Get string from dll

Hi,

Ive written some functions in c++ wich i can call from a .dll in Blitz.
How do i return a string from the c++ function to a blitz variable.

C++ code:

#include <iostream>
#include <fstream>
#include <windows.h>

using namespace std;

char acUserName[100];
DWORD nUserName = sizeof(acUserName);

__declspec( dllexport ) string getuser();
__declspec( dllexport ) int writeuser();
__declspec( dllexport ) int main();

int main()
{
	getuser();
	writeuser();
}

string getuser()
{
	GetUserNameA(acUserName, &nUserName);
	return acUserName;
	//return 0;
}

int writeuser()
{
	ofstream myfile;
	myfile.open ("user.txt");
	myfile << acUserName;
	myfile.close();
	return 0;
}

Blitz code:

result = CallDLL("GetUser","getuser")

Print "Result= " + result
WaitKey()

End