Download fil fra internettet

Jeg bruger forresten Borland CBuilder 6

Hilsen
Bentbit

jeg har postet den her kode nogle gange

get metoden bør kunne bruges i enhver Win32 compiler

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include <windows.h>
#include <errno.h>

void get(char *hostname,int port,char *path, char *fnm)
{
  FILE *fp;
  int sd,status,len,first,tmp;
  char cmd[512],resp[51200],*body;
  struct sockaddr local,remote;
  struct hostent *hostinfo;
  /* create socket */
  sd=socket(AF_INET,SOCK_STREAM,0);
  if(sd<0) {
      printf("Error creating socket: %s\n",strerror(errno));
      goto fin;
  }
  /* bind socket */
  local.sa_family=AF_INET;
  memset(local.sa_data,0,sizeof(local.sa_data));
  status=bind(sd,&local,sizeof(local));
  if(status<0) {
      printf("Error binding socket: %s\n",strerror(errno));
      goto fin;
  }
  /* lookup host */
  hostinfo=gethostbyname(hostname);
  if(!hostinfo) {
      printf("Error looking up host: %s\n",hostname);
      goto fin;
  }
  /* connect to host */
  remote.sa_family=hostinfo->h_addrtype;
  memcpy(remote.sa_data+2,hostinfo->h_addr_list[0],hostinfo->h_length);
  *((short *)remote.sa_data)=port;
  tmp=remote.sa_data[0];
  remote.sa_data[0]=remote.sa_data[1];
  remote.sa_data[1]=tmp;
  status=connect(sd,&remote,sizeof(remote));
  if(status!=0) {
      printf("Error connecting to host: %s port: %d\n",hostname,port);
      goto fin;
  }
  /* send GET request */
  sprintf(cmd,"GET %s HTTP/1.1\r\nHost: %s\r\nConnection: close\r\n\r\n",path,hostname);
  status=send(sd,cmd,strlen(cmd),0);
  if(status<0) {
      printf("Error sending GET request\n");
      goto fin;
  }
  /* read response */
  fp = fopen(fnm,"wb");
  first = 1;
  while ((len=recv(sd,resp,sizeof(resp),0))>0) {
      if(first) {
          body = strstr(resp,"\r\n\r\n") + 4;
          first = 0;
      } else {
          body = resp;
      }
      fwrite(body,len-(body-resp),1,fp);
  }
  fclose(fp);
fin:
  closesocket(sd);
  return;
}

int main(int argc,char *argv[])
{
  WSADATA WSAData;
  WSAStartup(0x0101,&WSAData);
  get("www.eksperten.dk",80,"/img/elogo.png","elogo.png");
  WSACleanup();
  return 0;
}

Hej Arne

Kan det passe, dit eksempel mangler #include <WINSOCK.H> ?

Hilsen
Nils

nej

den bliver inkluderet af windows.h

Hmm, får en del compiler fejl i CBuilder, bland andet disse :
[C++ Error] Unit1.cpp(28): E2450 Undefined structure 'sockaddr'
[C++ Error] Unit1.cpp(28): E2449 Size of 'remote' is unknown or zero
[C++ Error] Unit1.cpp(37): E2315 'sa_family' is not a member of 'sockaddr', because the type is not yet defined
[C++ Error] Unit1.cpp(51): E2315 'sa_family' is not a member of 'sockaddr', because the type is not yet defined

/Nils

inkluderer du windows.h ?

En anden kode til at hente et .jpg billede fra en internet side og gemme det i en fil.

#include <windows.h>
#include <wininet.h>
#include <iostream>
#include <stdio.h>

char Buffer[16*1024*1024];

int main()
{
  HINTERNET Internet = InternetOpen("My Url Browser", INTERNET_OPEN_TYPE_DIRECT, 0, 0, 0);
  if(!Internet)
  {
      std::cout << "Failed to open internet: " << GetLastError() << std::endl;
      return 1;
  }

  HINTERNET Url = InternetOpenUrl(Internet, "http://fjolletobak.com/downloadsnew/sub_14641.jpg", 0, 0, INTERNET_FLAG_RAW_DATA, 0);
  if(!Url)
  {
      std::cout << "Failed to open Url: " << GetLastError() << std::endl;
      return 2;
  }

  DWORD ReadLen = 0, CurrentPos = 0;
  do
  {
      InternetReadFile(Url, (void *)(Buffer + CurrentPos), sizeof(Buffer) - CurrentPos, &ReadLen);
      CurrentPos += ReadLen;
  }
  while(ReadLen);


  FILE *f = fopen("test.jpg", "wb");
  fwrite(Buffer, CurrentPos, 1, f);
  fclose(f);
  InternetCloseHandle(Url);
  InternetCloseHandle(Internet);
}

status ?

Hej Arne

Problemet blev løst af anden vej, men du skal selvfølgelig have dine point.
Men hvordan er det nu lige man gør edette ? - Er ikke ret stiv i den her portal :-)

Hilsen
Nils

jeg ligger et svar som du kan acceptere

Hej Arne

Tror tråden slutter her, hvis du har fået dine point ?

Hilsen
Nils

du skal markere mit navn ude i combo boxen så det bliver blåt inden du klikker accepter