关于 error LNK2019 无法解析的外部符号
首先，我在网上找到了很多关于这类型错误的博客什么之类的。我也看了一下，但是问题还未解决。
源代码如下：
#ifdef _MSC_VER//*// * we do not want the warnings about the old deprecated and unsecure CRT functions// * since these examples can be compiled under *nix as well// */#define _CRT_SECURE_NO_WARNINGS#endif#include "pcap.h"#ifndef WIN32 #include <sys/socket.h> #include <netinet/in.h>#else #include <winsock.h>#endif// Function prototypesvoid ifprint(pcap_if_t *d);char *iptos(u_long in);char* ip6tos(struct sockaddr *sockaddr, char *address, int addrlen);int main(){ pcap_if_t *alldevs; pcap_if_t *d; char errbuf[PCAP_ERRBUF_SIZE+1]; /* Retrieve the device list */ if(pcap_findalldevs(&alldevs, errbuf) == -1) { fprintf(stderr,"Error in pcap_findalldevs: %s\n", errbuf); exit(1); } /* Scan the list printing every entry */ for(d=alldevs;d;d=d->next) { ifprint(d); } /* Free the device list */ pcap_freealldevs(alldevs); return 1;}/* Print all the available information on the given interface */void ifprint(pcap_if_t *d){ pcap_addr_t *a; char ip6str[128]; /* Name */ printf("%s\n",d->name); /* Description */ if (d->description) printf("\tDescription: %s\n",d->description); /* Loopback Address*/ printf("\tLoopback: %s\n",(d->flags & PCAP_IF_LOOPBACK)?"yes":"no"); /* IP addresses */ for(a=d->addresses;a;a=a->next) { printf("\tAddress Family: #%d\n",a->addr->sa_family); switch(a->addr->sa_family) { case AF_INET: printf("\tAddress Family Name: AF_INET\n"); if (a->addr) printf("\tAddress: %s\n",iptos(((struct sockaddr_in *)a->addr)->sin_addr.s_addr)); if (a->netmask) printf("\tNetmask: %s\n",iptos(((struct sockaddr_in *)a->netmask)->sin_addr.s_addr)); if (a->broadaddr) printf("\tBroadcast Address: %s\n",iptos(((struct sockaddr_in *)a->broadaddr)->sin_addr.s_addr)); if (a->dstaddr) printf("\tDestination Address: %s\n",iptos(((struct sockaddr_in *)a->dstaddr)->sin_addr.s_addr)); break; case AF_INET6: printf("\tAddress Family Name: AF_INET6\n");#ifndef __MINGW32__ /* Cygnus doesn't have IPv6 */ if (a->addr) printf("\tAddress: %s\n", ip6tos(a->addr, ip6str, sizeof(ip6str)));#endif break; default: printf("\tAddress Family Name: Unknown\n"); break; } } printf("\n");}/* From tcptraceroute, convert a numeric IP address to a string */#define IPTOSBUFFERS 12char *iptos(u_long in){ static char output[IPTOSBUFFERS][3*4+3+1]; static short which; u_char *p; p = (u_char *)∈ which = (which + 1 == IPTOSBUFFERS ? 0 : which + 1); sprintf(output[which], "%d.%d.%d.%d", p[0], p[1], p[2], p[3]); return output[which];}#ifndef __MINGW32__ /* Cygnus doesn't have IPv6 */char* ip6tos(struct sockaddr *sockaddr, char *address, int addrlen){ socklen_t sockaddrlen; #ifdef WIN32 sockaddrlen = sizeof(struct sockaddr_in6); #else sockaddrlen = sizeof(struct sockaddr_storage); #endif if(getnameinfo(sockaddr, sockaddrlen, address, addrlen, NULL, 0, NI_NUMERICHOST) != 0) address = NULL; return address;}#endif /* __MINGW32__ */
错误4error LNK1120: 3 个无法解析的外部命令
说明，此程序要安装Wincap4_1_2 以及相关sdk开发包。
谢谢各位大神了！
[解决办法]
1.可能是对应的库没有包含到工程中.
2.库版本不对,没有_pcap_freealldevs或者参数不匹配.所以link是查不到.
[解决办法]
你没包含相应版本的lib文件