Thread: Download code

Originally Posted by maxorator

4 C:\Programs\Dev-Cpp\Templates\main6.cpp `main' must return `int'

main must start with int, and return a int,
the following is a example on how main should be declared.

Code:

int main()
{

     return 0;
}

for some applications you may need

INT WINAPI MAIN()

or

int WINAPI MAIN()


either way it shoudl start with int and return int.

that will get rid of that error.

for your other error your not linking to something correctly
your prolyl doing a consoel application when you should
be picking a windows application on devc++.

The example there showed

Code:

#include <stdio.h>
#include "winsock2.h"

void main() {
  return;
}

doesnt mean there right...

main always returns and int.

you dont have a a choice in the matter.

i noticed alot of code sample on msdn,
use void main(), but maybe its C related,
i dont know all the querks of C, but
for c++, since you are using a c++ compiler,
main returns int. no if's and's or but's

And this is their "complete" code:

Code:

#include <stdio.h>
#include "winsock2.h"

void main() {

    // Initialize Winsock.
    WSADATA wsaData;
    int iResult = WSAStartup( MAKEWORD(2,2), &wsaData );
    if ( iResult != NO_ERROR )
        printf("Error at WSAStartup()\n");

    // Create a socket.
    SOCKET m_socket;
    m_socket = socket( AF_INET, SOCK_STREAM, IPPROTO_TCP );

    if ( m_socket == INVALID_SOCKET ) {
        printf( "Error at socket(): %ld\n", WSAGetLastError() );
        WSACleanup();
        return;
    }

    // Connect to a server.
    sockaddr_in clientService;

    clientService.sin_family = AF_INET;
    clientService.sin_addr.s_addr = inet_addr( "127.0.0.1" );
    clientService.sin_port = htons( 27015 );

    if ( connect( m_socket, (SOCKADDR*) &clientService, sizeof(clientService) ) == SOCKET_ERROR) {
        printf( "Failed to connect.\n" );
        WSACleanup();
        return;
    }

    // Send and receive data.
    int bytesSent;
    int bytesRecv = SOCKET_ERROR;
    char sendbuf[32] = "Client: Sending data.";
    char recvbuf[32] = "";

    bytesSent = send( m_socket, sendbuf, strlen(sendbuf), 0 );
    printf( "Bytes Sent: %ld\n", bytesSent );

    while( bytesRecv == SOCKET_ERROR ) {
        bytesRecv = recv( m_socket, recvbuf, 32, 0 );
        if ( bytesRecv == 0 || bytesRecv == WSAECONNRESET ) {
            printf( "Connection Closed.\n");
            break;
        }
        if (bytesRecv < 0)
            return;
        printf( "Bytes Recv: %ld\n", bytesRecv );
    }

    return;
}

changing it to int main(), and return 0;

will not affect your program in anyway, quit
acting like its life or death make the change and move on.

Originally Posted by nvoigt

If all you want to do is download files clean and simple, the solution was already given in the third post.

Code:

URLDownloadToFile( NULL, "http://www.google.com/intl/en_us/images/logo.gif", "c:\\google_logo.jpg", 0, NULL );

Check what headers and libs you need at the link given by Tonto. Make sure you check return values.

Maybe socket programming is a bit over your head just now and all you need is this simplified functionality.

What header file do I need for that?

Ok, at last I found something that really works fine: http://www.whyaskwhy.org/programming....winh.cpp.html

I'm so glad you found a nice copy and paste example instead of reading the ample documentation we provided.

I cant use the ample documentation you provided because I dont have urlmon.h file! This is the only thing that works without urlmon.h.

out of curiosity how do you know you dont have it?
what compiler are you using?

Dev-c++

This thread is SOLVED!!! Someone's got problems understanding it