C / C++ / MFC

typdef struct _double_array
{
double array[9];
int nCount;
} DOUBLE_ARRAY, *LPDOUBLE_ARRAY;

int i = 0;

float stackArray[5];
i = sizeof(stackArray) / sizeof(stackArray[0]);	// i is 5
// sizeof(stackArray) will return (5 * sizeof(float))
// sizeof(stackArray[0]) will return sizeof(float)

float* heapArray = new float[5];
i = sizeof(heapArray) / sizeof(heapArray[0]);	// i is 1
// sizeof(heapArray) will return sizeof(float*)
// sizeof(heapArray[0]) will return sizeof(float)

// Interesting Note (forget bounds errors here)
int myFunction(float* myArray)
{
	return sizeof(myArray) / sizeof(myArray[0]);
}
// above function will return heap results regardless of where
// the float array is actually allocated (that is, always 1)

Veeresh Hiremath wrote:

pops up an MDI child window

char szPath[255];
if(SUCCEEDED(SHGetSpecialFolderPath(NULL,szPath,CSIDL_FAVORITES, 0))) 
{
     MessageBox(szPath);
}

GetWindowsDirectory()<br />
<pre>	char cBuf[255];
	GetWindowsDirectory(cBuf,255);
	MessageBox(cBuf); </pre> <br />
This will give you the path to windows directory however. <br />
<br />
<div class="ForumSig"><font face="Verdana" color="Crimson" size="1.4">Nobody can give you wiser advice than yourself. - Cicero</font></div>

struct hostent *lphe;
lphe = gethostbyname("mylinux");
if (!lphe) {
 //no active interface or dns unavailable?
} else {
 printf("Computer name is : %s\nIts IP address is: %s", lphe->h_name, inet_ntoa(lphe->h_addr));
}

Galatei wrote:

lphe = gethostbyname("mylinux");

Galatei wrote:

inet_ntoa(lphe->h_addr)

Aniket Salunkhe wrote:

How / From where I can get this name ("mylinux")?

#include <unistd.h>
#include <limits.h>

  char name[HOST_NAME_MAX+1];
  int result;

  result=gethostname(name, HOST_NAME_MAX+1);

Aniket Salunkhe wrote:

name ("mylinux")?

printf("HOSTNAME: %s\n", getenv("HOSTNAME"));

#include <sys/socket.h>
#include <sys/types.h>
#include <netdb.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>

int getifaddr(char *pifname, struct sockaddr_in* psai)
{
    int s;		// socket descriptor
    struct ifreq ifr;	// interface request structure, for SIOCGIFADDR
    struct sockaddr_in *saitmp = (struct sockaddr_in*)&ifr.ifr_addr;
    // open socket
    if (!pifname || !psai)
	return -1;
    s = socket(AF_INET, SOCK_STREAM, 0);
    if (s < 0)
	return -2;	// socket creation error
    memset(&ifr, 0, sizeof(ifr));
    strcpy(ifr.ifr_name, pifname);
    saitmp->sin_family = AF_INET;
    if (ioctl(s, SIOCGIFADDR, &ifr) != 0)
	return -3;
    memcpy(psai, saitmp, sizeof(struct sockaddr_in));
    return 0;
}

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

int main(void)
{
    struct sockaddr_in sai;
    if (!getifaddr("eth0", &sai))
        printf("IP: %s\n", inet_ntoa(sai.sin_addr));
    else
	perror("getifaddr error!\n");
}