Question

I have a python method calling a c++ dll method, that contains printf().

typical call:

method ("something")

But now I have to be able to call something like

method("%x %y %z")

And it is crashing.

I have escaped the %, with a very simple

if msg:            
    msg = msg.replace( "%", "/%" )

and it seemed to work for the case where there was only one. (Don’t know exactly what effects it has on the text itself… )

So I tested with more than one, and I got a Debug Assertion Failure – Expression (“Incorrect format specifier”, 0).

Edit: After the accepted answer, the solution:

if msg:            
   msg = msg.replace( "%", "%%" )

Answer 1

The way to escape percent signs in sprintf() and the like is to double them (i.e. %%). But the code itself needs to be fixed by using "%s" as the first argument instead of the passed string.