如何在 C++ 中将 unsigned char[] 打印为 HEX？
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How to print unsigned char[] as HEX in C++?
提问by louis.luo
I would like to print the following hashed data. How should I do it?
我想打印以下散列数据。我该怎么做？
unsigned char hashedChars[32];
SHA256((const unsigned char*)data.c_str(),
data.length(),
hashedChars);
printf("hashedChars: %X\n", hashedChars); // doesn't seem to work??
回答by JaredPar
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 charvalues individually as hex values.
十六进制格式说明符需要一个整数值，但您提供的是一个char. 您需要做的是将char值单独打印为十六进制值。
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 coutinstead of printf(it's more idiomatic for C++.
由于您使用的是 C++，但您应该考虑使用cout而不是printf（它更符合 C++ 的习惯。
cout << "hashedChars: ";
for (int i = 0; i < 32; i++) {
cout << hex << hashedChars[i];
}
cout << endl;
