Method
VipsImageget
Declaration [src]
int
vips_image_get (
const VipsImage* image,
const char* name,
GValue* value_copy
)
Description [src]
Fill value_copy with a copy of the header field. value_copy must be zeroed
but uninitialised.
This will return -1 and add a message to the error buffer if the field
does not exist. Use vips_image_get_typeof() to test for the
existence of a field first if you are not certain it will be there.
For example, to read a double from an image (though of course you would use
vips_image_get_double() in practice):
GValue value = G_VALUE_INIT;
double d;
if (vips_image_get(image, name, &value))
return -1;
if (G_VALUE_TYPE(&value) != G_TYPE_DOUBLE) {
vips_error("mydomain",
_("field \"%s\" is of type %s, not double"),
name,
g_type_name(G_VALUE_TYPE(&value)));
g_value_unset(&value);
return -1;
}
d = g_value_get_double(&value);
g_value_unset(&value);
::: seealso
vips_image_get_typeof(), vips_image_get_double().