[英]Not able to connect in socket programming in C++ whereas in python, it works
我在 python 中有一段代碼。 它與客戶端Socket編程有關。 我想從“www.rtk2go.com”獲取 NTRIP 數據。 用 python 編寫的代碼運行良好,達到了目的。
import socket
import base64
server = "www.rtk2go.com"
port = "2101"
mountpoint = "leedgps"
username = ""
password = ""
def getHTTPBasicAuthString(username, password):
inputstring = username + ':' + password
pwd_bytes = base64.standard_b64encode(inputstring.encode("utf-8"))
pwd = pwd_bytes.decode("utf-8").replace('\n', '')
return pwd
pwd = getHTTPBasicAuthString(username, password)
print(pwd)
header = "GET /{} HTTP/1.0\r\n".format(mountpoint) + \
"User-Agent: NTRIP u-blox\r\n" + \
"Accept: */*\r\n" + \
"Authorization: Basic {}\r\n".format(pwd) + \
"Connection: close\r\n\r\n"
print(header)
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((server, int(port)))
s.sendto(header.encode('utf-8'), (server, int(port)))
resp = s.recv(1024)
try:
while True:
try:
data = s.recv(2048)
except:
pass
finally:
s.close()
我想在 c++ 代碼中實現相同的東西,經過一些在線教程后,我在 C++ 中編寫了以下代碼(我對 C++ 很陌生)
#include <iostream>
#include <stdio.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <string.h>
#include <netdb.h>
using namespace std;
#define SIZE 1000
#define PORT 2101
string base64Encoder(string input_str, int len_str) {
char char_set[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
char *res_str = (char *) malloc(SIZE * sizeof(char));
int index, no_of_bits = 0, padding = 0, val = 0, count = 0, temp;
int i, j, k = 0;
for (i = 0; i < len_str; i += 3) {
val = 0, count = 0, no_of_bits = 0;
for (j = i; j < len_str && j <= i + 2; j++) {
val = val << 8;
val = val | input_str[j];
count++;
}
no_of_bits = count * 8;
padding = no_of_bits % 3;
while (no_of_bits != 0) {
// retrieve the value of each block
if (no_of_bits >= 6) {
temp = no_of_bits - 6;
// binary of 63 is (111111) f
index = (val >> temp) & 63;
no_of_bits -= 6;
} else {
temp = 6 - no_of_bits;
// append zeros to right if bits are less than 6
index = (val << temp) & 63;
no_of_bits = 0;
}
res_str[k++] = char_set[index];
}
}
for (i = 1; i <= padding; i++) {
res_str[k++] = '=';
}
res_str[k] = '\0';
string a = res_str;
return a;
}
int main() {
string input_str = ":";
int len_str;
len_str = input_str.length();
string pwd = base64Encoder(input_str, len_str);
string mountpoint = "leedgps";
string header = "GET /" + mountpoint + " HTTP/1.0\r\n" + \
"User-Agent: NTRIP u-blox\r\n" + \
"Accept: */*\r\n" + \
"Authorization: Basic " + pwd + "\r\n" + \
"Connection: close\r\n\r\n";
struct hostent *h;
if ((h = gethostbyname("www.rtk2go.com")) == NULL) { // Lookup the hostname
cout << "cannot look up hostname" << endl;
}
struct sockaddr_in saddr;
int sockfd, connfd;
sockfd = socket(AF_INET, SOCK_STREAM, 0) < 0;
if (sockfd) {
printf("Error creating socket\n");
}
saddr.sin_family = AF_INET;
saddr.sin_port = htons(2101);
if(inet_pton(AF_INET, "3.23.52.207", &saddr.sin_addr)<=0) //
{
printf("\nInvalid address/ Address not supported \n");
return -1;
}
cout << connect(sockfd, (struct sockaddr *)&saddr, sizeof(saddr)) << endl;
return 0;
}
但是 connect 方法總是返回 -1(在 C++ 中)。 知道我在做什么錯嗎?
sockfd = socket(AF_INET, SOCK_STREAM, 0) < 0;
表示sockfd
為 0 或 1,這不是一個有效的套接字。
改為這樣做:
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0) {
printf("Error creating socket\n");
}
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