C++ Winsock Resources

[mathgirl32]

I found another good resource for sockets programming! I don't usually find many with good documentation / comments but this one is really good.

Included in Johnnie's Winsock Tutorial is the following:

*Creating a Listening Socket
*Sending and Receiving
*Non-Blocking and Asynchronous Sockets
*Winsock Programmer's FAQ <----You must check this out!!

tangent's site contains a huge archive of frequently asked questions as well as specialized explanations ranging from the proper way to close a TCP socket to the "64 sockets" limitation. Visit for a discussion of many Winsock topics that may be relevant to your current project or to simply pick up some tips and increase your 'sock savvy.

*Example Source Code

.....includes a healthy sampling of examples. View source for a client utilizing the asynchronous socket model, retrieving a file from a web server, implementing the MFC CSocket class, and even a multi-threaded HTTP server application making use of blocking sockets and overlapped I/O to handle multiple connections simultaneously.

[mathgirl32]

I found another good resource for sockets programming! I don't usually find many with good documentation / comments but this one is really good.

Included in Johnnie's Winsock Tutorial is the following:

*Creating a Listening Socket
*Sending and Receiving
*Non-Blocking and Asynchronous Sockets
*Winsock Programmer's FAQ <----You must check this out!!

tangent's site contains a huge archive of frequently asked questions as well as specialized explanations ranging from the proper way to close a TCP socket to the "64 sockets" limitation. Visit for a discussion of many Winsock topics that may be relevant to your current project or to simply pick up some tips and increase your 'sock savvy.

*Example Source Code

.....includes a healthy sampling of examples. View source for a client utilizing the asynchronous socket model, retrieving a file from a web server, implementing the MFC CSocket class, and even a multi-threaded HTTP server application making use of blocking sockets and overlapped I/O to handle multiple connections simultaneously.

[shadow_dancer]

hhmm .. winsock C++.
http://tangentsoft.net/wskfaq/examples/src/snmpmac.cpp


#include <snmp.h>
#include <conio.h>
#include <stdio.h>

typedef BOOL(WINAPI * pSnmpExtensionInit) (
IN DWORD dwTimeZeroReference,
OUT HANDLE * hPollForTrapEvent,
OUT AsnObjectIdentifier * supportedView);

typedef BOOL(WINAPI * pSnmpExtensionTrap) (
OUT AsnObjectIdentifier * enterprise,
OUT AsnInteger * genericTrap,
OUT AsnInteger * specificTrap,
OUT AsnTimeticks * timeStamp,
OUT RFC1157VarBindList * variableBindings);

typedef BOOL(WINAPI * pSnmpExtensionQuery) (
IN BYTE requestType,
IN OUT RFC1157VarBindList * variableBindings,
OUT AsnInteger * errorStatus,
OUT AsnInteger * errorIndex);

typedef BOOL(WINAPI * pSnmpExtensionInitEx) (
OUT AsnObjectIdentifier * supportedView);

void main()
{
WSADATA WinsockData;
if (WSAStartup(MAKEWORD(2, 0), &WinsockData) != 0) {
fprintf(stderr, "This program requires Winsock 2.x!\n");
return;
}

HINSTANCE m_hInst;
pSnmpExtensionInit m_Init;
pSnmpExtensionInitEx m_InitEx;
pSnmpExtensionQuery m_Query;
pSnmpExtensionTrap m_Trap;
HANDLE PollForTrapEvent;
AsnObjectIdentifier SupportedView;
UINT OID_ifEntryType[] = {
1, 3, 6, 1, 2, 1, 2, 2, 1, 3
};
UINT OID_ifEntryNum[] = {
1, 3, 6, 1, 2, 1, 2, 1
};
UINT OID_ipMACEntAddr[] = {
1, 3, 6, 1, 2, 1, 2, 2, 1, 6
}; //, 1 ,6 };
AsnObjectIdentifier MIB_ifMACEntAddr =
{ sizeof(OID_ipMACEntAddr) / sizeof(UINT), OID_ipMACEntAddr };
AsnObjectIdentifier MIB_ifEntryType = {
sizeof(OID_ifEntryType) / sizeof(UINT), OID_ifEntryType
};
AsnObjectIdentifier MIB_ifEntryNum = {
sizeof(OID_ifEntryNum) / sizeof(UINT), OID_ifEntryNum
};
RFC1157VarBindList varBindList;
RFC1157VarBind varBind[2];
AsnInteger errorStatus;
AsnInteger errorIndex;
AsnObjectIdentifier MIB_NULL = {
0, 0
};
int ret;
int dtmp;
int i = 0, j = 0;
BOOL found = FALSE;
char TempEthernet[13];
m_Init = NULL;
m_InitEx = NULL;
m_Query = NULL;
m_Trap = NULL;

/* Load the SNMP dll and get the addresses of the functions
necessary */
m_hInst = LoadLibrary("inetmib1.dll");
if (m_hInst < (HINSTANCE) HINSTANCE_ERROR) {
m_hInst = NULL;
return;
}
m_Init =
(pSnmpExtensionInit) GetProcAddress(m_hInst, "SnmpExtensionInit");
m_InitEx =
(pSnmpExtensionInitEx) GetProcAddress(m_hInst,
"SnmpExtensionInitEx");
m_Query =
(pSnmpExtensionQuery) GetProcAddress(m_hInst,
"SnmpExtensionQuery");
m_Trap =
(pSnmpExtensionTrap) GetProcAddress(m_hInst, "SnmpExtensionTrap");
m_Init(GetTickCount(), &PollForTrapEvent, &SupportedView);

/* Initialize the variable list to be retrieved by m_Query */
varBindList.list = varBind;
varBind[0].name = MIB_NULL;
varBind[1].name = MIB_NULL;

/* Copy in the OID to find the number of entries in the
Inteface table */
varBindList.len = 1; /* Only retrieving one item */
SNMP_oidcpy(&varBind[0].name, &MIB_ifEntryNum);
ret =
m_Query(ASN_RFC1157_GETNEXTREQUEST, &varBindList, &errorStatus,
&errorIndex);
printf("# of adapters in this system : %i\n",
varBind[0].value.asnValue.number); varBindList.len = 2;

/* Copy in the OID of ifType, the type of interface */
SNMP_oidcpy(&varBind[0].name, &MIB_ifEntryType);

/* Copy in the OID of ifPhysAddress, the address */
SNMP_oidcpy(&varBind[1].name, &MIB_ifMACEntAddr);

do {

/* Submit the query. Responses will be loaded into varBindList.
We can expect this call to succeed a # of times corresponding
to the # of adapters reported to be in the system */
ret =
m_Query(ASN_RFC1157_GETNEXTREQUEST, &varBindList, &errorStatus,
&errorIndex); if (!ret) ret = 1;

else
/* Confirm that the proper type has been returned */
ret =
SNMP_oidncmp(&varBind[0].name, &MIB_ifEntryType,
MIB_ifEntryType.idLength); if (!ret) {
j++;
dtmp = varBind[0].value.asnValue.number;
printf("Interface #%i type : %i\n", j, dtmp);

/* Type 6 describes ethernet interfaces */
if (dtmp == 6) {

/* Confirm that we have an address here */
ret =
SNMP_oidncmp(&varBind[1].name, &MIB_ifMACEntAddr,
MIB_ifMACEntAddr.idLength);
if ((!ret)
&& (varBind[1].value.asnValue.address.stream != NULL)) {
if (
(varBind[1].value.asnValue.address.stream[0] ==
0x44)
&& (varBind[1].value.asnValue.address.stream[1] ==
0x45)
&& (varBind[1].value.asnValue.address.stream[2] ==
0x53)
&& (varBind[1].value.asnValue.address.stream[3] ==
0x54)
&& (varBind[1].value.asnValue.address.stream[4] ==
0x00)) {

/* Ignore all dial-up networking adapters */
printf("Interface #%i is a DUN adapter\n", j);
continue;
}
if (
(varBind[1].value.asnValue.address.stream[0] ==
0x00)
&& (varBind[1].value.asnValue.address.stream[1] ==
0x00)
&& (varBind[1].value.asnValue.address.stream[2] ==
0x00)
&& (varBind[1].value.asnValue.address.stream[3] ==
0x00)
&& (varBind[1].value.asnValue.address.stream[4] ==
0x00)
&& (varBind[1].value.asnValue.address.stream[5] ==
0x00)) {

/* Ignore NULL addresses returned by other network
interfaces */
printf("Interface #%i is a NULL address\n", j);
continue;
}
sprintf(TempEthernet, "%02x%02x%02x%02x%02x%02x",
varBind[1].value.asnValue.address.stream[0],
varBind[1].value.asnValue.address.stream[1],
varBind[1].value.asnValue.address.stream[2],
varBind[1].value.asnValue.address.stream[3],
varBind[1].value.asnValue.address.stream[4],
varBind[1].value.asnValue.address.stream[5]);
printf("MAC Address of interface #%i: %s\n", j,
TempEthernet);}
}
}
} while (!ret); /* Stop only on an error. An error will occur
when we go exhaust the list of interfaces to
be examined */
getch();

/* Free the bindings */
SNMP_FreeVarBind(&varBind[0]);
SNMP_FreeVarBind(&varBind[1]);
}


thanks math girl, finally i can find a site which contained with Winsock C++. Thanks mate.

[shadow_dancer]

hhmm .. winsock C++.
http://tangentsoft.net/wskfaq/examples/src/snmpmac.cpp


#include <snmp.h>
#include <conio.h>
#include <stdio.h>

typedef BOOL(WINAPI * pSnmpExtensionInit) (
IN DWORD dwTimeZeroReference,
OUT HANDLE * hPollForTrapEvent,
OUT AsnObjectIdentifier * supportedView);

typedef BOOL(WINAPI * pSnmpExtensionTrap) (
OUT AsnObjectIdentifier * enterprise,
OUT AsnInteger * genericTrap,
OUT AsnInteger * specificTrap,
OUT AsnTimeticks * timeStamp,
OUT RFC1157VarBindList * variableBindings);

typedef BOOL(WINAPI * pSnmpExtensionQuery) (
IN BYTE requestType,
IN OUT RFC1157VarBindList * variableBindings,
OUT AsnInteger * errorStatus,
OUT AsnInteger * errorIndex);

typedef BOOL(WINAPI * pSnmpExtensionInitEx) (
OUT AsnObjectIdentifier * supportedView);

void main()
{
WSADATA WinsockData;
if (WSAStartup(MAKEWORD(2, 0), &WinsockData) != 0) {
fprintf(stderr, "This program requires Winsock 2.x!\n");
return;
}

HINSTANCE m_hInst;
pSnmpExtensionInit m_Init;
pSnmpExtensionInitEx m_InitEx;
pSnmpExtensionQuery m_Query;
pSnmpExtensionTrap m_Trap;
HANDLE PollForTrapEvent;
AsnObjectIdentifier SupportedView;
UINT OID_ifEntryType[] = {
1, 3, 6, 1, 2, 1, 2, 2, 1, 3
};
UINT OID_ifEntryNum[] = {
1, 3, 6, 1, 2, 1, 2, 1
};
UINT OID_ipMACEntAddr[] = {
1, 3, 6, 1, 2, 1, 2, 2, 1, 6
}; //, 1 ,6 };
AsnObjectIdentifier MIB_ifMACEntAddr =
{ sizeof(OID_ipMACEntAddr) / sizeof(UINT), OID_ipMACEntAddr };
AsnObjectIdentifier MIB_ifEntryType = {
sizeof(OID_ifEntryType) / sizeof(UINT), OID_ifEntryType
};
AsnObjectIdentifier MIB_ifEntryNum = {
sizeof(OID_ifEntryNum) / sizeof(UINT), OID_ifEntryNum
};
RFC1157VarBindList varBindList;
RFC1157VarBind varBind[2];
AsnInteger errorStatus;
AsnInteger errorIndex;
AsnObjectIdentifier MIB_NULL = {
0, 0
};
int ret;
int dtmp;
int i = 0, j = 0;
BOOL found = FALSE;
char TempEthernet[13];
m_Init = NULL;
m_InitEx = NULL;
m_Query = NULL;
m_Trap = NULL;

/* Load the SNMP dll and get the addresses of the functions
necessary */
m_hInst = LoadLibrary("inetmib1.dll");
if (m_hInst < (HINSTANCE) HINSTANCE_ERROR) {
m_hInst = NULL;
return;
}
m_Init =
(pSnmpExtensionInit) GetProcAddress(m_hInst, "SnmpExtensionInit");
m_InitEx =
(pSnmpExtensionInitEx) GetProcAddress(m_hInst,
"SnmpExtensionInitEx");
m_Query =
(pSnmpExtensionQuery) GetProcAddress(m_hInst,
"SnmpExtensionQuery");
m_Trap =
(pSnmpExtensionTrap) GetProcAddress(m_hInst, "SnmpExtensionTrap");
m_Init(GetTickCount(), &PollForTrapEvent, &SupportedView);

/* Initialize the variable list to be retrieved by m_Query */
varBindList.list = varBind;
varBind[0].name = MIB_NULL;
varBind[1].name = MIB_NULL;

/* Copy in the OID to find the number of entries in the
Inteface table */
varBindList.len = 1; /* Only retrieving one item */
SNMP_oidcpy(&varBind[0].name, &MIB_ifEntryNum);
ret =
m_Query(ASN_RFC1157_GETNEXTREQUEST, &varBindList, &errorStatus,
&errorIndex);
printf("# of adapters in this system : %i\n",
varBind[0].value.asnValue.number); varBindList.len = 2;

/* Copy in the OID of ifType, the type of interface */
SNMP_oidcpy(&varBind[0].name, &MIB_ifEntryType);

/* Copy in the OID of ifPhysAddress, the address */
SNMP_oidcpy(&varBind[1].name, &MIB_ifMACEntAddr);

do {

/* Submit the query. Responses will be loaded into varBindList.
We can expect this call to succeed a # of times corresponding
to the # of adapters reported to be in the system */
ret =
m_Query(ASN_RFC1157_GETNEXTREQUEST, &varBindList, &errorStatus,
&errorIndex); if (!ret) ret = 1;

else
/* Confirm that the proper type has been returned */
ret =
SNMP_oidncmp(&varBind[0].name, &MIB_ifEntryType,
MIB_ifEntryType.idLength); if (!ret) {
j++;
dtmp = varBind[0].value.asnValue.number;
printf("Interface #%i type : %i\n", j, dtmp);

/* Type 6 describes ethernet interfaces */
if (dtmp == 6) {

/* Confirm that we have an address here */
ret =
SNMP_oidncmp(&varBind[1].name, &MIB_ifMACEntAddr,
MIB_ifMACEntAddr.idLength);
if ((!ret)
&& (varBind[1].value.asnValue.address.stream != NULL)) {
if (
(varBind[1].value.asnValue.address.stream[0] ==
0x44)
&& (varBind[1].value.asnValue.address.stream[1] ==
0x45)
&& (varBind[1].value.asnValue.address.stream[2] ==
0x53)
&& (varBind[1].value.asnValue.address.stream[3] ==
0x54)
&& (varBind[1].value.asnValue.address.stream[4] ==
0x00)) {

/* Ignore all dial-up networking adapters */
printf("Interface #%i is a DUN adapter\n", j);
continue;
}
if (
(varBind[1].value.asnValue.address.stream[0] ==
0x00)
&& (varBind[1].value.asnValue.address.stream[1] ==
0x00)
&& (varBind[1].value.asnValue.address.stream[2] ==
0x00)
&& (varBind[1].value.asnValue.address.stream[3] ==
0x00)
&& (varBind[1].value.asnValue.address.stream[4] ==
0x00)
&& (varBind[1].value.asnValue.address.stream[5] ==
0x00)) {

/* Ignore NULL addresses returned by other network
interfaces */
printf("Interface #%i is a NULL address\n", j);
continue;
}
sprintf(TempEthernet, "%02x%02x%02x%02x%02x%02x",
varBind[1].value.asnValue.address.stream[0],
varBind[1].value.asnValue.address.stream[1],
varBind[1].value.asnValue.address.stream[2],
varBind[1].value.asnValue.address.stream[3],
varBind[1].value.asnValue.address.stream[4],
varBind[1].value.asnValue.address.stream[5]);
printf("MAC Address of interface #%i: %s\n", j,
TempEthernet);}
}
}
} while (!ret); /* Stop only on an error. An error will occur
when we go exhaust the list of interfaces to
be examined */
getch();

/* Free the bindings */
SNMP_FreeVarBind(&varBind[0]);
SNMP_FreeVarBind(&varBind[1]);
}


thanks math girl, finally i can find a site which contained with Winsock C++. Thanks mate.

[journy101]

I found the above code published by Borland, did you realy write that code?

http://bdn.borland.com/article/0,141...0.html#method3

[Edit]The true author needs to get their credit, I wounder who wrote it[/Edit]

[mathgirl32]

EDIT: Shadow removed the "offending" line. I think what he meant just got lost in the translation.....???