问题描述
我正在为基于ARM的目标(TI AM335x EVM)的Qt5.2应用程序进行交叉编译，但是它无法在我的平台上显示任何内容.经过一番谷歌搜索，我发现如果我用以下方法启动它:
I was doing some cross compiling of a Qt5.2 application for an ARM based target (TI AM335x EVM) and it was failing to display anything on my platform. After doing some google’ing I found that if I launched it with:
./helloworld -platform eglfs
它会显示出来(全屏，但可以)！
it would show up (full screen, but it worked)!
我开始查看所有平台选项，发现:
I started looking at all the platform options, I found:
我想知道它们的作用.例如，我假设如果我想在Android设备上运行我的应用程序，则必须通过-platform android，但是它们对我来说并不很明显.
I’m wondering what they are for. I assume, for example, that if I wanted to run my application on an Android device I’d have to pass -platform android, but they’re not all obvious to me.
何时应该使用这些参数中的每个参数?
Is there a listing anywhere of when each of these parameters should be used?
例如，eglfs代表什么?为什么我需要在linuxfb无法正常工作的地方使用它?
(我本以为linux帧缓冲区是我的应用程序的运行方式，因为它运行在嵌入式linux上)
For example, what does eglfs stand for? And why did I need to use that where as linuxfb didn’t work?
(I would have thought the linux frame buffer was how I wanted to launch my application since it was running on embedded linux)
推荐答案
如果linuxfb插件不起作用，则可能是您未在系统上正确配置帧缓冲设备.也许Directf层已经在运行，所以您可能想尝试使用directfb插件.
If the linuxfb plugin doesn't work, then possibly you didn't correctly configure the framebuffer device on your system. Maybe a directf layer is already running, so you may want to try the directfb plugin instead.
如果希望避免在运行可执行文件时指定平台选项，则可以在构建Qt时将默认选项传递给configure.
If you wish to avoid having to specify the platform option when you run the executable, you can pass the default one to configure when you build Qt.
插件可以描述如下:
-
Linux插件-使用Linux特定的输入设备和各种输出设备的
Linux plugins - those use Linux-specific input devices and various output devices
-
eglfs-在全屏模式下使用OpenGL ES.没有其他方法，因为OpenGL没有窗口管理器的概念.
eglfs - Uses the OpenGL ES in fullscreen mode. There's no other way since OpenGL has no concept of a window manager.
directfb(不是directfp)-通过 directfb 层将Linux帧缓冲区与OpenGL ES一起使用.集成到directfb窗口中.
directfb (not directfp) - Uses the linux frame buffer with OpenGL ES via the directfb layer. Integrates into the directfb windowing.
linuxfb-在全屏模式下使用linux帧缓冲区.没有其他方法，因为linuxfb没有窗口管理器的概念.
linuxfb - Uses the linux frame buffer in fullscreen mode. There's no other way since linuxfb has no concept of a window manager.
kms-在全屏模式下使用linux内核模式设置API.没有其他方法，因为DRM没有窗口管理器的概念.
kms - Uses linux kernel modesetting API in fullscreen mode. There's no other way since DRM has no concept of a window manager.
openwfd-在全屏模式下使用 openwfd Wifi显示.由于openwfd没有窗口管理器的概念，因此没有其他方法.
openwfd - Uses an openwfd Wifi display in fullscreen mode. There's no other way since openwfd has no concept of a window manager.
与平台无关的插件-可以在任何操作系统上运行
Platform-independent plugins - could be made to run on any OS
-
xcb-在X11服务器上运行，并集成到X11窗口环境中.通常，如果没有窗口管理器也无法正常运行.如果您想将应用程序从Windows服务器提供给X11瘦终端(通常是Unix机顶盒)，则可以在Windows上(在xlib的Windows实现下)运行.
xcb - Runs on an X11 server and is integrated into the X11 windowing environment. Generally it won't behave correctly without a window manager running as well. Can be made to work on Windows, given a Windows implementation of xlib, if you want to, say, serve applications from a Windows server to X11 thin terminals (typically Unix boxes).
屏幕外-渲染到屏幕外缓冲区.对于渲染到自定义显示很有用.
offscreen - Renders to an offscreen buffer. Useful for rendering to custom displays.
minimal-最小的后备存储，可以选择将虚拟屏幕转储到文件中.实现最低限度的功能只是为了演示如何开始编写平台插件.
minimal - A minimalistic backing store that optionally dumps the virtual screen to a file. Implements the bare minimum of functionality just to demonstrate how to start writing a platform plugin.
其他特定于平台的插件
-
android-使用Android API，并集成到Android环境中.
android - Uses the Android APIs and is integrated into the Android environment.
windows-使用WINAPI，并集成到Windows窗口环境中.
windows - Uses the WINAPI and is integrated into the Windows windowing environment.
可可-使用可可API，并集成到OS X窗口环境中.
cocoa - Uses the Cocoa APIs and is integrated into the OS X windowing environment.
iOS-使用iOS工具包，并集成到iOS环境中.
iOS - Uses the iOS toolkits and is integrated into the iOS environment.
qnx-使用QNX API，并集成到QNX光子窗口环境中.
qnx - Uses the QNX APIs and is integrated into the QNX photon windowing environment.
这篇关于各种Qt平台插件有什么用?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！