检查对象是否是布尔值
[英]Check if object is a boolean
I need to check if my Json.Object is a boolean or not. This is what I've done:
我需要检查我的Json.Object是否是布尔值。这就是我所做的:
var media = root.get_member ("media");
if (!media.get_value_type ().is_a (bool)) {
this.media.set ("mp4", media.get_object ().get_string_member ("mp4"));
this.media.set ("webm", media.get_object ().get_string_member ("webm"));
}
The JSON looks like this:
JSON看起来像这样:
"media": {
"mp4": "http:\/\/img-9gag-fun.9cache.com\/photo\/EyVtjpq_460sv.mp4",
"webm": "http:\/\/img-9gag-fun.9cache.com\/photo\/EyVtjpq_460svwm.webm"
},
Or like this if it's a boolean:
或者像这样,如果它是布尔值:
"media": false,
But this condition is not working !media.get_value_type ().is_a (bool), the method is_a () can't take bool apparently. How can I check if my value is a boolean or not?
但是这个条件不起作用!media.get_value_type()。is_a(bool),方法is_a()显然不能拿bool。如何检查我的值是否为布尔值?
1 个解决方案
#1
1
Should be this:
应该是这样的:
if (media.get_value_type () != typeof(bool))
You can use typeof () to get the GType of any data type in Vala and GType is what the function returns.
您可以使用typeof()来获取Vala中任何数据类型的GType,GType就是函数返回的内容。
https://wiki.gnome.org/Projects/Vala/FAQ#How_do_I_get_the_GType_for_something.3F
https://developer.gnome.org/json-glib/stable/json-glib-JSON-Node.html#json-node-get-value-type
In C you would probably use G_TYPE_BOOLEAN:
在C中你可能会使用G_TYPE_BOOLEAN:
https://developer.gnome.org/gobject/stable/gobject-Type-Information.html#G-TYPE-BOOLEAN:CAPS
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