佳能EDSDK将图像保存在我的PC中 [英] canon EDSDK saving image in my PC

问题描述

我在EOS 50D相机上使用EDSDK v2.13.我想将拍摄的照片保存在主机中.我正在使用此代码(c ++):

I am using EDSDK v2.13 with my EOS 50D camera. I want to save taken pictures in my host. I am using this code (c++):

    EdsOpenSession(camera);
    EdsInt32 saveTarget = kEdsSaveTo_Both;
    err = EdsSetPropertyData( camera, kEdsPropID_SaveTo, 0, 4, &saveTarget );

    EdsCapacity newCapacity = {0x7FFFFFFF, 0x1000, 1};
    err = EdsSetCapacity(camera, newCapacity);

  const char* ch_dest = "C:\\photo\\Img.jpg";
  EdsCreateFileStreamEx( ch_dest ,kEdsFileCreateDisposition_CreateNew,kEdsAccess_ReadWrite, 0);

    EdsSendCommand(camera, kEdsCameraCommand_TakePicture, 0);
    EdsCloseSession(camera);
    EdsTerminateSDK();

相机快门正常闪光，我在相机的存储卡中找到了图片，但在PC上找不到它.

The camera shutter fires normally and I find the picture in the memory card of my camera but I cannot find it in my PC.

请帮助.

推荐答案

它不能那样工作.拍摄完照片后，您需要捕获ObjectEvent，然后下载文件.它的工作原理如下:

it doesn't work that way. After you have taken the photo you need to catch the ObjectEvent and then download the file. It works something like this:

• 公开会议
• 设置SaveTo_Both或主机
• 设置容量
• 使用EdsSetObjectEventHandler订阅对象事件
• 拍照
• 对象事件应以"inEvent"为"kEdsObjectEvent_DirItemRequestTransfer"触发
• 下载数据:
  • 通过EdsGetDirectoryItemInfo获取信息，其中事件中"inDirItemRef"为"inRef"
  • 使用EdsCreateFileStream创建文件流
  • 使用EdsDownload下载数据(事件中的inRef，DirectoryItemInfo中的大小)
  • 使用EdsDownloadComplete(事件中的inRef)标记为完成
  • 使用EdsRelease(事件中的inRef)释放数据
  • 使用EdsRelease释放流

  很抱歉，我无法为您提供实际的代码，我不是C ++开发人员.如果您愿意，我可以向您展示一些C#代码.要获得有关这些功能如何工作的更多详细信息，您还可以查看SDK的文档.

  I'm sorry that I can't provide you actual code, I'm not a C++ developer. If you want I can show you some C# code though. To get more details on how the functions work, you could also check the documentation of the SDK.

  亲切的问候

  好吧，在文档的帮助下，一些C ++代码:请注意，这就是它以barest形式工作的方式.您应该始终检查err！= EDS_ERR_OK.而且，只有在下载图像后，您才应该调用关闭".

  Ok, some C++ code with help of the documentation: Note that this is how it would work in it's barest form. You should always check if err != EDS_ERR_OK. And you should call Close only after the image has been downloaded.

  void TakePhoto()
  {
      EdsError err = EDS_ERR_OK;
      EdsCameraRef camera = NULL;
      EdsCameraListRef cameraList = NULL;
      EdsUInt32 count = 0;
  
      err = EdsInitializeSDK();
      err = EdsGetCameraList(&cameraList);
      err = EdsGetChildCount(cameraList, &count);
      if (count > 0)
      {
          err = EdsGetChildAtIndex(cameraList, 0, &camera);
          cameraList = NULL;
          err = EdsSetObjectEventHandler(camera, kEdsObjectEvent_All, handleObjectEvent, NULL);
          err = EdsOpenSession(camera);
          err = EdsSendCommand(camera, kEdsCameraCommand_TakePicture, 0);
      }
  }
  
  void Close(EdsCameraRef *camera)
  {
      err = EdsCloseSession(camera);
      EdsRelease(camera);
      EdsTerminateSDK();
  }
  
  static EdsError EDSCALLBACK handleObjectEvent(EdsObjectEvent event, EdsBaseRef object, EdsVoid * context)
  {
      if (event == kEdsObjectEvent_DirItemRequestTransfer)
      {
          EdsError err = EDS_ERR_OK;
          EdsStreamRef stream = NULL;
          EdsDirectoryItemInfo dirItemInfo;
          err = EdsGetDirectoryItemInfo(object, &dirItemInfo);
          err = EdsCreateFileStream(dirItemInfo.szFileName, kEdsFileCreateDisposition_CreateAlways, kEdsAccess_ReadWrite, &stream);
          err = EdsDownload(object, dirItemInfo.size, stream);
          err = EdsDownloadComplete(object);
          EdsRelease(stream);
          stream = NULL;
      }
      if (object) EdsRelease(object);
  }
  

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