C 讀取ini文件的實例詳解

2020-05-23 13:38:58

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C 讀取ini文件

前言：

在Windows下可以用GetPrivateProfileString或GetPrivateProfileInt方便讀取.ini配置文件內容，但是在Linux平臺上就一籌莫展了。為了解決該問題，打算用C來讀取.ini，即可不受平臺的限制了。

#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>#endifchar g_szConfigPath[MAX_PATH];//獲取當前程序目錄int GetCurrentPath(char buf[],char *pFileName){#ifdef WIN32GetModuleFileName(NULL,buf,MAX_PATH);#elsechar 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';#endifchar * p = &buf[strlen(buf)];do{*p = '/0';p--;#ifdef WIN32} while('//' != *p );#else} while('/' != *p );#endifp++;//配置文件目錄memcpy(p,pFileName,strlen(pFileName));return 0;}//從INI文件讀取字符串類型數據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 WIN32i--;#endifszLine[--i] = '/0';i = 0;tmp = strchr(szLine, '=');if(( tmp != NULL )&&(flag == 1)){if(strstr(szLine,key)!=NULL){//注釋行if ('#' == szLine[0]){}else if ( '//' == szLine[0] && '//' == szLine[1] ){}else{//找打key對應變量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titleflag = 1;}}}}fclose(fp);return "";}//從INI文件讀取整類型數據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];  //獲取當前程序目錄 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++;    //配置文件目錄   memcpy(p,pFileName,strlen(pFileName));   return 0; }  //從INI文件讀取字符串類型數據 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)          {            //注釋行           if ('#' == szLine[0])           {           }           else if ( '//' == szLine[0] && '//' == szLine[1] )           {                        }           else           {             //找打key對應變量             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 "";  }  //從INI文件讀取整類型數據 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; }

下邊是配置文件：