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c++ - 在 Linux 上从源代码构建的 Qt5 上找不到 Qt 平台插件 xcb

问题描述

我在 Debian 10 32 位上构建 Qt5。然后我创建了一个最小的 Qt 项目，运行$ ~/qt/qt-everywhere-src-5.12.7/qtbase/bin/qmake project.proand make，但是当我尝试执行应用程序时，我执行以下操作：

这是怎么回事？

$ ./release/project 
qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in ""
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: linuxfb, minimal, offscreen, vnc, webgl.

Aborted

更多信息：

$ QT_DEBUG_PLUGINS=1 release/project 
QFactoryLoader::QFactoryLoader() checking directory path "/home/user/qt/qt-everywhere-src-5.12.7/qtbase/plugins/platforms" ...
QFactoryLoader::QFactoryLoader() looking at "/home/user/qt/qt-everywhere-src-5.12.7/qtbase/plugins/platforms/libqlinuxfb.so"
Found metadata in lib /home/user/qt/qt-everywhere-src-5.12.7/qtbase/plugins/platforms/libqlinuxfb.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "linuxfb"
        ]
    },
    "archreq": 0,
    "className": "QLinuxFbIntegrationPlugin",
    "debug": false,
    "version": 330752
}


Got keys from plugin meta data ("linuxfb")
QFactoryLoader::QFactoryLoader() looking at "/home/user/qt/qt-everywhere-src-5.12.7/qtbase/plugins/platforms/libqminimal.so"
Found metadata in lib /home/user/qt/qt-everywhere-src-5.12.7/qtbase/plugins/platforms/libqminimal.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "minimal"
        ]
    },
    "archreq": 0,
    "className": "QMinimalIntegrationPlugin",
    "debug": false,
    "version": 330752
}


Got keys from plugin meta data ("minimal")
QFactoryLoader::QFactoryLoader() looking at "/home/user/qt/qt-everywhere-src-5.12.7/qtbase/plugins/platforms/libqoffscreen.so"
Found metadata in lib /home/user/qt/qt-everywhere-src-5.12.7/qtbase/plugins/platforms/libqoffscreen.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "offscreen"
        ]
    },
    "archreq": 0,
    "className": "QOffscreenIntegrationPlugin",
    "debug": false,
    "version": 330752
}


Got keys from plugin meta data ("offscreen")
QFactoryLoader::QFactoryLoader() looking at "/home/user/qt/qt-everywhere-src-5.12.7/qtbase/plugins/platforms/libqvnc.so"
Found metadata in lib /home/user/qt/qt-everywhere-src-5.12.7/qtbase/plugins/platforms/libqvnc.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "vnc"
        ]
    },
    "archreq": 0,
    "className": "QVncIntegrationPlugin",
    "debug": false,
    "version": 330752
}


Got keys from plugin meta data ("vnc")
QFactoryLoader::QFactoryLoader() looking at "/home/user/qt/qt-everywhere-src-5.12.7/qtbase/plugins/platforms/libqwebgl.so"
Found metadata in lib /home/user/qt/qt-everywhere-src-5.12.7/qtbase/plugins/platforms/libqwebgl.so, metadata=
{
    "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3",
    "MetaData": {
        "Keys": [
            "webgl"
        ]
    },
    "archreq": 0,
    "className": "QWebGLIntegrationPlugin",
    "debug": false,
    "version": 330752
}


Got keys from plugin meta data ("webgl")
QFactoryLoader::QFactoryLoader() checking directory path "/home/user/QtProjects/project/release/platforms" ...
qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in ""
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: linuxfb, minimal, offscreen, vnc, webgl.

Aborted

标签： c++linuxqtdebianqt5

解决方案

libqxcb.so应该在platforms您的应用程序的子目录中找到。如果您想更改其搜索位置，请查看qt.conf ini 文件，该文件控制插件搜索路径以及其他路径

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