i need modify gateway of network setting. see there's defaultgateway , dhcpdefaultgateway params in registry. here's code change these values:
#include <windows.h> #include <string> #include <iostream> #pragma comment(lib,"ws2_32.lib") using namespace std; void getlanadaptername( char* szlanadaptername ); bool notifyipchange( lpctstr lpszadaptername, int nindex, lpctstr pipaddress, lpctstr pnetmask ); char szgate[100] = { 0 }; dword dwgatetype; char szdhcpgate[100] = { 0 }; dword dwdhcpgatetype; bool getregip(lpctstr lpszadaptername) { hkey hkey; string strkeyname = "system\\currentcontrolset\\services\\tcpip\\parameters\\interfaces\\"; strkeyname += lpszadaptername; if (::regopenkeyex(hkey_local_machine, strkeyname.c_str(), 0, key_all_access, &hkey) != error_success) return false; ulong x = sizeof(szgate); auto ret = ::regqueryvalueex(hkey, "defaultgateway", 0, &dwgatetype, (unsigned char*)szgate, &x); x = sizeof(szdhcpgate); ret = ::regqueryvalueex(hkey, "dhcpdefaultgateway", 0, &dwdhcpgatetype, (unsigned char*)szdhcpgate, &x); ::regclosekey(hkey); return true; } bool setregip(lpctstr lpszadaptername, const char* sznewgateway, const char* sznewdhcpgateway) { hkey hkey; string strkeyname = "system\\currentcontrolset\\services\\tcpip\\parameters\\interfaces\\"; strkeyname += lpszadaptername; if (::regopenkeyex(hkey_local_machine, strkeyname.c_str(), 0, key_all_access, &hkey) != error_success) return false; int x; x = strlen(sznewgateway); if (x) ::regsetvalueex(hkey, "defaultgateway", 0, dwgatetype, (unsigned char*)sznewgateway, x); x = strlen(sznewdhcpgateway); if (x) ::regsetvalueex(hkey, "dhcpdefaultgateway", 0, dwdhcpgatetype, (unsigned char*)sznewdhcpgateway, x); ::regclosekey(hkey); return true; } int main() { char adaptername[ max_path ] = ""; getlanadaptername( adaptername ); if (!getregip(adaptername)) // adapter return 1; if (!setregip(adaptername, "1.1.1.1", "2.2.2.2")) // change ip never work return 1; //if (!setregip(adaptername, szgate, szdhcpgate)) //return 1; return 0; } void getlanadaptername(char* szlanadaptername) { hkey hkey, hsubkey, hndiintkey; if( ::regopenkeyex( hkey_local_machine, "system\\currentcontrolset\\control\\class\\{4d36e972-e325-11ce-bfc1-08002be10318}", 0, key_read, &hkey ) != error_success ) return; dword dwindex = 0; dword dwbufsize = 256; dword dwdatatype; char szsubkey[256]; unsigned char szdata[256]; while( ::regenumkeyex( hkey, dwindex++, szsubkey, &dwbufsize, null, null, null, null ) == error_success ) { if( ::regopenkeyex( hkey, szsubkey, 0, key_read, &hsubkey ) == error_success ) { if( ::regopenkeyex( hsubkey, "ndi\\interfaces", 0, key_read, &hndiintkey ) == error_success ) { dwbufsize = 256; if( ::regqueryvalueex( hndiintkey, "lowerrange", 0, &dwdatatype, szdata, &dwbufsize ) == error_success ) { if( strcmp( (char*)szdata, "ethernet" ) == 0 ) // { dwbufsize = 256; if( ::regqueryvalueex( hsubkey, "driverdesc", 0, &dwdatatype, szdata, &dwbufsize ) == error_success ) { // dwbufsize = 256; if( ::regqueryvalueex( hsubkey, "netcfginstanceid", 0, &dwdatatype, szdata, &dwbufsize ) == error_success ) { strcpy( szlanadaptername, (const char *)szdata ); break; } } } } ::regclosekey( hndiintkey ); } ::regclosekey(hsubkey); } dwbufsize = 256; } /* end of while */ ::regclosekey(hkey); } but it's not working, guess there must flush after modifying registry value. google found similar problem flushing dns config, simple ipconfig /registerdns. how flush gateway?
here 1 way can accomplish same:
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