我在以下代码中收到上述警告:
[DBus (name = "example.Hello")]
public class HelloDbusServer : Object {
private bool is_test = false;
public HelloDbusServer.test() {
is_test = true;
}
[DBus (name = "sayHello")]
public string say_hello() {
if (is_test) {
return "hello (test)";
}
return "hello";
}
}
void on_bus_aquired(DBusConnection conn) {
try {
conn.register_object ("/example/Hello", new HelloDbusServer());
} catch (IOError e) {
stderr.printf ("Could not register dbus service!\n");
Posix.exit(1);
}
}
void on_bus_aquired_test(DBusConnection conn) {
try {
conn.register_object ("/example/Hello", new HelloDbusServer.test());
} catch (IOError e) {
stderr.printf ("Could not register dbus service!\n");
Posix.exit(1);
}
}
void on_bus_name_lost(DBusConnection conn) {
stderr.printf ("Could not aquire dbus name!\n");
Posix.exit(2);
}
void main (string[] args) {
BusType bt = BusType.SYSTEM;
BusAcquiredCallback cb = on_bus_aquired;
if ((args.length > 1) && (args[1] == "test"))
{
bt = BusType.SESSION;
cb = on_bus_aquired_test;
stderr.printf ("Running in test mode on session bus.\n");
}
Bus.own_name (bt, "example.Hello", BusNameOwnerFlags.NONE,
cb,
() => {},
on_bus_name_lost);
new MainLoop().run();
}
在方法调用“Bus.own_name (bt, "example.Hello", BusNameOwnerFlags.NONE, cb, () => {}, on_bus_name_lost)" 处会弹出变量“cb”的警告。
我已经搜索了一个解决方案,并尝试了各种具有“拥有”和闭包的东西,如网络中的一些技巧中提到的,但我没有设法解决这个问题。
谢谢你的帮助。
谢谢你的答案#1。我已经尝试了这两种解决方案。
使用“(拥有)”我得到了这个警告:
/.../helloFromDBus.vala.c: In function ‘_vala_main’:
/.../helloFromDBus.vala.c:402:2: warning: passing argument 3 of ‘g_cclosure_new’ from incompatible pointer type [enabled by default]
/usr/include/glib-2.0/gobject/gclosure.h:206:11: note: expected ‘GClosureNotify’ but argument is of type ‘GDestroyNotify’
我真的不明白这个警告。尝试修复“on_bus_aquired...”方法的签名以符合“BusAcquiredCallback”委托。我添加了“字符串名称”作为第二个参数。然后我得到了与上面相同的警告。
使用 "(con) => { cb (con); }" 会导致错误:
helloFromDBus.vala:50.18-50.25: error: Too few arguments, method `GLib.BusAcquiredCallback' does not take 1 arguments
(con) => { cb (con); },
如上所述修复签名并使用 "(con, name) => { cb (con, name); }" 给出以下警告:
/.../helloFromDBus.vala.c: In function ‘_vala_main’:
/.../helloFromDBus.vala.c:448:2: warning: passing argument 3 of ‘g_cclosure_new’ from incompatible pointer type [enabled by default]
/usr/include/glib-2.0/gobject/gclosure.h:206:11: note: expected ‘GClosureNotify’ but argument is of type ‘void (*)(void *)’
我也没有真正理解这个警告。
任何帮助解决这些警告?