问题从佳能相机到电脑下载图片 [英] problem with download picture from canon camera to pc

问题描述

我连一个EOS佳能相机到电脑
我有，我可以拍照remotly，并下载图像到PC的应用程序，

i connected a eos canon camera to pc
i have an application that i could take picture remotly ,and download image to pc,

但是当我从相机中取出SD卡，我不能从缓冲下载图像到电脑

but when i remove the SD card from camera , i cant download image from buffer to pc

//注册objceteventcallback

// register objceteventcallback

err = EDSDK.EdsSetObjectEventHandler(obj.camdevice, EDSDK.ObjectEvent_All, objectEventHandler, new IntPtr(0));
              if (err != EDSDK.EDS_ERR_OK)
                 Debug.WriteLine("Error registering object event handler");

///

public uint objectEventHandler(uint inEvent, IntPtr inRef, IntPtr inContext)
        {
            switch(inEvent)
            {

                case EDSDK.ObjectEvent_DirItemCreated:

                    this.getCapturedItem(inRef);

                    Debug.WriteLine("dir item created");

                    break;
                case EDSDK.ObjectEvent_DirItemRequestTransfer:
                    this.getCapturedItem(inRef);
                    Debug.WriteLine("file transfer request event");
                    break;

                default:
                    Debug.WriteLine(String.Format("ObjectEventHandler: event {0}", inEvent));
                    break;
            }
            return 0;
        }

有人可以帮助我，为什么这个事件不打电话，

anyone could help me , why this event does not call ,

或如何我从缓冲区中下载图片到电脑，使用了具有SD卡上的我的相机

or how i download image from buffer to pc, with out have Sd card on my camera

感谢

推荐答案

您可能会遇到同样的问题，因为我昨天做：相机试图存储图像可下载以后，发现没有存储卡，将其存储到与立即丢弃的形象。

You probably ran into the same problem as I did yesterday: the camera tries to store the image for a later download, finds no memory card to store it to and instantly discards the image.

为了让您的回调，火，您需要将相机设置相机初始化程序中保存图像到PC（kEdsSaveTo_Host）在某一时刻。在C ++中，它的工作是这样的：

To get your callback to fire, you need to set the camera to save images to the PC (kEdsSaveTo_Host) at some point during your camera initialization routine. In C++, it worked like this:

    EdsInt32 saveTarget = kEdsSaveTo_Host;
    err = EdsSetPropertyData( _camera, kEdsPropID_SaveTo, 0, 4, &saveTarget );

您可能需要建立一个IntPtr这一点。至少，这就是德米特里Prozorovskiy都在的 akadunno 的提示） nofollow的>这个线程。

You probably need to build an IntPtr for this. At least, that's what Dmitriy Prozorovskiy did (prompted by a certain akadunno) in this thread.

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