帮助此代码（给出 STATUS_ACCESS_VIOLATION ）
下面是一段代码，我想显示用户输入的地址的IP地址，但它给了我STATUS_ACCESS_VIOLATION，我不明白其原因。
它编译得很好。这是
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
// Link to ws2_32.lib
#include <winsock2.h>
#include <stdio.h>
#include <stdlib.h>
struct protoent *proto=NULL;
int main(int count, char *strings[])
{
int pid;
struct hostent *host;
struct sockaddr_in addr;
if ( count != 3 )
{
printf("usage: %s <addr> < Adressflag = 0 for name and 1 for IP > /n", strings[0] );
exit(0);
}
if ( count == 3 )
{
int flag = atoi(strings[2]);
printf("flag is %d",flag);
if ( flag == 0)
{
pid = getpid();
proto = getprotobyname("ICMP");
host = gethostbyname(strings[1]);
bzero(&addr, sizeof(addr));
addr.sin_family = host->h_addrtype;
addr.sin_port = 0;
addr.sin_addr.s_addr = *(long*)host->h_addr;
//traceroute(&addr);
printf("IP of %s is %s",host->h_name , host-> h_addr);
}
else
{
}
}
return 0;
}
我在 cygwin 中运行的。有人知道这个错误吗？有人能告诉我我做错了什么吗？
Below is a code where I want to display the ip address of the address entered by the user but it gives me STATUS_ACCESS_VIOLATION and I am not understanding the reason for it.
It compiles fine. Here is it
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
// Link to ws2_32.lib
#include <winsock2.h>
#include <stdio.h>
#include <stdlib.h>
struct protoent *proto=NULL;
int main(int count, char *strings[])
{
int pid;
struct hostent *host;
struct sockaddr_in addr;
if ( count != 3 )
{
printf("usage: %s <addr> < Adressflag = 0 for name and 1 for IP > /n", strings[0] );
exit(0);
}
if ( count == 3 )
{
int flag = atoi(strings[2]);
printf("flag is %d",flag);
if ( flag == 0)
{
pid = getpid();
proto = getprotobyname("ICMP");
host = gethostbyname(strings[1]);
bzero(&addr, sizeof(addr));
addr.sin_family = host->h_addrtype;
addr.sin_port = 0;
addr.sin_addr.s_addr = *(long*)host->h_addr;
//traceroute(&addr);
printf("IP of %s is %s",host->h_name , host-> h_addr);
}
else
{
}
}
return 0;
}
I am running this in cygwin. Is anyone aware of the error and can anyone tell what am I doing wrong ??
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评论（2）
您真的需要前面的 * 吗？
这意味着您正在取消引用某些随机地址。
您也不检查主机是否为空。
Do you really need the * on the front?
That means you are de-referencing some random address.
You are also not checking host for null.
您不能仅将
char*转换为long*来从字符串中获取数字，而且您可能也不应该取消引用。You can't just cast a
char*tolong*to get a number from a string, and you probably shouldn't be dereferencing, either.