GetAdaptersInfo -20151116 防止返回的mac出现null
20151116
From:http://blog.csdn.net/weiyumingwww/article/details/17554461
转载URL：http://www.cnblogs.com/ourran/p/4968502.html
测试环境win7 x64 vs2013
工程下载地址：链接：http://pan.baidu.com/s/1pJAbwgz 密码：ifst
代码改为：
mac.h 内容
#ifndef __MAC_MAC_H #define __MAC_MAC_H #include <windows.h> #include <iphlpapi.h> // API GetAdaptersInfo 头文件 #include <shlwapi.h> // API StrCmpIA 头文件 #pragma comment(lib, "iphlpapi.lib") #pragma comment(lib, "shlwapi.lib") #include <Strsafe.h> // API StringCbPrintfA 头文件 #include <shellapi.h> // API lstrcpyA 头文件 #define BUF_SIZE 254 #define MAX_SIZE 254 UINT GetAdapterCharacteristics(char* adapter_name); int GetMAC(BYTE mac[BUF_SIZE]); void GetMacAddress( char* mac ); #endif
mac.c 内容
#include "stdafx.h"
#include "mac.h"
//////////////////////////////////////
// 功能：获取适配器特性
// 参数：
// adapter_name 适配器 ID
// 返回值：成功则返回由参数指定的适配器的特性标志，是一个 DWORD 值，失败返回 0
//
UINT GetAdapterCharacteristics(char* adapter_name)
{
if(adapter_name == NULL || adapter_name[0] == 0)
return 0;
HKEY root = NULL;
// 打开存储适配器信息的注册表根键
if(ERROR_SUCCESS != RegOpenKeyExA(HKEY_LOCAL_MACHINE, "SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002BE10318}", 0, KEY_READ, &root))
return 0;
DWORD subkeys = 0;
// 获取该键下的子键数
if(ERROR_SUCCESS != RegQueryInfoKeyA(root, NULL, NULL, NULL, &subkeys, NULL, NULL, NULL, NULL, NULL, NULL, NULL))
subkeys = 100;
DWORD ret_value = 0;
for(DWORD i = 0; i < subkeys; i++)
{
// 每个适配器用一个子键存储，子键名为从 0 开始的 4 位数
char subkey[MAX_SIZE];
memset(subkey, 0, MAX_SIZE);
StringCbPrintfA(subkey, MAX_SIZE, "%04u", i);
// 打开该子键
HKEY hKey = NULL;
if(ERROR_SUCCESS != RegOpenKeyExA(root, subkey, 0, KEY_READ, &hKey))
continue;
// 获取该子键对应的适配器 ID，存于 name 中
char name[MAX_PATH];
DWORD type = 0;
DWORD size = MAX_PATH;
if(ERROR_SUCCESS != RegQueryValueExA(hKey, "NetCfgInstanceId", NULL, &type, (LPBYTE)name, &size))
{
RegCloseKey(hKey);
continue;
}
// 对比该适配器 ID 是不是要获取特性的适配器 ID
if(StrCmpIA(name, adapter_name) != 0)
{
RegCloseKey(hKey);
continue;
}
// 读取该适配器的特性标志，该标志存储于值 Characteristics 中
DWORD val = 0;
size = 4;
LSTATUS ls = RegQueryValueExA(hKey, "Characteristics", NULL, &type, (LPBYTE)&val, &size);
RegCloseKey(hKey);
if(ERROR_SUCCESS == ls)
{
ret_value = val;
break;
}
}
RegCloseKey(root);
return ret_value;
}
//////////////////////////////////////
// 功能：获取 Mac 地址的二进制数据
// 参数：
// mac 用于输出 Mac 地址的二进制数据的缓冲区指针
// 返回值：成功返回 mac 地址的长度，失败返回 0，失败时 mac 中保存一些简单的错误信息，可适当修改，用于调试
//
int GetMAC(BYTE mac[BUF_SIZE])
{
#define NCF_PHYSICAL 0x4
DWORD AdapterInfoSize = 0;
if(ERROR_BUFFER_OVERFLOW != GetAdaptersInfo(NULL, &AdapterInfoSize))
{
StringCbPrintfA((LPSTR)mac, BUF_SIZE, "GetMAC Failed! ErrorCode: %d", GetLastError());
return 0;
}
void* buffer = malloc(AdapterInfoSize);
if(buffer == NULL)
{
lstrcpyA((LPSTR)mac, "GetMAC Failed! Because malloc failed!");
return 0;
}
PIP_ADAPTER_INFO pAdapt = (PIP_ADAPTER_INFO)buffer;
if(ERROR_SUCCESS != GetAdaptersInfo(pAdapt, &AdapterInfoSize))
{
StringCbPrintfA((LPSTR)mac, BUF_SIZE, "GetMAC Failed! ErrorCode: %d", GetLastError());
free(buffer);
return 0;
}
int mac_length = 0;
while(pAdapt)
{
if(pAdapt->AddressLength >= 6 && pAdapt->AddressLength <= 8)
{
memcpy(mac, pAdapt->Address, pAdapt->AddressLength);
mac_length = pAdapt->AddressLength;
UINT flag = GetAdapterCharacteristics(pAdapt->AdapterName);
BOOL is_physical = ((flag & NCF_PHYSICAL) == NCF_PHYSICAL);
if(is_physical)
break;
}
pAdapt = pAdapt->Next;
}
free(buffer);
return mac_length;
}
//////////////////////////////////////
// 功能：获取 Mac 地址，使用时直接调用此函数即可
// 参数：
// mac 用于存储 Mac 地址的缓冲区指针
// 返回值：无返回值，函数执行完后会把 Mac 地址以16进制的形式存于参数指定的缓冲区中，若有错误，缓冲区中保存的是错误信息
//
void GetMacAddress( char* mac )
{
BYTE buf[BUF_SIZE];
memset(buf, 0, BUF_SIZE);
int len = GetMAC(buf);
if(len <= 0)
{
lstrcpyA(mac, (LPCSTR)buf);
return;
}
if(len == 6)
StringCbPrintfA(mac, BUF_SIZE, "%02X-%02X-%02X-%02X-%02X-%02X", buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
else
StringCbPrintfA(mac, BUF_SIZE, "%02X-%02X-%02X-%02X-%02X-%02X-%02X-%02X", buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]);
}
用方法获取到的mac在部分机器上会出现获取到的mac为null;
20150923
From:https://msdn.microsoft.com/en-us/library/aa365917
控制台工程下载地址: 链接：http://pan.baidu.com/s/1o6xjJmy 密码：gyxo
mfc工程下载地址: 链接：http://pan.baidu.com/s/1pJORZw3 密码：djau
GetAdaptersInfo function
The GetAdaptersInfo function retrieves adapter information for the local computer.
On Windows XP and later: Use the GetAdaptersAddresses function instead of GetAdaptersInfo.
Syntax
DWORD GetAdaptersInfo( _Out_ PIP_ADAPTER_INFO pAdapterInfo, _Inout_ PULONG pOutBufLen );
Examples
This example retrieves the adapter information and prints various properties of each adapter.
#include <winsock2.h>
#include <iphlpapi.h>
#include <stdio.h>
#include <stdlib.h>
#pragma comment(lib, "IPHLPAPI.lib")
#define MALLOC(x) HeapAlloc(GetProcessHeap(), 0, (x))
#define FREE(x) HeapFree(GetProcessHeap(), 0, (x))
/* Note: could also use malloc() and free() */
int __cdecl main()
{
/* Declare and initialize variables */
// It is possible for an adapter to have multiple
// IPv4 addresses, gateways, and secondary WINS servers
// assigned to the adapter.
//
// Note that this sample code only prints out the
// first entry for the IP address/mask, and gateway, and
// the primary and secondary WINS server for each adapter.
PIP_ADAPTER_INFO pAdapterInfo;
PIP_ADAPTER_INFO pAdapter = NULL;
DWORD dwRetVal = 0;
UINT i;
/* variables used to print DHCP time info */
struct tm newtime;
char buffer[32];
errno_t error;
ULONG ulOutBufLen = sizeof (IP_ADAPTER_INFO);
pAdapterInfo = (IP_ADAPTER_INFO *) MALLOC(sizeof (IP_ADAPTER_INFO));
if (pAdapterInfo == NULL) {
printf("Error allocating memory needed to call GetAdaptersinfo
");
return 1;
}
// Make an initial call to GetAdaptersInfo to get
// the necessary size into the ulOutBufLen variable
if (GetAdaptersInfo(pAdapterInfo, &ulOutBufLen) == ERROR_BUFFER_OVERFLOW) {
FREE(pAdapterInfo);
pAdapterInfo = (IP_ADAPTER_INFO *) MALLOC(ulOutBufLen);
if (pAdapterInfo == NULL) {
printf("Error allocating memory needed to call GetAdaptersinfo
");
return 1;
}
}
if ((dwRetVal = GetAdaptersInfo(pAdapterInfo, &ulOutBufLen)) == NO_ERROR) {
pAdapter = pAdapterInfo;
while (pAdapter) {
printf(" ComboIndex: %d
", pAdapter->ComboIndex);
printf(" Adapter Name: %s
", pAdapter->AdapterName);
printf(" Adapter Desc: %s
", pAdapter->Description);
printf(" Adapter Addr: ");
for (i = 0; i < pAdapter->AddressLength; i++) {
if (i == (pAdapter->AddressLength - 1))
printf("%.2X
", (int) pAdapter->Address[i]);
else
printf("%.2X-", (int) pAdapter->Address[i]);
}
printf(" Index: %d
", pAdapter->Index);
printf(" Type: ");
switch (pAdapter->Type) {
case MIB_IF_TYPE_OTHER:
printf("Other
");
break;
case MIB_IF_TYPE_ETHERNET:
printf("Ethernet
");
break;
case MIB_IF_TYPE_TOKENRING:
printf("Token Ring
");
break;
case MIB_IF_TYPE_FDDI:
printf("FDDI
");
break;
case MIB_IF_TYPE_PPP:
printf("PPP
");
break;
case MIB_IF_TYPE_LOOPBACK:
printf("Lookback
");
break;
case MIB_IF_TYPE_SLIP:
printf("Slip
");
break;
default:
printf("Unknown type %ld
", pAdapter->Type);
break;
}
printf(" IP Address: %s
",
pAdapter->IpAddressList.IpAddress.String);
printf(" IP Mask: %s
", pAdapter->IpAddressList.IpMask.String);
printf(" Gateway: %s
", pAdapter->GatewayList.IpAddress.String);
printf(" ***
");
if (pAdapter->DhcpEnabled) {
printf(" DHCP Enabled: Yes
");
printf(" DHCP Server: %s
",
pAdapter->DhcpServer.IpAddress.String);
printf(" Lease Obtained: ");
/* Display local time */
error = _localtime32_s(&newtime, (__time32_t*) &pAdapter->LeaseObtained);
if (error)
printf("Invalid Argument to _localtime32_s
");
else {
// Convert to an ASCII representation
error = asctime_s(buffer, 32, &newtime);
if (error)
printf("Invalid Argument to asctime_s
");
else
/* asctime_s returns the string terminated by
*/
printf("%s", buffer);
}
printf(" Lease Expires: ");
error = _localtime32_s(&newtime, (__time32_t*) &pAdapter->LeaseExpires);
if (error)
printf("Invalid Argument to _localtime32_s
");
else {
// Convert to an ASCII representation
error = asctime_s(buffer, 32, &newtime);
if (error)
printf("Invalid Argument to asctime_s
");
else
/* asctime_s returns the string terminated by
*/
printf("%s", buffer);
}
} else
printf(" DHCP Enabled: No
");
if (pAdapter->HaveWins) {
printf(" Have Wins: Yes
");
printf(" Primary Wins Server: %s
",
pAdapter->PrimaryWinsServer.IpAddress.String);
printf(" Secondary Wins Server: %s
",
pAdapter->SecondaryWinsServer.IpAddress.String);
} else
printf(" Have Wins: No
");
pAdapter = pAdapter->Next;
printf("
");
}
} else {
printf("GetAdaptersInfo failed with error: %d
", dwRetVal);
}
if (pAdapterInfo)
FREE(pAdapterInfo);
return 0;
}