How do I retrieve the IP of the system?

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  14 years ago

  by sharmamandy

  mandeep

  , India

  Joined 14 years ago

  Tell me the steps how to make and include lib file to MFC project so i can get the ip address of the system...if somebody can help me then tell me .....how all this job i hav to do...from very starting.. below is the code that i found ... that may be used for get the ip address of the system... thanks     There is a function gethostbyname for getting the ip address using Winsock. This function will retrieve the ip address details into a variable of type "structure hostent".      The first step in creating this program is to ensure the socket library is initialized, if it is not initialized else-where. The next step is to call the gethostbyname function which will return a pointer to the hostent structure. This pointer to the hostent structure can be used to get the ip address into a sockaddr_in type.     In fact it is possible to get the ip without using the sockaddr_in structure also. But using sockaddr_in is a much cleaner way of doing the work.     Please feel free to copy/paste the function below and use/manipulate it in your applications wherever needed. #include <winsock2.h>  void GetHostIP() {     char *Ip;     WSADATA wsaData;     struct hostent *pHostEnt;      struct sockaddr_in tmpSockAddr; //placeholder for the ip address     // Not needed if it is already taken care by some other part of the application     WSAStartup(MAKEWORD(2,0),&wsaData);      char hostname[25];     strcpy(hostname,"Test Computer Name")     //This will retrieve the ip details and put it into pHostEnt structure     pHostEnt = gethostbyname(hostname);     if(pHostEnt == NULL)     {         printf("Error occured: %s\n",GetLastError());         return;     }     memcpy(&tmpSockAddr.sin_addr,pHostEnt->h_addr,pHostEnt->h_length);     Ip = NULL;     Ip = new char[17];     strcpy(Ip,inet_ntoa(tmpSockAddr.sin_addr));     printf("Ip Address of the machine %s is %s\n",Ip);     // Not needed if it is already taken care by some other part of the application     WSACleanup();     delete [] Ip; } Note: The socket programs in MFC need the library ws2_32.lib to be referenced before linking. Otherwise the VC++ linker throws errors. mandeep

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