// Returns all metadata keys from the currently loaded image.
func (self *Canvas) Metadata() map[string]string {
var n C.size_t
var i C.size_t
var value *C.char
var key *C.char
data := make(map[string]string)
cplist := C.CString("*")
properties := C.MagickGetImageProperties(self.wand, cplist, &n)
C.free(unsafe.Pointer(cplist))
for i = 0; i < n; i++ {
key = C.MagickGetPropertyName(properties, C.size_t(i))
value = C.MagickGetImageProperty(self.wand, key)
data[strings.Trim(C.GoString(key), " ")] = strings.Trim(C.GoString(value), " ")
C.MagickRelinquishMemory(unsafe.Pointer(value))
C.MagickRelinquishMemory(unsafe.Pointer(key))
}
return data
}
// Returns all the property names that match the specified pattern associated
// with a wand. Use GetImageProperty() to return the value of a particular
// property.
func (mw *MagickWand) GetImageProperties(pattern string) (properties []string) {
cspattern := C.CString(pattern)
defer C.free(unsafe.Pointer(cspattern))
np := C.size_t(0)
ps := C.MagickGetImageProperties(mw.mw, cspattern, &np)
properties = sizedCStringArrayToStringSlice(ps, np)
return
}