how to convert IP address in char[] to Uint32_t in c?

Question

I write a program which takes IP address as an argument and i wanted to store this IP address in the unit32_t. I can easily convert uint32_t to back to character array. How to convert IP address in Char Array to uint32_t.

For example

./IPtoCHAR 1079733050

uint32_t to IP Address => 64.91.107.58

But how to write a program that does the reverse task?

./CHARtoIP 64.91.107.58

for the first IPtoCHAR, it is

unsigned int ipAddress = atoi(argv[1]);

printf("IP Address %d.%d.%d.%d \n",((ipAddress >> 24) & 0xFF),((ipAddress >> 16) & 0xFF),((ipAddress >> 8) & 0xFF),(ipAddress & 0xFF));

But all these below does not work

uint32_t aa=(uint32_t)("64.91.107.58");

uint32_t aa=atoi("64.91.107.58");

uint32_t aa=strtol("64.91.107.58",NULL,10);

Some programmer dude · Accepted Answer · 2018-07-09 12:27:39Z

You use the inet_pton. function

And for the other way around you should have used inet_ntop.

For Windows-specific documentation, see inet_pton and inet_ntop.

Note that the functions can be used for both IPv4 and IPv6.

RS1980 · Accepted Answer · 2016-03-30 14:43:29Z

In case you don't have access to inet_* functions or need to code this yourself due to any other strange reason, you can use a function like this:

#include <stdio.h> /** * Convert human readable IPv4 address to UINT32 * @param pDottedQuad Input C string e.g. "192.168.0.1" * @param pIpAddr Output IP address as UINT32 * return 1 on success, else 0 */ int ipStringToNumber (const char* pDottedQuad, unsigned int * pIpAddr) { unsigned int byte3; unsigned int byte2; unsigned int byte1; unsigned int byte0; char dummyString[2]; /* The dummy string with specifier %1s searches for a non-whitespace char * after the last number. If it is found, the result of sscanf will be 5 * instead of 4, indicating an erroneous format of the ip-address. */ if (sscanf (pDottedQuad, "%u.%u.%u.%u%1s", &byte3, &byte2, &byte1, &byte0, dummyString) == 4) { if ( (byte3 < 256) && (byte2 < 256) && (byte1 < 256) && (byte0 < 256) ) { *pIpAddr = (byte3 << 24) + (byte2 << 16) + (byte1 << 8) + byte0; return 1; } } return 0; }

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