如何使用C API来操作UCI

https://forum.openwrt.org/viewtopic.php?pid=183335#p183335

 

Compiling UCI as stand alone with an example using the C API
1. Compiling UCI as stand alone

cd ~

git clone git://nbd.name/uci.git ~/uci

cd ~/uci

cmake -DBUILD_LUA=off .

make install DESTDIR=$HOME

2. Example code using the UCI C API
~/uci/main.c

#include <stdio.h>

#include <string.h>

#include <uci.h>

#include <stdlib.h>



int main (int argc, char **argv)

{

  struct uci_context *c;

  struct uci_ptr p;

  char *a = strdup ("wireless.@wifi-iface[0].ssid");



  c = uci_alloc_context ();

  if (uci_lookup_ptr (c, &p, a, true) != UCI_OK)

    {

      uci_perror (c, "XXX");

      return 1;

    }



  printf("%s\n", p.o->v.string);

  uci_free_context (c);

  free (a);

  return 0;

}

3. Compile the example

cc -I$HOME/usr/include -L$HOME/usr/lib main.c -luci -o uci-test

4. Run the compiled example binary

export LD_LIBRARY_PATH=$HOME/usr/lib

./uci-test

XXX: Entry not found

heloc

使用过程中发现一个比较奇怪的问题，

static int config_file_read(struct _options *opt)

{

    struct uci_context *ctx;

    struct uci_ptr ptr;

    char a[32];

    int i;



    ctx = uci_alloc_context();



    memset(a, 0, sizeof(a));

    printf("1234....\n");

    strcpy(a, "scws.wsn.netid");

    printf("a(L=%d) = %s\n", strlen(a), a);

执行之后似乎strcpy只能拷贝.之前的几个字符，将uci_alloc_context调到strcpy之后就可以了，再把它调回来又不再出现这样的问题了！很奇怪。

 

这样应用可以：