CODEWITHSUNDEEP
cmacrosc-preprocessor
user265483
user265483

Reputation: 11

How to correctly define char array

Does anyone know how should ASF_OBJECT_GUID_TEST be defined to avoid compilation error in the line marked below, or where I can find more information about it?

#define ASF_OBJECT_GUID_TEST {(char)0x75, (char)0xB2, (char)0x00}

void testFunction(char * testChar)
{

}

int main(int argc, char * argv[])
{
   char test[] = ASF_OBJECT_GUID_TEST;

   testFunction(test);
   testFunction(ASF_OBJECT_GUID_TEST); // <- fails to compile this line of code

   return 0;
}

Upvotes: 1

Views: 3395

Answers (3)

user265483
user265483

Reputation: 11

Thanks. That was exactly what I was looking for.

Supposed I have defined many string literals which have 8 characters, and each 2 of them make actually the value of a byte. Is there a way to create a macro that would modify those string literals by adding a "\x" between every couple of characters like the following?

#define TEST SOME_MACRO("33698149")

Where TEST would be "\x33\x69\x81\x49"

Upvotes: 0

jamesdlin
jamesdlin

Reputation: 89985

{(char)0x75, (char)0xB2, (char)0x00}

is an initializer list and is not itself an array (or a pointer) in C89.

You instead could use:

#define ASF_OBJECT_GUID_TEST "\x75\xB2"

Upvotes: 2

Seadog
Seadog

Reputation: 41

you want to cast the ASF_OBJECT_GUID_TEST, i.e

testFunction((char[])ASF_OBJECT_GUID_TEST)

or

#define ASF_OBJECT_GUID_TEST (char[]){(char)...}

Upvotes: 1

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