php调用C程序
树莓派2，开发nginx + php + sqlite，现在php和C语言的程序都写好了，C程序写的是串口通信，但是用exec调用返回是空，但是如果调用helloworld却可以调用，请问这是为什么？
回复讨论(解决方案)
php 的 exec 接受的是外部程序的标准输出
那应该用什么调用呢，system，exec，passthru都不行，本人初写，求教
关键是你的 c 程序是如何向 php 返回数据的
关键是你的 c 程序是如何向 php 返回数据的
我C程序是串口发指定信息，返回信息写入sqlite的数据库，然后php查询数据库
问题知道了，是php调用C程序时，串口打开失败，但单独运行C程序是可以的，不知道为什么
那exec调用返回是不是空有什么关系？
你查表得数据不就行了？
那exec调用返回是不是空有什么关系？
你查表得数据不就行了？
现在是串口不能open，nFd = open("/dev/ttyAMA0", O_RDWR|O_NOCTTY);这个返回-1,。
你那是 c 的问题，不是 php 的问题
你得去 c/c++ 找专家
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
11 Best PHP URL Shortener Scripts (Free and Premium)
Mar 03, 2025 am 10:49 AM
Long URLs, often cluttered with keywords and tracking parameters, can deter visitors. A URL shortening script offers a solution, creating concise links ideal for social media and other platforms. These scripts are valuable for individual websites a
Working with Flash Session Data in Laravel
Mar 12, 2025 pm 05:08 PM
Laravel simplifies handling temporary session data using its intuitive flash methods. This is perfect for displaying brief messages, alerts, or notifications within your application. Data persists only for the subsequent request by default: $request-
Build a React App With a Laravel Back End: Part 2, React
Mar 04, 2025 am 09:33 AM
This is the second and final part of the series on building a React application with a Laravel back-end. In the first part of the series, we created a RESTful API using Laravel for a basic product-listing application. In this tutorial, we will be dev
Simplified HTTP Response Mocking in Laravel Tests
Mar 12, 2025 pm 05:09 PM
Laravel provides concise HTTP response simulation syntax, simplifying HTTP interaction testing. This approach significantly reduces code redundancy while making your test simulation more intuitive. The basic implementation provides a variety of response type shortcuts: use Illuminate\Support\Facades\Http; Http::fake([ 'google.com' => 'Hello World', 'github.com' => ['foo' => 'bar'], 'forge.laravel.com' =>
cURL in PHP: How to Use the PHP cURL Extension in REST APIs
Mar 14, 2025 am 11:42 AM
The PHP Client URL (cURL) extension is a powerful tool for developers, enabling seamless interaction with remote servers and REST APIs. By leveraging libcurl, a well-respected multi-protocol file transfer library, PHP cURL facilitates efficient execution of various network protocols, including HTTP, HTTPS, and FTP. This extension offers granular control over HTTP requests, supports multiple concurrent operations, and provides built-in security features.
12 Best PHP Chat Scripts on CodeCanyon
Mar 13, 2025 pm 12:08 PM
Do you want to provide real-time, instant solutions to your customers' most pressing problems? Live chat lets you have real-time conversations with customers and resolve their problems instantly. It allows you to provide faster service to your custom
Announcement of 2025 PHP Situation Survey
Mar 03, 2025 pm 04:20 PM
The 2025 PHP Landscape Survey investigates current PHP development trends. It explores framework usage, deployment methods, and challenges, aiming to provide insights for developers and businesses. The survey anticipates growth in modern PHP versio
Notifications in Laravel
Mar 04, 2025 am 09:22 AM
In this article, we're going to explore the notification system in the Laravel web framework. The notification system in Laravel allows you to send notifications to users over different channels. Today, we'll discuss how you can send notifications ov
