Thread: need help to modify my code, about using socket in windows to read web page.

Hi, Im new here, need a help.

this works:

Code:

char host[] = "www.google.com";
char *request = "GET / HTTP/1.0\r\nHost: www.google.com\r\nConnection: Close\r\n\r\n";
struct hostent *hp;                                       // will keep the same
hp = gethostbyname(host);                               // will keep the same
ret = send(sock, request, strlen(request), 0);          // will keep the same

both below 2 not working, who can make it work:

Code:

 char host[] = "news.google.com/nwshp?hl=en&tab=wn&authuser=0";
char *request = "GET / HTTP/1.0\r\nHost: news.google.com/nwshp?hl=en&tab=wn&authuser=0\r\n\r\n";

Code:

char host[] = "news.google.com";
char *request = "GET / HTTP/1.0\r\nHost: news.google.com/nwshp?hl=en&tab=wn&authuser=0\r\n\r\n";

Well welcome, but take into consideration that this forum has among other useful threads, a C and C++ one. Obviously you posted on the wrong one thread

These lines you say do not seem to have a problem by the way

Well in case you know about C++, how about using the C++ class string, instead of the C style string handling?

There is a ton of difference between C and C++, since you want to know.
C is a low-level language whose primary purpose is mostly to remain mean and lean while providing necessary features for low-level programming (which means it has to be very fast). That also means it lacks lots core features modern programming languages tend to have and its standard library is very slim; it lacks most data structures and algorithms, for example.
C++ is a high-level language that serves to offer the best of both worlds: the low-level approach of C (very fast speed and don't pay for what you don't use) and high-level language features and a huge standard library to provide flexible, fast and efficient programming for modern computers with no trade-off between features, speed and mean and lean (except that C++ compilers are extremely complicated software and the standard library has complexity and size to match).

Also, choosing the right forum for questions is not just for organizational purposes: it also serves to attract you the correct information you seek. C gurus who are not good at C++ do not necessarily check the C++ board and vice versa. Furthermore, even if C is a subset of C++, if you post C code in the C++ forum, you will be asked to correct it by transforming it into typical C++ code.
So yes, the category matters.

Originally Posted by Ming Darknss

Hi, Im new here, need a help.

this works:

Code:

char host[] = "www.google.com";
char *request = "GET / HTTP/1.0\r\nHost: www.google.com\r\nConnection: Close\r\n\r\n";
struct hostent *hp;                                       // will keep the same
hp = gethostbyname(host);                               // will keep the same
ret = send(sock, request, strlen(request), 0);          // will keep the same

both below 2 not working, who can make it work:

Code:

 char host[] = "news.google.com/nwshp?hl=en&tab=wn&authuser=0";
char *request = "GET / HTTP/1.0\r\nHost: news.google.com/nwshp?hl=en&tab=wn&authuser=0\r\n\r\n";

Code:

char host[] = "news.google.com";
char *request = "GET / HTTP/1.0\r\nHost: news.google.com/nwshp?hl=en&tab=wn&authuser=0\r\n\r\n";

Only saying "not working" does not make any sense to us.
What is the error you are getting with these two.. Whether it is a compilation error or run time error?? What is the error returned? Please specify and elaborate.

Originally Posted by Elkvis

then perhaps you should have posted in the network communication forum.

Agreed, this is not a C problem, and certainly not a C++ problem.
The problem exists not for the lack of C knowledge, but for the lack of the knowledge of the HTTP protocol, and possibly even how it specifically is used with the website you are interested in.

Originally Posted by Ming Darknss

both below 2 not working, who can make it work:

Code:

 char host[] = "news.google.com/nwshp?hl=en&tab=wn&authuser=0";
char *request = "GET / HTTP/1.0\r\nHost: news.google.com/nwshp?hl=en&tab=wn&authuser=0\r\n\r\n";

The other comments in the forum mentioned already that this question seems more to do with the specifics of network protocols rather than programming, but look carefully at your request to see if it actually makes sense semantically

GET / HTTP/1.0
Host: news.google.com/nwshp?hl?en&tab=wn&authuser=0

Is that actually a hostname? It looks to me like a hostname followed by a string of other characters. Maybe this is why your first example worked and your second one didn't.

To the larger issue, there are many details involved in handling these this type of communication reasonably. Why not use a library designed to do it properly. Libcurl is a popular example.