Hello, Teg,
On Fri, Feb 26, 2016 at 11:41 AM, Teg <Teg at djii.com> wrote:
> Hello Igor,
>
> I use Sqlite through a DLL interface. I mean I have another DLL that
> includes Sqlite static linked inside it. All opening, closing and
> access to Sqlite takes place inside the context of the DLL. The
> application never makes Sqlite calls directly. Instead it uses higher
> level functions inside the DLL which talk to the Database through
> Sqlite.
My structure is just like yours:
DLL1
class __declspec(dllexport) Database
{
public:
Database();
virtual ~Database();
virtual int Connect(const char *dbName);
};
DLL2:
class __declspec(dllexport) SQLiteDatabase : public Database
{
public:
SQLiteDatabase();
virtual ~SQLiteDatabase();
virtual int Connect(const char *dbName);
private:
sqlite3 *m_db;
};
DLL3:
extern "C" __declspec(dllexport) Database *ConnectToDB(Database *db)
{
db = new SQLiteDatabase;
return db;
}
main application:
class A
{
public:
A(Database *db)
{
m_db = NULL;
HINSTANCE hInst = LoadLibrary( TEXT( "dialogs.dll" ) );
MYFUNC func = (MYFUNC) GetProcAddress( hInst, "DatabaseProfile" );
m_db = func( db );
}
~A()
{
}
Database *GetDatabase()
{
return m_db;
}
private: Database *m_db;
};
int _tmain(int argc, _TCHAR* argv[])
{
Database *db = NULL, *m_db;
A *a = new A( db );
m_db = a->GetDatabase();
delete m_db;
delete a;
return 0;
}
Full code is in here:
http://stackoverflow.com/questions/35345258/crash-when-disconnecting-from-sqlite-database
Is CL suggestion makes sense?
Thank you.
> I've not attempted to do what you're doing exactly. I don't like
> sharing memory across the DLL boundary because I mostly use static
> linkage. It causes issues. I'll use allocated memory as handles to a
> class inside the DLL but to the caller it's just a black box. The
> caller doesn't know what the handle contains (like a file handle).
>
>
> Thursday, February 25, 2016, 10:31:49 AM, you wrote:
>
> IK> Hi,
> IK> I'm trying to design/make a program where I will use SQLite from the DLL.
>
> IK> What I mean is I will establish a connection inside a DLL but disconnect
> from
> IK> the database in my main application.
>
> IK> It turns out that doing so I am getting the crash when I try to
> disconnect from
> IK> the database file.
>
> IK> Connecting to the DB and issuing the query works OK and the data is
> retrieved.
>
> IK> I put up some small demo if you need a code to look at.
>
> IK> Thank you.
> IK> _______________________________________________
> IK> sqlite-users mailing list
> IK> sqlite-users at mailinglists.sqlite.org
> IK> http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
>
>
>
> --
> Teg mailto:Teg at djii.com
>
