Using functions?

This is a discussion on Using functions? within the C++ Programming forums, part of the General Programming Boards category; I know. I wasn't explaining what it was to you....

  1. #16
    Frequently Quite Prolix dwks's Avatar
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    I know. I wasn't explaining what it was to you.
    dwk

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  2. #17
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    Ive managed to debug it a little, and it doesnt seem to be the cause of my own dll, but the dll MY dll is based on:

    http://users.skynet.be/fa321669/VC++ mysqldllerror.JPG

  3. #18
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    Ive been doing some searching in the msdn files and i found that to enable C++ dlls to be used in VB, i need to add __stdcall in front of the function(in VC++). I tried this, but it did not help.

    EDIT: sry, removed the vb code
    Last edited by Diod; 02-16-2006 at 10:16 AM.

  4. #19
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    This is my VB Code:
    Are you aware that this is a C++ forum?

  5. #20
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    Hmm i actually got it to work. I can now connect through a VB6 project

    But i still cant send a query, it still crashes when i try to send a query, but it also crashes within a C++ project, so i think its a problem with my function. Also, it does not seem to return the "returns" in my VB project. And it also shows an error after i close the VB program after i use the connect function.

    This is my code:

    Code:
    #include "stdafx.h"
    #include <winsock.h>
    #include <mysql.h>
    
    BOOL APIENTRY DllMain( HANDLE hModule, 
                           DWORD  ul_reason_for_call, 
                           LPVOID lpReserved
    					 )
    {
        return TRUE;
    }
    
    char* __stdcall mysql_connect(char *server, char *user, char *password, char *database);
    char* __stdcall mysql_sendquery(char *query);
    char** __stdcall mysql_fetch_row();
    char* __stdcall mysql_closeconn();
    
       MYSQL *conn;
       MYSQL_RES *res;
       MYSQL_ROW row;
    
       char* __stdcall mysql_connect(char *server, char *user, char *password, char *database) {
    	conn = mysql_init(NULL);
    		if (!mysql_real_connect(conn, server, user, password, database, 0, NULL, 0)) {
    			return "Error connecting";
    		}
    	return "Connected";
       }
    
       char* __stdcall mysql_sendquery(char *query) {
    	if (mysql_query(conn, query)) {
    		return "Error with query";
    	}
    	return "Query successfull";
       }
    
       char** __stdcall mysql_fetch_row() {
    	char** error;
    	error[1] = "Error fetching row";
    	res = mysql_use_result(conn);
    	while ((row = mysql_fetch_row(res)) != NULL) {
    	return row;
    	}
    	return error;
       }
    
       char* __stdcall mysql_closeconn() {
    	mysql_close(conn);
    	return "Connection closed";
       }

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