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近日偶要做个程序,需要获得外网IP,偶去网上找相关资料,发现都不尽如人意,有的
只能获得本地网卡的IP,有的通过httpget控件获取IP,还有甚者做个asp再调用偶是个
懒人,而且上面提到的方法,不是获取不了就是速度太慢或者是太麻烦,无意中发现
有个系统提供的API,利用它能够获取适配器信息,其中就包括外网IP,下面把代码给
大家,重点处我做了注释。
注意: 程序必须运行在直接拨号联网的用户,不适用于内网用户。
//常量定义
Const
MAX_HOSTNAME_LEN = 128;
MAX_DOMAIN_NAME_LEN = 128;
MAX_SCOPE_ID_LEN = 256;
MAX_ADAPTER_NAME_LENGTH = 256;
MAX_ADAPTER_DESCRIPTION_LENGTH = 128;
MAX_ADAPTER_ADDRESS_LENGTH = 8;
//定义相关结构
Type
TIPAddressString = Array[0..4*4-1] of Char;
PIPAddrString = ^TIPAddrString;
TIPAddrString = Record
Next : PIPAddrString;
IPAddress : TIPAddressString;
IPMask : TIPAddressString;
Context : Integer;
End;
PFixedInfo = ^TFixedInfo;
TFixedInfo = Record { FIXED_INFO }
HostName : Array[0..MAX_HOSTNAME_LEN+3] of Char;
DomainName : Array[0..MAX_DOMAIN_NAME_LEN+3] of Char;
CurrentDNSServer : PIPAddrString;
DNSServerList : TIPAddrString;
NodeType : Integer;
ScopeId : Array[0..MAX_SCOPE_ID_LEN+3] of Char;
EnableRouting : Integer;
EnableProxy : Integer;
EnableDNS : Integer;
End;
PIPAdapterInfo = ^TIPAdapterInfo;
TIPAdapterInfo = Record { IP_ADAPTER_INFO }
Next : PIPAdapterInfo;
ComboIndex : Integer;
AdapterName : Array[0..MAX_ADAPTER_NAME_LENGTH+3] of Char;
Description : Array[0..MAX_ADAPTER_DESCRIPTION_LENGTH+3] of Char;
AddressLength : Integer;
Address : Array[1..MAX_ADAPTER_ADDRESS_LENGTH] of Byte;
Index : Integer;
_Type : Integer;
DHCPEnabled : Integer;
CurrentIPAddress : PIPAddrString;
IPAddressList : TIPAddrString;
GatewayList : TIPAddrString;
DHCPServer : TIPAddrString;
HaveWINS : Bool;
PrimaryWINSServer : TIPAddrString;
SecondaryWINSServer : TIPAddrString;
LeaseObtained : Integer;
LeaseExpires : Integer;
End;
type
TGetAdaptersInfo=function(AI : PIPAdapterInfo; Var BufLen : Integer) : Integer;StdCall;
var
GetAdaptersInfo:TGetAdaptersInfo;
h:hmodule;
implementation
function Loadiphlpapidll:boolean;//动态加载iphlpapi.dll中的GetAdaptersInfo
begin
if h>0 then exit;
h:=Loadlibrary(‘iphlpapi.dll‘);
if h>0 then
GetAdaptersInfo:=GetProcAddress(h,‘GetAdaptersInfo‘);
result:=assigned(GetAdaptersInfo);
end;
function GetWanIP: string;//获取外网IP
Var
AI,Work : PIPAdapterInfo;
Size : Integer;
Res : Integer;
Description:string;
WanIP:string;
Function GetAddrString(Addr : PIPAddrString) : String;
Begin
Result := ‘‘;
While (Addr <> nil) do Begin
Result := Result+‘A: ‘+Addr^.IPAddress+‘ M: ‘+Addr^.IPMask+#13;
Addr := Addr^.Next;
End;
End;
begin
Loadiphlpapidll;
result:=‘无法获得外网IP‘;
Size := 5120;
GetMem(AI,Size);
Res := GetAdaptersInfo(AI,Size);
If (Res <> ERROR_SUCCESS) Then
Begin
MessageBoxA(0,‘获取外网IP失败 ‘,‘错误‘,MB_OK or MB_ICONERROR);
exit;
End;
Work := AI;
Repeat
Description:=strpas(Work^.Description);
if pos(‘WAN‘,Description)>0 then
begin
WanIP:=GetAddrString(@Work^.IPAddressList);
//这里返回的WanIP是这种格式 A: 222.111.25.32 M: 255.255.255.0
//其中A到M中间就是外网IP了
WanIP:=copy(WanIP,pos(‘:‘,WanIP)+1,pos(‘M‘,WanIP)-pos(‘:‘,WanIP)-2);
result:=trim(WanIP);//这里就是最终的外网IP了
exit;
end;
Work := Work^.Next;
Until (Work = nil);
FreeMem(AI);
end;
http://blog.csdn.net/yanjiaye520/article/details/7702409
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原文地址:http://www.cnblogs.com/findumars/p/4999282.html