获取本机网卡ip地址的c程序
时间: 2024-08-14 15:09:11 浏览: 35
在C语言中,获取本机网卡IP地址通常涉及到网络编程和系统调用。下面是一个简单的示例,使用了Windows平台下的GetAdaptersAddresses函数,如果在Unix/Linux环境中,需要使用不同的库函数(如getifaddrs、getaddrinfo等)。请注意,这个示例假设你有网络访问权限并允许读取本地网络信息。
```c
#include <stdio.h>
#include <string.h>
#include <windows.h> // Windows-specific header for GetAdaptersAddresses
// Structure to store IP address and prefix length
typedef struct _IP_ADAPTER_ADDRESSES {
ULONG Length;
ULONG Flags;
ULONG IfIndex;
char* InterfaceDescription;
ULONG FirstUnicastAddress;
ULONG AddressLength;
ULONG BroadcastAddress;
ULONG Mask;
ULONG Metrics;
IP_ADAPTER_ADDRESSES* Next;
IP_ADDRESS_UNICAST_ADDRESSses* UnicastAddresses;
IP_ADDRESS_MULTICAST_ADDRESSses* MulticastAddresses;
IP_PREFIX_INFORMATION* PrefixInformation;
} IP_ADAPTER_ADDRESSES;
void getLocalIPAddress(char* ipBuffer) {
IP_ADAPTER_ADDRESSES *adapterInfo = NULL, *currentAdapter = NULL;
ULONG outBufferSize = sizeof(IP_ADAPTER_ADDRESSES);
ULONG neededSize = 0;
// Call the Windows function to retrieve adapter info
if (GetAdaptersAddresses(AF_UNSPEC, GAA_FLAG_INCLUDE_ALL_INTERFACES, NULL, &adapterInfo, &outBufferSize)) {
printf("Failed to get network interfaces.\n");
return;
}
// Check for any errors
if (adapterInfo->Length != outBufferSize) {
neededSize = adapterInfo->Length;
HeapFree(GetProcessHeap(), 0, adapterInfo);
adapterInfo = (IP_ADAPTER_ADDRESSES*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, neededSize);
if (!adapterInfo) {
printf("Memory allocation failed.\n");
return;
}
if (GetAdaptersAddresses(AF_UNSPEC, GAA_FLAG_INCLUDE_ALL_INTERFACES, NULL, &adapterInfo, &outBufferSize)) {
printf("Failed to get network interfaces.\n");
HeapFree(GetProcessHeap(), 0, adapterInfo);
return;
}
}
// Iterate through adapters to find the first non-loopback interface
for (currentAdapter = adapterInfo; currentAdapter != NULL; currentAdapter = currentAdapter->Next) {
if (strcmp(currentAdapter->InterfaceDescription, "Loopback Pseudo-Interface") != 0) {
break;
}
}
// Copy the first unicast IP address to the provided buffer
if (currentAdapter->FirstUnicastAddress) {
strncpy(ipBuffer, inet_ntoa(((IP_ADDRESS*)¤tAdapter->FirstUnicastAddress)->u.Byte), sizeof(ipBuffer));
} else {
printf("No unicast IP addresses found.\n");
}
// Clean up
HeapFree(GetProcessHeap(), 0, adapterInfo);
}
int main() {
char ipAddress[INET_ADDRSTRLEN];
getLocalIPAddress(ipAddress);
printf("Your local IP address is: %s\n", ipAddress);
return 0;
}
```
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