C++ 是否可以为Qt中的每种语言编译单独的应用程序？

所以我为

N

语言创建了翻译（使用Qt语言学家）。我想将我的应用程序编译成不同前缀的

N

应用程序，比如

\u en\u US

或

\u fr\u fr

嵌入到每个翻译字符串中。此外，我想保留一个版本的应用程序，将自动确定当前的平台语言有所有的翻译版本内。如何更改我的

.pro

文件以获得这样的结果？

我认为嵌入所有翻译并在运行时做出决定要容易得多 要加载哪一个。也许您可以提供一个命令行开关或一个选项来 重写系统区域设置。您甚至不必将它们嵌入到可执行文件中， 您可以在“翻译”目录中发送它们。在运行时获取系统语言环境 您可以使用类：

无论如何，如果你真的想按自己的方式做，你可以依靠环境变量

LANGUAGE\u ID

来检测什么语言 嵌入到构建中，然后为每个可用的 语言。这可能要花很多时间，但也许你只能在最短的时间内完成 最终版本

以下是一个例子：

#include <iostream>

int main(int argc, char *argv[])
{
#ifdef EMBED_ONLY_ONE_LANGUAGE
    std::cout << "Embedded language is " << LANGUAGE_ID << std::endl;
#elif EMBED_ALL_LANGUAGES
    std::cout << "Embedded all languages" << std::endl;
#else
    std::cout << "What???" << std::endl;
#endif
}

它利用了未记录的数据。请注意，如果 更改环境变量

LANGUAGE\u ID

的值必须运行qmake 再次（可能是在删除makefile之后）

一个（也许更好）的替代方法是使用CMake并将语言id指定为 CMake的命令行变量：

cmake_minimum_required(VERSION 2.6)
project(SomeName)

set(SOURCES main.cpp)

add_executable(SomeName ${SOURCES})

if(${LANGUAGE_ID} MATCHES "[a-z][a-z]_[A-Z][A-Z]")
    # A language id was specified. Add the build instructions to embed only
    # the relative translation.
    message("Embedding language ${LANGUAGE_ID}")

    # This adds a preprocessor variable LANGUAGE_ID whose value is the language.
    add_definitions("-DLANGUAGE_ID=\"${LANGUAGE_ID}\"")

    # This adds a preprocessor variable so that the program knows that it has
    # only one language.
    add_definitions("-DEMBED_ONLY_ONE_LANGUAGE")

    # This renames the executable.
    set_target_properties(SomeName PROPERTIES OUTPUT_NAME "SomeName_${LANGUAGE_ID}")

else(${LANGUAGE_ID} MATCHES "[a-z][a-z]_[A-Z][A-Z]")
    # No language id specified. Add the build instructions to embed all the
    # translations and to decide at runtime which one to load.
    message("Not embedding any language")

    # This adds a preprocessor variable so that the program knows that it has
    # every language.
    add_definitions("-DEMBED_ALL_LANGUAGES")

endif(${LANGUAGE_ID} MATCHES "[a-z][a-z]_[A-Z][A-Z]")

---

Qt的翻译机制的要点是，你不需要严格按照你的要求去做。@Styne，我想OP知道这一点。为什么不试着回答给出的问题呢？@TonyK，因为这种问题高呼“糟糕的设计”。一个明智的解决方案是让用户明白如何更改语言，然后使用Qt的内置机制。这才更有意义。

TEMPLATE = app
DEPENDPATH += .
INCLUDEPATH += .
TARGET = SomeName

CONFIG -= qt
CONFIG += console

# Input
SOURCES += main.cpp

# It seems that "equals" does not work with environment variables so we
# first read it in a local variable.
LANGUAGE_ID=$$(LANGUAGE_ID)

equals(LANGUAGE_ID,) {
    # No language id specified. Add the build instructions to embed all the
    # translations and to decide at runtime which one to load.
    message(No language id specified)

    # This adds a preprocessor variable so that the program knows that it has
    # every language.
    DEFINES *= EMBED_ALL_LANGUAGES
} else {
    # A language id was specified. Add the build instructions to embed only
    # the relative translation.
    message(Specified language id: $$LANGUAGE_ID)

    # This adds a preprocessor variable LANGUAGE_ID whose value is the language.
    DEFINES *= LANGUAGE_ID=\\\"$$LANGUAGE_ID\\\"

    # This adds a preprocessor variable so that the program knows that it has
    # only one language.
    DEFINES *= EMBED_ONLY_ONE_LANGUAGE

    # This renames the executable.
    TARGET=$${TARGET}_$$(LANGUAGE_ID)
}

cmake_minimum_required(VERSION 2.6)
project(SomeName)

set(SOURCES main.cpp)

add_executable(SomeName ${SOURCES})

if(${LANGUAGE_ID} MATCHES "[a-z][a-z]_[A-Z][A-Z]")
    # A language id was specified. Add the build instructions to embed only
    # the relative translation.
    message("Embedding language ${LANGUAGE_ID}")

    # This adds a preprocessor variable LANGUAGE_ID whose value is the language.
    add_definitions("-DLANGUAGE_ID=\"${LANGUAGE_ID}\"")

    # This adds a preprocessor variable so that the program knows that it has
    # only one language.
    add_definitions("-DEMBED_ONLY_ONE_LANGUAGE")

    # This renames the executable.
    set_target_properties(SomeName PROPERTIES OUTPUT_NAME "SomeName_${LANGUAGE_ID}")

else(${LANGUAGE_ID} MATCHES "[a-z][a-z]_[A-Z][A-Z]")
    # No language id specified. Add the build instructions to embed all the
    # translations and to decide at runtime which one to load.
    message("Not embedding any language")

    # This adds a preprocessor variable so that the program knows that it has
    # every language.
    add_definitions("-DEMBED_ALL_LANGUAGES")

endif(${LANGUAGE_ID} MATCHES "[a-z][a-z]_[A-Z][A-Z]")