使用 qt.conf

可以使用 qt.conf 文件以覆盖路径或指定要传递给平台插件的自变量。

格式和定位

The qt.conf 文件是 INI 文本文件，作为描述在 QSettings 文档编制。

QLibraryInfo 将加载 qt.conf 从以下位置之一：

1. :/qt/etc/qt.conf 使用资源系统
2. on macOS, in the Resource directory inside the application bundle, for example assistant.app/Contents/Resources/qt.conf
3. in the directory containing the application executable, i.e. QCoreApplication::applicationDirPath () + QDir::separator () + "qt.conf"

覆写路径

The qt.conf file can be used to override the hard-coded paths that are compiled into the Qt library. These paths are accessible using the QLibraryInfo class. Without qt.conf , the functions in QLibraryInfo return these hard-coded paths; otherwise they return the paths as specified in qt.conf .

Without qt.conf , the Qt libraries will use the hard-coded paths to look for plugins, translations, and so on. These paths may not exist on the target system, or they may not be accessible. Because of this, you may need qt.conf to make the Qt libraries look elsewhere.

The file should have a Paths group which contains the entries that correspond to each value of the QLibraryInfo::LibraryLocation enum. See the QLibraryInfo documentation for details on the meaning of the various locations.

Entry	默认值
前缀	QCoreApplication::applicationDirPath ()
文档编制	doc
头	包括
库	lib
LibraryExecutables	libexec on Unix, bin 在 Windows
Binaries	bin
插件	plugins
QmlImports	qml
ArchData	.
数据	.
翻译	translations
范例	examples
测试	tests
设置	.

Absolute paths are used as specified in the qt.conf file. All paths are relative to the 前缀 . On Windows and X11, the 前缀 is relative to the directory containing the application executable ( QCoreApplication::applicationDirPath ()). On macOS, the 前缀 is relative to the 内容 in the application bundle. For example, application.app/Contents/plugins/ is the default location for loading Qt plugins. Note that the plugins need to be placed in specific sub-directories under the plugins directory (see 如何创建 Qt 插件 了解细节)。

注意： For backwards-compatibility, the entry Qml2Imports is valid in the Paths section and is treated as fallback for QmlImports .

For example, a qt.conf file could contain the following:

[Paths]
Prefix = /some/path
Translations = i18n
					

注意： The backslash character is treated as a special character in INI files (see QSettings ). It is therefore recommended to use forward slashes for paths on Windows as well. Otherwise, an escape character is required:

Prefix = c:\\SomePath
					

配置平台插件自变量

The qt.conf 可能包含 平台 group, whose keys are comma-delimited lists of arguments to be passed to the platform plugin. The key name is the name of the platform plugin with the first letter upper-cased followed by 自变量 .

例如：

[Platforms]
WindowsArguments = fontengine=freetype
					

would cause the Windows platform plugin to use the FreeType font engine.

如何处理旧版 Qt 的并行安装

For environments that require an installation of an earlier major version of Qt as well, it is possible to use a version-specific qt.conf. This is often necessary in transition phases from one Qt version to the next, or to avoid conflicts caused by an existing file without version.

For this purpose, a file named qt6.conf can be used instead of the qt.conf file. If both files exist in the directory described above, qt6.conf 被使用。

内容

• 格式和定位

• 覆写路径

• 配置平台插件自变量

• 如何处理旧版 Qt 的并行安装