Sending buffered Image over UDP in C++

Question

I have adapted this block of code from answer post here which save image into buffer.Now i want to send this buffer through UDP packet.I am confused about how to use sendto() function in socket.I appreciate any help you can provide.

{
    IStream *pStream = NULL;
    LARGE_INTEGER liZero = {};
    ULARGE_INTEGER pos = {};
    STATSTG stg = {};
    ULONG bytesRead=0;
    HRESULT hrRet=S_OK;

    BYTE* buffer = NULL;  // this is your buffer that will hold the jpeg bytes
    DWORD dwBufferSize = 0;  // this is the size of that buffer;


    hrRet = CreateStreamOnHGlobal(NULL, TRUE, &pStream);
    //hrRet = pScreenShot->Save(pStream, &imageCLSID, &encoderParams) == 0 ? S_OK : E_FAIL;
    bitmap.Save(pStream, &clsid, &encoderParameters);
    hrRet = pStream->Seek(liZero, STREAM_SEEK_SET, &pos);
    hrRet = pStream->Stat(&stg, STATFLAG_NONAME);

    // allocate a byte buffer big enough to hold the jpeg stream in memory
    buffer = new BYTE[stg.cbSize.LowPart];
    hrRet = (buffer == NULL) ? E_OUTOFMEMORY : S_OK;
    dwBufferSize = stg.cbSize.LowPart;

    // copy the stream into memory
    hrRet = pStream->Read(buffer, stg.cbSize.LowPart, &bytesRead);

    // now go save "buffer" and "dwBufferSize" off somewhere.  This is the jpeg buffer
    // don't forget to free it when you are done

    // After success or if any of the above calls fail, don't forget to release the stream
    if (pStream)
    {
        pStream->Release();
    }
}

Answer 1

Please find below code to send data via UDP using sendto() you just need to add your code for reading image and store it in buffer(I already mention in below code where to add your code).And please not i write this code in c so at your side you need some conversation from c to c++.

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h> 
#include <sys/time.h>

#define REMOTE_SERVER_PORT 1501
#define MAX_MSG 100


int main(int argc, char *argv[]) {

  int sd, rc, i;
  struct sockaddr_in cliAddr, remoteServAddr;
  struct hostent *h;
  FILE* filein;
 long lSize;
 char *buffer;

  /* get server IP address (no check if input is IP address or DNS name */
  h = gethostbyname(argv[1]);
  if(h==NULL) {
    printf("%s: unknown host '%s' \n", argv[0], argv[1]);
    exit(1);
  }

  printf("%s: sending data to '%s' (IP : %s) \n", argv[0], h->h_name,
     inet_ntoa(*(struct in_addr *)h->h_addr_list[0]));

  remoteServAddr.sin_family = h->h_addrtype;
  memcpy((char *) &remoteServAddr.sin_addr.s_addr, 
     h->h_addr_list[0], h->h_length);
  remoteServAddr.sin_port = htons(REMOTE_SERVER_PORT);

  /* socket creation */
  sd = socket(AF_INET,SOCK_DGRAM,0);
  if(sd<0) {
    printf("%s: cannot open socket \n",argv[0]);
    exit(1);
  }

  /* bind any port */
  cliAddr.sin_family = AF_INET;
  cliAddr.sin_addr.s_addr = htonl(INADDR_ANY);
  cliAddr.sin_port = htons(0);

  rc = bind(sd, (struct sockaddr *) &cliAddr, sizeof(cliAddr));
  if(rc<0) {
    printf("%s: cannot bind port\n", argv[0]);
    exit(1);
  }

 //please put Here your code to read image and store it in buffer    


  // send data 

    rc = sendto(sd, buffer, sizeof(buffer)+1, 0, 
        (struct sockaddr *) &remoteServAddr, 
        sizeof(remoteServAddr));

    if(rc<0) {
      printf("%s: cannot send data %d \n",argv[0],i-1);
      close(sd);
      exit(1);
    }

  return 1;

}