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How to convert string contain Hex data into integer

asifjavaid asifjavaid is offline
Junior Member
Join Date: Sep 2008
Posts: 1
hi all,

I want to convert a string contain hex format '0x15' and what to convert it integer because i want to write data contain by a integer variable in hex format (binary data) into the file.

here is my code

char * str = "0x15";
int value;

FILE FILE *fptrSample = fopen("e:\\sample.txt","rb+");
if (fptrSample)
value = atoi(str);// error : - here "str" contains hex data and want output value = 0x15 in integer but value = 0


after executing this
output is
value = 0

where as i want to the correct output
value = 0x15 so that this binary data will be written in file

can any one help me?.................
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