mysql - mysql_options() crashing in mysqlclient.lib -

i trying use mysql_plugin_dir mysql_options(). , on doing application crashes.

here simple code crashes--

#include "stdafx.h" #include <mysql.h> #include <stdio.h> #include<conio.h> #include <stdlib.h> #include <windows.h> #include<process.h>  mysql *conn;        // connection mysql_res *res; // results mysql_row row; struct connection_details {     char *server;     char *user;     char *password;     char *database; };  mysql* mysql_connection_setup(struct connection_details mysql_details) {     // first of create mysql instance , initialize variables within     mysql *connection = mysql_init(null);      // connect database details attached.     if (!mysql_real_connect(connection,mysql_details.server, mysql_details.user, mysql_details.password, null, 0, null, 0)) {         printf("conection error : %s\n", mysql_error(connection));         exit(1);     }     return connection; }  mysql_res* mysql_perform_query(mysql *connection, char *sql_query) {     // send query database     if (mysql_query(connection, sql_query))     {         printf("mysql query error : %s\n", mysql_error(connection));         // exit(1);     }      return mysql_use_result(connection); } void mythread(void) {       mysql_thread_init();     // assign results return mysql_res pointer     res = mysql_perform_query(conn,"select 2");     while ((row = mysql_fetch_row(res)) !=null)         printf("%s\n", row[0]);      /* clean database result set */     mysql_free_result(res);     /* clean database link */   } void mythreadconnect(void) {      struct connection_details mysqld;     mysqld.server = "localhost";  // mysql database     mysqld.user = "root";       // root user of mysql        mysqld.password = "root"; // password of root user in mysql     mysqld.database = "myfirst";    // databse pick      //connect mysql     conn = mysql_connection_setup(mysqld);      }  int main() {     char path[500]="c:\\users\\abhishek\\documents\\visual studio 2010\\projects\\sampleapplication\\debug\\";     mysql_library_init(0, null, null);     mysql_init(conn);     mysql_options(conn,mysql_plugin_dir ,path);     mythreadconnect();     mythread ();     mysql_library_end();     printf("other business in main\n");      printf("main exiting\n");     getch();     return 0; } 

it crashes @ mysql_options(conn,mysql_plugin_dir ,path);. have searched lot can't find solution. please wrong in code. in advance.

your mistake mysql_init. use conn = mysql_init( null );. in case have not allocated memory conn , try initialize. read docs mysql_init param , return value.