Demarshals a value from a string.
This function calls Value on the value argument, so it need not be initialised
beforehand.
Can handle char, uchar, boolean, int, uint, long, ulong, enum, flags, float, double, string, `GdkRGBA` and `GtkAdjustment` type values.
Upon errors false will be returned and throws will be assigned a `GError` from the gtk_builder_error domain.
| this |
a `GtkBuilder` |
| pspec |
the `GParamSpec` for the property |
| value |
the `GValue` to store the result in |
| string |
the string representation of the value |
|
true on success |