How to print unsigned char[] as HEX in C++?
50,377
Solution 1
The hex format specifier is expecting a single integer value but you're providing instead an array of char
. What you need to do is print out the char
values individually as hex values.
printf("hashedChars: ");
for (int i = 0; i < 32; i++) {
printf("%x", hashedChars[i]);
}
printf("\n");
Since you are using C++ though you should consider using cout
instead of printf
(it's more idiomatic for C++.
cout << "hashedChars: ";
for (int i = 0; i < 32; i++) {
cout << hex << hashedChars[i];
}
cout << endl;
Solution 2
In C++
#include <iostream>
#include <iomanip>
unsigned char buf0[] = {4, 85, 250, 206};
for (int i = 0;i < sizeof buf0 / sizeof buf0[0]; i++) {
std::cout << std::setfill('0')
<< std::setw(2)
<< std::uppercase
<< std::hex << (0xFF & buf0[i]) << " ";
}
Author by
louis.luo
Updated on July 11, 2022Comments
-
louis.luo almost 2 years
I would like to print the following hashed data. How should I do it?
unsigned char hashedChars[32]; SHA256((const unsigned char*)data.c_str(), data.length(), hashedChars); printf("hashedChars: %X\n", hashedChars); // doesn't seem to work??