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2008.08.28 07:39 "Array of doubles to private tag", by <jtanis@gmail.com>

2008.08.28 08:05 "Re: Array of doubles to private tag", by Andrey Kiselev

2008.08.28 08:54 "Re: Array of doubles to private tag", by <jtanis@gmail.com>

2008.08.28 07:39 "Array of doubles to private tag", by <jtanis@gmail.com>

Hi,

I'm dealing with (for me) a strange problem. I'm trying to write a number of
double's to a private tag. Shouldn't be a problem I thought, but it seems it
is.

For this I wrote the following test code for an array of shorts and doubles.
The array with shorts works great! With the double's, I see that the tag is
made within the TIFF file, but there arent't any values...
I check each ' TIFFSetField'  and all results are 1, meaning succes...

Result: http://i38.tinypic.com/143qgat.png


[CODE]
-------------------------------------------

#include <tiffio.h>
#include <stdio.h>


#define TIFFTAG_R00 40001
#define TIFFTAG_R01 40002


static void TagExtender(TIFF *tiff)
{
    static const TIFFFieldInfo xtiffFieldInfo[] = {
                { TIFFTAG_R00, 4, 4, TIFF_DOUBLE, FIELD_CUSTOM, 0, 1, "R00"
},
                { TIFFTAG_R01, 4, 4, TIFF_SHORT,  FIELD_CUSTOM, 0, 1, "R01"
},

        };

    TIFFMergeFieldInfo( tiff, xtiffFieldInfo,
                sizeof(xtiffFieldInfo) / sizeof(xtiffFieldInfo[0]) );
}

int main()
{
    TIFF    *tiff;

    TIFFSetTagExtender(TagExtender);

    tiff = TIFFOpen("foo.tiff", "w");

        short        shortD[4]     = {1,2,3,4};
        double  doubleD[4] = {0.2,1.2,2.2,3.2};

        TIFFSetDirectory(tiff, 0);

        bool result = true;

        // Setting fields
        result &= (TIFFSetField(tiff, TIFFTAG_IMAGEWIDTH,   100) ==
1);
        result &= (TIFFSetField(tiff, TIFFTAG_IMAGELENGTH,  100) == 1 );
        result &= (TIFFSetField(tiff, TIFFTAG_BITSPERSAMPLE,  8) == 1);
        result &= (TIFFSetField(tiff, TIFFTAG_SAMPLESPERPIXEL,3) == 1);


        // Writing Private tags
        result &= (TIFFSetField(tiff, TIFFTAG_R00, 4, &doubleD)  == 1);
        result &= (TIFFSetField(tiff, TIFFTAG_R01, 4, &shortD) == 1);

        TIFFWriteDirectory(tiff);
        TIFFClose(tiff);



    return 0;
}