vb6调用C API-MySQL Embedded

Question

I am trying to connect to MySQL 5.5.48 with Embedded Server through VB6 calling conventions but doesn't know How to do it?

The MySQL document say's calling of before calling to MySql_Init

int mysql_server_init(int argc, char **argv, char **groups)

The Online example give the following Code in C:

static char *server_args[] = {
  "this_program",       /* this string is not used */
  "--datadir=.",
  "--key_buffer_size=32M"
};

static char *server_groups[] = {
  "embedded",
  "server",
  "this_program_SERVER",
   (char *)NULL
};

if (mysql_server_init(sizeof(server_args) / sizeof(char *),
                    server_args, server_groups)) {
//Error Message
}

I have tried to declare function as:

Public Declare Sub mysql_server_init Lib "libmySQLd" (ByVal _
    lMYSQL As Long, ByVal abc As Long, ByVal def As Long)

or

Public Declare Sub mysql_server_init Lib "libmySQLd" (ByVal _
    lMYSQL As Long, ByVal abc As String, ByVal def As String)

and calling

 call mysql_server_init(0, NULL, NULL)

or

 call mysql_server_init(0, chr(0), chr(0))

but the program is craching. Kindly Help me with proper calling convention between vb6 and C

Answer 1

Reliably calling C DLLs from VB6 is a non-trivial process. Check out this project , which provides VB6 the ability to call pretty much any function from any standard DLL or COM object.