该如何使用IcmpSendEcho

使用IcmpSendEcho函数，您需要做以下几步：

1. 加载icmp.dll库文件。

2. 创建ICMP Echo请求数据包。

3. 打开ICMP句柄。

4. 使用IcmpSendEcho函数发送ICMP Echo请求。

5. 处理IcmpSendEcho函数返回的ICMP Echo响应数据包。

下面是一个简单的使用IcmpSendEcho函数的示例代码：

#include <winsock2.h>
#include <iphlpapi.h>
#include <icmpapi.h>
#include <stdio.h>

#pragma comment(lib, "iphlpapi.lib")
#pragma comment(lib, "ws2_32.lib")

int main()
{
    HANDLE icmpHandle = IcmpCreateFile();
    if (icmpHandle == INVALID_HANDLE_VALUE)
    {
        printf("Failed to create ICMP handle.\n");
        return 1;
    }

    char ipAddress[] = "www.google.com";
    DWORD ipAddr = inet_addr(ipAddress);
    if (ipAddr == INADDR_NONE)
    {
        hostent* host = gethostbyname(ipAddress);
        if (host == NULL)
        {
            printf("Failed to get IP address of %s.\n", ipAddress);
            return 1;
        }
        ipAddr = *((DWORD*)host->h_addr);
    }

    const int bufferSize = 32;
    char buffer[bufferSize];
    memset(buffer, 0, bufferSize);

    int replySize = sizeof(ICMP_ECHO_REPLY) + bufferSize;
    LPVOID replyBuffer = (void*)malloc(replySize);
    if (replyBuffer == NULL)
    {
        printf("Failed to allocate memory for reply buffer.\n");
        return 1;
    }

    ICMP_ECHO_REPLY* reply = (ICMP_ECHO_REPLY*)replyBuffer;

    int result = IcmpSendEcho(icmpHandle, ipAddr, buffer, bufferSize, NULL, replyBuffer, replySize, 1000);
    if (result == 0)
    {
        printf("IcmpSendEcho failed with error: %ld\n", GetLastError());
        return 1;
    }

    printf("Reply from %s: bytes=%d time=%ldms TTL=%d\n", ipAddress, reply->DataSize, reply->RoundTripTime, reply->Options.Ttl);

    free(replyBuffer);
    IcmpCloseHandle(icmpHandle);

    return 0;
}

这个示例代码会尝试向www.google.com发送ICMP Echo请求，并输出响应数据包的信息。注意，这个示例代码仅供参考，并不保证在所有环境中都能正常工作。