EdsDownloadThumbnail

[lstevensuk]

Has anyone used the EdsDownloadThumbnail successfully? I can download an image no problems but this function is returning EDS_ERR_STREAM_SEEK_ERROR.

Do I use exactly the same method as downloading an Image? i.e.

EdsGetDirectoryItemInfo
EdsCreateFileStream
EdsDownloadThumbnail

Thanks

[FarmerDave]

I wrote a test app a couple of years ago to figure out the fastest way to download preview images. For some reason, I remembered EdsDownloadThumbnail to be problematic. I looked back through that old test app, and here's a comment I wrote to myself above the function that tested EdsDownloadThumbnail:

Code: Select all

' I could only ever get this to work in a narrow subset of conditions - basically, if the image was saved to the camera and then the DownloadThumbnail was
' invoked as a response to the creation of the directory item.  In that case, it sent down the "preview jpeg" of the RAW file - in the case of shooting a
' Jpeg, I got the jpeg itself, so it's probably not worth it.  Oh, and only saving to a memory stream seemed to work.

HTH,
David

[lstevensuk]

I thought it might be something obscure, thanks very much David saved me a lot of work!

Lee