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例如,在Windows中,如果我想要的gethostbyname有意義的錯誤信息,我需要手動映射錯誤代碼信息,如下所示,有沒有簡單的方法來做宏到字符串映射?
#include <stdio.h>
#include <winsock2.h>
#pragma comment(lib, "ws2_32.lib")
int
main(void)
{
struct hostent *host;
WSAData wsaData;
int errcode;
if (WSAStartup(MAKEWORD(2, 2), &wsaData)) {
perror("WSAStartup failed");
exit(-1);
}
host = gethostbyname("www.google.com");
if (host != NULL) {
printf("the offical name of the host is: %s\n", host->h_name);
} else {
errcode = WSAGetLastError();
printf("the error code is %d\n", errcode);
if (errcode == WSAENETDOWN)
perror("network down");
else if (errcode == WSANOTINITIALISED)
perror("call WSAStartup before");
else if ...
perror("gethostbyname failed");
return -1;
}
return 0;
}
有沒有簡單的方法來做到這一點?
謝謝。