VFP6 Writing to an image file in EXIF area

[eric43]

Having spent a few hours going through miscellaneous image files I have collected over the years ( genealogy related) (using the code in a previous posting) I note a number of Properties ( Fields ) which I would like to use to classify my images. I prefer not to use a filename - I use a code for each image.

I would then imagine that I could search amongst my images for particular strings.

Anyone have any interest in getting me started on this?

Thanks again

Eric

 

[Olaf Doschke]

Basically with GdipSetPropertyItem().

Bye, Olaf.

 

[eric43]

Hi Olaf

I have found this code snippet in C on MSDN which I'm sure could be re written in VFP.This allows a Title change which is what I want.

// Set the image title.
PropertyItem* propItem = new PropertyItem;
CHAR newTitleValue[] = "Fake Photograph 2";

propItem->id = PropertyTagImageTitle;
propItem->length = 18;  //  includes null terminator
propItem->type = PropertyTagTypeASCII;
propItem->value = newTitleValue;

image->SetPropertyItem(propItem);

However I dont have the skills. Is it too much to ask for a little more help?

I envisage a command button on the data field in the grid which, when clicked, would test for say three types of Property which one might like to change and then make the change if the types are valid. I can handle all that but not the conversion.

Many thanks

Eric

 

[Olaf Doschke]

Well, maybe next week. In principle all you need to do is take the code to GET the EXIF informations you already have and change it to use SET methods/functions. You may need to create several methods, eg additional to GetMemString you need SetMemString and additional to buf2num you'd need num2buf...

In general the changes are as simple as changing

output = property

to

property = input

Bye, Olaf.

 

[Mike Gagnon]

AFAIK the current version of GDI does not allow changes of image properties, but only allows to save the image under a new name with the properties changed.

Mike Gagnon

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