QSettings不区分字符串和int值 [英] QSettings does not differentiate between string and int values

问题描述

我使用文件支持的 QSettings 对象编写和读取字符串和int值。
当我以后尝试从不同的进程读取值时，这些值被读取为字符串，而不是int。

I am writing and reading string and int values using a file-backed QSettings object. When I later try to read the values from a different process, the values are read as strings instead of int.

这是我使用的代码写入值：

This is the code I am using to write values:

QSettings settings("TestQSettings.ini", QSettings::IniFormat);
settings.setValue("AAA",QString("111"));
settings.setValue("BBB",222);

这是创建的文件：

This is the file created:

[General]
AAA=111
BBB=222

这是我用来读取值的代码：

This is the code I am using to read values:

QVariant qvar = settings.value("AAA");
std::cout << "AAA type " << qvar.type() << std::endl;
qvar = settings.value("BBB");
std::cout << "BBB type " << qvar.type() << std::endl;

如果我从同一个进程运行这个代码：

If I run this code from the same process:

AAA type 10
BBB type 2

b $ b

如果我从不同的进程运行此代码：

If I run this code from a different process:

AAA type 10
BBB type 10

我知道可以在读取后转换类型。不幸的是，这个解决方案将需要修改Windows旧的跨平台代码，我不喜欢修改，例如多次调用 RegQueryValueEx（）。

I know it's possible to convert the types after they have been read. Unfortunately, this solution will require modifying Windows legacy cross-platform code which I prefer not to modify, for example multiple calls to RegQueryValueEx().

是否可以存储和读取字符串和整数的类型信息？

Is it possible to store and read the type information for strings and integers?

例如，字符串将引用和整数不会：

For example, Strings will have quotes "" and integers will not:

[General]
AAA="111"
BBB=222

这个问题出现在Qt 4和Qt 5，在Linux上。

This problem is present on both Qt 4 and Qt 5, on Linux.

推荐答案

结果很简单。

当值写入INI文件时，类型是已知的。
我在SetValue之前附加到值\STRING

When values are written to the INI file, the type is known. I am appending to the value "\"STRING right before SetValue

当从INI文件读回值时。
我验证字符串类型有上述后缀。
如果他们这样做，我把postfix关闭。
如果他们不假设他们是整数而不是字符串。

When values are read back from the INI file. I verify that string types have the above postfix. If they do, I chop the postfix off. If they don't I assume they are integers instead of strings.

像一个魅力！

感谢所有人，特别是@Kuba Ober实际提供的解决方案。

Thanks to you all and especially @Kuba Ober for practically handing out the solution.

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