IG_ISIS_choice_get

Get a flag word for a tag.

Declaration:

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AT_ERRCOUNT ACCUAPI IG_ISIS_choice_get_flags( HISISDRV hDriver, AT_MODE nTag, LPAT_LMODE lpFlags );

Arguments:

hDriver	The handle to the driver.
nTag	The tag for which the flag word is being requested.
lpFlags	A pointer to a buffer that will contain the result of IG_ISIS_choice_get_flags. Currently, only two bits of lpFlags are defined: IG_ISIS_CONT_RANGE - Choice values are represented internally as a range, with a low value, a high value, and a step value. IG_ISIS_CONT_LIST - Choice values are represented internally as a simple list of values.

Return Value:

Error count.

Supported Raster Image Formats:

This function does not process image pixels.

Example:

The following example shows how to use IG_ISIS_choice_get_flags to determine whether a particular tag is a list or a range. This is part of a sample that determines whether a scanner can output binary, grayscale, or color.

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main() { LONG lBits, lSamps, lFlags; WORD wCount, iIndex; HISISDRV hScan; AT_ERRCOUNT nErrCount; /* Load & init a scanner driver. / nErrCount = IG_ISIS_drv_load_init_pipe(0, "NIKON", &hScan, 0); / Find out how many choices for SAMPLESPERPIXEL. /IG_ISIS_choice_get_count(hScan, IG_ISIS_TAG_SAMPLESPERPIXEL, &wCount); / Get and set values for SAMPLESPERPIXEL one at a time. / for (iIndex = 0; iIndex < wCount; iIndex++) {IG_ISIS_choice_get_long(hScan, IG_ISIS_TAG_SAMPLESPERPIXEL, iIndex, &lSamps);IG_ISIS_tag_set_long(hScan, IG_ISIS_TAG_SAMPLESPERPIXEL, 0, lSamps); / If SAMPLESPERPIXEL is 1, then must be binary or grayscale. / if (lSamps == 1) { LONG lValue; / Determine whether BITSPERSAMPLE is list or range. /IG_ISIS_choice_get_flags(hScan, IG_ISIS_TAG_BITSPERSAMPLE, &lFlags); / Handle case where BITSPERSAMPLE is a list. / if (lFlags & IG_ISIS_CONT_LIST) { WORD iIndex, wCount; LONG lBits;IG_ISIS_choice_get_count(hScan, IG_ISIS_TAG_BITSPERSAMPLE, &wCount); for (iIndex = 0; iIndex < wCount; iIndex++) {IG_ISIS_choice_get_long(hScan, IG_ISIS_TAG_BITSPERSAMPLE, iIndex, &lBits); if (lBits==1) printf("Binary is supported\n"); else printf("%d-bit grayscale is supported\n", INT16)lBits); } } else / Handle other cases. */ . . .

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main()
{
        LONG lBits, lSamps, lFlags;
        WORD wCount, iIndex;
        HISISDRV hScan;
        AT_ERRCOUNT nErrCount;
/* Load & init a scanner driver.                                                    */
        nErrCount = IG_ISIS_drv_load_init_pipe(0, "NIKON", &hScan, 0);
/* Find out how many choices for SAMPLESPERPIXEL.                                                       */IG_ISIS_choice_get_count(hScan, IG_ISIS_TAG_SAMPLESPERPIXEL, &wCount);
/* Get and set values for SAMPLESPERPIXEL one at a time.                                                        */
        for (iIndex = 0; iIndex < wCount; iIndex++) {IG_ISIS_choice_get_long(hScan, IG_ISIS_TAG_SAMPLESPERPIXEL, iIndex,
                                        &lSamps);IG_ISIS_tag_set_long(hScan, IG_ISIS_TAG_SAMPLESPERPIXEL, 0, lSamps);
/* If SAMPLESPERPIXEL is 1, then must be binary or grayscale.                                                   */
                if (lSamps == 1) {
                        LONG lValue;
/* Determine whether BITSPERSAMPLE is list or range.                                                    */IG_ISIS_choice_get_flags(hScan, IG_ISIS_TAG_BITSPERSAMPLE, &lFlags);
/* Handle case where BITSPERSAMPLE is a list.                                                   */
                        if (lFlags & IG_ISIS_CONT_LIST) {
                                WORD iIndex, wCount;
                                LONG lBits;IG_ISIS_choice_get_count(hScan, IG_ISIS_TAG_BITSPERSAMPLE, &wCount);
                                for (iIndex = 0; iIndex < wCount; iIndex++) {IG_ISIS_choice_get_long(hScan, IG_ISIS_TAG_BITSPERSAMPLE,
                                                iIndex, &lBits);
                                        if (lBits==1)
                                                printf("Binary is supported\n");
                                        else
                                                printf("%d-bit grayscale is supported\n",
                                                     INT16)lBits);
                                }
                        }
                        else
/* Handle other cases.                                                                                                  */
                        .
                        .
                        .

Remarks:

The IG_ISIS_choice_get_flags function fills in lpdwFlags with the flag word from tag nTag. The values contained in this flag word are described below, under "Structures."

The flag word returned by IG_ISIS_choice_get_flagsis currently used only to differentiate between two types of flag values in a tag: IG_ISIS_CONT_RANGE and IG_ISIS_CONT_LIST. One of these constants should be ANDed with the flag word output by IG_ISIS_choice_get_flags to determine a choice's internal representation.

While most choice functions behave identically regardless of type, the STEP value is only available if the IG_ISIS_CONT_RANGE bit is set.