Experiments with various wxString formatting options (background: investigating ThrowIOError formatting problems in pcbnew/*specctra* files)

format-test.cpp

/* simplification to narrow down the format problems */
/*
 * Compiled and run (you might need to adapt include directories)

g++ -Wall -o format-test -isystem /usr/lib/x86_64-linux-gnu/wx/include/gtk2-unicode-3.0 -isystem /usr/include/wx-3.0 -D__WXGTK__ format-test.cpp -L/usr/lib/x86_64-linux-gnu/ -lwx_baseu-3.0 && ./format-test

*/

#include <stdio.h>
#include <wx/string.h>

// Macros from macros.h
static inline const wxChar* GetChars( const wxString& s ) {
    return (const wxChar*) s.c_str();
}

#define TO_UTF8( wxstring )  ( (const char*) (wxstring).utf8_str() )

// Method to test:
void FormattedPrint(const char* what, const wxString& fmt, ... ) {
    wxString result;
    va_list     args;

    va_start( args, fmt );
    result.PrintfV( fmt, args );
    va_end( args );

    printf("%s: '%s'\n", what, TO_UTF8(result));
}

int main() {
    wxString fmt = wxString::FromUTF8("this is a test >%s<");
    wxString value = wxString::FromUTF8("SomeTest value");

    printf("Input: format:'%s' and value:'%s'\n", TO_UTF8(fmt), TO_UTF8(value));
    printf("sizeof(wxChar) = %zd\n", sizeof(wxChar));

    FormattedPrint("wxstring::PrintfV(fmt, GetChars())  ", fmt, GetChars(value));
    FormattedPrint("wxstring::PrintfV(fmt, value.GetData())  ", fmt, value.GetData());
    FormattedPrint("wxstring::PrintfV(fmt, TO_UTF8())   ", fmt, TO_UTF8(value));

    // Same test with wxString::Printf
    wxString out;
    out.Printf(fmt, value);
    printf("wxstring::Printf(fmt, wxstring)     : '%s'\n", TO_UTF8(out));

    out.Printf(fmt, GetChars(value));
    printf("wxstring::Printf(fmt, GetChars(...)): '%s'\n", TO_UTF8(out));

    out.Printf(fmt, TO_UTF8(value));
    printf("wxstring::Printf(fmt, TO_UTF8(..))  : '%s'\n", TO_UTF8(out));
}

output.txt

$ g++ -Wall -o format-test -isystem /usr/lib/x86_64-linux-gnu/wx/include/gtk2-unicode-3.0 -isystem /usr/include/wx-3.0 -D__WXGTK__ format-test.cpp -L/usr/lib/x86_64-linux-gnu/ -lwx_baseu-3.0 && ./format-test
Input: format:'this is a test >%s<' and value:'SomeTest value'
sizeof(wxChar) = 4
wxstring::PrintfV(fmt, GetChars())  : 'this is a test >S<'
wxstring::PrintfV(fmt, value.GetData())  : 'this is a test >'
wxstring::PrintfV(fmt, TO_UTF8())   : 'this is a test >SomeTest value<'
wxstring::Printf(fmt, wxstring)     : 'this is a test >SomeTest value<'
wxstring::Printf(fmt, GetChars(...)): 'this is a test >SomeTest value<'
wxstring::Printf(fmt, TO_UTF8(..))  : 'this is a test >SomeTest value<'