C语言怎么读写配置文件

/************************************************************************/
/*       make0000@msn.com   */
/************************************************************************/
/************************************************************************/
#include "stdio.h"    
#include "conio.h" 
#include "signal.h"    
#include "setjmp.h" 
#include "assert.h" 
#ifdef __cplusplus 
  #include "iostream"        
  #include "exception" 
  extern "C"{ 
    #define dllexport __declspec(dllexport)       
    jmp_buf Jmp_Buf; 
    int E; 
    #define Exception 0x00000 
    #define e Exception 
    #define try if(!(E=setjmp(Jmp_Buf))) 
    #define last_error() E 
    #define catch(val) else 
    #define throw(val) longjmp(Jmp_Buf,val)   
    #define check(expersion) assert(expersion) 
    #define GetError() errno    
    dllexport void sig_usr(int); 
    dllexport char* getTime();  
  }
#else 
  #define dllexport __declspec(dllexport)       
  jmp_buf Jmp_Buf; 
  int E; 
  #define Exception 0x00000 
  #define e Exception 
  #define try if(!(E=setjmp(Jmp_Buf))) 
  #define last_error() E 
  #define catch(val) else 
  #define throw(val) longjmp(Jmp_Buf,val)
  #define check(expersion) assert(expersion) 
  #define GetError() errno
  dllexport void sig_usr(int); 
  dllexport char* getTime();
#endif

#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 
#include <windows.h> 
#define SIZE 128 
#include "CException.h" 
#define export __declspec(dllexport) 
//读取配置文件. 
int read_file(char* filename,char* key,char* value); 
//写配置文件. 
int write_file(char* filename,char* key,char* value); 
//释放文件. 
int release(); 
//写入节. 
int write_section(char* filename,char* section); 
int read_section(char* filename); 
int getAuthor(char* value); 
void getVersion(char* value);

#include "File.h" 
#include <string.h> 
int read_file(char* filename,char* key,char* value) 
{ 
 int flag=0; 
 char buffer[SIZE]; 
 FILE *file=fopen(filename,"r"); 
 try
 { 
  if(file==NULL) 
  { 
  flag=1; 
  throw(flag); 
  } 
  else
  { 
  while(fgets(buffer,SIZE,file)!=NULL) 
  { 
   int i=0,j=0,len=strlen(key); 
   while(buffer[i]!='\0') 
   { 
    if(buffer[i]=='$'&&buffer[i+len+1]=='=') 
    { 
    j=i+len+2; 
     while(buffer[j]!='\0'&&buffer[j]!=';') 
     { 
     int h=0; 
     if(buffer[i+1]==key[i]) 
     { 
      //printf("%c",buffer[j]); 
      value[j-i-len-2]=buffer[j]; 
     } 
     j++; 
     } 
    break; 
    } 
    else if(buffer[i]=='/'&&buffer[i+1]=='/'||buffer[i]==';') 
    { 
    break; 
    //comment 
    } 
   i++; 
   } 
  } 
  } 
 } 
 catch(Exception) 
 { 
  flag=2; 
  fclose(file); 
  printf("can't open file %s",filename); 
  exit(1); 
 } 
 fflush(file); 
 fclose(file); 
 return flag; 
} 
int write_file(char* filename,char* key,char* value) 
{ 
 int flag=0; 
 FILE* file; 
 file=fopen(filename,"a"); 
 try
 { 
 if(file==NULL) 
 { 
 flag=1; 
 throw(flag); 
 } 
 fprintf(file,"$%s=%s\n",key,value); 
 } 
 catch(Exception) 
 { 
 printf("Can't write file %s",filename); 
 exit(1); 
 } 
 fflush(file); 
 fclose(file); 
 return flag; 
} 
int write_section(char* filename,char* section) 
{ 
 int flag=0; 
 FILE* file=NULL; 
 try
 { 
 file=fopen(filename,"a"); 
 if(file!=NULL) 
 { 
  fprintf(file,"[%s]\n",section); 
 } 
 else
 { 
  int flag=1; 
  throw(flag); 
 } 
 } 
 catch(Exception) 
 { 
 printf("can't open file %s",filename); 
 exit(0); 
 } 
 fflush(file); 
 fclose(file); 
 return flag; 
} 
int release() 
{ 
 int flag=1; 
 return flag; 
} 
int read_section(char* filename) 
{ 
 return 0; 
} 
int getAuthor(char* value) 
{ 
 char author[128]="武汉软件工程职业学院计算机应用系"; 
 int i=0; 
 for(i=0;i<strlen(author);i++) 
 { 
 value[i]=author[i]; 
 } 
 return 0; 
} 
void getVersion(char* value) 
{ 
 char version[128]="2009//05//01"; 
 int i=0; 
 for(i=0;i<strlen(version);i++) 
 { 
 value[i]=version[i]; 
 } 
} 
/************************************************************************** 
void main() 
{ 
 char* str=NULL; 
 char author[120]; 
 char buffer[128]; 
 char buffer1[128]; 
 char buffer2[128]; 
 read_file("F:\\exercise\\C++!C\\sys.ini","password",buffer); 
 read_file("F:\\exercise\\C++!C\\sys.ini","username",buffer1); 
 read_file("F:\\exercise\\C++!C\\sys.ini","driver",buffer2); 
 printf("password=%s\n",buffer); 
 printf("\n"); 
 printf("username=%s\n",buffer1); 
 printf("\n"); 
 printf("driver=%s\n",buffer2); 
 getAuthor(author); 
 printf("\n"); 
 printf("author=%s",author); 
 release(); 
}