CODEWITHSUNDEEP
c++iosxcodellvm
Joris
Joris

Reputation: 6305

Xcode 5 LLVM printf with %s format specifier not working in debug console

Here is the problem

I am reviving some old code (pre-ARC, Xcode 4, GDB) in Xcode 5 and while everything compiles and starts fine I have a problem with the output log of the debugger when printing the contents of a C++ string object.

#define DebugPrintf(args...) x_Printf(__FILE__,__LINE__,__PRETTY_FUNCTION__,args);

void x_Printf(const char *file, int lineNumber, const char *funcName, const char *format,...)
{
    va_list ap;

    va_start (ap, format);
    printf("%s (%s:%d)",funcName,file,lineNumber);
    printf(format,ap);
    va_end (ap);
}


void MyFunc() 
{
    string name;

    …

    DebugPrintf("Loaded entity %s\n",name.c_str());
}

Results in:

void MyFunc() (File.cpp:52)Loaded entity \373*
${\370\325\377\277:{\373*
Ģ\247\300\242\247`6*

However inspecting the name C++ string object shows me that it clearly contains "MainMenu" as content.

Anyone knows what's going on?

Upvotes: 0

Views: 730

Answers (1)

Bryan Chen
Bryan Chen

Reputation: 46598

You should use vprintf

void x_Printf(const char *file, int lineNumber, const char *funcName, const char *format,...)
{
    va_list ap;

    va_start (ap, format);
    printf("%s (%s:%d)",funcName,file,lineNumber);
    vprintf(format,ap); // <-- vprintf
    va_end (ap);
}

Upvotes: 2

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