错误 qt.qpa.plugin: Could not find the Qt platform plugin “windows“ in ““ 的解决方法_"qt.qpa.plugin: could not find the qt platform plu_I

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系统环境：

Pipenv 【Python虚拟环境，可选，如需了解可参考： https://blog.csdn.net/weixin_40922744/article/details/103723069 】
PyQt5 5.15.2 【安装方式： pipenv install PyQt5 】
PySide2 5.15.2 【安装方式： pipenv install PySide2 】
PyQt5 和PySide2 二选一安装即可

PySide2 和 PyQt5 的区别:

相同点：两者都是QT与Python结合的桥梁；
不同点：PyQt的开发者是英国的“Riverbank Computing”公司，而PySide则是由Qt的开发公司诺基亚发布的，两者的主要区别主要是提供的授权方式不同：PyQt遵守GPLv3协议，而PySide则是LGPL协议，前者可以免费地用于自由软件的开发，而后者属于闭源商用。更详细资料可参考： PySide2与PyQt5区别

错误描述:

在使用PySide2 或者 PyQt5 的过程中可能会出现以下错误：

根据给出的提示可以看出错误原因是系统找不到Qt平台的插件，解决方法则是将PySide2或者PyQt5的plugins目录加入到QT_QPA_PLATFORM_PLUGIN_PATH环境变量里面。

解决方案:

上面部分已经说了解决思路，具体的实施方式有以下两种：

添加启动代码【简单重复】：

import PySide2
dirname = os.path.dirname(PySide2.__file__) 
plugin_path = os.path.join(dirname, 'plugins', 'platforms')
os.environ['QT_QPA_PLATFORM_PLUGIN_PATH'] = plugin_path

如果是PyQt5则需要修改启动代码为：

import qt5_applications
dirname = os.path.dirname(qt5_applications.__file__)
plugin_path = os.path.join(dirname, 'Qt', 'plugins', 'platforms')
os.environ['QT_QPA_PLATFORM_PLUGIN_PATH'] = plugin_path

在引入各类包的后面插入上述代码：

修改配置文件【一劳永逸】
如果不想每次在代码前添加上述代码，可以修改PySide2的初始化文件"c:\users\XXX.virtualenvs\pyqt5-3bre18dc\lib\site-packages\PySide2_ init _.py" ，在下图位置添加上述代码即可：

对于PyQt5则需要手动添加PyQt的环境变量:

如需快速查找使用pip命令安装的包的位置可以使用 pip show model_name :

在使用PySide2或者PyQt5的过程中，可能会出现“ This application failed to start because it could not find or load the Qt platfor m plugin "windows" in "". ” 或者 “qt.qpa.plugin: Could not find the Qt platform plugin "windows" in ""”错误，下面针对这种错误给出解决方法。如何建立 Qt 从下载 Qt 来源（ qt -everywhere-opensource-src-5.9.5.tar.xz ）并将其解压缩到某个地方。 mkdir /home/nizovn/webos/ qt5 / qt5 .9 tar xvf qt -everywhere-opensource-src-5.9.5.tar.xz -C /home/nizovn/webos/ qt5 / qt5 .9 从下载并解压缩gcc跨工具链（ gcc-linaro-4.8-2015.06-x86_64_arm-linux-gnueabi.tar.xz ）。 tar xvf gcc-linaro-4.8-2015.06-x86_64_arm-linux-gnueabi.tar.xz -C /home/nizovn/webos/ qt5 / qt5 .9 2.在环境变量中添加变量名： QT _ QPA _ PLATFORM _ PLUGIN _PATH 变量值：D:\Anaconda3\Lib\site-packages\PySide2\ plugin s 3.注销重新登录 windows 系统 4.打开相关编译器的cmd win键+s cd /d 你的exe所在目录 windeploy qt xxxxxxx.exe 重新运行即可

Building on: linux-g++ (x86_64, CPU features: mmx sse sse2) Building for: linux-aarch64-gnu-g++ (arm64, CPU features: neon) Target compiler: gcc 6.3.1 Configuration: cross_compile use_gold_linker compile_examples enable_new_dtags largefile neon precompile_header shared rpath release c++11 c++14 concurrent dbus reduce_exports stl Build options: Mode ................................... release Optimize release build for size ........ no Building shared libraries .............. yes Using C standard ....................... C11 Using C++ standard ..................... C++14 Using ccache ........................... no Using gold linker ...................... yes Using new DTAGS ........................ yes Using precompiled headers .............. yes Using LTCG ............................. no Target compiler supports: NEON ................................. yes Build parts ............................ libs Qt modules and options: Qt Concurrent .......................... yes Qt D-Bus ............................... yes Qt D-Bus directly linked to libdbus .... no Qt Gui ................................. yes Qt Network ............................. yes Qt Sql ................................. yes Qt Testlib ............................. yes Qt Widgets ............................. yes Qt Xml ................................. yes Support enabled for: Using pkg-config ....................... yes udev ................................... no Using system zlib ...................... yes Qt Core: DoubleConversion ....................... yes Using system DoubleConversion ........ no GLib ................................... no iconv .................................. yes ICU .................................... no Tracing backend ........................ Logging backends: journald ............................. no syslog ............................... no slog2 ................................ no Using system PCRE2 ..................... no Qt Network: getifaddrs() ........................... yes IPv6 ifname ............................ yes libproxy ............................... no Linux AF_NETLINK ....................... yes OpenSSL ................................ yes Qt directly linked to OpenSSL ........ no OpenSSL 1.1 ............................ no DTLS ................................... yes SCTP ................................... no Use system proxies ..................... yes Qt Gui: Accessibility .......................... yes FreeType ............................... yes Using system FreeType ................ no HarfBuzz ............................... yes Using system HarfBuzz ................ no Fontconfig ............................. no Image formats: GIF .................................. yes ICO .................................. yes JPEG ................................. yes Using system libjpeg ............... yes PNG .................................. yes Using system libpng ................ no EGL .................................... no OpenVG ................................. no OpenGL: Desktop OpenGL ....................... no OpenGL ES 2.0 ........................ no OpenGL ES 3.0 ........................ no OpenGL ES 3.1 ........................ no OpenGL ES 3.2 ........................ no Vulkan ................................. no Session Management ..................... yes Features used by QPA backends: evdev .................................. yes libinput ............................... no INTEGRITY HID .......................... no mtdev .................................. no tslib .................................. no xkbcommon .............................. no X11 specific: XLib ................................. no EGL on X11 ........................... no QPA backends: DirectFB ............................... no EGLFS .................................. no LinuxFB ................................ yes VNC .................................... yes Mir client ............................. no Qt Sql: SQL item models ........................ yes Qt Widgets: GTK+ ................................... no Styles ................................. Fusion Windows Qt PrintSupport: CUPS ................................... no Qt Sql Drivers: DB2 (IBM) .............................. no InterBase .............................. no MySql .................................. no OCI (Oracle) ........................... no ODBC ................................... no PostgreSQL ............................. no SQLite2 ................................ no SQLite ................................. yes Using system provided SQLite ......... no TDS (Sybase) ........................... no Qt Testlib: Tester for item models ................. yes Qt SerialBus: Socket CAN ............................. yes Socket CAN FD .......................... yes Qt QML: QML network support .................... yes QML debugging and profiling support .... yes QML sequence object .................... yes QML list model ......................... yes QML XML http request ................... yes QML Locale ............................. yes QML delegate model ..................... yes Qt Quick: Direct3D 12 ............................ no AnimatedImage item ..................... yes Canvas item ............................ yes Support for Qt Quick Designer .......... yes Flipable item .......................... yes GridView item .......................... yes ListView item .......................... yes TableView item ......................... yes Path support ........................... yes PathView item .......................... yes Positioner items ....................... yes Repeater item .......................... yes ShaderEffect item ...................... yes Sprite item ............................ yes Qt Scxml: ECMAScript data model for Qt Scxml ...... yes Qt Gamepad: SDL2 ................................... no Qt 3D: Assimp ................................. yes System Assimp .......................... no Output Qt 3D Job traces ................. no Output Qt 3D GL traces .................. no Use SSE2 instructions .................. no Use AVX2 instructions .................. no Aspects: Render aspect ........................ yes Input aspect ......................... yes Logic aspect ......................... yes Animation aspect ..................... yes Extras aspect ........................ yes Qt 3D Renderers: OpenGL Renderer ........................ yes Qt 3D GeometryLoaders: Autodesk FBX ........................... no Qt Wayland Client ........................ no Qt Wayland Compositor .................... no Qt Bluetooth: BlueZ .................................. no BlueZ Low Energy ....................... no Linux Crypto API ....................... no WinRT Bluetooth API (desktop & UWP) .... no Qt Sensors: sensorfw ............................... no Qt Quick Controls 2: Styles ................................. Default Fusion Imagine Material Universal Qt Quick Templates 2: Hover support .......................... yes Multi-touch support .................... yes Qt Positioning: Gypsy GPS Daemon ....................... no WinRT Geolocation API .................. no Qt Location: Qt .labs.location experimental QML plugin . yes Geoservice plugin s: OpenStreetMap ........................ yes HERE ................................. yes Esri ................................. yes Mapbox ............................... yes MapboxGL ............................. no Itemsoverlay ......................... yes Qt XmlPatterns: XML schema support ..................... yes Qt Multimedia: ALSA ................................... no GStreamer 1.0 .......................... no GStreamer 0.10 ......................... no Video for Linux ........................ yes OpenAL ................................. no PulseAudio ............................. no Resource Policy (libresource qt5 ) ....... no Windows Audio Services ................. no DirectShow ............................. no Windows Media Foundation ............... no Qt Tools: QDoc ................................... no Qt WebEngine: Embedded build ......................... yes Pepper Plugin s ......................... no Printing and PDF ....................... no Proprietary Codecs ..................... no Spellchecker ........................... yes Native Spellchecker .................... no WebRTC ................................. no Use System Ninja ....................... no Geolocation ............................ yes WebChannel support ..................... yes Use v8 snapshot ........................ yes Kerberos Authentication ................ no Building v8 snapshot supported ......... yes Use ALSA ............................... no Use PulseAudio ......................... no Optional system libraries used: re2 .................................. no icu .................................. no libwebp, libwebpmux and libwebpdemux . no opus ................................. no ffmpeg ............................... no libvpx ............................... no snappy ............................... no glib ................................. no zlib ................................. yes minizip .............................. no libevent ............................. no jsoncpp .............................. no protobuf ............................. no libxml2 and libxslt .................. no lcms2 ................................ no png .................................. no JPEG ................................. no harfbuzz ............................. no freetype ............................. no x11 .................................. no Required system libraries: fontconfig ........................... no dbus ................................. no nss .................................. no khr .................................. no glibc ................................ yes Required system libraries for qpa -xcb: libdrm ............................... no xcomposite ........................... no xcursor .............................. no xi ................................... no xrandr ............................... no xtst ................................. no Note: Also available for Linux: linux-clang linux-icc

在 import Py Qt5 并使用时，出现以下错误： qt . qpa . plugin : Could not find the Qt platform plugin “ windows ” in “” This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem. Py Qt5 == 5.15.4 py qt5 -tools == 5.15.4.3.2 Py Qt5 及py qt5 -tools全部按照教程使用pip 安装（中途报了一个error，将依赖包click从8.*降级至7.0，不过这一步应该没什么影响）出现的问题运行如下实例代码后出现了Could not find the Qt platform plugin python 代码很简短，不像C++等要写几百行代码，但其实你调用的模块，底层都是用C/C++写的如果imshow出现 qt . qpa . plugin : Could not find the Qt platform plugin “cocoa” in “”的报错，请看：Stackoverflow 解决方案请提前安装好opencv- python 库由于历史原因opencv- python 库使用时只能叫cv2 人脸检测效果图 python 完整代码识别静态图片 # 导入opencv- python 库 import cv2 picName = input("请输入你要识别人类的图片名称(如:pi 很抱歉，我不太了解这个问题。很抱歉，我无法理解您的问题。请能够更清楚地表达您的问题，我会尽力帮助您。很抱歉，我无法理解您的问题。这个错误提示意味着程序找不到 Qt 平台插件“ windows ”，它应该在某个地方被定义或者安装在程序的运行路径中。有几种可能的解决方案： 1. 确保你的程序路径中包含了 Qt 平台插件的路径。在 Qt 安装目录下，可以找到一个名为“ platform s”的文件夹，其中包含了各个平台的插件，例如“q windows .dll”文件是用于 Windows 系统的插件。将这些插件文件夹复制到你的程序路径中，或者将它们添加到系统路径中，可能会解决这个问题。 2. 可能是 Qt 版本不兼容或者 Qt 库没有正确安装。检查你的程序使用的 Qt 库版本是否正确，并且在系统中安装了相应版本的 Qt 库。尝试重新安装 Qt 并确保安装路径和环境变量正确配置。 3. 也有可能是 Qt 库没有被正确链接到程序中。检查你的程序链接选项是否正确，并且确保 Qt 库文件在程序的运行路径中。希望这些解决方案可以帮助你解决这个问题。