On Wed, Jun 06, 2001 at 11:16:37PM +0200, Ignacio Nodal wrote:
> Sorry,there was a fault on the function I pasted ;))
>
> gboolean ParameterKernel::ReadPixmap(gchar **pixstring, GdkPixmap& pix)
> //Reads a pixmap from a xpm-format string & stores it in GdkPixmap& pix
> {
>
> GdkPixmap *pixmap;
> GdkBitmap *mask;
>
> pixmap = gdk_pixmap_colormap_create_from_xpm_d (NULL,
> gtk_widget_get_default_colormap(),
> &mask, NULL, (gchar **)
> pixstring);
>
>
>
> g_print("The program arrives this point\n");
> pix = *pixmap;
&pix must be a valid pointer, or this will segfault, just like if (char *)ptr is not a
valid pointer, *ptr = 'f' will segfault.
This means you're doing something wrong if..
> g_print("Segmentation fault is in the line above\n");
>
> if (&pix == NULL) {return (FALSE);} else {return (TRUE);}
..you're expecting &pix might be NULL here. I've forgotten everything I ever knew
about c++ but I don't think it can be NULL anyway.
Using GTK structures without any indirection is a bad idea, besides. I suspect what
you really wanted to do here is something like this, using a reference to a pointer:
gboolean ParameterKernel::ReadPixmap (gchar **pixstring, GdkPixmap*& pix)
{
GdkPixmap *pixmap;
GdkBitmap *mask;
pixmap = gdk_pixmap_colormap_create_from_xpm_d (NULL,
gtk_widget_get_default_colormap(), &mask, NULL, pixstring);
pix = pixmap;
if (pix == NULL)
return FALSE;
else
return TRUE;
}
Then you would use the function like this:
#include "myxpm.xpm" // declares char *myxpm[]
GdkPixmap *pixmap;
ParameterKernel::ReadPixmap (myxpm, pixmap);
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