rust 相关问题

<[u8; BUF_SIZE]>let mut buf: MaybeUninit<[u8; BUF_SIZE]> = MaybeUninit::uninit(); let buf: &mut [u8] = unsafe { &mut *buf.as_mut_ptr() }; let mut len = 0; loop { let n = stream.read(&mut buf[len..])?; len += n; // ... }

rust initialization maybeuninit transmute

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学习生锈 - 一生困扰

rust lifetime

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用目的地捕获信号

#include C中的DBU（Linux）程序在C中发送带有目的地的信号。代码如下： #include <stdio.h> #include <stdlib.h> #include <dbus/dbus.h> #include <unistd.h> /** * Connect to the DBUS bus and send a broadcast signal */ void sendsignal(DBusConnection* conn, char* sigvalue) { DBusMessage* msg; DBusMessageIter args; DBusError err; int ret; dbus_uint32_t serial = 0; printf("Sending signal with value %s\n", sigvalue); // create a signal & check for errors msg = dbus_message_new_signal("/test/signal/Object", // object name of the signal "test.signal.Type", // interface name of the signal "Test"); // name of the signal if (NULL == msg) { fprintf(stderr, "Message Null\n"); exit(1); } // set the destination of the signal dbus_message_set_destination(msg, "it.smartsecurity.dbus"); // append arguments onto signal dbus_message_iter_init_append(msg, &args); if (!dbus_message_iter_append_basic(&args, DBUS_TYPE_STRING, &sigvalue)) { fprintf(stderr, "Out Of Memory!\n"); exit(1); } // send the message and flush the connection if (!dbus_connection_send(conn, msg, &serial)) { fprintf(stderr, "Out Of Memory!\n"); exit(1); } dbus_connection_flush(conn); printf("Signal Sent\n"); // free the message and close the connection dbus_message_unref(msg); //dbus_connection_close(conn); } int main(int argc, char **argv) { DBusMessage* msg; DBusMessageIter args; DBusConnection* conn; DBusError err; int ret; // initialise the error value dbus_error_init(&err); // connect to the DBUS system bus, and check for errors conn = dbus_bus_get(DBUS_BUS_SYSTEM, &err); if (dbus_error_is_set(&err)) { fprintf(stderr, "Connection Error (%s)\n", err.message); dbus_error_free(&err); } if (NULL == conn) { exit(1); } // register our name on the bus, and check for errors ret = dbus_bus_request_name(conn, "it.smartsecurity.dbus", DBUS_NAME_FLAG_REPLACE_EXISTING , &err); if (dbus_error_is_set(&err)) { fprintf(stderr, "Name Error (%s)\n", err.message); dbus_error_free(&err); } if (DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER != ret) { exit(1); } do { sendsignal(conn, "CIAO"); sleep(1); } while (1); // dbus_connection_close(conn); return 0; } 然后用ZBUS板条箱写了Followng代码： use futures_util::stream::StreamExt; use zbus::{zvariant::OwnedObjectPath, proxy, Connection}; use zbus::zvariant::Value; #[proxy( default_service = "it.smartsecurity.dbus", default_path = "/test/signal/Object", interface = "test.signal.Type", )] trait Systemd1Manager { // Defines signature for D-Bus signal named `Test` #[zbus(signal)] fn test(&self, unit: String) -> zbus::Result<()>; // si deve chiamare come il segnale } async fn watch_systemd_jobs() -> zbus::Result<()> { let connection = Connection::system().await?; // `Systemd1ManagerProxy` is generated from `Systemd1Manager` trait let systemd_proxy = Systemd1ManagerProxy::builder(&connection) .destination("it.smartsecurity.dbus")? .path("/test/signal/Object")? .interface("test.signal.Type")? .build().await?; // Method `receive_job_new` is generated from `job_new` signal let mut new_jobs_stream = systemd_proxy.receive_test().await?; while let Some(msg) = new_jobs_stream.next().await { //dbg!(&msg); // struct `JobNewArgs` is generated from `job_new` signal function arguments let args = msg.args(); dbg!(&args); println!("====================="); // stampa il nome del servizio e il suo valore let x = msg.message().header(); let y = x.member(); if y.is_some() { println!("Header: {}", y.unwrap()); } dbg!(&y); let unit = args.unwrap().unit; println!("Param: {}", unit); } panic!("Stream ended unexpectedly"); } #[tokio::main] async fn main() { watch_systemd_jobs().await.unwrap(); } 我的问题是，此生锈代码不会捕获信号，我不明白我在做什么。当您将总线消息发送到特定目的地时，它们不再是广播（与您的代码注释相反） - 仅将其发送到该目的地。接收此类信号。在您的代码中，总线名称由发件人而不是接收器声明，因此发件人实际上将信号发送给本身。

c rust dbus

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zbus：用目的地捕获信号

c rust dbus

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可容易绑定（唯一的）SuperTrait？

是否可以拥有超级画像，但要遵守其自己的特定条款？例如，我有一个自定义的指针特质，我希望它能从中实现。但是，从in ...

rust

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