我向通过NX二次开发当中的UFUN的API函数查询FMB中的沉头孔的特征并将特征的TAG回到我定义的CTKTAG当中

您可以使用以下代码来查询FMB中的沉头孔特征，并将其TAG回到您定义的CTKTAG中：

#include <uf_defs.h>
#include <uf_modl.h>

// Define your CTKTAG here
#define CTKTAG "YOUR_CTK_TAG"

// Define the feature type you want to query
#define FEATURE_TYPE UF_point_feat_type

// Define the feature subtype you want to query
#define FEATURE_SUBTYPE UF_point_feat_subtype

// Define the feature name you want to query
#define FEATURE_NAME "沉头孔"

// Define the attribute you want to retrieve
#define ATTRIBUTE UF_attr_title

// Define the attribute value you want to retrieve
#define ATTRIBUTE_VALUE "TAG"

// Define the buffer size for the attribute value
#define BUFFER_SIZE 256

// Main function to query the feature and retrieve its attribute
void query_feature_and_set_tag() {

    tag_t part_tag = NULL_TAG;
    tag_t feature_tag = NULL_TAG;
    char attr_value[BUFFER_SIZE];

    // Get the part tag
    UF_PART_ask_display_part(&part_tag);

    // Query the feature
    UF_MODL_ask_feat_named(part_tag, FEATURE_TYPE, FEATURE_SUBTYPE, FEATURE_NAME, &feature_tag);

    if (feature_tag != NULL_TAG) {

        // Get the attribute value
        UF_ATTR_ask_string_value(feature_tag, ATTRIBUTE, ATTRIBUTE_VALUE, BUFFER_SIZE, attr_value);

        // Set the attribute value to your CTKTAG
        UF_ATTR_set_string_value(part_tag, CTKTAG, attr_value);
    }
}

// Call the main function to query the feature and set the tag
int main(int argc, char *argv[]) {

    query_feature_and_set_tag();
    return 0;
}

请注意，这段代码需要在NX二次开发环境中进行编译和运行。您还需要根据您的实际情况进行一些修改，例如将"YOUR_CTK_TAG"替换为您定义的CTKTAG，将"沉头孔"替换为您要查询的特征名称等等。