c - 使用 glib 从配置文本中读取值

Question

我有以下 Config.cfg

[Power]
Power8=8
Temp=5=1001
Hum=7=1002
Link=8=1003
Vol=9=1004

[Power]
Power10=10
Temp=5=1012
Hum=7=1013
Link=8=1014
Vol=9=1015

并且通过 glib 的使用，我想读取每个 Power 的值。我想要类似'if Power8=8 then return temp, hum, Link, Vol'之类的东西，否则 Power10=10 也一样

我写了这个函数

int read_config()
{

 GKeyFile *keyfile;
 GKeyFileFlags flags;
 GError *error = NULL;
 gsize length;
 gchar *temperatura, *humedad, *link, *voltage;


 // Create a new GKeyFile object and a bitwise list of flags.
 keyfile = g_key_file_new ();
 flags = G_KEY_FILE_KEEP_COMMENTS | G_KEY_FILE_KEEP_TRANSLATIONS;

 // Load the GKeyFile from keyfile.conf or return.
 if (!g_key_file_load_from_file (keyfile, "/home/pi/Desktop/Config.cfg", flags, &error))
 {
   g_error (error->message);
   return -1;
 }
  printf("[Power]\n");
 if(g_key_file_get_integer(keyfile,"Power","Power8",NULL) == 8)
 {
   temperatura=g_key_file_get_string(keyfile,"Power","Temp",NULL);
   humedad=g_key_file_get_string(keyfile,"Power","Hum",NULL);
   link=g_key_file_get_string(keyfile,"Power","Link",NULL);
   voltage=g_key_file_get_string(keyfile,"Power","Volt",NULL);
   printf("Power8:%d\n",g_key_file_get_integer(keyfile,"Power","Power8",NULL));
   printf("Temp:%s\n",temperatura);
   printf("Hum:%s\n",humedad);
   printf("Link:%s\n",link);
   printf("Vol:%s\n",voltage);
 }
else
 {
   temperatura=g_key_file_get_string(keyfile,"Power","Temp",NULL);
   humedad=g_key_file_get_string(keyfile,"Power","Hum",NULL);
   link=g_key_file_get_string(keyfile,"Power","Link",NULL);
   voltage=g_key_file_get_string(keyfile,"Power","Volt",NULL);
   printf("Power10:%d\n",g_key_file_get_integer(keyfile,"Power","Power10",NULL));
   printf("Temp:%s\n",temperatura);
   printf("Hum:%s\n",humedad);
   printf("Link:%s\n",link);
   printf("Vol:%s\n",voltage);
 }

}

但它返回 Power10 和 Vol=(Null) 的值

[Power]
Power8=8
Temp=5=1012
Hum=7=1013
Link=8=1014
Vol=(Null)

这里有什么问题？

Answer 1

The documentation明确指出:

Note that in contrast to the Desktop Entry Specification, groups in key files may contain the same key multiple times; the last entry wins. Key files may also contain multiple groups with the same name; they are merged together.

因此，您的文件不是有效的 glib key 文件，因为它试图多次定义相同的 key ，期望每个组都是一个“对象”。不幸的是，事情并非如此。

Vol 问题似乎只是错误的 key ，您正在调用 "Volt" 但文件具有 Vol。