Re: [ft] FT_* error messages

[Stefano Sabatini]

On date Saturday 2009-01-10 21:03:57 +0100, Werner LEMBERG wrote:
> 
> > fterrid.h contains a list of error messages defines [...]
> 
> fterrid.h is from FreeType 1; this is no longer supported.
> 
> > and FT_* functions return such error messages, but doesn't seem to
> > be a way to convert these error codes in corresponding strings to be
> > delivered to the user rather than the error code itself.
> 
> FreeType 2 has such a mechanism; look into fterrors.h.

Yes, it's quite weird but works fine anyway, follows an usage example
for the archive:

---------------------------------------8<---------------------------------
#include <stdio.h>
#include <string.h>

#include <ft2build.h>
#include FT_FREETYPE_H

/* build error strings table */
#define FT_ERROR_START_LIST     {
#define FT_ERRORDEF( e, v, s )  { e, s },
#define FT_ERROR_END_LIST       { 0, 0 } };

#undef __FTERRORS_H__
const struct
{
    int          code;
    const char*  msg;
} ft_errors[] =
#include FT_ERRORS_H

int main(int argc, char**  argv)
{
    FT_Library    library;
    FT_Face       face;
    FT_Error      error;

    const char* face_filename;

    if (argc != 2) {
        fprintf (stderr, "usage: %s <face-filename>\n", argv[0]);
        exit(1);
    }
    face_filename = argv[1];

    /* initialize library */
    if ((error = FT_Init_FreeType(&library))) {
        fprintf(stderr, "Impossible to init the FT library: %s\n", 
ft_errors[error].msg);
        exit(1);
    }

    /* create font face object */
    if ((error = FT_New_Face(library, face_filename, 0, &face))) {
        fprintf(stderr, "Impossible to load face file '%s': %s\n", 
face_filename, ft_errors[error].msg);
        exit(1);
    }

    exit(0);
}
---------------------------------------8<---------------------------------

Thanks, regards.