QT使用canon sdk拍照并保存到本机的方法示例

EdsInitializeSDK();

  EdsCameraListRef cameraList = NULL;
  error = EdsGetCameraList(&cameraList);

  // 遍历相机列表对象，获取相机列表对象数量
  EdsUInt32 cameraCount = 0;
  error = EdsGetChildCount(cameraList, &cameraCount);
  if (error != EDS_ERR_OK)
  {
    qDebug() << "ERROR - failed to get camera count";
    EdsRelease(cameraList);
    return;
  }

  for (uint32_t idx = 0; idx < cameraCount; idx++)
  {
    // 获取单个相机对象
    EdsCameraRef cam = NULL;
    error = EdsGetChildAtIndex(cameraList, idx, &cam);
    m_camera = cam;
  }

EdsOpenSession(m_camera);

  EdsUInt32 saveTo = kEdsSaveTo_Both;    // 保存到相机和本机
  //EdsUInt32 saveTo = kEdsSaveTo_Host;  // 保存到本机
  error = EdsSetPropertyData(m_camera, kEdsPropID_SaveTo, 0, sizeof(saveTo), &saveTo);

  EdsCapacity capacity = {0x7FFFFFFF, 0x1000, 1};
  error = EdsSetCapacity(m_camera, capacity);

error = EdsSetObjectEventHandler(m_camera, kEdsObjectEvent_All, objectEventHandler, this);

EdsError EDSCALLBACK MainWindow::objectEventHandler(EdsUInt32 inEvent, EdsBaseRef inRef, EdsVoid* inContext)
{
  EdsStreamRef stream = NULL;
  EdsDirectoryItemInfo dirItemInfo;
  QString m("C:/Users/Administrator/Desktop/");
  switch (inEvent)
  {
   // 通知对象(如新文件夹或文件)的创建
   case kEdsObjectEvent_DirItemCreated:
      qDebug() << "Directory Item Created";
      break;
   // 通知相机上有物体要转移到计算机上。
   case kEdsObjectEvent_DirItemRequestTransfer:
      qDebug() << "Directory Item Requested Transfer";
      err = EdsGetDirectoryItemInfo(inRef, &dirItemInfo);
      m = m + dirItemInfo.szFileName;  // 拼接本地图片保存位置
      // 下载图片到本机
      err = EdsCreateFileStream(m.toStdString().data(), kEdsFileCreateDisposition_CreateAlways, kEdsAccess_ReadWrite, &stream);
      if (err != EDS_ERR_OK)
      {
       qDebug("failed to create file stream");
      }
      err = EdsDownload(inRef, dirItemInfo.size, stream);
      if (err != EDS_ERR_OK)
      {
       qDebug("failed to download");
      }
      err = EdsDownloadComplete(inRef);
      if (err != EDS_ERR_OK)
      {
        qDebug("failed to mark download as complete");
      }
      EdsRelease(stream);
      stream = NULL;
      break;
    default:
        qDebug() << "未知事件";
        break;
    }
   return EDS_ERR_OK;
}

error = EdsSendCommand(m_camera, kEdsCameraCommand_TakePicture, 0);

EdsCloseSession(m_camera); // 关闭相机会话

EdsTerminateSDK(); // 结束 sdk