并为其添加CStatic类型变量m_picture。
添加四个按钮，名称分别为预览，拍照，保存，关闭。
ID分别为IDC_VIEW,IDC_TAKEPHOTO,IDC_SAVE,IDC_CLOSE。
分别为其添加变量m_view,m_takePhoto,m_save,m_close。
双击四个按钮，生成四个响应函数。

三、准备DirectShow {#三、准备DirectShow}

将DirectShow文件夹和CameraDS类的头文件和源文件拷贝到项目源文件夹下。
并在项目属性VC++ Directories 添加include Directories，".\DirectShow"。
在Solution Exlporer添加上CameraDS类的头文件和源文件。

四、实现代码 {#四、实现代码}

在CCameraVCTestDlg 类的头文件中，添加

|---------------|----------------------------------------------------------------------| | 1 2 3 | #include "CameraDS.h" #include <vector> using namespace std; |

添加公共变量和方法

|------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | 1 2 3 4 5 6 7 8 9 10 11 12 | vector<CCameraDS> cameralist; CImage *m_pImage; void ShowPicture(CImage *img,CStatic *pic); void SaveCard(CImage *img); int m_cam_count; bool isBreak; CString m_savePath; CString savePath; int m_saveIndex; int m_fileCount; |

在源文件的初始化函数里添加：

|---------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | 1 2 3 4 5 6 7 8 9 10 11 | m_cam_count = CCameraDS::CameraCount(); cameralist.resize(m_cam_count); if(! cameralist[m_cam_count-1].OpenCamera(m_cam_count-1, false, 640,480)) { return FALSE; } this->isBreak = false; this->isSave = false; this->m_view.EnableWindow(TRUE); this->m_takePhoto.EnableWindow(FALSE); this->m_save.EnableWindow(FALSE); |

添加如下函数

添加视频帧显示函数

|---------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | void CCameraVCTestDlg::ShowPicture(CImage *img,CStatic *pic) { if(img==NULL) { return ; } int width = img->GetWidth(); int height = img->GetHeight(); CRect picRect; this->m_picture.GetClientRect(&picRect); CRect rt(picRect); CDC* dc = this->m_picture.GetDC(); CBrush *pBrush = CBrush::FromHandle((HBRUSH)GetStockObject(WHITE_BRUSH)); //dc->FillRect(rt, pBrush); if(picRect.Height()*width > height*picRect.Width()) { CPoint p1(0,(picRect.Height()-(picRect.Width()*height/width))/2); CPoint p2(picRect.Width(),(picRect.Height() - p1.y)); rt.SetRect(p1,p2); } else { CPoint p1((picRect.Width()-(picRect.Height()*width/height))/2,0); CPoint p2(picRect.Width()-p1.x,picRect.Height()); rt.SetRect(p1,p2); } // } // this->ShowMouseCursor(CursorTag); ::SetStretchBltMode(dc->m_hDC,HALFTONE); img->Draw(dc->m_hDC, rt); } |

添加关闭程序

|---------------------|----------------------------------------------------------------------------------------------| | 1 2 3 4 5 6 | void CCameraVCTestDlg::OnBnClickedClose() { this->isBreak = true; this->OnClose(); } |

好了，现在对话框上，点击预览按钮，就可以打开摄像头了，若还需要什么功能自己添加吧，如有问题，可以一起交流。欢迎不吝赐教。

Camera.h {#Camera-h}

camera.cpp {#camera-cpp}

|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 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CCameraDS::CCameraDS() { m_bConnected =false; m_nWidth =0; m_nHeight =0; m_bLock =false; m_bChanged =false; // m_pFrame = NULL; m_nBufferSize =0; m_pNullFilter = NULL; m_pMediaEvent = NULL; m_pSampleGrabberFilter = NULL; m_pGraph = NULL; CoInitialize(NULL); } CCameraDS::~CCameraDS() { CloseCamera(); CoUninitialize(); } void CCameraDS::CloseCamera() { if(m_bConnected) m_pMediaControl->Stop(); m_pGraph = NULL; m_pDeviceFilter = NULL; m_pMediaControl = NULL; m_pSampleGrabberFilter = NULL; m_pSampleGrabber = NULL; m_pGrabberInput = NULL; m_pGrabberOutput = NULL; m_pCameraOutput = NULL; m_pMediaEvent = NULL; m_pNullFilter = NULL; m_pNullInputPin = NULL; //if (m_pFrame) // cvReleaseImage(&m_pFrame); if(!this->m_image.IsNull()) { this->m_image.Destroy(); } m_bConnected =false; m_nWidth =0; m_nHeight =0; m_bLock =false; m_bChanged =false; m_nBufferSize =0; } bool CCameraDS::OpenCamera(int nCamID, bool bDisplayProperties, int nWidth, int nHeight) { HRESULT hr = S_OK; CoInitialize(NULL); // Create the Filter Graph Manager. hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC, IID_IGraphBuilder, (void**)&m_pGraph); hr = CoCreateInstance(CLSID_SampleGrabber, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (LPVOID *)&m_pSampleGrabberFilter); hr = m_pGraph->QueryInterface(IID_IMediaControl, (void**) &m_pMediaControl); hr = m_pGraph->QueryInterface(IID_IMediaEvent, (void**) &m_pMediaEvent); hr = CoCreateInstance(CLSID_NullRenderer, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (LPVOID*) &m_pNullFilter); hr = m_pGraph->AddFilter(m_pNullFilter, L"NullRenderer"); hr = m_pSampleGrabberFilter->QueryInterface(IID_ISampleGrabber, (void**)&m_pSampleGrabber); AM_MEDIA_TYPE mt; ZeroMemory(&mt, sizeof(AM_MEDIA_TYPE)); mt.majortype = MEDIATYPE_Video; mt.subtype = MEDIASUBTYPE_RGB24; mt.formattype = FORMAT_VideoInfo; hr = m_pSampleGrabber->SetMediaType(&mt); MYFREEMEDIATYPE(mt); m_pGraph->AddFilter(m_pSampleGrabberFilter, L"Grabber"); // Bind Device Filter. We know the device because the id was passed in BindFilter(nCamID, &m_pDeviceFilter); m_pGraph->AddFilter(m_pDeviceFilter, NULL); CComPtr<IEnumPins> pEnum; m_pDeviceFilter->EnumPins(&pEnum); hr = pEnum->Reset(); hr = pEnum->Next(1, &m_pCameraOutput, NULL); pEnum = NULL; m_pSampleGrabberFilter->EnumPins(&pEnum); pEnum->Reset(); hr = pEnum->Next(1, &m_pGrabberInput, NULL); pEnum = NULL; m_pSampleGrabberFilter->EnumPins(&pEnum); pEnum->Reset(); pEnum->Skip(1); hr = pEnum->Next(1, &m_pGrabberOutput, NULL); pEnum = NULL; m_pNullFilter->EnumPins(&pEnum); pEnum->Reset(); hr = pEnum->Next(1, &m_pNullInputPin, NULL); //SetCrossBar(); if (bDisplayProperties) { CComPtr<ISpecifyPropertyPages> pPages; HRESULT hr = m_pCameraOutput->QueryInterface(IID_ISpecifyPropertyPages, (void**)&pPages); if (SUCCEEDED(hr)) { PIN_INFO PinInfo; m_pCameraOutput->QueryPinInfo(&PinInfo); CAUUID caGUID; pPages->GetPages(&caGUID); OleCreatePropertyFrame(NULL, 0, 0, L"Property Sheet", 1, (IUnknown **)&(m_pCameraOutput.p), caGUID.cElems, caGUID.pElems, 0, 0, NULL); CoTaskMemFree(caGUID.pElems); PinInfo.pFilter->Release(); } pPages = NULL; } else { // // 加入由 lWidth和lHeight设置的摄像头的宽和高的功能，默认320*240 // by flymanbox @2009-01-24 // int _Width = nWidth, _Height = nHeight; IAMStreamConfig* iconfig; iconfig = NULL; hr = m_pCameraOutput->QueryInterface(IID_IAMStreamConfig, (void**)&iconfig); AM_MEDIA_TYPE* pmt; if(iconfig->GetFormat(&pmt) !=S_OK) { //printf("GetFormat Failed ! \n"); return false; } VIDEOINFOHEADER* phead; if ( pmt->formattype == FORMAT_VideoInfo) { phead=( VIDEOINFOHEADER*)pmt->pbFormat; phead->bmiHeader.biWidth = _Width; phead->bmiHeader.biHeight = _Height; if(( hr=iconfig->SetFormat(pmt)) != S_OK ) { returnfalse; } } iconfig->Release(); iconfig=NULL; MYFREEMEDIATYPE(*pmt); } hr = m_pGraph->Connect(m_pCameraOutput, m_pGrabberInput); hr = m_pGraph->Connect(m_pGrabberOutput, m_pNullInputPin); if (FAILED(hr)) { switch(hr) { case VFW_S_NOPREVIEWPIN : break; case E_FAIL : break; case E_INVALIDARG : break; case E_POINTER : break; } } m_pSampleGrabber->SetBufferSamples(TRUE); m_pSampleGrabber->SetOneShot(TRUE); hr = m_pSampleGrabber->GetConnectedMediaType(&mt); if(FAILED(hr)) returnfalse; VIDEOINFOHEADER *videoHeader; videoHeader = reinterpret_cast<VIDEOINFOHEADER*>(mt.pbFormat); m_nWidth = videoHeader->bmiHeader.biWidth; m_nHeight = videoHeader->bmiHeader.biHeight; m_bConnected =true; pEnum = NULL; returntrue; } bool CCameraDS::BindFilter(int nCamID, IBaseFilter **pFilter) { if (nCamID <0) returnfalse; // enumerate all video capture devices CComPtr<ICreateDevEnum> pCreateDevEnum; HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER, IID_ICreateDevEnum, (void**)&pCreateDevEnum); if (hr != NOERROR) { returnfalse; } CComPtr<IEnumMoniker> pEm; hr = pCreateDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory, &pEm, 0); if (hr != NOERROR) { returnfalse; } pEm->Reset(); ULONG cFetched; IMoniker *pM; int index =0; while(hr = pEm->Next(1, &pM, &cFetched), hr==S_OK, index <= nCamID) { IPropertyBag *pBag; hr = pM->BindToStorage(0, 0, IID_IPropertyBag, (void**)&pBag); if(SUCCEEDED(hr)) { VARIANT var; var.vt = VT_BSTR; hr = pBag->Read(L"FriendlyName", &var, NULL); if (hr == NOERROR) { if (index == nCamID) { pM->BindToObject(0, 0, IID_IBaseFilter, (void**)pFilter); } SysFreeString(var.bstrVal); } pBag->Release(); } pM->Release(); index++; } pCreateDevEnum = NULL; returntrue; } //将输入crossbar变成PhysConn_Video_Composite void CCameraDS::SetCrossBar() { int i; IAMCrossbar *pXBar1 = NULL; ICaptureGraphBuilder2 *pBuilder = NULL; HRESULT hr = CoCreateInstance(CLSID_CaptureGraphBuilder2, NULL, CLSCTX_INPROC_SERVER, IID_ICaptureGraphBuilder2, (void**)&pBuilder); if (SUCCEEDED(hr)) { hr = pBuilder->SetFiltergraph(m_pGraph); } hr = pBuilder->FindInterface(&LOOK_UPSTREAM_ONLY, NULL, m_pDeviceFilter,IID_IAMCrossbar, (void**)&pXBar1); if (SUCCEEDED(hr)) { long OutputPinCount; long InputPinCount; long PinIndexRelated; long PhysicalType; long inPort =0; long outPort =0; pXBar1->get_PinCounts(&OutputPinCount,&InputPinCount); for( i =0;i<InputPinCount;i++) { pXBar1->get_CrossbarPinInfo(TRUE,i,&PinIndexRelated,&PhysicalType); if(PhysConn_Video_Composite==PhysicalType) { inPort = i; break; } } for( i =0;i<OutputPinCount;i++) { pXBar1->get_CrossbarPinInfo(FALSE,i,&PinIndexRelated,&PhysicalType); if(PhysConn_Video_VideoDecoder==PhysicalType) { outPort = i; break; } } if(S_OK==pXBar1->CanRoute(outPort,inPort)) { pXBar1->Route(outPort,inPort); } pXBar1->Release(); } pBuilder->Release(); } /* The returned image can not be released. //*/ //IplImage* CCameraDS::QueryFrame() //{ // // long evCode; // long size = 0; // // m_pMediaControl->Run(); // m_pMediaEvent->WaitForCompletion(INFINITE, &evCode); // // m_pSampleGrabber->GetCurrentBuffer(&size, NULL); // ////if the buffer size changed // if (size != m_nBufferSize) // { // if (m_pFrame) // cvReleaseImage(&m_pFrame); // // m_nBufferSize = size; // m_pFrame = cvCreateImage(cvSize(m_nWidth, m_nHeight), IPL_DEPTH_8U, 3); // } // if (m_pFrame == NULL) return NULL; // m_pSampleGrabber->GetCurrentBuffer(&m_nBufferSize, (long*)m_pFrame->imageData); // cvFlip(m_pFrame); // // return m_pFrame; //} CImage* CCameraDS::QueryFrame2() { /*if(!m_image.IsNull()) { m_image.Destroy(); }*/ long evCode; long size =0; m_pMediaControl->Run(); m_pMediaEvent->WaitForCompletion(INFINITE, &evCode); m_pSampleGrabber->GetCurrentBuffer(&size, NULL); //if the buffer size changed if (size != m_nBufferSize) { //if (m_pImage != NULL )//|| !m_pImage->IsNull()) //{ // m_pImage->Destroy(); //} // cvReleaseImage(&m_pFrame); m_nBufferSize = size; //m_pFrame = cvCreateImage(cvSize(m_nWidth, m_nHeight), IPL_DEPTH_8U, 3); m_image.Create(m_nWidth,m_nHeight,24); } //if (m_pFrame == NULL) return NULL; if(m_image.IsNull()) { return0; } byte*q; byte*p =newbyte[m_nWidth*m_nHeight*3]; //m_pSampleGrabber->GetCurrentBuffer(&m_nBufferSize, (long*)m_pFrame->imageData); m_pSampleGrabber->GetCurrentBuffer(&m_nBufferSize, (long*)p); // cvFlip(m_pFrame); // for(int y=0, z=m_nHeight-1; y<m_nHeight,z>=0; y++,z--) { q = (byte*)m_image.GetPixelAddress(0,z); memcpy(q,&p[m_nWidth*3*y],m_nWidth*3); } delete []p; return&m_image; } int CCameraDS::CameraCount() { int count =0; CoInitialize(NULL); // enumerate all video capture devices CComPtr<ICreateDevEnum> pCreateDevEnum; HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER, IID_ICreateDevEnum, (void**)&pCreateDevEnum); CComPtr<IEnumMoniker> pEm; hr = pCreateDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory, &pEm, 0); if (hr != NOERROR) { return count; } pEm->Reset(); ULONG cFetched; IMoniker *pM; while(hr = pEm->Next(1, &pM, &cFetched), hr==S_OK) { count++; } pCreateDevEnum = NULL; pEm = NULL; return count; } int CCameraDS::CameraName(int nCamID, char* sName, int nBufferSize) { int count =0; CoInitialize(NULL); // enumerate all video capture devices CComPtr<ICreateDevEnum> pCreateDevEnum; HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER, IID_ICreateDevEnum, (void**)&pCreateDevEnum); CComPtr<IEnumMoniker> pEm; hr = pCreateDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory, &pEm, 0); if (hr != NOERROR) return0; pEm->Reset(); ULONG cFetched; IMoniker *pM; while(hr = pEm->Next(1, &pM, &cFetched), hr==S_OK) { if (count == nCamID) { IPropertyBag *pBag=0; hr = pM->BindToStorage(0, 0, IID_IPropertyBag, (void**)&pBag); if(SUCCEEDED(hr)) { VARIANT var; var.vt = VT_BSTR; hr = pBag->Read(L"FriendlyName", &var, NULL); //还有其他属性,像描述信息等等... if(hr == NOERROR) { //获取设备名称 WideCharToMultiByte(CP_ACP,0,var.bstrVal,-1,sName, nBufferSize ,"",NULL); SysFreeString(var.bstrVal); } pBag->Release(); } pM->Release(); break; } count++; } pCreateDevEnum = NULL; pEm = NULL; return1; } |

参考链接：https://blog.csdn.net/sdlypyzq/article/details/8785611