Cast/Conversation

[Irish_GUI]

I have an IP Address in CString format i need it in the BYTE format below. //BYTE localIp[] = {127,0,0,1}; could anyone show me how to do this? Thanks

[David Crow]

CString str("127.0.0.1");
struct in_addr ia;
ia.S_addr = inet_addr(str);
// now look at the four members of ia.S_un_b

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"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

[Irish_GUI]

Hey, i am familar with that its a cstring to a byte[] im looking to do

[toxcct]

maybe a standard fonction does this (inet_addr() i think, but i don't remember), the folowing works fine, even if it can seem "heavy" :

#include <stdlib.h> // atoi()
#include <ctype.h> // isdigit()
#include <string.h> // strlen()

enum IPValidate {
IP_ERR = 0,
IP_OK = 1
};

int str2bytesIPAddr (char pcDestTab[], const char* pcIPAddr) {
// An IP address is between 0.0.0.0 and 255.255.255.255
int iCptCharIntoIPAddr = 0;
int iCptCharIntoByte = 0;
int iResult = IP_OK;
short sNbBytes = 0;
char pstrByte[16]; // To prevent argument size error
if (strlen(pcIPAddr) > 15) {// the max length of an IP address can't exceed 15 caracters
iResult = IP_ERR;
}
else {
do {
if (isdigit(pcIPAddr[iCptCharIntoIPAddr])) {
// A byte of an IP address mustn't begin with a '0', except if '0' is alone
if ((iCptCharIntoByte == 0) && (pcIPAddr[iCptCharIntoIPAddr] == '0') && (isdigit(pcIPAddr[iCptCharIntoIPAddr+1]))) {
iResult = IP_ERR;
}
else {
pstrByte[iCptCharIntoByte] = pcIPAddr[iCptCharIntoIPAddr];
iCptCharIntoIPAddr++;
iCptCharIntoByte++;
}
}
else {
if (pcIPAddr[iCptCharIntoIPAddr] == '.') {
// If we are at the end of a byte
pstrByte[iCptCharIntoByte] = '\0';
iCptCharIntoByte = 0;
iCp

[toxcct]

ooops, sory, i didn't see either it was a CString... (and i didn't see David's posts 'cause i was writing mine). well, by passing it to the function, just cast it before with the (LPCTSTR) operator defined in CString.

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TOXCCT >>> GEII power

[Irish_GUI]

cheers guys tis working struct in_addr ia; ia.s_addr = inet_addr(strAdapterInfo); BYTE localIp[3]; localIp[0] = ia.S_un.S_un_b.s_b1; localIp[1] = ia.S_un.S_un_b.s_b2; localIp[2] = ia.S_un.S_un_b.s_b3; localIp[3] = ia.S_un.S_un_b.s_b4; Thanks again

[Anonymous]

Hi I Hope this will work 1. CString str = "127,0,0,1"; int length = str .GetLength(); BYTE localIp[length] ; memcpy(localIp,str,length); or do it for(int i = 0;i

[toxcct]

ah ah ahh, do you just know what is an IP ? what you are suggesting will do so : ['1', '2', '7', '.', '0', '.', '.', '1'] that's not what we want. a coded IP Address is coded on 4 bytes, which represent each blocks of values. it will be either : [0x7F, 0x00, 0x00, 0x01].

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TOXCCT >>> GEII power

[toxcct]

i forgot to say (if it was interresting you) that it was previously a isIPAddr() that i added two lines (twice the following : pcDestTab[sNbBytes] = atoi(pstrByte);). i hope that can be helpful to understand the way an IP Address is analysed, and so on.

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TOXCCT >>> GEII power