Setting Up VCPlusPlus/The CPP File

In your C file, include the following:

# both from the unreal public sources
#include "core.h"
#include "engine.h"

# the include that was generated by ucc
#include "$UNREALDIR\SQLite\Inc\SQLiteClasses.h"

Strangely enough, the macro IMPLEMENT_PACKAGE doesn't do what it's supposed to do. Instead, add the following line next: (replacing HCSQLIB with the name of your package)

extern "C" DLL_EXPORT TCHAR GPackage[];
DLL_EXPORT TCHAR GPackage[] = TEXT("HCSQLIB");

Then, tell unreal which class(es) this file is implementing. Use

IMPLEMENT_CLASS(ASQLITEFile);

Third, tell unreal which functions you're implementing:

Replace PACKAGE with the name of your package, ID with a UNIQUE number for static functions, or -1 for non-static functions. FUNCTION is the name of your function, prefixed with exec.

IMPLEMENT_FUNCTION(PACKAGE, ID, FUNCTION);

Next, since you didn't use IMPLEMENT_PACKAGE (which doesn't work), you'll have to define your own DLL entry point yourself.

BOOL __stdcall DllMain(HINSTANCE hInInstance, DWORD dwCallType, LPVOID lpPretendIDontExist)
{
  if(dwCallType == DLL_PROCESS_ATTACH)
  {
    // initialize your dll
    hInstance = hInInstance;
  }
  else if(dwCallType == DLL_PROCESS_DETACH)
  {
    // do some cleanup
  }
  return TRUE;

Finally, your function:

Note that the parameters are the same for all functions, no matter what parameters are defined in the corresponding .uc file. See the [native coding reference]? for more information about how to obtain parameters. Also note that the variables s1, i1 and i2 are defined by the macros P_GET_STR and P_GET_INT automatically. The guard and unguardexec macros actually create a try..catch block.

This function takes a string and two integers as parameters and returns the product of the two integers.

void
MyPackage::execTest(FFrame& Stack, RESULT_DECL)
{
  guard(MyPackage::execTest);
  P_GET_STR(s1);
  P_GET_INT(i1);
  P_GET_INT(i2);
  P_FINISH;

  (*(DWORD*)Result) = i1 * i2;

  unguardexec;


}

The according unrealscript function would look like this:

native function int Test(string sStringThatIsIgnored, int iFactor1, int iFactor2);