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procedure SetMtu(IP: String) ;
type
TNetTransportEnum = function(pszServer : PWideChar;
Level : DWORD;
var pbBuffer : pointer;
PrefMaxLen : LongInt;
var EntriesRead : DWORD;
var TotalEntries : DWORD;
var ResumeHandle : DWORD) : DWORD; stdcall;
TNetApiBufferFree = function(Buffer : pointer) : DWORD; stdcall;
PTransportInfo = ^TTransportInfo;
TTransportInfo = record
quality_of_service : DWORD;
number_of_vcs : DWORD;
transport_name : PWChar;
transport_address : PWChar;
wan_ish : boolean;
end;
type
TaPInAddr = array[0..10] of PInAddr;
PaPInAddr = ^TaPInAddr;
var
HostName: array [0..MAX_PATH] of char;
NameLen: Integer;
WSData: TWSAData;
lpHostEnt: PHostEnt;
pptr: PaPInAddr;
var E,ResumeHandle,
EntriesRead,
TotalEntries : DWORD;
FLibHandle : THandle;
sMachineName: String;
pBuffer : pointer;
pInfo : PTransportInfo;
FNetTransportEnum : TNetTransportEnum;
FNetApiBufferFree : TNetApiBufferFree;
pszServer : array[0..128] of WideChar;
i : integer;
Reg: TRegistry;
strGUID: String;
iPos0,iPos1: Integer;
begin
sMachineName := '\\127.0.0.1';
// Setup and load from DLL
pBuffer := nil;
ResumeHandle := 0;
FLibHandle := LoadLibrary('NETAPI32.DLL');
// Execute the external function
if FLibHandle <> 0 then begin
@FNetTransportEnum := GetProcAddress(FLibHandle,'NetWkstaTransportEnum');
@FNetApiBufferFree := GetProcAddress(FLibHandle,'NetApiBufferFree');
E := FNetTransportEnum(StringToWideChar(sMachineName,pszServer,129),0,
pBuffer,-1,EntriesRead,TotalEntries,Resumehandle);
if E = 0 then begin
pInfo := pBuffer;
if WSAStartup(MakeWord(2,0), WSData) <> 0 then Exit;
try
NameLen := sizeof(HostName);
fillchar(HostName, NameLen, 0);
NameLen := GetHostName(HostName, NameLen);
if NameLen = SOCKET_ERROR then Exit;
lpHostEnt := GetHostByName(HostName);
if lpHostEnt = Nil then Exit;
I := 0;
pPtr := PaPInAddr(lpHostEnt^.h_addr_list);
while pPtr^[I] <> nil do
begin
// Enumerate all protocols - look for TCPIP
inc(pInfo);
if pos('TCPIP',UpperCase(pInfo^.transport_name)) <> 0 then begin
if inet_ntoa(pptr^[I]^) = IP then
begin
Reg := TRegistry.Create;
try
Reg.RootKey := HKEY_LOCAL_MACHINE;
iPos0 := Pos('{',pInfo^.transport_name);
iPos1 := Pos('}',pInfo^.transport_name);
strGUID := Copy(pInfo^.transport_name, iPos0 ,iPos1 - iPos0 + 1);
if Reg.OpenKey('SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\'+ strGUID,false) then
begin
if Reg.ValueExists('MTU') then
ShowMessage(Format('IP地址:%s的MTU值为%d',[IP,reg.ReadInteger('MTU')]))
else begin
ShowMessage(Format('IP地址:%s的MTU值未设置!',[IP]));
//设置MTU值为1500
Reg.WriteInteger('MTU',1500);
end;
Reg.CloseKey;
end;
finally
Reg.Free;
end;
end;
end;
Inc(I);
end;
finally
WSACleanup;
end;
if pBuffer <> nil then FNetApiBufferFree(pBuffer);
end;
try
FreeLibrary(FLibHandle);
except
// 错误处理
end;
end;
end;