问一个函数的用法。getExtendedTcpTable;
先定义，从msdn转过来的。不知道是否有错。请看
- Delphi(Pascal) code
const ANY_SIZE = 256; //---------------------------------------- MIB_TCP_STATE_CLOSED = 1; MIB_TCP_STATE_LISTEN = 2; MIB_TCP_STATE_SYN_SENT = 3; MIB_TCP_STATE_SYN_RCVD = 4; MIB_TCP_STATE_ESTAB = 5; MIB_TCP_STATE_FIN_WAIT1 = 6; MIB_TCP_STATE_FIN_WAIT2 = 7; MIB_TCP_STATE_CLOSE_WAIT = 8; MIB_TCP_STATE_CLOSING = 9; MIB_TCP_STATE_LAST_ACK = 10; MIB_TCP_STATE_TIME_WAIT = 11; MIB_TCP_STATE_DELETE_TCB = 12;//------------------------------------------ TTCPTableClass = (TCP_TABLE_BASIC_LISTENER, TCP_TABLE_BASIC_CONNECTIONS , TCP_TABLE_BASIC_ALL, TCP_TABLE_OWNER_PID_LISTENER , TCP_TABLE_OWNER_PID_CONNECTIONS , TCP_TABLE_OWNER_PID_ALL , TCP_TABLE_OWNER_MODULE_LISTENER, TCP_TABLE_OWNER_MODULE_CONNECTIONS , TCP_TABLE_OWNER_MODULE_ALL ); TUDPTableClass = (UDP_TABLE_BASIC , UDP_TABLE_OWNER_PID , UDP_TABLE_OWNER_MODULE ); MIB_TCPROW_OWNER_PID = record dwState :DWORD; dwLocalAddr :DWORD; dwLocalPort :DWORD; dwRemoteAddr :DWORD; dwRemotePort :DWORD; dwOwningPid :DWORD; end; PMIB_TCP_ROW = ^MIB_TCPROW_OWNER_PID; MIB_TCPTABLE_OWNER_PID = record dwNumEntries :DWORD; table :array[0..ANY_SIZE-1] of MIB_TCPROW_OWNER_PID; end; PMIB_TCPTABLE_OWNER_PID = ^MIB_TCPTABLE_OWNER_PID; //----------------------------------------
然后再是导出的2个函数，
- Delphi(Pascal) code
{DWORD GetExtendedTcpTable( PVOID pTcpTable, PDWORD pdwSize, BOOL bOrder, ULONG ulAf, TCP_TABLE_CLASS TableClass, ULONG Reserved); }function GetExtendedTcpTable(pTcpTable:PMIB_TCPTABLE_OWNER_PID; pdwSize:pDWORD; bOrder:Boolean; ulAf:Cardinal; TableClass:TTCPTableClass; Reserved:Cardinal):DWORD ; stdcall; external 'iphlpapi.dll' name 'GetExtendedTcpTable';{DWORD GetExtendedUdpTable( PVOID pUdpTable, PDWORD pdwSize, BOOL bOrder, ULONG ulAf, UDP_TABLE_CLASS TableClass, ULONG Reserved);}function GetExtendedUdpTable(pTcpTable:Pointer; pdwSize:pDWORD; bOrder:Boolean; ulAf:Cardinal; TableClass:TUDPTableClass; Reserved:Cardinal):DWORD ; stdcall; external 'iphlpapi.dll' name 'GetExtendedUdpTable';好的。然后是使用，编译没有问题，但是结果就是不乐观。
- Delphi(Pascal) code
procedure TBaseSniffer.displayConnections(PID: DWORD);var pBuf:PChar; tcpRow:MIB_TCPROW_OWNER_PID; adwSize,dResult:DWORD; tmp:string; I,num: Integer;begin try FConnections.Clear;//清楚列表 adwSize:=0; //先定义大小为0,来获取真的大小. dResult:=GetExtendedTcpTable(nil,@adwSize, True,0,TCP_TABLE_OWNER_PID_CONNECTIONS,0);//跟踪到这里发现dResult不是0 也就是函数调用错误了 if adwSize<>0 then begin //分配空间,来获取真的tcp连接表. GetMem(pBuf,adwSize); dResult:=GetExtendedTcpTable(PMIB_TCPTABLE_OWNER_PID(pBuf),@adwSize,True,AF_INET,TCP_TABLE_OWNER_PID_ALL,0); if dResult<>NO_ERROR then begin FErrorInfo:='获取TCP列表出错'; doError; end else begin num:=PMIB_TCPTABLE_OWNER_PID(pBuf)^.dwNumEntries; if num>0 then begin Inc(pBuf,SizeOf(DWORD)); for I := 1 to num - 1 do begin tcpRow:=PMIB_TCP_ROw(pBuf)^; with tcpRow do if (dwOwningPid=PID)and(dwState in [2,5])and(dwRemoteAddr<>0) then begin tmp:=''; tmp:=Format('远程主机:%S,远程端口:%D,本地端口:%D', [IpAddr2Str(dwRemoteAddr),dwRemotePort,dwLocalPort]); FConnections.Append(tmp); end; Inc(pBuf,SizeOf(MIB_TCPROW_OWNER_PID)); end; end; end; Dec(pBuf,SizeOf(dword)+ num* SizeOf(MIB_TCPROW_OWNER_PID)); FreeMem(pBuf); end; finally end;end;
郁闷了 请问各位这个函数究竟怎么用。谢谢
getTCPtable的例子我看了一下的。
[解决办法]
函数调用出错应该立即调用GetLastError取得具体的错误。
GetExtendedTcpTable第一个参数传的是Nil，第二个参数最好传入-1，而不是0，此时会返回一个错误，但是无关紧要.