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前段时间写偷网工具用到过
 贴点代码给你，自己看，代码比较乱。 
BOOL RegSetIP(LPCTSTR lpszAdapterName, LPCTSTR pIPAddress, LPCTSTR pNetMask, LPCTSTR pNetGate)
{
HKEY hKey;
char strKeyName[MAX_PATH] = "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces\\";
strcat(strKeyName, GetAnsicString(lpszAdapterName));
if(RegOpenKeyExA(HKEY_LOCAL_MACHINE,
strKeyName,
0,
KEY_WRITE,
&hKey) != ERROR_SUCCESS)
return FALSE;
char mszIPAddress[100];
char mszNetMask[100];
char mszNetGate[100];
strncpy(mszIPAddress, GetAnsicString(pIPAddress), 98);
strncpy(mszNetMask, GetAnsicString(pNetMask), 98);
strncpy(mszNetGate, GetAnsicString(pNetGate), 98);
int nIP, nMask, nGate;
nIP = strlen(mszIPAddress);
nMask = strlen(mszNetMask);
nGate = strlen(mszNetGate);
*(mszIPAddress + nIP + 1) = 0x00;
nIP += 2;
*(mszNetMask + nMask + 1) = 0x00;
nMask += 2;
*(mszNetGate + nGate + 1) = 0x00;
nGate += 2;
RegSetValueExA(hKey, "IPAddress", 0, REG_MULTI_SZ, (unsigned char*)mszIPAddress, nIP);
RegSetValueExA(hKey, "SubnetMask", 0, REG_MULTI_SZ, (unsigned char*)mszNetMask, nMask);
RegSetValueExA(hKey, "DefaultGateway", 0, REG_MULTI_SZ, (unsigned char*)mszNetGate, nGate);
RegSetValueExA(hKey, "NameServer", 0, REG_SZ, (unsigned char*)mszNetGate, nGate);
RegCloseKey(hKey);
return TRUE;
}
BOOL NotifyIPChange(LPCTSTR lpszAdapterName, LPCTSTR pIPAddress, LPCTSTR pNetMask)
{
BOOL bResult = FALSE;
HINSTANCE hDhcpDll;
DHCPNOTIFYPROC pDhcpNotifyProc;
// WCHAR wcAdapterName[256];
// MultiByteToWideChar(CP_ACP, 0, GetAnsicString(lpszAdapterName), -1, wcAdapterName,256);
if((hDhcpDll = LoadLibraryA("dhcpcsvc")) == NULL)
return FALSE;
if((pDhcpNotifyProc = (DHCPNOTIFYPROC)GetProcAddress(hDhcpDll, "DhcpNotifyConfigChange")) != NULL)
if((pDhcpNotifyProc)(NULL, (LPWSTR)lpszAdapterName, TRUE, 0, inet_addr(GetAnsicString(pIPAddress)), inet_addr(GetAnsicString(pNetMask)), 0) == ERROR_SUCCESS)
bResult = TRUE;
FreeLibrary(hDhcpDll);
return bResult;
}
BOOL SetIP(LPCTSTR lpszAdapterName, LPCTSTR pIPAddress, LPCTSTR pNetMask, LPCTSTR pNetGate)
{
if(!RegSetIP(lpszAdapterName, pIPAddress, pNetMask, pNetGate))
return FALSE;
if(!NotifyIPChange(lpszAdapterName, pIPAddress, pNetMask))
return FALSE;
return TRUE;
}
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