Hello,


i want to access a self written plain C dll from within FVP with help from
christof lange's struct class

the problem is i had to pass a pointer to a structure containing
serveral other pointers and int values ..

the passing works just fine .. but when i want to read out the data
back with the SetString procedure
the values get not updatet properly ..

here are some snipets of the source code:

dll -> struct definition in header file:

struct hlserver {
int id;
char *host_name;
char *address;
unsigned int ipaddr;
unsigned short port;
char *server_name;
char *map_name;
char *gamedir;
char *game;
int num_players;
int max_players;
int protocol_version;
char *sv_type;
char *sv_os;
};

dll -> function that is called from vfp:

char* HLRequestDetail ( struct hlserver *server)
{

SOCKET HLSock;
struct sockaddr_in HLAddr;
int HLpktlen, HLData;
char *HLok;
long pkt_data[PACKET_LEN/sizeof(long)];
char *pkt= (char*)&pkt_data[0];
server->ipaddr = inet_addr(server->address);

HLSock = socket(AF_INET,SOCK_DGRAM,0);
HLAddr.sin_family = AF_INET;
HLAddr.sin_port = htons(server->port);
HLAddr.sin_addr.s_addr = server->ipaddr;
sendto(HLSock,hl_details,12,0,(struct sockaddr *)
&HLAddr,sizeof(HLAddr));
HLpktlen = sizeof(HLAddr);
HLData = recvfrom(HLSock,pkt,sizeof(pkt_data)
,0,(struct sockaddr *)&HLAddr,&HLpktlen);


/* normaly now i would read out the data out of the recieved packet, but for testing purposes i generated the following lines of code to simulate some return values */

server->server_name= "HeinzTest";
server->map_name= "de_test";
server->num_players= 5;
server->max_players= 12;
server->protocol_version= 47;
return;
....


here the code from vfp:

&& Creat object of my subclass hlserverinfo from class struct
lnServerHandle = CreateObject ("hlserverinfo")

&& Start DLL Winsock ( WSAStartup with version checking , must be at least 1.1 )
lnStartNet = HLStartNet()
if lnStartNet = 1
return
endif

lcBuffer = lnServerHandle.GetString( ) && Initiate Structure from Object Strings

lnecho = HLRequestDetail( @lcBuffer ) && Call DLL with Structure Reference

lnServerHandle.SetString( m.lcBuffer ) && Read out of Structure to object properties

&& Read values in form
this.parent.txtTest.value = alltrim(lnServerHandle.sAddress)

and so on ...

declared the dll in fvp as followed:

DECLARE STRING HLRequestDetail in hlspydll STRING @

would be really nice if someone could give me tips/suggestions are even better a solution to my problem .. cause without this function my entire programm would be useless

THX beforehand

Christian Ehlscheid