Re: VB6 compatible Dll created with VC++6 problems using afxsock functions

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You did n't check errors in your code , so maybe that will tell something
Arkady

<matthieu.bocktaels@xxxxxxxxxxx> wrote in message
news:1151049148.299805.234260@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hi

I've got a problem using send() function (defined in afxsock.h) in a
VB6 compatible DLL that I've made.

Let me explain the situation :

I'm coding a Server-Client application.
- The server runs on a XPEmbedded Windows, and is programmed with
VC++6. Sockets declarations and recv() & send() function are defined in
afxsock.h.
- The client runs on a Windows XP Fammily edition and is programmed in
VB6. I had some problems in making the both communicate beacause of the
limited size of paquets that can be send with winsock SendData in VB.
More over I had already written the Client program in VC++6 using
afxsock, that worked very well.

So I had written a VB6 compatible DLL with VC++ that I've included in
my VB code.

The Dll launches well as I can display some MsgBox, but the characters
send to the server aren't received altough the code is hardly the same
to my VC++ client program.

Are there some cautions to use send() in a Dll ?

Here are some pieces of my codes:

/////////////////////////////////////////
///// Client Dll /////////////////////
/////////////////////////////////////////

#define TRANSF_DTF 20


void __stdcall Transfert_DTF(LPSTR string)
{

WSADATA initialisation_win32;
SOCKET socketID;
SOCKADDR_IN Sock_addr;
unsigned char buffer[PAQUETETH];
unsigned char buffer_ack[4];
HANDLE hFile;
char temp[30];
int packetnbr, packetnbr_ack;
int size;

MessageBox(NULL,"Enter the DLL","Message",MB_OK);

hFile = CreateFile( string, // open file
GENERIC_READ, // open for reading
FILE_SHARE_READ, // share for reading
NULL, // no security
OPEN_EXISTING, // existing file only
FILE_ATTRIBUTE_NORMAL, // normal file
NULL); // no attr. template

if (hFile == INVALID_HANDLE_VALUE)
{
MessageBox(NULL, "Error", "Message", MB_OK);
}

size = GetFileSize(hFile,NULL);
sprintf(temp, "size : %d", size);
MessageBox(NULL,temp,"Message",MB_OK);

//
********************************************************
// Winsock Initialization

erreur=WSAStartup(MAKEWORD(2,2),&initialisation_win32);

socketID=socket(AF_INET,SOCK_STREAM,0);

Sock_addr.sin_family=AF_INET;
Sock_addr.sin_addr.s_addr=inet_addr("192.168.0.2");
Sock_addr.sin_port=htons(8686);

connect(socketID,(struct sockaddr*)&Sock_addr,sizeof(Sock_addr));

buffer_ack[3] = TRANSF_DTF;

compt = send(socketID, (char*)buffer_ack, 4, 0);
sprintf(temp, "Send : %d", compt);
MessageBox(NULL,temp,"Message",MB_OK);

compt = recv(socketID,(char*)buffer_ack,4,0);
sprintf(temp, "Recv : %d", compt);
MessageBox(NULL,temp,"Message",MB_OK);

/////////////////////////////////////////////////////////////



//////////////////////////
///// Server///////////
//////////////////////////

// Same initialisations, then : //

transf_sock = accept(socketID,(struct
sockaddr*)&Socket_addr.sin_addr,NULL);
popup(hWnd, "accepted", 40, NOIR); // display function

if(transf_sock == INVALID_SOCKET)
{
sprintf(temp,"error invalid transf_sock n° %d", WSAGetLastError());
popup(hWnd, temp, 10, NOIR);
}

recv(transf_sock,(char*)buffer_ack,4,NULL);
sprintf(temp, "interception : % d\n", (UCHAR)buffer_ack[3]);
popup(hWnd, temp, 70, NOIR);

/////////////////////////////////////////////////////////////


Both programs are blocked as the server don't receive the first 4
bytes...


Someone can help me ?

Thanks.

Matthieu.


.

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