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            隨筆 - 74, 文章 - 0, 評論 - 26, 引用 - 0
            數據加載中……

            IBasicVideo::GetCurrentImage 抓圖

            http://www.geekpage.jp/en/programming/directshow/getcurrentimage.php

            #include <stdio.h>
            #include <dshow.h>
            // change here
            #define	FILENAME L"C:\\DXSDK\\Samples\\Media\\butterfly.mpg"
            // note that this sample fails on some environment
            int
            main()
            {
            IGraphBuilder *pGraphBuilder;
            IMediaControl *pMediaControl;
            IBasicVideo *pBasicVideo;
            CoInitialize(NULL);
            CoCreateInstance(CLSID_FilterGraph,
            NULL,
            CLSCTX_INPROC,
            IID_IGraphBuilder,
            (LPVOID *)&pGraphBuilder);
            pGraphBuilder->QueryInterface(IID_IMediaControl,
            (LPVOID *)&pMediaControl);
            pMediaControl->RenderFile(FILENAME);
            
            pGraphBuilder->QueryInterface(IID_IBasicVideo,
            (LPVOID *)&pBasicVideo);
            
            pMediaControl->Run();
            // The image will be saved when OK is clicked
            MessageBox(NULL,
            "Grab Image",
            "Grab",
            MB_OK);
            
            // Must Pause before using GetCurrentImage
            pMediaControl->Pause();
            // get width and height
            long height, width;
            pBasicVideo->get_VideoHeight(&height);
            pBasicVideo->get_VideoWidth(&width);
            long bufSize;
            long *imgData;
            HRESULT hr;
            /*
            The second value is NULL to resolve required buffer size.
            The required buffer size will be returned in variable "bufSize".
            */
            hr = pBasicVideo->GetCurrentImage(&bufSize, NULL);
            if (FAILED(hr)) {
            printf("GetCurrentImage failed\n");
            return 1;
            }
            if (bufSize < 1) {
            printf("failed to get data size\n");
            return 1;
            }
            imgData = (long *)malloc(bufSize);
            // The data will be in DIB format
            pBasicVideo->GetCurrentImage(&bufSize, imgData);
            
            // save DIB file as Bitmap.
            // This sample saves image as bitmap to help
            // understanding the sample.
            HANDLE fh;
            BITMAPFILEHEADER bmphdr;
            BITMAPINFOHEADER bmpinfo;
            DWORD nWritten;
            memset(&bmphdr, 0, sizeof(bmphdr));
            memset(&bmpinfo, 0, sizeof(bmpinfo));
            bmphdr.bfType = ('M' << 8) | 'B';
            bmphdr.bfSize = sizeof(bmphdr) + sizeof(bmpinfo) + bufSize;
            bmphdr.bfOffBits = sizeof(bmphdr) + sizeof(bmpinfo);
            bmpinfo.biSize = sizeof(bmpinfo);
            bmpinfo.biWidth = width;
            bmpinfo.biHeight = height;
            bmpinfo.biPlanes = 1;
            bmpinfo.biBitCount = 32;
            fh = CreateFile("result.bmp",
            GENERIC_WRITE, 0, NULL,
            CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
            WriteFile(fh, &bmphdr, sizeof(bmphdr), &nWritten, NULL);
            WriteFile(fh, &bmpinfo, sizeof(bmpinfo), &nWritten, NULL);
            WriteFile(fh, imgData, bufSize, &nWritten, NULL);
            CloseHandle(fh);
            
            free(imgData);
            // Release resource
            pBasicVideo->Release();
            
            pMediaControl->Release();
            pGraphBuilder->Release();
            CoUninitialize();
            return 0;
            }

            posted on 2007-11-19 08:40 井泉 閱讀(3573) 評論(0)  編輯 收藏 引用 所屬分類: C++

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