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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