Tag classes
| qpx_TIFFTagPrefix | 0x74690000 | The high word of the tag ID contains the 'ti' characters. To test for a TIFF tag, use the boolean expression: ((tagID & 0xFFFF0000) = qpx_TIFFTagPrefix) |
| qpx_ExifTagPrefix | 0x65780000 | The high word of the tag ID contains the 'ex' characters. To test for an Exif tag, use the boolean expression: ((tagID & 0xFFFF0000) = qpx_ExifTagPrefix) |
| qpx_GPSTagPrefix | 0x67700000 | The high word of the tag ID contains the 'gp' characters. To test for a GPS tag, use the boolean expression: ((tagID & 0xFFFF0000) = qpx_GPSTagPrefix) |
| qpx_IPTCTagPrefix | 0x49500000 | The high word of the tag ID contains the 'IP' characters. To test for an IPTC tag, use the boolean expression: ((tagID & 0xFFFF0000) = qpx_IPTCTagPrefix) |
| qpx_QTTagPrefix | 0xA9000000 | The high byte of the tag ID contains the '©' character. To test for a QuickTime tag, use the boolean expression: ((tagID & 0xFF000000) = qpx_QTTagPrefix) |