C 读取ini文件的实例详解

C 读取ini文件

前言：

在Windows下可以用GetPrivateProfileString或GetPrivateProfileInt方便读取.ini配置文件内容，但是在Linux平台上就一筹莫展了。为了解决该问题，打算用C来读取.ini，即可不受平台的限制了。

#define CONF_FILE_PATH "Config.ini"
#include <string.h>
#ifdef WIN32
#include <Windows.h>
#include <stdio.h>
#else
#define MAX_PATH 260
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#endif
char g_szConfigPath[MAX_PATH];
//获取当前程序目录
int GetCurrentPath(char buf[],char *pFileName)
{
#ifdef WIN32
GetModuleFileName(NULL,buf,MAX_PATH);
#else
char pidfile[64];
int bytes;
int fd;
sprintf(pidfile, "/proc/%d/cmdline", getpid());
fd = open(pidfile, O_RDONLY, 0);
bytes = read(fd, buf, 256);
close(fd);
buf[MAX_PATH] = '\0';
#endif
char * p = &buf[strlen(buf)];
do
{
*p = '\0';
p--;
#ifdef WIN32
} while('\\' != *p );
#else
} while('/' != *p );
#endif
p++;
//配置文件目录
memcpy(p,pFileName,strlen(pFileName));
return 0;
}
//从INI文件读取字符串类型数据
char *GetIniKeyString(char *title,char *key,char *filename)
{
FILE *fp;
char szLine[1024];
static char tmpstr[1024];
int rtnval;
int i = 0;
int flag = 0;
char *tmp;
if((fp = fopen(filename,"r")) == NULL)
{
printf("have no such file \n");
return "";
}
while(!feof(fp))
{
rtnval = fgetc(fp);
if(rtnval == EOF)
{
break;
}
else
{
szLine[i++] = rtnval;
}
if(rtnval == '\n')
{
#ifndef WIN32
i--;
#endif
szLine[--i] = '\0';
i = 0;
tmp = strchr(szLine, '=');
if(( tmp != NULL )&&(flag == 1))
{
if(strstr(szLine,key)!=NULL)
{
//注释行
if ('#' == szLine[0])
{
}
else if ( '\/' == szLine[0] && '\/' == szLine[1] )
{
}
else
{
//找打key对应变量
strcpy(tmpstr,tmp+1);
fclose(fp);
return tmpstr;
}
}
}
else
{
strcpy(tmpstr,"[");
strcat(tmpstr,title);
strcat(tmpstr,"]");
if( strncmp(tmpstr,szLine,strlen(tmpstr)) == 0 )
{
//找到title
flag = 1;
}
}
}
}
fclose(fp);
return "";
}
//从INI文件读取整类型数据
int GetIniKeyInt(char *title,char *key,char *filename)
{
return atoi(GetIniKeyString(title,key,filename));
}
int main(int argc,char* argv[])
{
char buf[MAX_PATH];
memset(buf,0,sizeof(buf));
GetCurrentPath(buf,CONF_FILE_PATH);
strcpy(g_szConfigPath,buf);
int iCatAge;
char szCatName[32];
iCatAge = GetIniKeyInt("CAT","age",g_szConfigPath);
strcpy(szCatName,GetIniKeyString("CAT","name",g_szConfigPath));
return 0;
}

#define CONF_FILE_PATH "Config.ini" 

#include <string.h> 

#ifdef WIN32
#include <Windows.h>
#include <stdio.h>
#else 

#define MAX_PATH 260 

#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#endif 

char g_szConfigPath[MAX_PATH]; 

//获取当前程序目录
int GetCurrentPath(char buf[],char *pFileName)
{
#ifdef WIN32
  GetModuleFileName(NULL,buf,MAX_PATH);
#else
  char pidfile[64];
  int bytes;
  int fd; 

  sprintf(pidfile, "/proc/%d/cmdline", getpid()); 

  fd = open(pidfile, O_RDONLY, 0);
  bytes = read(fd, buf, 256);
  close(fd);
  buf[MAX_PATH] = '\0'; 

#endif
  char * p = &buf[strlen(buf)];
  do
  {
    *p = '\0';
    p--;
#ifdef WIN32
  } while( '\\' != *p );
#else
  } while( '/' != *p );
#endif 

  p++; 

  //配置文件目录
  memcpy(p,pFileName,strlen(pFileName));
  return 0;
} 

//从INI文件读取字符串类型数据
char *GetIniKeyString(char *title,char *key,char *filename)
{
  FILE *fp;
  char szLine[1024];
  static char tmpstr[1024];
  int rtnval;
  int i = 0;
  int flag = 0;
  char *tmp; 

  if((fp = fopen(filename, "r")) == NULL)
  {
    printf("have  no  such  file \n");
    return "";
  }
  while(!feof(fp))
  {
    rtnval = fgetc(fp);
    if(rtnval == EOF)
    {
      break;
    }
    else
    {
      szLine[i++] = rtnval;
    }
    if(rtnval == '\n')
    {
#ifndef WIN32
      i--;
#endif
      szLine[--i] = '\0';
      i = 0;
      tmp = strchr(szLine, '=');  

      if(( tmp != NULL )&&(flag == 1))
      {
        if(strstr(szLine,key)!=NULL)
        {
          //注释行
          if ('#' == szLine[0])
          {
          }
          else if ( '\/' == szLine[0] && '\/' == szLine[1] )
          { 

          }
          else
          {
            //找打key对应变量
            strcpy(tmpstr,tmp+1);
            fclose(fp);
            return tmpstr;
          }
        }
      }
      else
      {
        strcpy(tmpstr,"[");
        strcat(tmpstr,title);
        strcat(tmpstr,"]");
        if( strncmp(tmpstr,szLine,strlen(tmpstr)) == 0 )
        {
          //找到title
          flag = 1;
        }
      }
    }
  }
  fclose(fp);
  return "";
} 

//从INI文件读取整类型数据
int GetIniKeyInt(char *title,char *key,char *filename)
{
  return atoi(GetIniKeyString(title,key,filename));
} 

int main(int argc, char* argv[])
{
  char buf[MAX_PATH];
  memset(buf,0,sizeof(buf));
  GetCurrentPath(buf,CONF_FILE_PATH);
  strcpy(g_szConfigPath,buf); 

  int iCatAge;
  char szCatName[32]; 

  iCatAge = GetIniKeyInt("CAT","age",g_szConfigPath);
  strcpy(szCatName,GetIniKeyString("CAT","name",g_szConfigPath)); 

  return 0;
}

下边是配置文件：

[CAT]
age=2
name=Tom

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