How do I represent a hex value in a python string?

Question

I have some code in C that expects char buffer that looks like this:

 char buf[ 64 ];
    buf[0] = 0x01;
    buf[1] = 0x11;
    buf[2] = 0x61;
    buf[3] = 0x08;
    buf[4] = 0x01;

I am trying to create this buffer in Python, and pass the pointer to the C code. I created buf as follows,

buf = create_string_buffer('0x01 0x11 0x61 0x08 0x01', 64)

but when I pass the pointer to my C code, it looks like the C code is reading the ASCII code for 01, not a hex literal.

How do I fix this?

Asked By: usustarr

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Answer 1

In Python hex literals are escaped by x

so in your case the string to pass into your c function would be written as

'x01x11x61x08x01'

There is a table here in the python2 docs listing the escape sequences that python understands (corresponding link for python3).

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