如何将IStream 保存为AVI视频

2010-10-05 09:26:40 105 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

STM32 HAL库下DHT22高精度温湿度采集与30秒定时实现单总线传感器（如DHT22）是嵌入式环境监测系统的核心数据源，其通信依赖微秒级精确时序控制。在STM32平台中，需结合硬件定时器（如TIM2）构建稳定周期触发机制，并通过GPIO+精确延时（非HAL_Delay）完成协议解析。该方案突破整数读取局限，完整还原带一位小数的温度与湿度值，显著提升工业级数据精度。典型应用于物联网终端、智能农业节点及边缘侧环境监控系统，为MQTT/CoAP等协议上报提供结构化原始数据支撑。本实践基于STM32F103与HAL库，不依赖第三方驱动，具备强可移植性与工程鲁棒性。阅读详情

Hi all，
如题
本人写的代码如下，但只能显示图像，不能保存avi，没有头绪怎么保存avi：

 void CJpegTestDlg::OnSaveVideo() 

{



    

    HRESULT hr;

    

    char url[1000] = "http://192.168.223.128:8080/?action=snapshot";

    

    

    HINTERNET internet= InternetOpen("HTTP Downloader",INTERNET_OPEN_TYPE_PRECONFIG,

        NULL,NULL, NULL);

    

    if( !internet )

    {

        MessageBox(" 没有视频信号");

        return ;

    }

    

    HINTERNET file_handle = InternetOpenUrl(internet, url, NULL, 0, INTERNET_FLAG_RELOAD, 0);

    if( !file_handle)

        return ;

    

    

    HGLOBAL hImageMemory_1=GlobalAlloc(GMEM_MOVEABLE, 2097152); //给图片分配全局内存

    if( hImageMemory_1==NULL)

    {

        AfxMessageBox(" 没有分配内存");

        return ;

    }

    

    void *pImageMemory_1=GlobalLock(hImageMemory_1); //锁定内存

    DWORD bytes_read; 

    //DWORD dwReadedSize; //保存实际读取的文件大小

    BOOL b = InternetReadFile(file_handle,pImageMemory_1,2097152,&bytes_read);

    GlobalUnlock(hImageMemory_1); //解锁内存

    

    CloseHandle(file_handle); //关闭文件句柄

    

    

    if(!b)

        return;

    

    CDC* pDC = GetDlgItem(IDC_ShowImg) ->GetDC();

    HDC hDC = pDC ->GetSafeHdc();

    CRect rect;

    GetDlgItem(IDC_ShowImg) ->GetClientRect( &rect );

    

    

    //HRESULT hr;

    IStream *pIStream;//创建一个IStream接口指针，用来保存图片流

    IPicture *pIPicture;//创建一个IPicture接口指针，表示图片对象

    hr = CreateStreamOnHGlobal(hImageMemory_1, false, &pIStream); //用全局内存初使化IStream接口指针

    ASSERT(SUCCEEDED(hr));

    

    hr = OleLoadPicture(pIStream, 0, false, IID_IPicture, (LPVOID*)&(pIPicture));//用OleLoadPicture获得IPicture接口指针

    ASSERT(SUCCEEDED(hr));

    

    long hmWidth;

    long hmHeight;

    

    pIPicture->get_Width(&hmWidth); //用接口方法获得图片的宽和高

    pIPicture->get_Height(&hmHeight);

    pIPicture->Render(hDC,0,0,800,600,0,hmHeight,hmWidth,-hmHeight,NULL); 

    

    //*********************AVI********

    

    AVIFileInit(); 

    AVISTREAMINFO strhdr;

    PAVIFILE m_aviFile;

    PAVISTREAM m_aviVideoStream; 

    int m_aviVideoFrames=0;

    LPTSTR aviFileFullName = _T("MyAVI.avi");

    while(1)

    {

        

        

        //AVIFILEINFO aviFileInfo = {0};

        //PAVIFILE pfile;

        

        

        

        CoInitialize(NULL);

        int ret = 0,n = 0;

        

        CoInitialize(NULL);

        

        ret = AVIFileOpen(&m_aviFile,aviFileFullName,OF_WRITE | OF_CREATE,NULL);

        n = GetLastError();

        

        if (ret!=AVIERR_OK)

        {

            if (m_aviFile!=NULL)

                AVIFileRelease(m_aviFile);

            //MessageBox("error"); 

            return ;

        }

        

        AVISTREAMINFOW m_aviVideoStreamInfo; 

        m_aviVideoStreamInfo.fccType = streamtypeVIDEO; 

        m_aviVideoStreamInfo.fccHandler = 0; 

        m_aviVideoStreamInfo.dwFlags = 0; 

        m_aviVideoStreamInfo.dwCaps = 0; 

        m_aviVideoStreamInfo.wPriority = 0; 

        m_aviVideoStreamInfo.wLanguage = 0; 

        m_aviVideoStreamInfo.dwRate = 5; //每秒5帧 

        m_aviVideoStreamInfo.dwScale = 1; 

        m_aviVideoStreamInfo.dwQuality = 0; 

        m_aviVideoStreamInfo.dwSuggestedBufferSize = 1024*768*8; 

        m_aviVideoStreamInfo.dwStart = 0; 

        m_aviVideoStreamInfo.dwInitialFrames = 0; 

        m_aviVideoStreamInfo.dwSampleSize = 0; 

        m_aviVideoStreamInfo.rcFrame.left = 0; 

        m_aviVideoStreamInfo.rcFrame.top = 0; 

        m_aviVideoStreamInfo.rcFrame.right = 800; 

        m_aviVideoStreamInfo.rcFrame.bottom = 600; 

        m_aviVideoStreamInfo.dwEditCount = 0; 

        m_aviVideoStreamInfo.dwFormatChangeCount = 0; 

        strcpy((char *)m_aviVideoStreamInfo.szName,"ScreenCap.avi"); 

        m_aviVideoStreamInfo.dwLength = 0; 

        

        AVIFileCreateStream(m_aviFile,&m_aviVideoStream,(AVISTREAMINFO *)&m_aviVideoStreamInfo); 

        

        BITMAPINFOHEADER bmpInfoHdr; 

        bmpInfoHdr.biSize = sizeof(BITMAPINFOHEADER); 

        bmpInfoHdr.biWidth = 800; 

        bmpInfoHdr.biHeight = 600; 

        bmpInfoHdr.biBitCount = 8;

        bmpInfoHdr.biCompression = BI_RGB; 

        bmpInfoHdr.biSizeImage = 0; 

        bmpInfoHdr.biClrImportant = 0; 

        bmpInfoHdr.biClrUsed = 0; 

        bmpInfoHdr.biXPelsPerMeter = 0; 

        bmpInfoHdr.biYPelsPerMeter = 0; 

        bmpInfoHdr.biPlanes = 1;

        AVIStreamSetFormat(m_aviVideoStream,m_aviVideoFrames,&bmpInfoHdr,sizeof(bmpInfoHdr)); 

        

        //写数据 

        CreateStreamOnHGlobal(NULL,TRUE,&pIStream);   

        LONG   size;   

        hr=pIPicture->SaveAsFile(pIStream,TRUE,&size);  

        

        LARGE_INTEGER   li;   

        li.HighPart   =0;   

        li.LowPart   =0;   

        ULARGE_INTEGER   ulnewpos;   

        pIStream->Seek(  li,STREAM_SEEK_SET,&ulnewpos);   

        ULONG   uReadCount   =   1;   

        pIStream->Read(buffer,sizeof(buffer),&uReadCount);

        

        AVIStreamWrite(m_aviVideoStream,m_aviVideoFrames ,1,(LPBYTE) buffer,bmpInfoHdr.biSizeImage ,AVIIF_KEYFRAME,NULL,NULL); 

        

        m_aviVideoFrames++; 

        delete []buffer;

        

    }

    AVIStreamClose(m_aviVideoStream);

    if(m_aviFile!=NULL)

        AVIFileRelease(m_aviFile);

    AVIFileExit();

    

    

    

    

    

    //********************************************************

    

    GlobalFree(hImageMemory_1); //释放全局内存

    pIStream->Release(); //释放pIStream

    pIPicture->Release(); //释放pIPicture

    //::CoUninitialize();//删除此次告警就消失

    

    ::DeleteDC(hDC);

    pDC->DeleteDC();

    

    

    CoUninitialize();

    

    InternetCloseHandle(internet);

}