Created
August 29, 2017 07:37
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JPEG file IPTC meta info read example
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| #include <libiptcdata/iptc-data.h> | |
| #include <libiptcdata/iptc-jpeg.h> | |
| #include <jpeglib.h> | |
| #include <stdio.h> | |
| #include <string.h> | |
| #include <stdlib.h> | |
| void iptc_dataset_foreach_handler(IptcDataSet *dataset, void *datasetName) { | |
| IptcFormat format = iptc_dataset_get_format(dataset); | |
| printf("filter: %s\n\n", (char *) datasetName); | |
| //add filter | |
| // if (strcmp(dataset->info->name, datasetName) != 0) { | |
| // printf("ignore this dataset %s\n", dataset->info->name); | |
| // return; | |
| // } | |
| char *fmtStr = "unknown"; | |
| switch (format) { | |
| case IPTC_FORMAT_BINARY: | |
| fmtStr = "binary"; | |
| break; | |
| case IPTC_FORMAT_BYTE: | |
| fmtStr = "byte"; | |
| break; | |
| case IPTC_FORMAT_SHORT: | |
| fmtStr = "short"; | |
| break; | |
| case IPTC_FORMAT_LONG: | |
| fmtStr = "long"; | |
| break; | |
| case IPTC_FORMAT_STRING: | |
| fmtStr = "string"; | |
| break; | |
| case IPTC_FORMAT_NUMERIC_STRING: | |
| fmtStr = "numeric string"; | |
| break; | |
| case IPTC_FORMAT_DATE: | |
| fmtStr = "date"; | |
| break; | |
| case IPTC_FORMAT_TIME: | |
| fmtStr = "time"; | |
| break; | |
| default: | |
| fmtStr = "unknown"; | |
| break; | |
| } | |
| printf("format: %s\n", fmtStr); | |
| printf("info: %s, %s, %s\n", dataset->info->name, dataset->info->title, dataset->info->description); | |
| printf("data: %s, size: %d, tag: %d, record: %d\n", dataset->data, dataset->size, dataset->tag, dataset->record); | |
| printf("\n"); | |
| iptc_dataset_unref(dataset); | |
| } | |
| int main(int argc, char **argv) { | |
| char *jpegFile = "/Users/jemy/XLab/iptc/iptc-base.jpg"; | |
| IptcData *iptcData = iptc_data_new_from_jpeg(jpegFile); | |
| if (iptcData) { | |
| printf("image has iptc data: %d\n", iptcData->count); | |
| //iptc_data_foreach_dataset(iptcData, iptc_dataset_foreach_handler, "Keywords"); | |
| //add new dataset | |
| IptcDataSet *newDataSet = iptc_dataset_new(); | |
| iptc_dataset_set_tag(newDataSet, IPTC_RECORD_APP_2, IPTC_TAG_CITY); | |
| iptc_dataset_set_data(newDataSet, (unsigned char *) "上海", (unsigned int) strlen("上海"), IPTC_VALIDATE); | |
| int success = iptc_data_add_dataset(iptcData, newDataSet); | |
| printf("add status: %d\n", success); | |
| iptc_data_foreach_dataset(iptcData, iptc_dataset_foreach_handler, "City"); | |
| } else { | |
| printf("image has no iptc data\n"); | |
| } | |
| } |
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