sqlite visual studio 2015

Question

I'm trying to make a program using sqlite and visual studio. I've added sqlite3.def, sqlite3.c, sqlite3.h, sqlite3.dll files to the project directory. I've also added THREADSAFE and SQLITE_ENABLE_COLUMN_METADATA in the project settings to the preprocessor definitions and sqlite3.def in Linker -> Input -> Module definition file . I'm trying to compile the following program

#include <stdio.h>
#include <stdlib.h>
#include "sqlite3.h"


int main(int argc, char **argv)
{
    sqlite3* db;
    char* zErr;
    int rc;
    char* sql;

    rc = sqlite3_open("test.db", &db);

    if (rc)
    {
        fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
        sqlite3_close(db);
        exit(1);
    }

    sql = "create table episodes( id integer primary key,"
          "                       name text, cid int)";

    rc = sqlite3_exec(db, sql, NULL, NULL, &zErr);

    if (rc != SQLITE_OK)
    {
        if (zErr != NULL)
        {
            fprintf(stderr, "SQL error: %s\n", zErr);
            sqlite3_free(zErr);
        }
    }

    sql = "insert into episodes (name,id) values ('Cinnamon Babka2',1)";
    rc = sqlite3_exec(db, sql, NULL, NULL, &zErr);

    if (rc != SQLITE_OK)
    {
        if (zErr != NULL)
        {
            fprintf(stderr, "SQL error: %s\n", zErr);
            sqlite3_free(zErr);
        }
    }

    sqlite3_close(db);
    return 0;
}

And I get a whole bunch of errors, here are some of them:

LNK2001 unresolved external symbol sqlite3_aggregate_context
LNK2001 unresolved external symbol sqlite3_backup_finish
LNK2001 unresolved external symbol sqlite3_backup_pagecount

My question is how to fix this? Thanks!

Answer 1

There are two projects involved in this - the sqlite3.dll and the code you are writing.

main application

This does not build the sqlite3 code, but does require the header file "sqlite3.h", and access to the library file which defines the functions in sqlite3.dll and the .dll to get them from.

Don't add the .def (that describes what is being exported). Don't add the .c file.

• In the linker settings.
• In General

Add Additional Library Directories, the directory containing sqlite3.lib - In the linker settings. - In Input Add sqlite3.lib to the Additional Dependencies.

Build a DLL with exports (sqlite3.dll)

To build a DLL with exports, you need.

1. A description of the files being exported (sqlite3.def)
2. Files to compile (sqlite3.c)

This creates a .lib file (description of the exports) and a .dll (implementation of the code).

Troubleshooting

The Microsoft : Windows DDK includes an application called depends.exe. This can be used to view a .DLL or .EXE imports and exports. This helps you identify if the DLL was correctly built.

The linker option /VERBOSE:LIB ( MSDN : /Verbose ) shows which files the linker is searching for import definitions.