谁能详细告诉我 libxml2 库中的 xmlHashScan 函数? [英] Can anyone tell me in detail about xmlHashScan function in the libxml2 library?

问题描述

谁能详细告诉我 libxml2 库中的 xmlHashScan 函数?

Can anyone tell me in detail about xmlHashScan function in the libxml2 library?

推荐答案

//这里是我拼凑起来的一个例子来为自己澄清:

// here is an example I cobbled together to clarify for myself:

//假设 libxml2 位于/usr/local/include 和/usr/local/lib

// assume libxml2 is in /usr/local/include and /usr/local/lib

gcc -std=gnu99 -g3 -I/usr/local/include/libxml2 -c th.c
gcc -std=gnu99 -g3 -o th th.o -L/usr/local/lib -lxml2
./th

ht{foo} == FOO
ht{bar} == BAR
k/v == [bar,BAR]
k/v == [foo,FOO]

//其中 th.c 如下:

// where th.c is as follows:

#include <libxml/hash.h>

static void perEntry(void *payload, void *data, xmlChar *name) {
    char *fmt_psz = (char *) data;
    char *key_psz = (char *) name;
    char *value_psz = (char *) payload;

    printf(fmt_psz, key_psz, value_psz);
}

void testHash(void) {
    xmlHashTablePtr ht = xmlHashCreate(0);

    xmlHashAddEntry(ht, "foo", "FOO");
    xmlHashAddEntry(ht, "bar", "BAR");

    const xmlChar *f = xmlHashLookup(ht, "foo");
    const xmlChar *b = xmlHashLookup(ht, "bar");
    printf("ht{%s} == %s\n", "foo", f);
    printf("ht{%s} == %s\n", "bar", b);

    xmlHashScanner hsf = perEntry;
    xmlHashScan(ht, hsf, "k/v == [%s,%s]\n");

    xmlHashFree(ht, NULL);
}

int main(int argc, char *argv[]) {
    testHash();
}

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