Re: Using Image Acquisition Automation: how to display the thumbnail?

From: Jim Walsh (jwalshREM_at_OVEXXtuspm.temple.edu)
Date: 05/26/04

  • Next message: workpef: "vfpoledb.1 and updating using ADO & VB6" 
    Date: Wed, 26 May 2004 11:10:58 -0400

    Lee,

    Thanks for your quick follow-up.

    1. I note that the Picture control in VB allows me to assign the image
    directly from the ImageFile object without the intervening temporary
    graphics file. In addition, I can transfer the thumbnail image from the JPEG
    file into an intervening vector object, and then fill the Picture control
    from the Picture property of the vector. Very neat. I wish I could do this
    in VFP.

    2. I have some other questions about WIAA, but I can't find a Microsoft
    Newsgroup in which to address them. Can you give me a suggestion on how to
    get help with that. My particular question has to do with the thumbnail
    picture that may or may not be embedded in the JPEG file. I went through the
    JPEG spec. As far as I can tell, there is no standard tag for the thumbnail
    picture. So, if I use WIAA to open a JPEG from an unknown source, there
    appears to be no systematic way for me to determine if a thumbnail picture
    is in there. Do you know how I can get this clarified for me?

    Thanks,
    Jim

    "Lee Mitchell" <Leemi@online.microsoft.com> wrote in message
    news:E2lMrFoQEHA.2968@cpmsftngxa10.phx.gbl...
    > Hi Jim:
    >
    > The technique of copying the image to a file and then displaying it may be
    > inefficient, but it is about the most foolproof method of performing this
    > task. Many programmers copy the image to a file to prevent having to
    store
    > the image in a VPF general field.
    >
    > I cannot recommend any other controls to display the images. If you find
    a
    > third-party control, make sure it has been tested in VFP. Microsoft only
    > supports our ActiveX controls that we have tested in VFP. Often, an
    ActiveX
    > control works find in VB but fails in VFP.
    >
    > I hope this helps.
    >
    > This posting is provided "AS IS" with no warranties, and confers no
    rights.
    >
    > Sincerely,
    > Microsoft FoxPro Technical Support
    > Lee Mitchell
    >
    > *-- VFP8 HAS ARRIVED!! --*
    > Read about all the new features of VFP8 here:
    > http://www.universalthread.com/VisualFoxPro/News/VFP8Release.asp
    > Purchase VFP8 here:
    > http://shop.microsoft.com/Referral/Productinfo.asp?siteID=11518
    >
    > Keep an eye on the product lifecycle for Visual FoxPro here:
    > http://support.microsoft.com/default.aspx?id=fh;[ln];lifeprodv
    > - VFP5 Mainstream Support retired June 30th, 2003
    > - VFP6 Mainstream Support retires Sept. 30th, 2003
    >
    > >I'm working on a VFP application that will display the thumbnail pictures
    > >contained in JPG files from a digital camera. I've been implementing this
    > in
    > >VFP with the Microsoft Image Acquisition Automation software. I am able
    to
    > >access all of the items in the JPG file, including the thumbnail picture.
    > >But, I am at a loss for the best way to display this in a VFP control.
    >
    > >The VFP image control picture property requires a character string
    > >containing the path to an image file of some sort. It seems pretty
    > >inefficient for me to copy the thumbnail picture out of the JPG file,
    write
    > >it to a BMP file on the disk, and then read it back into the Image
    control.
    >
    > >Does anyone know of a better way to get the thumbnail picture from a JPG
    > >file into the Image control, or of another picture control better adapted
    > >for this purpose.
    >
    > >Thanks for your help.
    >
    > >Jim
    >
    >

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